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Apache Commons DBCP software implements Database Connection Pooling
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.dbcp2;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.lang.management.ManagementFactory;
import java.nio.charset.StandardCharsets;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Properties;
import java.util.logging.Logger;
import javax.management.InstanceAlreadyExistsException;
import javax.management.JMException;
import javax.management.MBeanRegistration;
import javax.management.MBeanRegistrationException;
import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.NotCompliantMBeanException;
import javax.management.ObjectName;
import javax.sql.DataSource;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.pool2.PooledObject;
import org.apache.commons.pool2.impl.AbandonedConfig;
import org.apache.commons.pool2.impl.BaseObjectPoolConfig;
import org.apache.commons.pool2.impl.GenericKeyedObjectPoolConfig;
import org.apache.commons.pool2.impl.GenericObjectPool;
import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
/**
* Basic implementation of javax.sql.DataSource that is
* configured via JavaBeans properties. This is not the only way to
* combine the commons-dbcp and commons-pool packages,
* but provides a "one stop shopping" solution for basic requirements.
*
* @author Glenn L. Nielsen
* @author Craig R. McClanahan
* @author Dirk Verbeeck
* @version $Revision: 1572244 $ $Date: 2014-02-26 20:38:08 +0000 (Wed, 26 Feb 2014) $
* @since 2.0
*/
public class BasicDataSource implements DataSource, BasicDataSourceMXBean, MBeanRegistration {
private static final Log log = LogFactory.getLog(BasicDataSource.class);
static {
// Attempt to prevent deadlocks - see DBCP - 272
DriverManager.getDrivers();
try {
// Load classes now to prevent AccessControlExceptions later
// A number of classes are loaded when getConnection() is called
// but the following classes are not loaded and therefore require
// explicit loading.
if (Utils.IS_SECURITY_ENABLED) {
ClassLoader loader = BasicDataSource.class.getClassLoader();
String dbcpPackageName = BasicDataSource.class.getPackage().getName();
loader.loadClass(dbcpPackageName + ".BasicDataSource$PaGetConnection");
loader.loadClass(dbcpPackageName + ".DelegatingCallableStatement");
loader.loadClass(dbcpPackageName + ".DelegatingDatabaseMetaData");
loader.loadClass(dbcpPackageName + ".DelegatingPreparedStatement");
loader.loadClass(dbcpPackageName + ".DelegatingResultSet");
loader.loadClass(dbcpPackageName + ".PoolableCallableStatement");
loader.loadClass(dbcpPackageName + ".PoolablePreparedStatement");
loader.loadClass(dbcpPackageName + ".PoolingConnection$StatementType");
loader.loadClass(dbcpPackageName + ".PStmtKey");
String poolPackageName = PooledObject.class.getPackage().getName();
loader.loadClass(poolPackageName + ".impl.LinkedBlockingDeque$Node");
loader.loadClass(poolPackageName + ".impl.GenericKeyedObjectPool$ObjectDeque");
}
} catch (ClassNotFoundException cnfe) {
throw new IllegalStateException("Unable to pre-load classes", cnfe);
}
}
// ------------------------------------------------------------- Properties
/**
* The default auto-commit state of connections created by this pool.
*/
private volatile Boolean defaultAutoCommit = null;
/**
* Returns the default auto-commit property.
*
* @return true if default auto-commit is enabled
*/
@Override
public Boolean getDefaultAutoCommit() {
return defaultAutoCommit;
}
/**
* Sets default auto-commit state of connections returned by this
* datasource.
*
* Note: this method currently has no effect once the pool has been
* initialized. The pool is initialized the first time one of the
* following methods is invoked: getConnection, setLogwriter,
* setLoginTimeout, getLoginTimeout, getLogWriter.
*
* @param defaultAutoCommit default auto-commit value
*/
public void setDefaultAutoCommit(Boolean defaultAutoCommit) {
this.defaultAutoCommit = defaultAutoCommit;
}
/**
* The default read-only state of connections created by this pool.
*/
private transient Boolean defaultReadOnly = null;
/**
* Returns the default readOnly property.
*
* @return true if connections are readOnly by default
*/
@Override
public Boolean getDefaultReadOnly() {
return defaultReadOnly;
}
/**
* Sets defaultReadonly property.
*
* Note: this method currently has no effect once the pool has been
* initialized. The pool is initialized the first time one of the
* following methods is invoked: getConnection, setLogwriter,
* setLoginTimeout, getLoginTimeout, getLogWriter.
*
* @param defaultReadOnly default read-only value
*/
public void setDefaultReadOnly(Boolean defaultReadOnly) {
this.defaultReadOnly = defaultReadOnly;
}
/**
* The default TransactionIsolation state of connections created by this pool.
*/
private volatile int defaultTransactionIsolation =
PoolableConnectionFactory.UNKNOWN_TRANSACTIONISOLATION;
/**
* Returns the default transaction isolation state of returned connections.
*
* @return the default value for transaction isolation state
* @see Connection#getTransactionIsolation
*/
@Override
public int getDefaultTransactionIsolation() {
return this.defaultTransactionIsolation;
}
/**
* Sets the default transaction isolation state for returned
* connections.
*
* Note: this method currently has no effect once the pool has been
* initialized. The pool is initialized the first time one of the
* following methods is invoked: getConnection, setLogwriter,
* setLoginTimeout, getLoginTimeout, getLogWriter.
*
* @param defaultTransactionIsolation the default transaction isolation
* state
* @see Connection#getTransactionIsolation
*/
public void setDefaultTransactionIsolation(int defaultTransactionIsolation) {
this.defaultTransactionIsolation = defaultTransactionIsolation;
}
private Integer defaultQueryTimeout = null;
/**
* Obtain the default query timeout that will be used for {@link java.sql.Statement Statement}s
* created from this connection. null means that the driver
* default will be used.
*/
public Integer getDefaultQueryTimeout() {
return defaultQueryTimeout;
}
/**
* Set the default query timeout that will be used for {@link java.sql.Statement Statement}s
* created from this connection. null means that the driver
* default will be used.
*/
public void setDefaultQueryTimeout(Integer defaultQueryTimeout) {
this.defaultQueryTimeout = defaultQueryTimeout;
}
/**
* The default "catalog" of connections created by this pool.
*/
private volatile String defaultCatalog = null;
/**
* Returns the default catalog.
*
* @return the default catalog
*/
@Override
public String getDefaultCatalog() {
return this.defaultCatalog;
}
/**
* Sets the default catalog.
*
* Note: this method currently has no effect once the pool has been
* initialized. The pool is initialized the first time one of the
* following methods is invoked: getConnection, setLogwriter,
* setLoginTimeout, getLoginTimeout, getLogWriter.
*
* @param defaultCatalog the default catalog
*/
public void setDefaultCatalog(String defaultCatalog) {
if (defaultCatalog != null && defaultCatalog.trim().length() > 0) {
this.defaultCatalog = defaultCatalog;
}
else {
this.defaultCatalog = null;
}
}
/**
* The property that controls if the pooled connections cache some state
* rather than query the database for current state to improve performance.
*/
private boolean cacheState = true;
/**
* Returns the state caching flag.
*
* @return the state caching flag
*/
@Override
public boolean getCacheState() {
return cacheState;
}
/**
* Sets the state caching flag.
*
* @param cacheState The new value for the state caching flag
*/
public void setCacheState(boolean cacheState) {
this.cacheState = cacheState;
}
/**
* The instance of the JDBC Driver to use.
*/
private Driver driver = null;
/**
* Returns the JDBC Driver that has been configured for use by this pool.
*
* Note: This getter only returns the last value set by a call to
* {@link #setDriver(Driver)}. It does not return any driver instance that
* may have been created from the value set via
* {@link #setDriverClassName(String)}.
*
* @return the JDBC Driver that has been configured for use by this pool
*/
public synchronized Driver getDriver() {
return driver;
}
/**
* Sets the JDBC Driver instance to use for this pool.
