CDI - 事件观察者
我有事件观察者，它们都观察相同的事件，所以我有一个抽象超类，它观察该事件，然后子类覆盖/实现特定功能。
这样做的问题是，除非我将事件观察者方法放在子类中，否则它不会观察事件（这违背了我的设计目的）。
我当然可以这样做，但我想编写尽可能少的代码。
它应该这样工作吗（我做错了什么吗）？
如果它不应该以这种方式工作，那么我可以为一件事编写一个生产者，然后编写一个拦截器。我认为我的第一种方法更简单，并且更有可能被其他开发人员正确使用。
示例代码：
SuperClass:
public abstract class AbstractFileWriter
{
public void onReady(@Observes ReadyEvent readyEvent)
{
try
{
handleReady(readyEvent, ...);
}
}
protected abstract handleReady(ReadyEvent readyEvent, otherParameters go here);
}
SubClass
public class XmlWriter extends AbstractFileWriter
{
protected handleReady( ... )
{ ... }
}
如果我这样写，则永远不会调用handleReady（并且 onReady 也不会调用）；但是，如果我在子类中使用观察者方法编写它，它会按预期工作。我想以这种方式编写它，因为我需要编写的代码要少得多，抽象也少一点，这应该使它更容易理解。
沃尔特
I have event observers which all observe the same event, so I have an abstract superclass which observes that event and then the subclass overrides / implements the specific functionality.
The problem with this is that it doesn't observe the event unless I put the event observer method in the subclass (which defeats the purpose of my design).
I can most certainly do it this way, but I want to write as little code as possible.
Should it work this way (am I doing something else wrong)?
If it isn't supposed to work this way, then I can write a producer for one thing and then an interceptor. I thought that my first approach was simpler and more likely to be used properly by other developers.
example code:
SuperClass:
public abstract class AbstractFileWriter
{
public void onReady(@Observes ReadyEvent readyEvent)
{
try
{
handleReady(readyEvent, ...);
}
}
protected abstract handleReady(ReadyEvent readyEvent, otherParameters go here);
}
SubClass
public class XmlWriter extends AbstractFileWriter
{
protected handleReady( ... )
{ ... }
}
If I write it this way, handleReady is never invoked (and neither is onReady for that matter); however, if I write it with the observer method within the subclass, it works as expected. I want to write it this way as there is much less code I'd have to write and a little bit less abstraction which should make it easier to understand.
Walter
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要么将超类中的相关方法声明为抽象方法，要么让它调用每个子类实现的抽象“详细”方法。
Either declare the relevant method in the superclass to be abstract or have it call an abstract "detail" method that each subclass implements.
正如我上面提到的，我写了一个装饰器。这本质上是做同样的事情，只是写法略有不同。
沃尔特
I wrote a decorator as I mentioned above. This essentially does the same thing, just written slightly differently.
Walter