我花了将近两天的时间来理解并发消费者与apache camel中的线程的概念。但我真的不明白这个概念。任何人都可以帮我理解这个概念。我正在使用骆驼2.12.0。
from("jms:queue:start?concureentConsumers=5")
.threads(3, 3, "replyThread")
.bean(new SomeBean());
pom.xml
==========================================
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<camel.version>2.12.0</camel.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.1</version>
<scope>test</scope>
</dependency>
<!-- required by both client and server -->
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-core</artifactId>
<version>${camel.version}</version>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-spring</artifactId>
<version>${camel.version}</version>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-jms</artifactId>
<version>${camel.version}</version>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-test</artifactId>
<version>${camel.version}</version>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-activemq</artifactId>
<version>1.1.0</version>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-test-spring</artifactId>
<version>2.12.1</version>
</dependency>
</dependencies>
//posting to queue
for (int i = 0; i < 10; i++) {
System.out.println(Thread.currentThread() + " sending request..." + i);
template.asyncCallbackRequestBody("jms:queue:start", (body + " " + i), callback);
}
//my call back
public class MyCallback extends SynchronizationAdapter {
@Override
public void onComplete(Exchange exchange) {
String body = exchange.getOut().getBody(String.class);
System.out.println(Thread.currentThread() + " Callback Resposne..." +body);
}
}
public static class SomeBean {
public void someMethod(Exchange body) {
System.out.println(Thread.currentThread() + " Received: " + body.getIn().getBody());
body.getOut().setBody(body.getIn().getBody());
}
}
我的理解(来自apache camel文档)是jms上有5个竞争消费者:开始排队消费消息。和3“replyThreads”来处理来自jms的异步回复:启动队列。但实际输出是不同的。
Thread[main,5,main] sending request...0
Thread[main,5,main] sending request...1
Thread[Camel (camel-1) thread #9 - replyThread,5,main] Received: Hello Camel 0
Thread[Camel (camel-1) thread #10 - replyThread,5,main] Received: Hello Camel 1
Thread[Camel (camel-1) thread #5 - ProducerTemplate,5,main] Callback Resposne...Hello Camel 0
Thread[Camel (camel-1) thread #6 - ProducerTemplate,5,main] Callback Resposne...Hello Camel 1
答案 0 :(得分:3)
JMS组件具有内置线程池,可根据消息排队的数量向上和向下扩展。
所以只需使用
from("jms:queue:start?concurrentConsumers=5")
.bean(new SomeBean());
您也可以指定最大值,以便有一个范围
from("jms:queue:start?concurrentConsumers=5&maxConcurrentConsumers=10")
.bean(new SomeBean());
答案 1 :(得分:0)
如果要检查JMS线程池,则需要更改此路由
from("jms:queue:start?concurrentConsumers=5")
.bean(new SomeBean())
.threads(3, 3, "replyThread")
.bean(new SomeBean());
SomeBean可以向您显示在驼峰路由中使用不同的线程池。