*
* Note: this method currently has no effect once the pool has been
* initialized. The pool is initialized the first time one of the
* following methods is invoked: getConnection, setLogwriter,
* setLoginTimeout, getLoginTimeout, getLogWriter.
*
* @param driver
*/
public synchronized void setDriver(Driver driver) {
this.driver = driver;
}
/**
* The fully qualified Java class name of the JDBC driver to be used.
*/
private String driverClassName = null;
/**
* Returns the jdbc driver class name.
*
* Note: This getter only returns the last value set by a call to
* {@link #setDriverClassName(String)}. It does not return the class name of
* any driver that may have been set via {@link #setDriver(Driver)}.
*
* @return the jdbc driver class name
*/
@Override
public synchronized String getDriverClassName() {
return this.driverClassName;
}
/**
*
Sets the jdbc driver class name.
*
* Note: this method currently has no effect once the pool has been
* initialized. The pool is initialized the first time one of the
* following methods is invoked: getConnection, setLogwriter,
* setLoginTimeout, getLoginTimeout, getLogWriter.
*
* @param driverClassName the class name of the jdbc driver
*/
public synchronized void setDriverClassName(String driverClassName) {
if (driverClassName != null && driverClassName.trim().length() > 0) {
this.driverClassName = driverClassName;
}
else {
this.driverClassName = null;
}
}
/**
* The class loader instance to use to load the JDBC driver. If not
* specified, {@link Class#forName(String)} is used to load the JDBC driver.
* If specified, {@link Class#forName(String, boolean, ClassLoader)} is
* used.
*/
private ClassLoader driverClassLoader = null;
/**
* Returns the class loader specified for loading the JDBC driver. Returns
* null if no class loader has been explicitly specified.
*
* Note: This getter only returns the last value set by a call to
* {@link #setDriverClassLoader(ClassLoader)}. It does not return the class
* loader of any driver that may have been set via
* {@link #setDriver(Driver)}.
*/
public synchronized ClassLoader getDriverClassLoader() {
return this.driverClassLoader;
}
/**
*
Sets the class loader to be used to load the JDBC driver.
*
* Note: this method currently has no effect once the pool has been
* initialized. The pool is initialized the first time one of the
* following methods is invoked: getConnection, setLogwriter,
* setLoginTimeout, getLoginTimeout, getLogWriter.
*
* @param driverClassLoader the class loader with which to load the JDBC
* driver
*/
public synchronized void setDriverClassLoader(
ClassLoader driverClassLoader) {
this.driverClassLoader = driverClassLoader;
}
/**
* True means that borrowObject returns the most recently used ("last in")
* connection in the pool (if there are idle connections available). False
* means that the pool behaves as a FIFO queue - connections are taken from
* the idle instance pool in the order that they are returned to the pool.
*/
private boolean lifo = BaseObjectPoolConfig.DEFAULT_LIFO;
/**
* Returns the LIFO property.
*
* @return true if connection pool behaves as a LIFO queue.
*/
@Override
public synchronized boolean getLifo() {
return this.lifo;
}
/**
* Sets the LIFO property. True means the pool behaves as a LIFO queue;
* false means FIFO.
*
* @param lifo the new value for the LIFO property
*
*/
public synchronized void setLifo(boolean lifo) {
this.lifo = lifo;
if (connectionPool != null) {
connectionPool.setLifo(lifo);
}
}
/**
* The maximum number of active connections that can be allocated from
* this pool at the same time, or negative for no limit.
*/
private int maxTotal = GenericObjectPoolConfig.DEFAULT_MAX_TOTAL;
/**
* Returns the maximum number of active connections that can be
* allocated at the same time.
*
* A negative number means that there is no limit.
*
* @return the maximum number of active connections
*/
@Override
public synchronized int getMaxTotal() {
return this.maxTotal;
}
/**
* Sets the maximum total number of idle and borrows connections that can be
* active at the same time. Use a negative value for no limit.
*
* @param maxTotal the new value for maxTotal
* @see #getMaxTotal()
*/
public synchronized void setMaxTotal(int maxTotal) {
this.maxTotal = maxTotal;
if (connectionPool != null) {
connectionPool.setMaxTotal(maxTotal);
}
}
/**
* The maximum number of connections that can remain idle in the
* pool, without extra ones being destroyed, or negative for no limit.
* If maxIdle is set too low on heavily loaded systems it is possible you
* will see connections being closed and almost immediately new connections
* being opened. This is a result of the active threads momentarily closing
* connections faster than they are opening them, causing the number of idle
* connections to rise above maxIdle. The best value for maxIdle for heavily
* loaded system will vary but the default is a good starting point.
*/
private int maxIdle = GenericObjectPoolConfig.DEFAULT_MAX_IDLE;
/**
* Returns the maximum number of connections that can remain idle in the
* pool. Excess idle connections are destroyed on return to the pool.
*
* A negative value indicates that there is no limit
*
* @return the maximum number of idle connections
*/
@Override
public synchronized int getMaxIdle() {
return this.maxIdle;
}
/**
* Sets the maximum number of connections that can remain idle in the
* pool. Excess idle connections are destroyed on return to the pool.
*
* @see #getMaxIdle()
* @param maxIdle the new value for maxIdle
*/
public synchronized void setMaxIdle(int maxIdle) {
this.maxIdle = maxIdle;
if (connectionPool != null) {
connectionPool.setMaxIdle(maxIdle);
}
}
/**
* The minimum number of active connections that can remain idle in the
* pool, without extra ones being created when the evictor runs, or 0 to create none.
* The pool attempts to ensure that minIdle connections are available when the idle object evictor
* runs. The value of this property has no effect unless {@link #timeBetweenEvictionRunsMillis}
* has a positive value.
*/
private int minIdle = GenericObjectPoolConfig.DEFAULT_MIN_IDLE;
/**
* Returns the minimum number of idle connections in the pool. The pool attempts
* to ensure that minIdle connections are available when the idle object evictor
* runs. The value of this property has no effect unless {@link #timeBetweenEvictionRunsMillis}
* has a positive value.
*
* @return the minimum number of idle connections
* @see GenericObjectPool#getMinIdle()
*/
@Override
public synchronized int getMinIdle() {
return this.minIdle;
}
/**
* Sets the minimum number of idle connections in the pool. The pool attempts
* to ensure that minIdle connections are available when the idle object evictor
* runs. The value of this property has no effect unless {@link #timeBetweenEvictionRunsMillis}
* has a positive value.
*
* @param minIdle the new value for minIdle
* @see GenericObjectPool#setMinIdle(int)
*/
public synchronized void setMinIdle(int minIdle) {
this.minIdle = minIdle;
if (connectionPool != null) {
connectionPool.setMinIdle(minIdle);
}
}
/**
* The initial number of connections that are created when the pool
* is started.
*/
private int initialSize = 0;
/**
* Returns the initial size of the connection pool.
*
* @return the number of connections created when the pool is initialized
*/
@Override
public synchronized int getInitialSize() {
return this.initialSize;
}
/**
* Sets the initial size of the connection pool.
*
* Note: this method currently has no effect once the pool has been
* initialized. The pool is initialized the first time one of the
* following methods is invoked: getConnection, setLogwriter,
* setLoginTimeout, getLoginTimeout, getLogWriter.
*
* @param initialSize the number of connections created when the pool
* is initialized
*/
public synchronized void setInitialSize(int initialSize) {
this.initialSize = initialSize;
}
/**
* The maximum number of milliseconds that the pool will wait (when there
* are no available connections) for a connection to be returned before
* throwing an exception, or <= 0 to wait indefinitely.
*/
private long maxWaitMillis =
BaseObjectPoolConfig.DEFAULT_MAX_WAIT_MILLIS;
/**
* Returns the maximum number of milliseconds that the pool will wait
* for a connection to be returned before throwing an exception. A value
* less than or equal to zero means the pool is set to wait indefinitely.
*
* @return the maxWaitMillis property value
*/
@Override
public synchronized long getMaxWaitMillis() {
return this.maxWaitMillis;
}
/**
* Sets the MaxWaitMillis property. Use -1 to make the pool wait
* indefinitely.
