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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.cpdsadapter;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Vector;
import javax.sql.ConnectionEvent;
import javax.sql.ConnectionEventListener;
import javax.sql.PooledConnection;
import javax.sql.StatementEventListener;
import org.apache.commons.dbcp2.DelegatingConnection;
import org.apache.commons.dbcp2.DelegatingPreparedStatement;
import org.apache.commons.dbcp2.Jdbc41Bridge;
import org.apache.commons.dbcp2.PStmtKey;
import org.apache.commons.dbcp2.PoolableCallableStatement;
import org.apache.commons.dbcp2.PoolablePreparedStatement;
import org.apache.commons.dbcp2.PoolingConnection.StatementType;
import org.apache.commons.pool2.KeyedObjectPool;
import org.apache.commons.pool2.KeyedPooledObjectFactory;
import org.apache.commons.pool2.PooledObject;
import org.apache.commons.pool2.impl.DefaultPooledObject;
/**
* Implementation of PooledConnection that is returned by PooledConnectionDataSource.
*
* @since 2.0
*/
class PooledConnectionImpl
implements PooledConnection, KeyedPooledObjectFactory {
private static final String CLOSED = "Attempted to use PooledConnection after closed() was called.";
/**
* The JDBC database connection that represents the physical db connection.
*/
private Connection connection;
/**
* A DelegatingConnection used to create a PoolablePreparedStatementStub.
*/
private final DelegatingConnection delegatingConnection;
/**
* The JDBC database logical connection.
*/
private Connection logicalConnection;
/**
* ConnectionEventListeners.
*/
private final Vector eventListeners;
/**
* StatementEventListeners.
*/
private final Vector statementEventListeners = new Vector<>();
/**
* Flag set to true, once {@link #close()} is called.
*/
private boolean closed;
/** My pool of {@link PreparedStatement}s. */
private KeyedObjectPool pStmtPool;
/**
* Controls access to the underlying connection.
*/
private boolean accessToUnderlyingConnectionAllowed;
/**
* Wraps the real connection.
*
* @param connection
* the connection to be wrapped.
*/
PooledConnectionImpl(final Connection connection) {
this.connection = connection;
if (connection instanceof DelegatingConnection) {
this.delegatingConnection = (DelegatingConnection) connection;
} else {
this.delegatingConnection = new DelegatingConnection<>(connection);
}
eventListeners = new Vector<>();
closed = false;
}
/**
* My {@link KeyedPooledObjectFactory} method for activating {@link PreparedStatement}s.
*
* @param key
* Ignored.
* @param pooledObject
* Ignored.
*/
@Override
public void activateObject(final PStmtKey key, final PooledObject pooledObject)
throws Exception {
pooledObject.getObject().activate();
}
/**
* {@inheritDoc}
*/
@Override
public void addConnectionEventListener(final ConnectionEventListener listener) {
if (!eventListeners.contains(listener)) {
eventListeners.add(listener);
}
}
/* JDBC_4_ANT_KEY_BEGIN */
@Override
public void addStatementEventListener(final StatementEventListener listener) {
if (!statementEventListeners.contains(listener)) {
statementEventListeners.add(listener);
}
}
/* JDBC_4_ANT_KEY_END */
/**
* Throws an SQLException, if isClosed is true
*/
private void assertOpen() throws SQLException {
if (closed) {
throw new SQLException(CLOSED);
}
}
/**
* Closes the physical connection and marks this PooledConnection so that it may not be used to
* generate any more logical Connections.
*
* @throws SQLException
* Thrown when an error occurs or the connection is already closed.
*/
@Override
public void close() throws SQLException {
assertOpen();
closed = true;
try {
if (pStmtPool != null) {
try {
pStmtPool.close();
} finally {
pStmtPool = null;
}
}
} catch (final RuntimeException e) {
throw e;
} catch (final Exception e) {
throw new SQLException("Cannot close connection (return to pool failed)", e);
} finally {
try {
connection.close();
} finally {
connection = null;
}
}
}
/**
* Creates a {@link PStmtKey} for the given arguments.
