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/*
 * Copyright 2002-2007 the original author or authors.
 *
 * Licensed 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.springframework.aop.target;

import org.springframework.aop.support.DefaultIntroductionAdvisor;
import org.springframework.aop.support.DelegatingIntroductionInterceptor;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanInitializationException;
import org.springframework.beans.factory.DisposableBean;

/**
 * Abstract base class for pooling {@link org.springframework.aop.TargetSource}
 * implementations which maintain a pool of target instances, acquiring and
 * releasing a target object from the pool for each method invocation.
 * This abstract base class is independent of concrete pooling technology;
 * see the subclass {@link CommonsPoolTargetSource} for a concrete example.
 *
 * 

Subclasses must implement the {@link #getTarget} and * {@link #releaseTarget} methods based on their chosen object pool. * The {@link #newPrototypeInstance()} method inherited from * {@link AbstractPrototypeBasedTargetSource} can be used to create objects * in order to put them into the pool. * *

Subclasses must also implement some of the monitoring methods from the * {@link PoolingConfig} interface. The {@link #getPoolingConfigMixin()} method * makes these stats available on proxied objects through an IntroductionAdvisor. * *

This class implements the {@link org.springframework.beans.factory.DisposableBean} * interface in order to force subclasses to implement a {@link #destroy()} * method, closing down their object pool. * * @author Rod Johnson * @author Juergen Hoeller * @see #getTarget * @see #releaseTarget * @see #destroy */ public abstract class AbstractPoolingTargetSource extends AbstractPrototypeBasedTargetSource implements PoolingConfig, DisposableBean { /** The maximum size of the pool */ private int maxSize = -1; /** * Set the maximum size of the pool. * Default is -1, indicating no size limit. */ public void setMaxSize(int maxSize) { this.maxSize = maxSize; } /** * Return the maximum size of the pool. */ public int getMaxSize() { return this.maxSize; } public final void setBeanFactory(BeanFactory beanFactory) throws BeansException { super.setBeanFactory(beanFactory); try { createPool(); } catch (Throwable ex) { throw new BeanInitializationException("Could not create instance pool for TargetSource", ex); } } /** * Create the pool. * @throws Exception to avoid placing constraints on pooling APIs */ protected abstract void createPool() throws Exception; /** * Acquire an object from the pool. * @return an object from the pool * @throws Exception we may need to deal with checked exceptions from pool * APIs, so we're forgiving with our exception signature */ public abstract Object getTarget() throws Exception; /** * Return the given object to the pool. * @param target object that must have been acquired from the pool * via a call to getTarget() * @throws Exception to allow pooling APIs to throw exception * @see #getTarget */ public abstract void releaseTarget(Object target) throws Exception; /** * Return an IntroductionAdvisor that providing a mixin * exposing statistics about the pool maintained by this object. */ public DefaultIntroductionAdvisor getPoolingConfigMixin() { DelegatingIntroductionInterceptor dii = new DelegatingIntroductionInterceptor(this); return new DefaultIntroductionAdvisor(dii, PoolingConfig.class); } }





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