*
* @param maxWaitMillis the new value for MaxWaitMillis
* @see #getMaxWaitMillis()
*/
public synchronized void setMaxWaitMillis(long maxWaitMillis) {
this.maxWaitMillis = maxWaitMillis;
if (connectionPool != null) {
connectionPool.setMaxWaitMillis(maxWaitMillis);
}
}
/**
* Prepared statement pooling for this pool. When this property is set to true
* both PreparedStatements and CallableStatements are pooled.
*/
private boolean poolPreparedStatements = false;
/**
* Returns true if we are pooling statements.
*
* @return true if prepared and callable statements are pooled
*/
@Override
public synchronized boolean isPoolPreparedStatements() {
return this.poolPreparedStatements;
}
/**
* Sets whether to pool statements or not.
*
* Note: this method currently has no effect once the pool has been
* initialized. The pool is initialized the first time one of the
* following methods is invoked: getConnection, setLogwriter,
* setLoginTimeout, getLoginTimeout, getLogWriter.
*
* @param poolingStatements pooling on or off
*/
public synchronized void setPoolPreparedStatements(boolean poolingStatements) {
this.poolPreparedStatements = poolingStatements;
}
/**
* The maximum number of open statements that can be allocated from
* the statement pool at the same time, or negative for no limit. Since
* a connection usually only uses one or two statements at a time, this is
* mostly used to help detect resource leaks.
*
* Note: As of version 1.3, CallableStatements (those produced by {@link Connection#prepareCall})
* are pooled along with PreparedStatements (produced by {@link Connection#prepareStatement})
* and maxOpenPreparedStatements limits the total number of prepared or callable statements
* that may be in use at a given time.
*/
private int maxOpenPreparedStatements =
GenericKeyedObjectPoolConfig.DEFAULT_MAX_TOTAL;
/**
* Gets the value of the maxOpenPreparedStatements property.
*
* @return the maximum number of open statements
*/
@Override
public synchronized int getMaxOpenPreparedStatements() {
return this.maxOpenPreparedStatements;
}
/**
* Sets the value of the maxOpenPreparedStatements
* property.
*
* Note: this method currently has no effect once the pool has been
* initialized. The pool is initialized the first time one of the
* following methods is invoked: getConnection, setLogwriter,
* setLoginTimeout, getLoginTimeout, getLogWriter.
*
* @param maxOpenStatements the new maximum number of prepared statements
*/
public synchronized void setMaxOpenPreparedStatements(int maxOpenStatements) {
this.maxOpenPreparedStatements = maxOpenStatements;
}
/**
* The indication of whether objects will be validated as soon as they have
* been created by the pool. If the object fails to validate, the borrow
* operation that triggered the creation will fail.
*/
private boolean testOnCreate = false;
/**
* Returns the {@link #testOnCreate} property.
*
* @return true if objects are validated immediately after they are created
* by the pool
*
* @see #testOnCreate
*/
@Override
public synchronized boolean getTestOnCreate() {
return this.testOnCreate;
}
/**
* Sets the {@link #testOnCreate} property. This property determines
* whether or not the pool will validate objects immediately after they are
* created by the pool
*
* @param testOnCreate new value for testOnCreate property
*/
public synchronized void setTestOnCreate(boolean testOnCreate) {
this.testOnCreate = testOnCreate;
if (connectionPool != null) {
connectionPool.setTestOnCreate(testOnCreate);
}
}
/**
* The indication of whether objects will be validated before being
* borrowed from the pool. If the object fails to validate, it will be
* dropped from the pool, and we will attempt to borrow another.
*/
private boolean testOnBorrow = true;
/**
* Returns the {@link #testOnBorrow} property.
*
* @return true if objects are validated before being borrowed from the
* pool
*
* @see #testOnBorrow
*/
@Override
public synchronized boolean getTestOnBorrow() {
return this.testOnBorrow;
}
/**
* Sets the {@link #testOnBorrow} property. This property determines
* whether or not the pool will validate objects before they are borrowed
* from the pool.
*
* @param testOnBorrow new value for testOnBorrow property
*/
public synchronized void setTestOnBorrow(boolean testOnBorrow) {
this.testOnBorrow = testOnBorrow;
if (connectionPool != null) {
connectionPool.setTestOnBorrow(testOnBorrow);
}
}
/**
* The indication of whether objects will be validated before being
* returned to the pool.
*/
private boolean testOnReturn = false;
/**
* Returns the value of the {@link #testOnReturn} property.
*
* @return true if objects are validated before being returned to the
* pool
* @see #testOnReturn
*/
public synchronized boolean getTestOnReturn() {
return this.testOnReturn;
}
/**
* Sets the testOnReturn property. This property determines
* whether or not the pool will validate objects before they are returned
* to the pool.
*
* @param testOnReturn new value for testOnReturn property
*/
public synchronized void setTestOnReturn(boolean testOnReturn) {
this.testOnReturn = testOnReturn;
if (connectionPool != null) {
connectionPool.setTestOnReturn(testOnReturn);
}
}
/**
* The number of milliseconds to sleep between runs of the idle object
* evictor thread. When non-positive, no idle object evictor thread will
* be run.
*/
private long timeBetweenEvictionRunsMillis =
BaseObjectPoolConfig.DEFAULT_TIME_BETWEEN_EVICTION_RUNS_MILLIS;
/**
* Returns the value of the {@link #timeBetweenEvictionRunsMillis}
* property.
*
* @return the time (in milliseconds) between evictor runs
* @see #timeBetweenEvictionRunsMillis
*/
@Override
public synchronized long getTimeBetweenEvictionRunsMillis() {
return this.timeBetweenEvictionRunsMillis;
}
/**
* Sets the {@link #timeBetweenEvictionRunsMillis} property.
*
* @param timeBetweenEvictionRunsMillis the new time between evictor runs
* @see #timeBetweenEvictionRunsMillis
*/
public synchronized void setTimeBetweenEvictionRunsMillis(long timeBetweenEvictionRunsMillis) {
this.timeBetweenEvictionRunsMillis = timeBetweenEvictionRunsMillis;
if (connectionPool != null) {
connectionPool.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
}
}
/**
* The number of objects to examine during each run of the idle object
* evictor thread (if any).
*/
private int numTestsPerEvictionRun =
BaseObjectPoolConfig.DEFAULT_NUM_TESTS_PER_EVICTION_RUN;
/**
* Returns the value of the {@link #numTestsPerEvictionRun} property.
*
* @return the number of objects to examine during idle object evictor
* runs
* @see #numTestsPerEvictionRun
*/
@Override
public synchronized int getNumTestsPerEvictionRun() {
return this.numTestsPerEvictionRun;
}
/**
* Sets the value of the {@link #numTestsPerEvictionRun} property.
*
* @param numTestsPerEvictionRun the new {@link #numTestsPerEvictionRun}
* value
* @see #numTestsPerEvictionRun
*/
public synchronized void setNumTestsPerEvictionRun(int numTestsPerEvictionRun) {
this.numTestsPerEvictionRun = numTestsPerEvictionRun;
if (connectionPool != null) {
connectionPool.setNumTestsPerEvictionRun(numTestsPerEvictionRun);
}
}
/**
* The minimum amount of time an object may sit idle in the pool before it
* is eligible for eviction by the idle object evictor (if any).
*/
private long minEvictableIdleTimeMillis =
BaseObjectPoolConfig.DEFAULT_MIN_EVICTABLE_IDLE_TIME_MILLIS;
/**
* Returns the {@link #minEvictableIdleTimeMillis} property.
*
* @return the value of the {@link #minEvictableIdleTimeMillis} property
* @see #minEvictableIdleTimeMillis
*/
@Override
public synchronized long getMinEvictableIdleTimeMillis() {
return this.minEvictableIdleTimeMillis;
}
/**
* Sets the {@link #minEvictableIdleTimeMillis} property.