*
* @param sql
* The SQL statement.
* @return a {@link PStmtKey} for the given arguments.
*/
protected PStmtKey createKey(final String sql) {
return new PStmtKey(normalizeSQL(sql), getCatalogOrNull(), getSchemaOrNull());
}
/**
* Creates a {@link PStmtKey} for the given arguments.
*
* @param sql
* The SQL statement.
* @param autoGeneratedKeys
* A flag indicating whether auto-generated keys should be returned; one of
* Statement.RETURN_GENERATED_KEYS or Statement.NO_GENERATED_KEYS.
* @return a key to uniquely identify a prepared statement.
*/
protected PStmtKey createKey(final String sql, final int autoGeneratedKeys) {
return new PStmtKey(normalizeSQL(sql), getCatalogOrNull(), getSchemaOrNull(), autoGeneratedKeys);
}
/**
* Creates a {@link PStmtKey} for the given arguments.
*
* @param sql
* The SQL statement.
* @param columnIndexes
* An array of column indexes indicating the columns that should be returned from the inserted row or
* rows.
* @return a key to uniquely identify a prepared statement.
*/
protected PStmtKey createKey(final String sql, final int columnIndexes[]) {
return new PStmtKey(normalizeSQL(sql), getCatalogOrNull(), getSchemaOrNull(), columnIndexes);
}
/**
* Creates a {@link PStmtKey} for the given arguments.
*
* @param sql
* The SQL statement.
* @param resultSetType
* A result set type; one of ResultSet.TYPE_FORWARD_ONLY,
* ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE.
* @param resultSetConcurrency
* A concurrency type; one of ResultSet.CONCUR_READ_ONLY or
* ResultSet.CONCUR_UPDATABLE.
* @return a key to uniquely identify a prepared statement.
*/
protected PStmtKey createKey(final String sql, final int resultSetType, final int resultSetConcurrency) {
return new PStmtKey(normalizeSQL(sql), getCatalogOrNull(), getSchemaOrNull(), resultSetType,
resultSetConcurrency);
}
/**
* Creates a {@link PStmtKey} for the given arguments.
*
* @param sql
* The SQL statement.
* @param resultSetType
* a result set type; one of ResultSet.TYPE_FORWARD_ONLY,
* ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE.
* @param resultSetConcurrency
* A concurrency type; one of ResultSet.CONCUR_READ_ONLY or
* ResultSet.CONCUR_UPDATABLE
* @param resultSetHoldability
* One of the following ResultSet constants: ResultSet.HOLD_CURSORS_OVER_COMMIT
* or ResultSet.CLOSE_CURSORS_AT_COMMIT.
* @return a key to uniquely identify a prepared statement.
*/
protected PStmtKey createKey(final String sql, final int resultSetType, final int resultSetConcurrency,
final int resultSetHoldability) {
return new PStmtKey(normalizeSQL(sql), getCatalogOrNull(), getSchemaOrNull(), resultSetType,
resultSetConcurrency, resultSetHoldability);
}
/**
* Creates a {@link PStmtKey} for the given arguments.
*
* @param sql
* The SQL statement.
* @param resultSetType
* a result set type; one of ResultSet.TYPE_FORWARD_ONLY,
* ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE
* @param resultSetConcurrency
* A concurrency type; one of ResultSet.CONCUR_READ_ONLY or
* ResultSet.CONCUR_UPDATABLE.
* @param resultSetHoldability
* One of the following ResultSet constants: ResultSet.HOLD_CURSORS_OVER_COMMIT
* or ResultSet.CLOSE_CURSORS_AT_COMMIT.
* @param statementType
* The SQL statement type, prepared or callable.
* @return a key to uniquely identify a prepared statement.
