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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.datasources;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.concurrent.ConcurrentHashMap;
import javax.naming.Context;
import javax.naming.Name;
import javax.naming.RefAddr;
import javax.naming.Reference;
import javax.naming.spi.ObjectFactory;
/**
* A JNDI ObjectFactory which creates SharedPoolDataSources
* or PerUserPoolDataSources
*
* @since 2.0
*/
abstract class InstanceKeyDataSourceFactory implements ObjectFactory {
private static final Map instanceMap =
new ConcurrentHashMap<>();
static synchronized String registerNewInstance(final InstanceKeyDataSource ds) {
int max = 0;
final Iterator i = instanceMap.keySet().iterator();
while (i.hasNext()) {
final String s = i.next();
if (s != null) {
try {
max = Math.max(max, Integer.parseInt(s));
} catch (final NumberFormatException e) {
// no sweat, ignore those keys
}
}
}
final String instanceKey = String.valueOf(max + 1);
// put a placeholder here for now, so other instances will not
// take our key. we will replace with a pool when ready.
instanceMap.put(instanceKey, ds);
return instanceKey;
}
static void removeInstance(final String key) {
if (key != null) {
instanceMap.remove(key);
}
}
/**
* Close all pools associated with this class.
*/
public static void closeAll() throws Exception {
//Get iterator to loop over all instances of this datasource.
final Iterator> instanceIterator =
instanceMap.entrySet().iterator();
while (instanceIterator.hasNext()) {
instanceIterator.next().getValue().close();
}
instanceMap.clear();
}
/**
* implements ObjectFactory to create an instance of SharedPoolDataSource
* or PerUserPoolDataSource
*/
@Override
public Object getObjectInstance(final Object refObj, final Name name,
final Context context, final Hashtable env)
throws IOException, ClassNotFoundException {
// The spec says to return null if we can't create an instance
// of the reference
Object obj = null;
if (refObj instanceof Reference) {
final Reference ref = (Reference) refObj;
if (isCorrectClass(ref.getClassName())) {
final RefAddr ra = ref.get("instanceKey");
if (ra != null && ra.getContent() != null) {
// object was bound to jndi via Referenceable api.
obj = instanceMap.get(ra.getContent());
}
else
{
// tomcat jndi creates a Reference out of server.xml
// configuration and passes it to an
// instance of the factory given in server.xml.
String key = null;
if (name != null)
{
key = name.toString();
obj = instanceMap.get(key);
}
if (obj == null)
{
final InstanceKeyDataSource ds = getNewInstance(ref);
setCommonProperties(ref, ds);
obj = ds;
if (key != null)
{
instanceMap.put(key, ds);
}
}
}
}
}
return obj;
}
private void setCommonProperties(final Reference ref,
final InstanceKeyDataSource ikds)
throws IOException, ClassNotFoundException {
RefAddr ra = ref.get("dataSourceName");
if (ra != null && ra.getContent() != null) {
ikds.setDataSourceName(ra.getContent().toString());
}
ra = ref.get("description");
if (ra != null && ra.getContent() != null) {
ikds.setDescription(ra.getContent().toString());
}
ra = ref.get("jndiEnvironment");
if (ra != null && ra.getContent() != null) {
final byte[] serialized = (byte[]) ra.getContent();
ikds.setJndiEnvironment((Properties) deserialize(serialized));
}
ra = ref.get("loginTimeout");
if (ra != null && ra.getContent() != null) {
ikds.setLoginTimeout(
Integer.parseInt(ra.getContent().toString()));
}
// Pool properties
ra = ref.get("blockWhenExhausted");
if (ra != null && ra.getContent() != null) {
ikds.setDefaultBlockWhenExhausted(Boolean.valueOf(
ra.getContent().toString()).booleanValue());
}
ra = ref.get("evictionPolicyClassName");
if (ra != null && ra.getContent() != null) {
ikds.setDefaultEvictionPolicyClassName(ra.getContent().toString());
}
// Pool properties
ra = ref.get("lifo");
if (ra != null && ra.getContent() != null) {
ikds.setDefaultLifo(Boolean.valueOf(
ra.getContent().toString()).booleanValue());
