google的event 事件机制可以用于解耦，类似于spring的事件机制，可以同步也可以异步。
- 定时事件(类型随意，guava 调度的时候会根据对应的类型调对应的handler)
package google.event;
import lombok.AllArgsConstructor;
import lombok.Data;
@Data
@AllArgsConstructor
public class Event1 {
private String name;
private String tag;
}
----
package google.event;
import lombok.AllArgsConstructor;
import lombok.Data;
@Data
@AllArgsConstructor
public class Event2 {
private String name;
private String tag;
}- 定义事件处理器
处理器1：
package google.event;
import com.google.common.eventbus.Subscribe;
import org.example.PrintUtils;
public class Event1Handler {
@Subscribe
public void handleEvent(Event1 event) {
PrintUtils.printWithTime("Event1Handler ~~~~");
PrintUtils.printWithTime(event.toString());
}
}处理器2：
package google.event;
import com.google.common.eventbus.Subscribe;
import org.example.PrintUtils;
public class Event2Handler {
@Subscribe
public void handleEvent(Event2 event) {
PrintUtils.printWithTime("Event2Handler ~~~~");
PrintUtils.printWithTime(event.toString());
}
}- 测试类：
异步测试，同步消息总线发消息和接收消息都是main 线程
package google.event;
import com.google.common.eventbus.AsyncEventBus;
import com.google.common.eventbus.EventBus;
import java.util.concurrent.Executors;
public class Client {
public static void main(String[] args) {
// 同步
// EventBus eventBus = new EventBus();
// 异步，需要传入自己的线程池
EventBus eventBus = new AsyncEventBus(Executors.newFixedThreadPool(1));
Event1Handler event1Handler = new Event1Handler();
Event2Handler event2Handler = new Event2Handler();
eventBus.register(event1Handler);
eventBus.register(event2Handler);
eventBus.post(new Event1("Event1", "Event1"));
eventBus.post(new Event2("Event2", "Event2"));
}
}结果：
pool-1-thread-1 16:30:01 Event1Handler ~~~~
pool-1-thread-1 16:30:02 Event1(name=Event1, tag=Event1)
pool-1-thread-1 16:30:02 Event2Handler ~~~~
pool-1-thread-1 16:30:02 Event2(name=Event2, tag=Event2)【当你用心写完每一篇博客之后,你会发现它比你用代码实现功能更有成就感!】