* @since 2.4.0
*/
protected PStmtKey createKey(final String sql, final int resultSetType, final int resultSetConcurrency,
final int resultSetHoldability, final StatementType statementType) {
return new PStmtKey(normalizeSQL(sql), getCatalogOrNull(), getSchemaOrNull(), resultSetType,
resultSetConcurrency, resultSetHoldability, statementType);
}
/**
* Creates a {@link PStmtKey} for the given arguments.
*
* @param sql
* The SQL statement.
* @param resultSetType
* A result set type; one of ResultSet.TYPE_FORWARD_ONLY,
* ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE.
* @param resultSetConcurrency
* A concurrency type; one of ResultSet.CONCUR_READ_ONLY or
* ResultSet.CONCUR_UPDATABLE.
* @param statementType
* The SQL statement type, prepared or callable.
* @return a key to uniquely identify a prepared statement.
* @since 2.4.0
*/
protected PStmtKey createKey(final String sql, final int resultSetType, final int resultSetConcurrency,
final StatementType statementType) {
return new PStmtKey(normalizeSQL(sql), getCatalogOrNull(), getSchemaOrNull(), resultSetType,
resultSetConcurrency, statementType);
}
/**
* Creates a {@link PStmtKey} for the given arguments.
*
* @param sql
* The SQL statement.
* @param statementType
* The SQL statement type, prepared or callable.
* @return a key to uniquely identify a prepared statement.
*/
protected PStmtKey createKey(final String sql, final StatementType statementType) {
return new PStmtKey(normalizeSQL(sql), getCatalogOrNull(), getSchemaOrNull(), statementType);
}
/**
* Creates a {@link PStmtKey} for the given arguments.
*
* @param sql
* The SQL statement.
* @param columnNames
* An array of column names indicating the columns that should be returned from the inserted row or rows.
* @return a key to uniquely identify a prepared statement.
*/
protected PStmtKey createKey(final String sql, final String columnNames[]) {
return new PStmtKey(normalizeSQL(sql), getCatalogOrNull(), getSchemaOrNull(), columnNames);
}
/**
* My {@link KeyedPooledObjectFactory} method for destroying {@link PreparedStatement}s.
*
* @param key
* ignored
* @param pooledObject
* the wrapped {@link PreparedStatement} to be destroyed.
*/
@Override
public void destroyObject(final PStmtKey key, final PooledObject pooledObject)
throws Exception {
pooledObject.getObject().getInnermostDelegate().close();
}
/**
* Closes the physical connection and checks that the logical connection was closed as well.
*/
@Override
protected void finalize() throws Throwable {
// Closing the Connection ensures that if anyone tries to use it,
// an error will occur.
try {
connection.close();
} catch (final Exception ignored) {
// ignore
}
// make sure the last connection is marked as closed
if (logicalConnection != null && !logicalConnection.isClosed()) {
throw new SQLException("PooledConnection was gc'ed, without its last Connection being closed.");
}
}
private String getCatalogOrNull() {
try {
return connection == null ? null : connection.getCatalog();
} catch (final SQLException e) {
return null;
}
}
private String getSchemaOrNull() {
try {
return connection == null ? null : Jdbc41Bridge.getSchema(connection);
} catch (final SQLException e) {
return null;
}
}
/**
* Returns a JDBC connection.
*
* @return The database connection.
* @throws SQLException
* if the connection is not open or the previous logical connection is still open
*/
@Override
public Connection getConnection() throws SQLException {
assertOpen();
// make sure the last connection is marked as closed
if (logicalConnection != null && !logicalConnection.isClosed()) {
// should notify pool of error so the pooled connection can
// be removed !FIXME!
throw new SQLException("PooledConnection was reused, without its previous Connection being closed.");
}
// the spec requires that this return a new Connection instance.
logicalConnection = new ConnectionImpl(this, connection, isAccessToUnderlyingConnectionAllowed());
return logicalConnection;
}
/**
* Returns the value of the accessToUnderlyingConnectionAllowed property.
*
* @return true if access to the underlying is allowed, false otherwise.
*/
public synchronized boolean isAccessToUnderlyingConnectionAllowed() {
return this.accessToUnderlyingConnectionAllowed;
}
/**
* My {@link KeyedPooledObjectFactory} method for creating {@link PreparedStatement}s.
