[英]How to subscribe to a Durable TOPIC using Apache camel / Spring-boot?
[英]Apache Camel — Hazelcast Topic Publish/Subscribe — how to serialize String message in Subscriber
我试图按照http://camel.apache.org/hazelcast-component.html#HazelcastComponent-topic上的示例代码通过Hazelcast进行发布/订阅测试。
下面列出了发布者和订阅者路线定义
<route>
<from uri="direct:inbound" />
<setHeader headerName="CamelHazelcastOperationType">
<simple>${type:org.apache.camel.component.hazelcast.HazelcastConstants.PUBLISH_OPERATION}</simple>
</setHeader>
<to uri="hazelcast:topic:foo" />
</route>
<route>
<from uri="hazelcast:topic:foo" />
<log message="from hazelcast topic:= ${body}" />
<bean ref="inboundProcessor" method="processHazelcastMsg" />
</route>
在测试期间,我通过direct:inbound端点向发布者路由发送了一个字符串,例如“ {\\“ result \\”:\\“ InboundProcessor.processRequest success \\”}“。 订户路由能够从主题接收消息并传递给处理器Bean。 但是,我无法正确取回字符串...
这是我实现bean方法的方法
public void processHazelcastMsg(Exchange inEx) throws Exception{
Map<String, Object> headers = inEx.getIn().getHeaders();
System.out.println("Exchange > In msg > Body = " + inEx.getIn().getBody());
System.out.println("Exchange > In msg > Body class = " + ObjectHelper.className(inEx.getIn().getBody()));
DataAwareMessage msg = inEx.getIn().getBody(DataAwareMessage.class);
byte[] b = serializeObject(msg.getMessageObject());
String msgStr = new String(b, Charset.forName("utf-8"));
System.out.println("Received msg string = " + msgStr);
}
private static byte[] serializeObject(Object object) throws IOException
{
try (ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutput out = new ObjectOutputStream(bos)) {
out.writeObject(object);
return bos.toByteArray();
}
}
这是日志输出:
[ hz._hzInstance_1_dev.event-5] route4 INFO from hazelcast topic:= com.hazelcast.topic.impl.DataAwareMessage[source=foo]
Exchange > In msg > Body = com.hazelcast.topic.impl.DataAwareMessage[source=foo]
Exchange > In msg > Body class = com.hazelcast.topic.impl.DataAwareMessage
Received msg string = ��
我确实尝试使用不同的编码(例如UTF-8 / UTF-16 ...等)来隐蔽字符串,但仍然失败。 想知道是否应该有另一种方法来恢复订户中正确的字符串
使用hazelcast主题生产者,消息正文为Message类型。 您可以通过调用Message.getMessageObject()
获得原始对象:
public void processHazelcastMsg(Exchange inEx) throws Exception {
String msgStr = inEx.getIn().getBody(Message.class).getMessageObject().toString();
}
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