*
* @param minEvictableIdleTimeMillis the minimum amount of time an object
* may sit idle in the pool
* @see #minEvictableIdleTimeMillis
*/
public synchronized void setMinEvictableIdleTimeMillis(long minEvictableIdleTimeMillis) {
this.minEvictableIdleTimeMillis = minEvictableIdleTimeMillis;
if (connectionPool != null) {
connectionPool.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
}
}
/**
* The minimum amount of time a connection may sit idle in the pool before
* it is eligible for eviction by the idle object evictor, with the extra
* condition that at least "minIdle" connections remain in the pool.
* Note that {@code minEvictableIdleTimeMillis} takes precedence over this
* parameter. See {@link #getSoftMinEvictableIdleTimeMillis()}.
*/
private long softMinEvictableIdleTimeMillis =
BaseObjectPoolConfig.DEFAULT_SOFT_MIN_EVICTABLE_IDLE_TIME_MILLIS;
/**
* Sets the minimum amount of time a connection may sit idle in the pool
* before it is eligible for eviction by the idle object evictor, with the
* extra condition that at least "minIdle" connections remain in the pool.
*
* @param softMinEvictableIdleTimeMillis minimum amount of time a
* connection may sit idle in the pool before it is eligible for eviction,
* assuming there are minIdle idle connections in the pool.
* @see #getSoftMinEvictableIdleTimeMillis
*/
public synchronized void setSoftMinEvictableIdleTimeMillis(long softMinEvictableIdleTimeMillis) {
this.softMinEvictableIdleTimeMillis = softMinEvictableIdleTimeMillis;
if (connectionPool != null) {
connectionPool.setSoftMinEvictableIdleTimeMillis(softMinEvictableIdleTimeMillis);
}
}
/**
* Returns the minimum amount of time a connection may sit idle in the
* pool before it is eligible for eviction by the idle object evictor, with
* the extra condition that at least "minIdle" connections remain in the
* pool.
*
* When {@link #getMinEvictableIdleTimeMillis() miniEvictableIdleTimeMillis}
* is set to a positive value, miniEvictableIdleTimeMillis is examined
* first by the idle connection evictor - i.e. when idle connections are
* visited by the evictor, idle time is first compared against
* {@code minEvictableIdleTimeMillis} (without considering the number of idle
* connections in the pool) and then against
* {@code softMinEvictableIdleTimeMillis}, including the {@code minIdle},
* constraint.
*
* @return minimum amount of time a connection may sit idle in the pool before
* it is eligible for eviction, assuming there are minIdle idle connections
* in the pool
*/
@Override
public synchronized long getSoftMinEvictableIdleTimeMillis() {
return softMinEvictableIdleTimeMillis;
}
private String evictionPolicyClassName =
BaseObjectPoolConfig.DEFAULT_EVICTION_POLICY_CLASS_NAME;
/**
* Gets the EvictionPolicy implementation in use with this connection pool.
*/
public synchronized String getEvictionPolicyClassName() {
return evictionPolicyClassName;
}
/**
* Sets the EvictionPolicy implementation to use with this connection pool.
*
* @param evictionPolicyClassName The fully qualified class name of the
* EvictionPolicy implementation
*/
public synchronized void setEvictionPolicyClassName(
String evictionPolicyClassName) {
if (connectionPool != null) {
connectionPool.setEvictionPolicyClassName(evictionPolicyClassName);
}
this.evictionPolicyClassName = evictionPolicyClassName;
}
/**
* The indication of whether objects will be validated by the idle object
* evictor (if any). If an object fails to validate, it will be dropped
* from the pool.
*/
private boolean testWhileIdle = false;
/**
* Returns the value of the {@link #testWhileIdle} property.
*
* @return true if objects examined by the idle object evictor are
* validated
* @see #testWhileIdle
*/
@Override
public synchronized boolean getTestWhileIdle() {
return this.testWhileIdle;
}
/**
* Sets the testWhileIdle property. This property determines
* whether or not the idle object evictor will validate connections.
*
* @param testWhileIdle new value for testWhileIdle property
*/
public synchronized void setTestWhileIdle(boolean testWhileIdle) {
this.testWhileIdle = testWhileIdle;
if (connectionPool != null) {
connectionPool.setTestWhileIdle(testWhileIdle);
}
}
/**
* [Read Only] The current number of active connections that have been
* allocated from this data source.
*
* @return the current number of active connections
*/
@Override
public synchronized int getNumActive() {
if (connectionPool != null) {
return connectionPool.getNumActive();
}
return 0;
}
/**
* [Read Only] The current number of idle connections that are waiting
* to be allocated from this data source.
*
* @return the current number of idle connections
*/
@Override
public synchronized int getNumIdle() {
if (connectionPool != null) {
return connectionPool.getNumIdle();
}
return 0;
}
/**
* The connection password to be passed to our JDBC driver to establish
* a connection.
*/
private volatile String password = null;
/**
* Returns the password passed to the JDBC driver to establish connections.
*
* @return the connection password
*/
@Override
public String getPassword() {
return this.password;
}
/**
* Sets the {@link #password}.
*
* Note: this method currently has no effect once the pool has been
* initialized. The pool is initialized the first time one of the
* following methods is invoked: getConnection, setLogwriter,
* setLoginTimeout, getLoginTimeout, getLogWriter.
*
* @param password new value for the password
*/
public void setPassword(String password) {
this.password = password;
}
/**
* The connection URL to be passed to our JDBC driver to establish
* a connection.
*/
private String url = null;
/**
* Returns the JDBC connection {@link #url} property.
*
* @return the {@link #url} passed to the JDBC driver to establish
* connections
*/
@Override
public synchronized String getUrl() {
return this.url;
}
/**
* Sets the {@link #url}.
*
* Note: this method currently has no effect once the pool has been
* initialized. The pool is initialized the first time one of the
* following methods is invoked: getConnection, setLogwriter,
* setLoginTimeout, getLoginTimeout, getLogWriter.
*
* @param url the new value for the JDBC connection url
*/
public synchronized void setUrl(String url) {
this.url = url;
}
/**
* The connection username to be passed to our JDBC driver to
* establish a connection.
*/
private String username = null;
/**
* Returns the JDBC connection {@link #username} property.
*
* @return the {@link #username} passed to the JDBC driver to establish
* connections
*/
@Override
public String getUsername() {
return this.username;
}
/**
* Sets the {@link #username}.
*
* Note: this method currently has no effect once the pool has been
* initialized. The pool is initialized the first time one of the
* following methods is invoked: getConnection, setLogwriter,
* setLoginTimeout, getLoginTimeout, getLogWriter.
*
* @param username the new value for the JDBC connection username
*/
public void setUsername(String username) {
this.username = username;
}
/**
* The SQL query that will be used to validate connections from this pool
* before returning them to the caller. If specified, this query
* MUST be an SQL SELECT statement that returns at least
* one row. If not specified, {@link Connection#isValid(int)} will be used
* to validate connections.
*/
private volatile String validationQuery = null;
/**
* Returns the validation query used to validate connections before
* returning them.
*
* @return the SQL validation query
* @see #validationQuery
*/
@Override
public String getValidationQuery() {
return this.validationQuery;
}
/**
* Sets the {@link #validationQuery}.
*
* Note: this method currently has no effect once the pool has been
* initialized. The pool is initialized the first time one of the
* following methods is invoked: getConnection, setLogwriter,
* setLoginTimeout, getLoginTimeout, getLogWriter.
*
* @param validationQuery the new value for the validation query
*/
public void setValidationQuery(String validationQuery) {
if (validationQuery != null && validationQuery.trim().length() > 0) {
this.validationQuery = validationQuery;
} else {
this.validationQuery = null;
}
}
/**
* Timeout in seconds before connection validation queries fail.
*/
private volatile int validationQueryTimeout = -1;
/**
* Returns the validation query timeout.
*
* @return the timeout in seconds before connection validation queries fail.
*/
@Override
public int getValidationQueryTimeout() {
return validationQueryTimeout;
}
/**
* Sets the validation query timeout, the amount of time, in seconds, that
* connection validation will wait for a response from the database when
* executing a validation query. Use a value less than or equal to 0 for
* no timeout.