*
* @param key
* The key for the {@link PreparedStatement} to be created.
*/
@SuppressWarnings("resource")
@Override
public PooledObject makeObject(final PStmtKey key) throws Exception {
if (null == key) {
throw new IllegalArgumentException("Prepared statement key is null or invalid.");
}
if (key.getStmtType() == StatementType.PREPARED_STATEMENT) {
final PreparedStatement statement = (PreparedStatement) key.createStatement(connection);
@SuppressWarnings({"rawtypes", "unchecked" }) // Unable to find way to avoid this
final PoolablePreparedStatement pps = new PoolablePreparedStatement(statement, key, pStmtPool,
delegatingConnection);
return new DefaultPooledObject<>(pps);
}
final CallableStatement statement = (CallableStatement) key.createStatement(connection);
@SuppressWarnings("unchecked")
final PoolableCallableStatement pcs = new PoolableCallableStatement(statement, key, pStmtPool,
(DelegatingConnection) delegatingConnection);
return new DefaultPooledObject<>(pcs);
}
/**
* Normalizes the given SQL statement, producing a canonical form that is semantically equivalent to the original.
* @param sql
* The SQL statement.
* @return the normalized SQL statement.
*/
protected String normalizeSQL(final String sql) {
return sql.trim();
}
/**
* Sends a connectionClosed event.
*/
void notifyListeners() {
final ConnectionEvent event = new ConnectionEvent(this);
final Object[] listeners = eventListeners.toArray();
for (final Object listener : listeners) {
((ConnectionEventListener) listener).connectionClosed(event);
}
}
/**
* My {@link KeyedPooledObjectFactory} method for passivating {@link PreparedStatement}s. Currently invokes
* {@link PreparedStatement#clearParameters}.
*
* @param key
* ignored
* @param pooledObject
* a wrapped {@link PreparedStatement}
*/
@Override
public void passivateObject(final PStmtKey key, final PooledObject pooledObject)
throws Exception {
@SuppressWarnings("resource")
final DelegatingPreparedStatement dps = pooledObject.getObject();
dps.clearParameters();
dps.passivate();
}
/**
* Creates or obtains a {@link CallableStatement} from my pool.
*
* @param sql
* an SQL statement that may contain one or more '?' parameter placeholders. Typically this statement is
* specified using JDBC call escape syntax.
* @return a default CallableStatement object containing the pre-compiled SQL statement.
* @exception SQLException
* Thrown if a database access error occurs or this method is called on a closed connection.
* @since 2.4.0
*/
CallableStatement prepareCall(final String sql) throws SQLException {
if (pStmtPool == null) {
return connection.prepareCall(sql);
}
try {
return (CallableStatement) pStmtPool.borrowObject(createKey(sql, StatementType.CALLABLE_STATEMENT));
} catch (final RuntimeException e) {
throw e;
} catch (final Exception e) {
throw new SQLException("Borrow prepareCall from pool failed", e);
}
}
/**
* Creates or obtains a {@link CallableStatement} from my pool.
*
* @param sql
* a String object that is the SQL statement to be sent to the database; may contain on or
* more '?' parameters.
* @param resultSetType
* a result set type; one of ResultSet.TYPE_FORWARD_ONLY,
* ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE.
* @param resultSetConcurrency
* a concurrency type; one of ResultSet.CONCUR_READ_ONLY or
* ResultSet.CONCUR_UPDATABLE.
* @return a CallableStatement object containing the pre-compiled SQL statement that will produce
* ResultSet objects with the given type and concurrency.
* @throws SQLException
* Thrown if a database access error occurs, this method is called on a closed connection or the given
* parameters are not ResultSet constants indicating type and concurrency.
