99 lines
2.7 KiB
Markdown
99 lines
2.7 KiB
Markdown
# 消息队列
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   MessageAgent是消息中心抽象接口。
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## 配置
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```xml
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<mq name="mymq" type="kafka">
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<servers value="127.0.0.1:9092"/>
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<consumer autoload="true"/>
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</mq>
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```
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## 消费消息
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   通过```@ResourceConsumer```和```MessageConsumer```接口实现消费
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```java
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@ResourceConsumer(mq = "mymq", topics = "test_bean_topic")
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public class TestMessageConsumer implements MessageConsumer<TestBean> {
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@Override
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public void init(AnyValue config) {
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System.out.println("执行 TestMessageConsumer.init");
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}
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@Override
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public void onMessage(MessageConext context, TestBean message) {
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System.out.println("消费消息, message: " + message);
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}
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@Override
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public void destroy(AnyValue config) {
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System.out.println("执行 TestMessageConsumer.destroy");
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}
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}
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```
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  通过Service里标记```@Messaged```的方法实现消费, 方法只能是```protected```或```public```， 不能是```final```、```static```。
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```java
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public class TestMessageService extends AbstractService {
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@Messaged(mq = "mymq", topics = "test_bean_topic")
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protected void runMessage(TestBean message) {
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System.out.println("消费消息, message: " + message);
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}
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}
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```
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  通过```@Component```的Service里标记```@Messaged```的方法实现消费, 方法只能是```public```。
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```java
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@Component
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public final class TestMessageService extends AbstractService {
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@Messaged(mq = "mymq", topics = "test_bean_topic")
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public int runMessage(TestBean message) {
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System.out.println("消费消息, message: " + message);
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return 0;
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}
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}
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```
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## 生产消息
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  通过```@Component```的Service里标记```@Messaged```的方法实现消费, 方法只能是```public```。
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```java
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@Component
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public class TestMessageService extends AbstractService {
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@ResourceProducer(mq = "mymq")
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private MessageProducer producer;
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public void sendMessage() {
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TestBean bean = new TestBean(12345, "this is a message");
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System.out.println("生产消息: " + bean);
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producer.sendMessage("test_bean_topic", bean);
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}
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}
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```
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## Topic管理
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  通过```MessageManager```操作topic。
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```java
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public class TestMessageManager extends AbstractService {
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@Resource(name = "mymq")
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private MessageManager manager;
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// 创建topic
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public void initTopic() {
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manager.createTopic("topic_1", "topic_2").join();
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}
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// 删除topic
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public void deleteTopic() {
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manager.deleteTopic("topic_1", "topic_2").join();
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}
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// 查询topic
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public void printTopic() {
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List<String> topics = manager.queryTopic().join();
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}
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}
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```
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