*
* Note: this method currently has no effect once the pool has been
* initialized. The pool is initialized the first time one of the
* following methods is invoked: getConnection, setLogwriter,
* setLoginTimeout, getLoginTimeout, getLogWriter.
*
* @param timeout new validation query timeout value in seconds
*/
public void setValidationQueryTimeout(int timeout) {
this.validationQueryTimeout = timeout;
}
/**
* These SQL statements run once after a Connection is created.
*
* This property can be used for example to run ALTER SESSION SET
* NLS_SORT=XCYECH in an Oracle Database only once after connection
* creation.
*
*/
private volatile List connectionInitSqls;
/**
* Returns the list of SQL statements executed when a physical connection
* is first created. Returns an empty list if there are no initialization
* statements configured.
*
* @return initialization SQL statements
*/
public List getConnectionInitSqls() {
List result = connectionInitSqls;
if (result == null) {
return Collections.emptyList();
}
return result;
}
/**
* Provides the same data as {@link #getConnectionInitSqls()} but in an
* array so it is accessible via JMX.
*/
@Override
public String[] getConnectionInitSqlsAsArray() {
Collection result = getConnectionInitSqls();
return result.toArray(new String[result.size()]);
}
/**
* Sets the list of SQL statements to be executed when a physical
* connection is first created.
*
* Note: this method currently has no effect once the pool has been
* initialized. The pool is initialized the first time one of the
* following methods is invoked: getConnection, setLogwriter,
* setLoginTimeout, getLoginTimeout, getLogWriter.
*
* @param connectionInitSqls Collection of SQL statements to execute
* on connection creation
*/
public void setConnectionInitSqls(Collection connectionInitSqls) {
if (connectionInitSqls != null && connectionInitSqls.size() > 0) {
ArrayList newVal = null;
for (String s : connectionInitSqls) {
if (s != null && s.trim().length() > 0) {
if (newVal == null) {
newVal = new ArrayList<>();
}
newVal.add(s);
}
}
this.connectionInitSqls = newVal;
} else {
this.connectionInitSqls = null;
}
}
/**
* Controls access to the underlying connection.
*/
private boolean accessToUnderlyingConnectionAllowed = false;
/**
* Returns the value of the accessToUnderlyingConnectionAllowed property.
*
* @return true if access to the underlying connection is allowed, false
* otherwise.
*/
@Override
public synchronized boolean isAccessToUnderlyingConnectionAllowed() {
return this.accessToUnderlyingConnectionAllowed;
}
/**
* Sets the value of the accessToUnderlyingConnectionAllowed property.
* It controls if the PoolGuard allows access to the underlying connection.
* (Default: false)
*
* Note: this method currently has no effect once the pool has been
* initialized. The pool is initialized the first time one of the
* following methods is invoked: getConnection, setLogwriter,
* setLoginTimeout, getLoginTimeout, getLogWriter.
*
* @param allow Access to the underlying connection is granted when true.
*/
public synchronized void setAccessToUnderlyingConnectionAllowed(boolean allow) {
this.accessToUnderlyingConnectionAllowed = allow;
}
private long maxConnLifetimeMillis = -1;
/**
* Returns the maximum permitted lifetime of a connection in milliseconds. A
* value of zero or less indicates an infinite lifetime.
*/
@Override
public long getMaxConnLifetimeMillis() {
return maxConnLifetimeMillis;
}
/**
* Sets the maximum permitted lifetime of a connection in
* milliseconds. A value of zero or less indicates an infinite lifetime.
*
* Note: this method currently has no effect once the pool has been
* initialized. The pool is initialized the first time one of the
* following methods is invoked: getConnection, setLogwriter,
* setLoginTimeout, getLoginTimeout, getLogWriter.
*/
public void setMaxConnLifetimeMillis(long maxConnLifetimeMillis) {
this.maxConnLifetimeMillis = maxConnLifetimeMillis;
}
private String jmxName = null;
/**
* Returns the JMX name that has been requested for this DataSource. If the
* requested name is not valid, an alternative may be chosen.
*/
public String getJmxName() {
return jmxName;
}
/**
* Sets the JMX name that has been requested for this DataSource. If the
* requested name is not valid, an alternative may be chosen. This
* DataSource will attempt to register itself using this name. If another
* component registers this DataSource with JMX and this name is valid this
* name will be used in preference to any specified by the other component.
*/
public void setJmxName(String jmxName) {
this.jmxName = jmxName;
}
private boolean enableAutoCommitOnReturn = true;
/**
* Returns the value of the flag that controls whether or not connections
* being returned to the pool will checked and configured with
* {@link Connection#setAutoCommit(boolean) Connection.setAutoCommit(true)}
* if the auto commit setting is false when the connection
* is returned. It is true by default.
*/
public boolean getEnableAutoCommitOnReturn() {
return enableAutoCommitOnReturn;
}
/**
* Sets the value of the flag that controls whether or not connections
* being returned to the pool will checked and configured with
* {@link Connection#setAutoCommit(boolean) Connection.setAutoCommit(true)}
* if the auto commit setting is false when the connection
* is returned. It is true by default.
*/
public void setEnableAutoCommitOnReturn(boolean enableAutoCommitOnReturn) {
this.enableAutoCommitOnReturn = enableAutoCommitOnReturn;
}
private boolean rollbackOnReturn = true;
/**
* Gets the current value of the flag that controls if a connection will be
* rolled back when it is returned to the pool if auto commit is not enabled
* and the connection is not read only.
*/
public boolean getRollbackOnReturn() {
return rollbackOnReturn;
}
/**
* Sets the flag that controls if a connection will be rolled back when it
* is returned to the pool if auto commit is not enabled and the connection
* is not read only.
*/
public void setRollbackOnReturn(boolean rollbackOnReturn) {
this.rollbackOnReturn = rollbackOnReturn;
}
// ----------------------------------------------------- Instance Variables
/**
* The object pool that internally manages our connections.
*/
private volatile GenericObjectPool connectionPool = null;
protected GenericObjectPool getConnectionPool() {
return connectionPool;
}
/**
* The connection properties that will be sent to our JDBC driver when
* establishing new connections. NOTE - The "user" and
* "password" properties will be passed explicitly, so they do not need
* to be included here.
*/
private Properties connectionProperties = new Properties();
// For unit testing
Properties getConnectionProperties() {
return connectionProperties;
}
/**
* The data source we will use to manage connections. This object should
* be acquired ONLY by calls to the
* createDataSource() method.
*/
private volatile DataSource dataSource = null;
/**
* The PrintWriter to which log messages should be directed.
*/
private volatile PrintWriter logWriter = new PrintWriter(new OutputStreamWriter(
System.out, StandardCharsets.UTF_8));
// ----------------------------------------------------- DataSource Methods
/**
* Create (if necessary) and return a connection to the database.
*
* @throws SQLException if a database access error occurs
* @return a database connection
*/
@Override
public Connection getConnection() throws SQLException {
if (Utils.IS_SECURITY_ENABLED) {
PrivilegedExceptionAction action = new PaGetConnection();
try {
return AccessController.doPrivileged(action);
} catch (PrivilegedActionException e) {
Throwable cause = e.getCause();
if (cause instanceof SQLException) {
throw (SQLException) cause;
}
throw new SQLException(e);
}
}
return createDataSource().getConnection();
}
/**
* BasicDataSource does NOT support this method.
*
* @param user Database user on whose behalf the Connection
* is being made
* @param pass The database user's password
*
* @throws UnsupportedOperationException
* @throws SQLException if a database access error occurs
* @return nothing - always throws UnsupportedOperationException
*/
@Override
public Connection getConnection(String user, String pass) throws SQLException {
// This method isn't supported by the PoolingDataSource returned by
// the createDataSource
throw new UnsupportedOperationException("Not supported by BasicDataSource");
}
/**
* BasicDataSource does NOT support this method.
*
* Returns the login timeout (in seconds) for connecting to the database.
*
* Calls {@link #createDataSource()}, so has the side effect
* of initializing the connection pool.
