org.camunda.bpm.engine.spring.components.aop.ProcessStartAnnotationBeanPostProcessor.java Source code

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Here is the source code for org.camunda.bpm.engine.spring.components.aop.ProcessStartAnnotationBeanPostProcessor.java

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/*
 * Copyright 2010 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.camunda.bpm.engine.spring.components.aop;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.camunda.bpm.engine.ProcessEngine;
import org.camunda.bpm.engine.spring.annotations.ProcessVariable;
import org.camunda.bpm.engine.spring.annotations.StartProcess;
import org.springframework.aop.framework.Advised;
import org.springframework.aop.framework.AopInfrastructureBean;
import org.springframework.aop.framework.ProxyConfig;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.aop.support.AopUtils;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.util.ClassUtils;

/**
 * Proxies beans with methods annotated with {@link StartProcess}.
 * If the method is invoked successfully, the process described by the annotaton is created.
 * Parameters passed to the method annotated with {@link ProcessVariable}
 * are passed to the business process.
 *
 * @author Josh Long
 * @since 5,3
 */
public class ProcessStartAnnotationBeanPostProcessor extends ProxyConfig
        implements BeanPostProcessor, InitializingBean {

    private Log log = LogFactory.getLog(getClass());

    /**
     * the process engine as created by a {@link org.camunda.bpm.engine.spring.ProcessEngineFactoryBean}
     */
    private ProcessEngine processEngine;

    private ProcessStartingPointcutAdvisor advisor;

    private volatile ClassLoader beanClassLoader = ClassUtils.getDefaultClassLoader();

    public void setProcessEngine(ProcessEngine processEngine) {
        this.processEngine = processEngine;
    }

    public void afterPropertiesSet() throws Exception {
        this.advisor = new ProcessStartingPointcutAdvisor(this.processEngine);
    }

    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        if (bean instanceof AopInfrastructureBean) {
            // Ignore AOP infrastructure such as scoped proxies.
            return bean;
        }
        Class<?> targetClass = AopUtils.getTargetClass(bean);
        if (AopUtils.canApply(this.advisor, targetClass)) {
            if (bean instanceof Advised) {
                ((Advised) bean).addAdvisor(0, this.advisor);
                return bean;
            } else {
                ProxyFactory proxyFactory = new ProxyFactory(bean);
                // Copy our properties (proxyTargetClass etc) inherited from ProxyConfig.
                proxyFactory.copyFrom(this);
                proxyFactory.addAdvisor(this.advisor);
                return proxyFactory.getProxy(this.beanClassLoader);
            }
        } else {
            // No async proxy needed.
            return bean;
        }
    }

    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        return bean;
    }
}