事件监听器 - 实现异步监听

异步监听代码实现：

public class AsyncApplicationEventMulticaster extends AbstractApplicationEventMulticaster {  
    private TaskExecutor taskExecutor = new SimpleAsyncTaskExecutor();  

    public void setTaskExecutor(TaskExecutor taskExecutor) {  
        this.taskExecutor = (taskExecutor != null ? taskExecutor : new SimpleAsyncTaskExecutor());  
    }  

    protected TaskExecutor getTaskExecutor() {  
        return this.taskExecutor;  
    }  

    @SuppressWarnings("unchecked")  
    public void multicastEvent(final ApplicationEvent event) {  
        for (Iterator<ApplicationListener> it = getApplicationListeners().iterator(); it.hasNext();) {  
            final ApplicationListener listener =  it.next();  
            getTaskExecutor().execute(new Runnable() {  
                public void run() {  
                    listener.onApplicationEvent(event);  
                }  
            });  
        }  
    }  
}  

将实现的异步监听器加入到Spring容器中：

@Bean(name = "applicationEventMulticaster")
public ApplicationEventMulticaster simpleApplicationEventMulticaster() {
    SimpleApplicationEventMulticaster eventMulticaster
            = new SimpleApplicationEventMulticaster();

    //ThreadPoolTaskExecutor
    eventMulticaster.setTaskExecutor(new SimpleAsyncTaskExecutor());
    return eventMulticaster;
}

记得多播器的beanName要取名为：applicationEventMulticaster。

End！

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