*
* @throws SQLException if a database access error occurs
* @throws UnsupportedOperationException If the DataSource implementation
* does not support the login timeout feature.
* @return login timeout in seconds
*/
@Override
public int getLoginTimeout() throws SQLException {
// This method isn't supported by the PoolingDataSource returned by
// the createDataSource
throw new UnsupportedOperationException("Not supported by BasicDataSource");
}
/**
* Returns the log writer being used by this data source.
*
* Calls {@link #createDataSource()}, so has the side effect
* of initializing the connection pool.
*
* @throws SQLException if a database access error occurs
* @return log writer in use
*/
@Override
public PrintWriter getLogWriter() throws SQLException {
return createDataSource().getLogWriter();
}
/**
* BasicDataSource does NOT support this method.
*
* Set the login timeout (in seconds) for connecting to the
* database.
*
* Calls {@link #createDataSource()}, so has the side effect
* of initializing the connection pool.
*
* @param loginTimeout The new login timeout, or zero for no timeout
* @throws UnsupportedOperationException If the DataSource implementation
* does not support the login timeout feature.
* @throws SQLException if a database access error occurs
*/
@Override
public void setLoginTimeout(int loginTimeout) throws SQLException {
// This method isn't supported by the PoolingDataSource returned by
// the createDataSource
throw new UnsupportedOperationException("Not supported by BasicDataSource");
}
/**
* Sets the log writer being used by this data source.
*
* Calls {@link #createDataSource()}, so has the side effect
* of initializing the connection pool.
*
* @param logWriter The new log writer
* @throws SQLException if a database access error occurs
*/
@Override
public void setLogWriter(PrintWriter logWriter) throws SQLException {
createDataSource().setLogWriter(logWriter);
this.logWriter = logWriter;
}
private AbandonedConfig abandonedConfig;
/**
* Flag to remove abandoned connections if they exceed the
* removeAbandonedTimeout when borrowObject is invoked.
*
* The default value is false.
*
*
If set to true a connection is considered abandoned and eligible
* for removal if it has not been used for more than
* {@link #getRemoveAbandonedTimeout() removeAbandonedTimeout} seconds.
*
* Abandoned connections are identified and removed when
* {@link #getConnection()} is invoked and the following conditions hold
*
- {@link #getRemoveAbandonedOnBorrow()} or
* {@link #getRemoveAbandonedOnMaintenance()} = true
* - {@link #getNumActive()} > {@link #getMaxTotal()} - 3
* - {@link #getNumIdle()} < 2
*
* @see #getRemoveAbandonedTimeout()
*/
@Override
public boolean getRemoveAbandonedOnBorrow() {
if (abandonedConfig != null) {
return abandonedConfig.getRemoveAbandonedOnBorrow();
}
return false;
}
/**
* Flag to remove abandoned connections if they exceed the
* removeAbandonedTimeout when borrowObject is invoked.
*
* If set to true a connection is considered abandoned and eligible
* for removal if it has been idle longer than the
* {@link #getRemoveAbandonedTimeout() removeAbandonedTimeout}.
*
* Setting this to true can recover db connections from poorly written
* applications which fail to close a connection.
*
* @param removeAbandonedOnMaintenance true means abandoned connections will
* be removed when borrowObject is
* invoked
*/
public void setRemoveAbandonedOnMaintenance(
boolean removeAbandonedOnMaintenance) {
if (abandonedConfig == null) {
abandonedConfig = new AbandonedConfig();
}
abandonedConfig.setRemoveAbandonedOnMaintenance(
removeAbandonedOnMaintenance);
}
/**
* Flag to remove abandoned connections if they exceed the
* removeAbandonedTimeout during pool maintenance.
*
* The default value is false.
*
*
If set to true a connection is considered abandoned and eligible
* for removal if it has not been used for more than
* {@link #getRemoveAbandonedTimeout() removeAbandonedTimeout} seconds.
*
* Abandoned connections are identified and removed when
* {@link #getConnection()} is invoked and the following conditions hold
*
- {@link #getRemoveAbandonedOnBorrow()} or
* {@link #getRemoveAbandonedOnMaintenance()} = true
* - {@link #getNumActive()} > {@link #getMaxTotal()} - 3
* - {@link #getNumIdle()} < 2
*
* @see #getRemoveAbandonedTimeout()
*/
@Override
public boolean getRemoveAbandonedOnMaintenance() {
if (abandonedConfig != null) {
return abandonedConfig.getRemoveAbandonedOnMaintenance();
}
return false;
}
/**
* Flag to remove abandoned connections if they exceed the
* removeAbandonedTimeout during pool maintenance.
*
* If set to true a connection is considered abandoned and eligible
* for removal if it has been idle longer than the
* {@link #getRemoveAbandonedTimeout() removeAbandonedTimeout}.
*
* Setting this to true can recover db connections from poorly written
* applications which fail to close a connection.
*
* @param removeAbandonedOnBorrow true means abandoned connections will be
* removed during pool maintenance
*/
public void setRemoveAbandonedOnBorrow(boolean removeAbandonedOnBorrow) {
if (abandonedConfig == null) {
abandonedConfig = new AbandonedConfig();
}
abandonedConfig.setRemoveAbandonedOnBorrow(removeAbandonedOnBorrow);
}
/**
* Timeout in seconds before an abandoned connection can be removed.
*
* Creating a Statement, PreparedStatement or CallableStatement or using
* one of these to execute a query (using one of the execute methods)
* resets the lastUsed property of the parent connection.
*
* Abandoned connection cleanup happens when
*
* - {@link #getRemoveAbandonedOnBorrow()} or
* {@link #getRemoveAbandonedOnMaintenance()} = true
* - {@link #getNumIdle() numIdle} < 2
* - {@link #getNumActive() numActive} > {@link #getMaxTotal() maxTotal} - 3
*
*
* The default value is 300 seconds.
*/
@Override
public int getRemoveAbandonedTimeout() {
if (abandonedConfig != null) {
return abandonedConfig.getRemoveAbandonedTimeout();
}
return 300;
}
/**
* Sets the timeout in seconds before an abandoned connection can be
* removed.
*
* Setting this property has no effect if
* {@link #getRemoveAbandonedOnBorrow()} and
* {@link #getRemoveAbandonedOnMaintenance()} are false.
*
* @param removeAbandonedTimeout new abandoned timeout in seconds
* @see #getRemoveAbandonedTimeout()
* @see #getRemoveAbandonedOnBorrow()
* @see #getRemoveAbandonedOnMaintenance()
*/
public void setRemoveAbandonedTimeout(int removeAbandonedTimeout) {
if (abandonedConfig == null) {
abandonedConfig = new AbandonedConfig();
}
abandonedConfig.setRemoveAbandonedTimeout(removeAbandonedTimeout);
}
/**
* Flag to log stack traces for application code which abandoned
* a Statement or Connection.
*
* Defaults to false.
*
* Logging of abandoned Statements and Connections adds overhead
* for every Connection open or new Statement because a stack
* trace has to be generated.
*/
@Override
public boolean getLogAbandoned() {
if (abandonedConfig != null) {
return abandonedConfig.getLogAbandoned();
}
return false;
}
/**
* @param logAbandoned new logAbandoned property value
*/
public void setLogAbandoned(boolean logAbandoned) {
if (abandonedConfig == null) {
abandonedConfig = new AbandonedConfig();
}
abandonedConfig.setLogAbandoned(logAbandoned);
}
/**
* Gets the log writer to be used by this configuration to log
* information on abandoned objects.
*/
public PrintWriter getAbandonedLogWriter() {
if (abandonedConfig != null) {
return abandonedConfig.getLogWriter();
}
return null;
}
/**
* Sets the log writer to be used by this configuration to log
* information on abandoned objects.
*
* @param logWriter The new log writer
*/
public void setAbandonedLogWriter(PrintWriter logWriter) {
if (abandonedConfig == null) {
abandonedConfig = new AbandonedConfig();
}
abandonedConfig.setLogWriter(logWriter);
}
/**
* If the connection pool implements {@link org.apache.commons.pool2.UsageTracking UsageTracking}, should the
* connection pool record a stack trace every time a method is called on a
* pooled connection and retain the most recent stack trace to aid debugging
* of abandoned connections?
