/*
* Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com
* The software in this package is published under the terms of the CPAL v1.0
* license, a copy of which has been included with this distribution in the
* LICENSE.txt file.
*/
package org.mule.runtime.core.util.pool;
import org.mule.runtime.api.config.PoolingProfile;
import org.mule.runtime.core.api.MuleContext;
import org.mule.runtime.api.lifecycle.Disposable;
import org.mule.runtime.api.lifecycle.InitialisationException;
import org.mule.runtime.core.api.object.ObjectFactory;
import org.mule.runtime.api.i18n.I18nMessageFactory;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.pool.PoolableObjectFactory;
import org.apache.commons.pool.impl.GenericObjectPool;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* <code>CommonsPoolProxyPool</code> is an implementation of {@link ObjectPool} that internally uses the commons-pool
* {@link GenericObjectPool} and uses a {@link ObjectFactory} for creating new pooled instances.
*/
public class CommonsPoolObjectPool implements ObjectPool {
/**
* logger used by this class
*/
protected static final Logger logger = LoggerFactory.getLogger(CommonsPoolObjectPool.class);
/**
* The pool
*/
protected GenericObjectPool pool;
/**
* The ObjectFactory used to create new pool instances
*/
protected ObjectFactory objectFactory;
/**
* The pooling profile used to configure and initialise pool
*/
protected PoolingProfile poolingProfile;
protected MuleContext muleContext;
/**
* Creates a new pool and an Object factory with the ServiceDescriptor
*/
public CommonsPoolObjectPool(ObjectFactory objectFactory, PoolingProfile poolingProfile, MuleContext muleContext) {
this.objectFactory = objectFactory;
this.poolingProfile = poolingProfile;
this.muleContext = muleContext;
}
public void initialise() throws InitialisationException {
GenericObjectPool.Config config = new GenericObjectPool.Config();
if (poolingProfile != null) {
config.maxIdle = poolingProfile.getMaxIdle();
config.maxActive = poolingProfile.getMaxActive();
config.maxWait = poolingProfile.getMaxWait();
config.whenExhaustedAction = (byte) poolingProfile.getExhaustedAction();
config.minEvictableIdleTimeMillis = poolingProfile.getMinEvictionMillis();
config.timeBetweenEvictionRunsMillis = poolingProfile.getEvictionCheckIntervalMillis();
}
pool = new GenericObjectPool(getPooledObjectFactory(), config);
try {
applyInitialisationPolicy();
} catch (Exception e) {
throw new InitialisationException(e, this);
}
}
/**
* Template method to be overridden by implementations that do more than just invoke objectFactory
*/
protected PoolableObjectFactory getPooledObjectFactory() {
return new PoolabeObjectFactoryAdapter();
}
protected void applyInitialisationPolicy() throws Exception {
if (poolingProfile != null) {
int numToBorrow = 0;
int initPolicy = poolingProfile.getInitialisationPolicy();
if (initPolicy == PoolingProfile.INITIALISE_ALL) {
numToBorrow = poolingProfile.getMaxActive();
} else if (initPolicy == PoolingProfile.INITIALISE_ONE) {
numToBorrow = 1;
}
List<Object> holderList = new ArrayList<Object>(numToBorrow);
try {
for (int t = 0; t < numToBorrow; t++) {
holderList.add(getPooledObjectFactory().makeObject());
}
} finally {
for (int t = 0; t < holderList.size(); t++) {
Object obj = holderList.get(t);
if (obj != null) {
this.returnObject(obj);
}
}
}
}
}
public Object borrowObject() throws Exception {
if (pool != null) {
return pool.borrowObject();
} else {
throw new InitialisationException(I18nMessageFactory.createStaticMessage("Object pool has not been initialized."), this);
}
}
public void returnObject(Object object) {
if (pool != null) {
try {
pool.returnObject(object);
} catch (Exception ex) {
// declared Exception is never thrown from pool; this is a known bug
// in the pool API
}
}
}
public int getNumActive() {
return pool.getNumActive();
}
public int getMaxActive() {
return pool.getMaxActive();
}
public void dispose() {
if (pool != null) {
try {
pool.close();
} catch (Exception e) {
// close() never throws - wrong method signature
} finally {
pool = null;
}
}
}
public void clear() {
if (pool != null) {
pool.clear();
}
}
public void close() {
if (pool != null) {
try {
pool.close();
} catch (Exception e) {
// close() never throws - wrong method signature
} finally {
pool = null;
}
}
}
public void setObjectFactory(ObjectFactory objectFactory) {
this.objectFactory = objectFactory;
}
public ObjectFactory getObjectFactory() {
return objectFactory;
}
/**
* Wraps org.mule.runtime.core.object.ObjectFactory with commons-pool PoolableObjectFactory
*/
class PoolabeObjectFactoryAdapter implements PoolableObjectFactory {
public void activateObject(Object obj) throws Exception {
// nothing to do
}
public void destroyObject(Object obj) throws Exception {
if (obj instanceof Disposable) {
((Disposable) obj).dispose();
}
}
public Object makeObject() throws Exception {
return objectFactory.getInstance(muleContext);
}
public void passivateObject(Object obj) throws Exception {
// nothing to do
}
public boolean validateObject(Object obj) {
return true;
}
}
}