Spring Cloud学习笔记（Hystrix）：execute，queue，observe，toObservable样例和特性

import com.netflix.hystrix.HystrixCommand;
import com.netflix.hystrix.HystrixCommandGroupKey;
import rx.Observable;
 
public class CommandHelloWorld extends HystrixCommand<String> {
    private final String name;
 
    protected CommandHelloWorld(String name) {
        super(Setter.withGroupKey(HystrixCommandGroupKey.Factory.asKey("ExampleGroup")));
        this.name = name;
    }
 
    @Override
    protected String run() {
        return "Hello " + name + "!";
    }
 
    @Override
    protected String getFallback() {
        return "Hello Fallback!";
    }
 
    // 同步执行
    public static void main(String[] args) {
        CommandHelloWorld command = new CommandHelloWorld("World");
        String result = command.execute(); // 执行命令，同步阻塞
        System.out.println(result);
    }
}

这个例子展示了如何使用HystrixCommand的execute方法来同步执行命令，并处理了回退逻辑。execute方法在请求失败或线程被阻塞时调用回退逻辑。