在Anypoint MQ中,有两种方式可以接收消息:消费者和订阅者。下面是它们之间的区别以及包含代码示例的解决方法:
import org.mule.runtime.api.exception.MuleException;
import org.mule.runtime.api.message.Message;
import org.mule.runtime.api.metadata.TypedValue;
import org.mule.runtime.core.api.event.CoreEvent;
import org.mule.runtime.extension.api.annotation.param.Connection;
import org.mule.runtime.extension.api.annotation.param.MediaType;
import org.mule.runtime.extension.api.annotation.param.Parameter;
import org.mule.runtime.extension.api.annotation.param.display.DisplayName;
import org.mule.runtime.extension.api.runtime.operation.Result;
import org.mule.runtime.extension.api.runtime.streaming.PagingProvider;
import org.mule.runtime.extension.api.runtime.streaming.StreamingHelper;
import org.mule.runtime.extension.api.runtime.streaming.StreamingManager;
import org.mule.runtime.extension.api.runtime.streaming.StreamingOutput;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.TimeoutException;
public class MQConsumer {
@MediaType(value = MediaType.APPLICATION_JSON, strict = false)
public Result consumeMessages(
@Connection MQConnection connection,
@Parameter
@DisplayName("Queue Name")
String queueName,
@Parameter
@DisplayName("Timeout")
Integer timeout
) {
try {
List messages = connection.consumeMessages(queueName, timeout);
Iterator iterator = messages.iterator();
return Result.builder().output(iterator.next().getPayload().getValue()).build();
} catch (TimeoutException | MuleException e) {
return Result.builder().build();
}
}
}
import org.mule.runtime.api.exception.MuleException;
import org.mule.runtime.api.message.Message;
import org.mule.runtime.api.metadata.TypedValue;
import org.mule.runtime.core.api.event.CoreEvent;
import org.mule.runtime.extension.api.annotation.param.Connection;
import org.mule.runtime.extension.api.annotation.param.MediaType;
import org.mule.runtime.extension.api.annotation.param.Parameter;
import org.mule.runtime.extension.api.annotation.param.display.DisplayName;
import org.mule.runtime.extension.api.runtime.operation.Result;
import org.mule.runtime.extension.api.runtime.streaming.PagingProvider;
import org.mule.runtime.extension.api.runtime.streaming.StreamingHelper;
import org.mule.runtime.extension.api.runtime.streaming.StreamingManager;
import org.mule.runtime.extension.api.runtime.streaming.StreamingOutput;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.TimeoutException;
public class MQSubscriber {
@MediaType(value = MediaType.APPLICATION_JSON, strict = false)
public Result subscribeToTopic(
@Connection MQConnection connection,
@Parameter
@DisplayName("Topic Name")
String topicName,
@Parameter
@DisplayName("Timeout")
Integer timeout
) {
try {
List messages = connection.subscribeToTopic(topicName, timeout);
Iterator iterator = messages.iterator();
return Result.builder().output(iterator.next().getPayload().getValue()).build();
} catch (TimeoutException | MuleException e) {
return Result.builder().build();
}
}
}
以上代码示例中,consumMessages
方法用于消费队列中的消息,subscribeToTopic
方法用于订阅主题中的消息。在代码中,需要根据实际情况进行适当的更改,例如队列名称、主题名称和超时时间等。