*
* @return true if usage tracking is enabled
*/
@Override
public boolean getAbandonedUsageTracking() {
if (abandonedConfig != null) {
return abandonedConfig.getUseUsageTracking();
}
return false;
}
/**
* If the connection pool implements {@link org.apache.commons.pool2.UsageTracking UsageTracking}, configure
* whether the connection pool should record a stack trace every time a
* method is called on a pooled connection and retain the most recent stack
* trace to aid debugging of abandoned connections.
*
* @param usageTracking A value of true will enable
* the recording of a stack trace on every use
* of a pooled connection
*/
public void setAbandonedUsageTracking(boolean usageTracking) {
if (abandonedConfig == null) {
abandonedConfig = new AbandonedConfig();
}
abandonedConfig.setUseUsageTracking(usageTracking);
}
// --------------------------------------------------------- Public Methods
/**
* Add a custom connection property to the set that will be passed to our
* JDBC driver. This MUST be called before the first
* connection is retrieved (along with all the other configuration
* property setters). Calls to this method after the connection pool
* has been initialized have no effect.
*
* @param name Name of the custom connection property
* @param value Value of the custom connection property
*/
public void addConnectionProperty(String name, String value) {
connectionProperties.put(name, value);
}
/**
* Remove a custom connection property.
*
* @param name Name of the custom connection property to remove
* @see #addConnectionProperty(String, String)
*/
public void removeConnectionProperty(String name) {
connectionProperties.remove(name);
}
/**
* Sets the connection properties passed to driver.connect(...).
*
* Format of the string must be [propertyName=property;]*
*
* NOTE - The "user" and "password" properties will be added
* explicitly, so they do not need to be included here.
*
* @param connectionProperties the connection properties used to
* create new connections
*/
public void setConnectionProperties(String connectionProperties) {
if (connectionProperties == null) {
throw new NullPointerException("connectionProperties is null");
}
String[] entries = connectionProperties.split(";");
Properties properties = new Properties();
for (String entry : entries) {
if (entry.length() > 0) {
int index = entry.indexOf('=');
if (index > 0) {
String name = entry.substring(0, index);
String value = entry.substring(index + 1);
properties.setProperty(name, value);
} else {
// no value is empty string which is how java.util.Properties works
properties.setProperty(entry, "");
}
}
}
this.connectionProperties = properties;
}
private boolean closed;
/**
* Closes and releases all idle connections that are currently stored in the connection pool
* associated with this data source.
*
* Connections that are checked out to clients when this method is invoked are not affected.
* When client applications subsequently invoke {@link Connection#close()} to return
* these connections to the pool, the underlying JDBC connections are closed.
*
* Attempts to acquire connections using {@link #getConnection()} after this method has been
* invoked result in SQLExceptions.
*
*
This method is idempotent - i.e., closing an already closed BasicDataSource has no effect
* and does not generate exceptions.
*
* @throws SQLException if an error occurs closing idle connections
*/
public synchronized void close() throws SQLException {
if (registeredJmxName != null) {
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
try {
mbs.unregisterMBean(registeredJmxName);
} catch (JMException e) {
log.warn("Failed to unregister the JMX name: " + registeredJmxName, e);
} finally {
registeredJmxName = null;
}
}
closed = true;
GenericObjectPool oldpool = connectionPool;
connectionPool = null;
dataSource = null;
try {
if (oldpool != null) {
oldpool.close();
}
} catch(RuntimeException e) {
throw e;
} catch(Exception e) {
throw new SQLException("Cannot close connection pool", e);
}
}
/**
* If true, this data source is closed and no more connections can be retrieved from this datasource.
* @return true, if the data source is closed; false otherwise
*/
@Override
public synchronized boolean isClosed() {
return closed;
}
@Override
public boolean isWrapperFor(Class iface) throws SQLException {
return false;
}
@Override
public T unwrap(Class iface) throws SQLException {
throw new SQLException("BasicDataSource is not a wrapper.");
}
@Override
public Logger getParentLogger() throws SQLFeatureNotSupportedException {
throw new SQLFeatureNotSupportedException();
}
// ------------------------------------------------------ Protected Methods
/**
* Create (if necessary) and return the internal data source we are
* using to manage our connections.
*
* @throws SQLException if the object pool cannot be created.
*/
protected DataSource createDataSource()
throws SQLException {
if (closed) {
throw new SQLException("Data source is closed");
}
// Return the pool if we have already created it
// This is double-checked locking. This is safe since dataSource is
// volatile and the code is targeted at Java 5 onwards.
if (dataSource != null) {
return dataSource;
}
synchronized (this) {
if (dataSource != null) {
return dataSource;
}
jmxRegister();
// create factory which returns raw physical connections
ConnectionFactory driverConnectionFactory = createConnectionFactory();
// Set up the poolable connection factory
boolean success = false;
PoolableConnectionFactory poolableConnectionFactory;
try {
poolableConnectionFactory = createPoolableConnectionFactory(
driverConnectionFactory);
poolableConnectionFactory.setPoolStatements(
poolPreparedStatements);
poolableConnectionFactory.setMaxOpenPrepatedStatements(
maxOpenPreparedStatements);
success = true;
} catch (SQLException se) {
throw se;
} catch (RuntimeException rte) {
throw rte;
} catch (Exception ex) {
throw new SQLException("Error creating connection factory", ex);
}
if (success) {
// create a pool for our connections
createConnectionPool(poolableConnectionFactory);
}
// Create the pooling data source to manage connections
success = false;
try {
dataSource = createDataSourceInstance();
dataSource.setLogWriter(logWriter);
success = true;
} catch (SQLException se) {
throw se;
} catch (RuntimeException rte) {
throw rte;
} catch (Exception ex) {
throw new SQLException("Error creating datasource", ex);
} finally {
if (!success) {
closeConnectionPool();
}
}
// If initialSize > 0, preload the pool
try {
for (int i = 0 ; i < initialSize ; i++) {
connectionPool.addObject();
}
} catch (Exception e) {
closeConnectionPool();
throw new SQLException("Error preloading the connection pool", e);
}
// If timeBetweenEvictionRunsMillis > 0, start the pool's evictor task
startPoolMaintenance();
return dataSource;
}
}
/**
* Creates a JDBC connection factory for this datasource. The JDBC driver
* is loaded using the following algorithm:
*
* - If a Driver instance has been specified via
* {@link #setDriver(Driver)} use it
* - If no Driver instance was specified and {@link #driverClassName} is
* specified that class is loaded using the {@link ClassLoader} of this
* class or, if {@link #driverClassLoader} is set, {@link #driverClassName}
* is loaded with the specified {@link ClassLoader}.
* - If {@link #driverClassName} is specified and the previous attempt
* fails, the class is loaded using the context class loader of the current
* thread.
* - If a driver still isn't loaded one is loaded via the
* {@link DriverManager} using the specified {@link #url}.
*
* This method exists so subclasses can replace the implementation class.
