了解骆驼的进/出交换模式行为

Question

在骆驼中，说不是所有人都ENDPOINT支持是正确的INOUT ExchangePattern吗？
如果是，那么文档的哪一部分告诉哪个端点支持哪个ExchangePattern或这是一种隐含的知识。

由它ENDPOINT来支持INOUT。

下面是我得出结论的代码示例。

---

我正在玩骆驼示例-jms-file，我将其修改为

queue1 --> queue2 ---> file://test ---> file://test1

context.addRoutes(new RouteBuilder() {
        public void configure() {                         

            from("test-jms:queue:test.queue1")
            .process(sleep(1))
            .to("test-jms:queue:test.queue2");

            from("test-jms:queue:test.queue2")
            .process(sleep(2))
            .to("file://test");

            from("file://test")
            .process(sleep(3))
            .to("file://test1");
        }

        private Processor sleep(final int sleepId) {
            return new Processor() {                    
                @Override
                public void process(Exchange exchange) throws Exception {                       
                    System.out.println("Going for sleep sleepid=" + sleepId + ",  thread=" + Thread.currentThread().getName());
                    Thread.sleep(5000l);                        
                    System.out.println("Done sleep sleepid=" + sleepId + ",  thread=" + Thread.currentThread().getName());
                }
            };
        }
    });

然后我使用以下代码向队列发送消息：

        Exchange exchange = new DefaultExchange(context);
        exchange.setPattern(ExchangePattern.InOut);
        exchange.getIn().setBody("Test Message: 1");
  System.out.println("sending msg to queue1");
       Exchange send = template.send("test-jms:queue:test.queue1",exchange);
  // If queue and file endpoint support INOUT then below line should get printed at last.
  System.out.println("received response"); 

执行上面给出以下响应：

sending msg to queue1  

Going for sleep sleepid=1,  thread=Camel (camel-1) thread #0 - JmsConsumer[test.queue1]

Done sleep sleepid=1,  thread=Camel (camel-1) thread #0 - JmsConsumer[test.queue1]

Going for sleep sleepid=2,  thread=Camel (camel-1) thread #1 - JmsConsumer[test.queue2]

Done sleep sleepid=2,  thread=Camel (camel-1) thread #1 - JmsConsumer[test.queue2]

received response   ## this getting printed here meaning that the file endpoint do not respect the INOUT exchangepattern.

Going for sleep sleepid=3,  thread=Camel (camel-1) thread #2 - file://test    

Done sleep sleepid=3,  thread=Camel (camel-1) thread #2 - file://test

如果我们观察执行输出，我们将看到在以.开头的路由完成之前打印收到的响应FILE ENDPOINT。

这表明文件端点没有理解交换是 INOUT 交换

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图示：（点击图片放大）

Answer 1

是的。并非所有骆驼端点都支持 INOUT。JMS 端点支持它，但文件端点不支持。

不幸的是，这确实没有很好的记录。