Disruptor技术调研之配置ExceptionHandler

1、举例：handleExceptionsWith设置

disruptor.handleExceptionsWith(exceptionHandler);
disruptor.handleEventsWith(handler);

2、举例：handleExceptionsWith方式设置需要在handler注册前设置

disruptor.handleExceptionsWith(exceptionHandler);
disruptor.handleEventsWith(handler);
disruptor.handleExceptionsWith(new FatalExceptionHandler());

注册handler时，通过获取Disruptor上下文中已经设置的exceptionHandler --->>

if (exceptionHandler != null)
{
    batchEventProcessor.setExceptionHandler(exceptionHandler);
}

3、举例：推荐使用setDefaultExceptionHandler方法设置exceptionHandler

disruptor.setDefaultExceptionHandler(exceptionHandler);
disruptor.handleEventsWith(handler);

--->>

private ExceptionHandler<? super T> exceptionHandler = new ExceptionHandlerWrapper<T>();

--->>

private ExceptionHandler<? super T> delegate = new FatalExceptionHandler();

public void switchTo(final ExceptionHandler<? super T> exceptionHandler)
{
    this.delegate = exceptionHandler;
}

4、举例：setDefaultExceptionHandler不同于handleExceptionsWith方法可以在handler注册后设置，原因是重新设置的exceptionHandler代理，见上述代码

disruptor.handleEventsWith(handler);
disruptor.setDefaultExceptionHandler(exceptionHandler);

5、举例：灵活设置

disruptor.handleEventsWith(eventHandler);

disruptor.handleExceptionsFor(eventHandler).with(exceptionHandler);

--->>

com.lmax.disruptor.dsl.ExceptionHandlerSetting<T>

A support class used as part of setting an exception handler for a specific event handler. For example:

disruptorWizard.handleExceptionsIn(eventHandler).with(exceptionHandler);
Type Parameters:
<T> the type of event being handled.