*/
protected ConnectionFactory createConnectionFactory() throws SQLException {
// Load the JDBC driver class
Driver driverToUse = this.driver;
if (driverToUse == null) {
Class driverFromCCL = null;
if (driverClassName != null) {
try {
try {
if (driverClassLoader == null) {
driverFromCCL = Class.forName(driverClassName);
} else {
driverFromCCL = Class.forName(
driverClassName, true, driverClassLoader);
}
} catch (ClassNotFoundException cnfe) {
driverFromCCL = Thread.currentThread(
).getContextClassLoader().loadClass(
driverClassName);
}
} catch (Exception t) {
String message = "Cannot load JDBC driver class '" +
driverClassName + "'";
logWriter.println(message);
t.printStackTrace(logWriter);
throw new SQLException(message, t);
}
}
try {
if (driverFromCCL == null) {
driverToUse = DriverManager.getDriver(url);
} else {
// Usage of DriverManager is not possible, as it does not
// respect the ContextClassLoader
// N.B. This cast may cause ClassCastException which is handled below
driverToUse = (Driver) driverFromCCL.newInstance();
if (!driverToUse.acceptsURL(url)) {
throw new SQLException("No suitable driver", "08001");
}
}
} catch (Exception t) {
String message = "Cannot create JDBC driver of class '" +
(driverClassName != null ? driverClassName : "") +
"' for connect URL '" + url + "'";
logWriter.println(message);
t.printStackTrace(logWriter);
throw new SQLException(message, t);
}
}
// Set up the driver connection factory we will use
String user = username;
if (user != null) {
connectionProperties.put("user", user);
} else {
log("DBCP DataSource configured without a 'username'");
}
String pwd = password;
if (pwd != null) {
connectionProperties.put("password", pwd);
} else {
log("DBCP DataSource configured without a 'password'");
}
ConnectionFactory driverConnectionFactory =
new DriverConnectionFactory(driverToUse, url, connectionProperties);
return driverConnectionFactory;
}
/**
* Creates a connection pool for this datasource. This method only exists
* so subclasses can replace the implementation class.
*
* This implementation configures all pool properties other than
* timeBetweenEvictionRunsMillis. Setting that property is deferred to
* {@link #startPoolMaintenance()}, since setting timeBetweenEvictionRunsMillis
* to a positive value causes {@link GenericObjectPool}'s eviction timer
* to be started.
*/
protected void createConnectionPool(PoolableConnectionFactory factory) {
// Create an object pool to contain our active connections
GenericObjectPoolConfig config = new GenericObjectPoolConfig();
updateJmxName(config);
GenericObjectPool gop;
if (abandonedConfig != null &&
(abandonedConfig.getRemoveAbandonedOnBorrow() ||
abandonedConfig.getRemoveAbandonedOnMaintenance())) {
gop = new GenericObjectPool<>(factory, config, abandonedConfig);
}
else {
gop = new GenericObjectPool<>(factory, config);
}
gop.setMaxTotal(maxTotal);
gop.setMaxIdle(maxIdle);
gop.setMinIdle(minIdle);
gop.setMaxWaitMillis(maxWaitMillis);
gop.setTestOnCreate(testOnCreate);
gop.setTestOnBorrow(testOnBorrow);
gop.setTestOnReturn(testOnReturn);
gop.setNumTestsPerEvictionRun(numTestsPerEvictionRun);
gop.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
gop.setTestWhileIdle(testWhileIdle);
gop.setLifo(lifo);
gop.setSwallowedExceptionListener(new SwallowedExceptionLogger(log));
factory.setPool(gop);
connectionPool = gop;
}
/**
* Closes the connection pool, silently swallowing any exception that occurs.
*/
private void closeConnectionPool() {
GenericObjectPool oldpool = connectionPool;
connectionPool = null;
try {
if (oldpool != null) {
oldpool.close();
}
} catch(Exception e) {
/* Ignore */
}
}
/**
* Starts the connection pool maintenance task, if configured.
*/
protected void startPoolMaintenance() {
if (connectionPool != null && timeBetweenEvictionRunsMillis > 0) {
connectionPool.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
}
}
/**
* Creates the actual data source instance. This method only exists so
* that subclasses can replace the implementation class.
*
* @throws SQLException if unable to create a datasource instance
*/
protected DataSource createDataSourceInstance() throws SQLException {
PoolingDataSource pds = new PoolingDataSource<>(connectionPool);
pds.setAccessToUnderlyingConnectionAllowed(isAccessToUnderlyingConnectionAllowed());
return pds;
}
/**
* Creates the PoolableConnectionFactory and attaches it to the connection pool. This method only exists
* so subclasses can replace the default implementation.
*
* @param driverConnectionFactory JDBC connection factory
* @throws SQLException if an error occurs creating the PoolableConnectionFactory
*/
protected PoolableConnectionFactory createPoolableConnectionFactory(
ConnectionFactory driverConnectionFactory) throws SQLException {
PoolableConnectionFactory connectionFactory = null;
try {
connectionFactory = new PoolableConnectionFactory(driverConnectionFactory, registeredJmxName);
connectionFactory.setValidationQuery(validationQuery);
connectionFactory.setValidationQueryTimeout(validationQueryTimeout);
connectionFactory.setConnectionInitSql(connectionInitSqls);
connectionFactory.setDefaultReadOnly(defaultReadOnly);
connectionFactory.setDefaultAutoCommit(defaultAutoCommit);
connectionFactory.setDefaultTransactionIsolation(defaultTransactionIsolation);
connectionFactory.setDefaultCatalog(defaultCatalog);
connectionFactory.setCacheState(cacheState);
connectionFactory.setPoolStatements(poolPreparedStatements);
connectionFactory.setMaxOpenPrepatedStatements(maxOpenPreparedStatements);
connectionFactory.setMaxConnLifetimeMillis(maxConnLifetimeMillis);
connectionFactory.setRollbackOnReturn(getRollbackOnReturn());
connectionFactory.setEnableAutoCommitOnReturn(getEnableAutoCommitOnReturn());
connectionFactory.setDefaultQueryTimeout(getDefaultQueryTimeout());
validateConnectionFactory(connectionFactory);
} catch (RuntimeException e) {
throw e;
} catch (Exception e) {
throw new SQLException("Cannot create PoolableConnectionFactory (" + e.getMessage() + ")", e);
}
return connectionFactory;
}
protected static void validateConnectionFactory(
PoolableConnectionFactory connectionFactory) throws Exception {
PoolableConnection conn = null;
PooledObject p = null;
try {
p = connectionFactory.makeObject();
conn = p.getObject();
connectionFactory.activateObject(p);
connectionFactory.validateConnection(conn);
connectionFactory.passivateObject(p);
}
finally {
if (p != null) {
connectionFactory.destroyObject(p);
}
}
}
protected void log(String message) {
if (logWriter != null) {
logWriter.println(message);
}
}
/**
* Actual name under which this component has been registered.
*/
private ObjectName registeredJmxName = null;
private void jmxRegister() {
// Return immediately if this DataSource has already been registered
if (registeredJmxName != null) {
return;
}
// Return immediately if no JMX name has been specified
String requestedName = getJmxName();
if (requestedName == null) {
return;
}
ObjectName oname;
try {
oname = new ObjectName(requestedName);
} catch (MalformedObjectNameException e) {
log.warn("The requested JMX name [" + requestedName +
"] was not valid and will be ignored.");
return;
}
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
try {
mbs.registerMBean(this, oname);
} catch (InstanceAlreadyExistsException | MBeanRegistrationException
| NotCompliantMBeanException e) {
log.warn("Failed to complete JMX registration", e);
}
}
@Override
public ObjectName preRegister(MBeanServer server, ObjectName name) {
String requestedName = getJmxName();
if (requestedName != null) {
try {
registeredJmxName = new ObjectName(requestedName);
} catch (MalformedObjectNameException e) {
log.warn("The requested JMX name [" + requestedName +
"] was not valid and will be ignored.");
}
}
if (registeredJmxName == null) {
registeredJmxName = name;
}
return registeredJmxName;
}
@Override
public void postRegister(Boolean registrationDone) {
// NO-OP
}
@Override
public void preDeregister() throws Exception {
// NO-OP
}
@Override
public void postDeregister() {
// NO-OP
}
private void updateJmxName(GenericObjectPoolConfig config) {
if (registeredJmxName == null) {
return;
}
StringBuilder base = new StringBuilder(registeredJmxName.toString());
base.append(Constants.JMX_CONNECTION_POOL_BASE_EXT);
config.setJmxNameBase(base.toString());
config.setJmxNamePrefix(Constants.JMX_CONNECTION_POOL_PREFIX);
}
protected ObjectName getRegisteredJmxName() {
return registeredJmxName;
}
/**
* @since 2.0
*/
private class PaGetConnection implements PrivilegedExceptionAction {
@Override
public Connection run() throws SQLException {
return createDataSource().getConnection();
}
}
}