* @since 2.4.0
*/
CallableStatement prepareCall(final String sql, final int resultSetType, final int resultSetConcurrency)
throws SQLException {
if (pStmtPool == null) {
return connection.prepareCall(sql, resultSetType, resultSetConcurrency);
}
try {
return (CallableStatement) pStmtPool.borrowObject(
createKey(sql, resultSetType, resultSetConcurrency, StatementType.CALLABLE_STATEMENT));
} catch (final RuntimeException e) {
throw e;
} catch (final Exception e) {
throw new SQLException("Borrow prepareCall from pool failed", e);
}
}
/**
* Creates or obtains a {@link CallableStatement} from my pool.
*
* @param sql
* a String object that is the SQL statement to be sent to the database; may contain on or
* more '?' parameters.
* @param resultSetType
* one of the following ResultSet constants: ResultSet.TYPE_FORWARD_ONLY,
* ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE.
* @param resultSetConcurrency
* one of the following ResultSet constants: ResultSet.CONCUR_READ_ONLY or
* ResultSet.CONCUR_UPDATABLE.
* @param resultSetHoldability
* one of the following ResultSet constants: ResultSet.HOLD_CURSORS_OVER_COMMIT
* or ResultSet.CLOSE_CURSORS_AT_COMMIT.
* @return a new CallableStatement object, containing the pre-compiled SQL statement, that will
* generate ResultSet objects with the given type, concurrency, and holdability.
* @throws SQLException
* Thrown if a database access error occurs, this method is called on a closed connection or the given
* parameters are not ResultSet constants indicating type, concurrency, and holdability.
* @since 2.4.0
*/
CallableStatement prepareCall(final String sql, final int resultSetType, final int resultSetConcurrency,
final int resultSetHoldability) throws SQLException {
if (pStmtPool == null) {
return connection.prepareCall(sql, resultSetType, resultSetConcurrency, resultSetHoldability);
}
try {
return (CallableStatement) pStmtPool.borrowObject(createKey(sql, resultSetType, resultSetConcurrency,
resultSetHoldability, StatementType.CALLABLE_STATEMENT));
} catch (final RuntimeException e) {
throw e;
} catch (final Exception e) {
throw new SQLException("Borrow prepareCall from pool failed", e);
}
}
/**
* Creates or obtains a {@link PreparedStatement} from my pool.
*
* @param sql
* the SQL statement.
* @return a {@link PoolablePreparedStatement}
*/
PreparedStatement prepareStatement(final String sql) throws SQLException {
if (pStmtPool == null) {
return connection.prepareStatement(sql);
}
try {
return pStmtPool.borrowObject(createKey(sql));
} catch (final RuntimeException e) {
throw e;
} catch (final Exception e) {
throw new SQLException("Borrow prepareStatement from pool failed", e);
}
}
/**
* Creates or obtains a {@link PreparedStatement} from my pool.
*
* @param sql
* an SQL statement that may contain one or more '?' IN parameter placeholders.
* @param autoGeneratedKeys
* a flag indicating whether auto-generated keys should be returned; one of
* Statement.RETURN_GENERATED_KEYS or Statement.NO_GENERATED_KEYS.
* @return a {@link PoolablePreparedStatement}
* @see Connection#prepareStatement(String, int)
*/
PreparedStatement prepareStatement(final String sql, final int autoGeneratedKeys) throws SQLException {
if (pStmtPool == null) {
return connection.prepareStatement(sql, autoGeneratedKeys);
}
try {
return pStmtPool.borrowObject(createKey(sql, autoGeneratedKeys));
} catch (final RuntimeException e) {
throw e;
} catch (final Exception e) {
throw new SQLException("Borrow prepareStatement from pool failed", e);
}
}
PreparedStatement prepareStatement(final String sql, final int columnIndexes[]) throws SQLException {
if (pStmtPool == null) {
return connection.prepareStatement(sql, columnIndexes);
}
try {
return pStmtPool.borrowObject(createKey(sql, columnIndexes));
} catch (final RuntimeException e) {
throw e;
} catch (final Exception e) {
throw new SQLException("Borrow prepareStatement from pool failed", e);
}
}
/**
* Creates or obtains a {@link PreparedStatement} from my pool.