}
ra = ref.get("maxIdlePerKey");
if (ra != null && ra.getContent() != null) {
ikds.setDefaultMaxIdle(
Integer.parseInt(ra.getContent().toString()));
}
ra = ref.get("maxTotalPerKey");
if (ra != null && ra.getContent() != null) {
ikds.setDefaultMaxTotal(
Integer.parseInt(ra.getContent().toString()));
}
ra = ref.get("maxWaitMillis");
if (ra != null && ra.getContent() != null) {
ikds.setDefaultMaxWaitMillis(
Long.parseLong(ra.getContent().toString()));
}
ra = ref.get("minEvictableIdleTimeMillis");
if (ra != null && ra.getContent() != null) {
ikds.setDefaultMinEvictableIdleTimeMillis(
Long.parseLong(ra.getContent().toString()));
}
ra = ref.get("minIdlePerKey");
if (ra != null && ra.getContent() != null) {
ikds.setDefaultMinIdle(
Integer.parseInt(ra.getContent().toString()));
}
ra = ref.get("numTestsPerEvictionRun");
if (ra != null && ra.getContent() != null) {
ikds.setDefaultNumTestsPerEvictionRun(
Integer.parseInt(ra.getContent().toString()));
}
ra = ref.get("softMinEvictableIdleTimeMillis");
if (ra != null && ra.getContent() != null) {
ikds.setDefaultSoftMinEvictableIdleTimeMillis(
Long.parseLong(ra.getContent().toString()));
}
ra = ref.get("testOnCreate");
if (ra != null && ra.getContent() != null) {
ikds.setDefaultTestOnCreate(Boolean.valueOf(
ra.getContent().toString()).booleanValue());
}
ra = ref.get("testOnBorrow");
if (ra != null && ra.getContent() != null) {
ikds.setDefaultTestOnBorrow(Boolean.valueOf(
ra.getContent().toString()).booleanValue());
}
ra = ref.get("testOnReturn");
if (ra != null && ra.getContent() != null) {
ikds.setDefaultTestOnReturn(Boolean.valueOf(
ra.getContent().toString()).booleanValue());
}
ra = ref.get("testWhileIdle");
if (ra != null && ra.getContent() != null) {
ikds.setDefaultTestWhileIdle(Boolean.valueOf(
ra.getContent().toString()).booleanValue());
}
ra = ref.get("timeBetweenEvictionRunsMillis");
if (ra != null && ra.getContent() != null) {
ikds.setDefaultTimeBetweenEvictionRunsMillis(
Long.parseLong(ra.getContent().toString()));
}
// Connection factory properties
ra = ref.get("validationQuery");
if (ra != null && ra.getContent() != null) {
ikds.setValidationQuery(ra.getContent().toString());
}
ra = ref.get("validationQueryTimeout");
if (ra != null && ra.getContent() != null) {
ikds.setValidationQueryTimeout(Integer.parseInt(
ra.getContent().toString()));
}
ra = ref.get("rollbackAfterValidation");
if (ra != null && ra.getContent() != null) {
ikds.setRollbackAfterValidation(Boolean.valueOf(
ra.getContent().toString()).booleanValue());
}
ra = ref.get("maxConnLifetimeMillis");
if (ra != null && ra.getContent() != null) {
ikds.setMaxConnLifetimeMillis(
Long.parseLong(ra.getContent().toString()));
}
// Connection properties
ra = ref.get("defaultAutoCommit");
if (ra != null && ra.getContent() != null) {
ikds.setDefaultAutoCommit(Boolean.valueOf(ra.getContent().toString()));
}
ra = ref.get("defaultTransactionIsolation");
if (ra != null && ra.getContent() != null) {
ikds.setDefaultTransactionIsolation(
Integer.parseInt(ra.getContent().toString()));
}
ra = ref.get("defaultReadOnly");
if (ra != null && ra.getContent() != null) {
ikds.setDefaultReadOnly(Boolean.valueOf(ra.getContent().toString()));
}
}
/**
* @return true if and only if className is the value returned
* from getClass().getName().toString()
*/
protected abstract boolean isCorrectClass(String className);
/**
* Creates an instance of the subclass and sets any properties
* contained in the Reference.
*/
protected abstract InstanceKeyDataSource getNewInstance(Reference ref)
throws IOException, ClassNotFoundException;
/**
* used to set some properties saved within a Reference
*/
protected static final Object deserialize(final byte[] data)
throws IOException, ClassNotFoundException {
ObjectInputStream in = null;
try {
in = new ObjectInputStream(new ByteArrayInputStream(data));
return in.readObject();
} finally {
if (in != null) {
try {
in.close();
} catch (final IOException ex) {
}
}
}
}
}