Java中完美实现C#的EventHandler事件模式,代码优雅解耦合
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hzEvents
A cSharp-like event model for java, decoupe code gracefully.
Java中完美实现C#的Event-EventHandler-EventArgs事件模式,代码优雅解耦合。
用法
Import cn.hz.Events.jar
in your project first, or import source code.
首先项目中引入cn.hz.Events.jar
包,或源码。
Subject
Class which supply events and fire events.
包含事件并触发事件的类。
public class Subject {
//Simple event
Event event1 = new Event();
//Event with arguments
Event2<String, Integer> eventWithArg = new Event2<>();
//Sample of removeListener
Event3<Subject, Integer, Integer> eventRemoved = new Event3<>();
public void start() {
// fire events at the appropriate time
onEvent1(new EventArgs());
onEvent2(new EventArgs2<>("Event2", 2));
onEvent3(new EventArgs3<>(this, 3, 3));
}
protected void onEvent1(EventArgs e) {
if (!event1.isEmpty()) {
event1.fire(this, e);
}
}
protected void onEvent2(EventArgs2<String, Integer> e) {
if (!eventWithArg.isEmpty()) {
eventWithArg.fire(this, e);
}
}
protected void onEvent3(EventArgs3<Subject, Integer, Integer> e) {
if (!eventRemoved.isEmpty()) {
eventRemoved.fire(this, e);
}
}
}
Observer
Class which subscribe events.
事件订阅者(或观察者).
public class Observer {
public void bindEvents(Subject subject, EventChain chain) {
// bind event listeners
subject.event1.addListener((o, e) -> {
System.out.println("event1 fired.");
});
subject.eventWithArg.addListener((o, e) -> {
System.out.println("eventWithArg fired, args: " + e.getData1() + "," + e.getData2());
});
chain.chainEvent.addListener((o, e) -> {
System.out.println("chainEvent fired, args: " + e.getData1() + "," + e.getData2());
});
EventHandler3<Subject, Integer, Integer> handler3 = this::onEvent3;
subject.eventRemoved.addListener(handler3);
//remove event binding. message of event3 will not be shown
subject.eventRemoved.removeListener(handler3); //Target must be exactly the same as addListener() !
}
private void onEvent3(Object o, EventArgs3<Subject, Integer, Integer> e) {
System.out.println("event3 fired, args: " + e.getData1() + "," + e.getData2() + "," + e.getData3());
}
}
详见源码(Source code):https://github.com/hzsrc/hzEv...
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