*
* @param sql
* a String object that is the SQL statement to be sent to the database; may contain one or
* more '?' IN parameters.
* @param resultSetType
* a result set type; one of ResultSet.TYPE_FORWARD_ONLY,
* ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE.
* @param resultSetConcurrency
* a concurrency type; one of ResultSet.CONCUR_READ_ONLY or
* ResultSet.CONCUR_UPDATABLE.
*
* @return a {@link PoolablePreparedStatement}.
* @see Connection#prepareStatement(String, int, int)
*/
PreparedStatement prepareStatement(final String sql, final int resultSetType, final int resultSetConcurrency)
throws SQLException {
if (pStmtPool == null) {
return connection.prepareStatement(sql, resultSetType, resultSetConcurrency);
}
try {
return pStmtPool.borrowObject(createKey(sql, resultSetType, resultSetConcurrency));
} catch (final RuntimeException e) {
throw e;
} catch (final Exception e) {
throw new SQLException("Borrow prepareStatement from pool failed", e);
}
}
PreparedStatement prepareStatement(final String sql, final int resultSetType, final int resultSetConcurrency,
final int resultSetHoldability) throws SQLException {
if (pStmtPool == null) {
return connection.prepareStatement(sql, resultSetType, resultSetConcurrency, resultSetHoldability);
}
try {
return pStmtPool.borrowObject(createKey(sql, resultSetType, resultSetConcurrency, resultSetHoldability));
} catch (final RuntimeException e) {
throw e;
} catch (final Exception e) {
throw new SQLException("Borrow prepareStatement from pool failed", e);
}
}
PreparedStatement prepareStatement(final String sql, final String columnNames[]) throws SQLException {
if (pStmtPool == null) {
return connection.prepareStatement(sql, columnNames);
}
try {
return pStmtPool.borrowObject(createKey(sql, columnNames));
} catch (final RuntimeException e) {
throw e;
} catch (final Exception e) {
throw new SQLException("Borrow prepareStatement from pool failed", e);
}
}
/**
* {@inheritDoc}
*/
@Override
public void removeConnectionEventListener(final ConnectionEventListener listener) {
eventListeners.remove(listener);
}
/* JDBC_4_ANT_KEY_BEGIN */
@Override
public void removeStatementEventListener(final StatementEventListener listener) {
statementEventListeners.remove(listener);
}
/* JDBC_4_ANT_KEY_END */
/**
* Sets the value of the accessToUnderlyingConnectionAllowed property. It controls if the PoolGuard allows access to
* the underlying connection. (Default: false.)
*
* @param allow
* Access to the underlying connection is granted when true.
*/
public synchronized void setAccessToUnderlyingConnectionAllowed(final boolean allow) {
this.accessToUnderlyingConnectionAllowed = allow;
}
public void setStatementPool(final KeyedObjectPool statementPool) {
pStmtPool = statementPool;
}
/**
* My {@link KeyedPooledObjectFactory} method for validating {@link PreparedStatement}s.
*
* @param key
* Ignored.
* @param pooledObject
* Ignored.
* @return {@code true}
*/
@Override
public boolean validateObject(final PStmtKey key, final PooledObject pooledObject) {
return true;
}
/**
* @since 2.6.0
*/
@Override
public synchronized String toString() {
final StringBuilder builder = new StringBuilder(super.toString());
builder.append("[connection=");
builder.append(connection);
builder.append(", delegatingConnection=");
builder.append(delegatingConnection);
builder.append(", logicalConnection=");
builder.append(logicalConnection);
builder.append(", eventListeners=");
builder.append(eventListeners);
builder.append(", statementEventListeners=");
builder.append(statementEventListeners);
builder.append(", closed=");
builder.append(closed);
builder.append(", pStmtPool=");
builder.append(pStmtPool);
builder.append(", accessToUnderlyingConnectionAllowed=");
builder.append(accessToUnderlyingConnectionAllowed);
builder.append("]");
return builder.toString();
}
}