rocket mq支持OpenMessaging访问示例

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OpenMessaging示例

RocketMQ提供OpenMessaging 0.1.0-alpha的部分实现，以下示例演示如何基于OpenMessaging访问RocketMQ。

OpenMessaging包括建立行业准则和消息传递，流媒体规范为金融，电子商务，物联网和大数据区域提供了一个共同的框架。设计原则是分布式异构环境中面向云，简单，灵活和语言无关。符合这些规范将有可能在所有主要平台和操作系统上开发异构消息应用程序。

OMSProducer

以下示例显示如何在同步，异步或单向传输中向RocketMQ代理发送消息。

public class OMSProducer {    public static void main(String[] args) {        final MessagingAccessPoint messagingAccessPoint = MessagingAccessPointFactory            .getMessagingAccessPoint("openmessaging:rocketmq://IP1:9876,IP2:9876/namespace");        final Producer producer = messagingAccessPoint.createProducer();        messagingAccessPoint.startup();        System.out.printf("MessagingAccessPoint startup OK%n");        producer.startup();        System.out.printf("Producer startup OK%n");        {            Message message = producer.createBytesMessageToTopic("OMS_HELLO_TOPIC", "OMS_HELLO_BODY".getBytes(Charset.forName("UTF-8")));            SendResult sendResult = producer.send(message);            System.out.printf("Send sync message OK, msgId: %s%n", sendResult.messageId());        }        {            final Promise<SendResult> result = producer.sendAsync(producer.createBytesMessageToTopic("OMS_HELLO_TOPIC", "OMS_HELLO_BODY".getBytes(Charset.forName("UTF-8"))));            result.addListener(new PromiseListener<SendResult>() {                @Override                public void operationCompleted(Promise<SendResult> promise) {                    System.out.printf("Send async message OK, msgId: %s%n", promise.get().messageId());                }                @Override                public void operationFailed(Promise<SendResult> promise) {                    System.out.printf("Send async message Failed, error: %s%n", promise.getThrowable().getMessage());                }            });        }        {            producer.sendOneway(producer.createBytesMessageToTopic("OMS_HELLO_TOPIC", "OMS_HELLO_BODY".getBytes(Charset.forName("UTF-8"))));            System.out.printf("Send oneway message OK%n");        }        producer.shutdown();        messagingAccessPoint.shutdown();    }}

OMSPullConsumer

使用OMS PullConsumer轮询来自指定队列的消息。

public class OMSPullConsumer {    public static void main(String[] args) {        final MessagingAccessPoint messagingAccessPoint = MessagingAccessPointFactory            .getMessagingAccessPoint("openmessaging:rocketmq://IP1:9876,IP2:9876/namespace");        final PullConsumer consumer = messagingAccessPoint.createPullConsumer("OMS_HELLO_TOPIC",            OMS.newKeyValue().put(NonStandardKeys.CONSUMER_GROUP, "OMS_CONSUMER"));        messagingAccessPoint.startup();        System.out.printf("MessagingAccessPoint startup OK%n");                consumer.startup();        System.out.printf("Consumer startup OK%n");        Message message = consumer.poll();        if (message != null) {            String msgId = message.headers().getString(MessageHeader.MESSAGE_ID);            System.out.printf("Received one message: %s%n", msgId);            consumer.ack(msgId);        }        consumer.shutdown();        messagingAccessPoint.shutdown();    }}

OMSPushConsumer

将OMS PushConsumer附加到指定的队列，并通过MessageListener消耗消息

public class OMSPushConsumer {    public static void main(String[] args) {        final MessagingAccessPoint messagingAccessPoint = MessagingAccessPointFactory            .getMessagingAccessPoint("openmessaging:rocketmq://IP1:9876,IP2:9876/namespace");        final PushConsumer consumer = messagingAccessPoint.            createPushConsumer(OMS.newKeyValue().put(NonStandardKeys.CONSUMER_GROUP, "OMS_CONSUMER"));        messagingAccessPoint.startup();        System.out.printf("MessagingAccessPoint startup OK%n");        Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {            @Override            public void run() {                consumer.shutdown();                messagingAccessPoint.shutdown();            }        }));                consumer.attachQueue("OMS_HELLO_TOPIC", new MessageListener() {            @Override            public void onMessage(final Message message, final ReceivedMessageContext context) {                System.out.printf("Received one message: %s%n", message.headers().getString(MessageHeader.MESSAGE_ID));                context.ack();            }        });            }}

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