我正在使用spring boot和websocket构建通知系统，我使用ActiveMQ为队列用户保留队列，它工作正常。
我需要编辑一些配置，比如队列时间才能生效，将消息保留在队列中直到用户阅读它，我不知道如何配置它？
以下是其实施：
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {
@Override
public void configureMessageBroker(MessageBrokerRegistry config) {
/*config.enableSimpleBroker("/topic");
config.setApplicationDestinationPrefixes("/app");*/
config
.setApplicationDestinationPrefixes("/app")
.setUserDestinationPrefix("/user")
.enableStompBrokerRelay("/topic","/queue","/user")
.setRelayHost("localhost")
.setRelayPort(61613)
.setClientLogin("guest")
.setClientPasscode("guest");
}
public void registerStompEndpoints(StompEndpointRegistry registry) {
registry.addEndpoint("/websocket").withSockJS();
}
}
和：
@Service
public class NotificationWebSocketService {
@Autowired
private SimpMessagingTemplate messagingTemplate;
public void initiateNotification(WebSocketNotification notificationData) throws InterruptedException {
messagingTemplate.convertAndSendToUser(notificationData.getUserID(), "/reply", notificationData.getMessage());
}
}
在调用NotificationWebSocketService之后，它将在activemq中创建队列“/ user / Johon / reply”，当收到此队列消息中的用户订阅时，该消息包含消息。
如何配置队列生存时间，将消息保留在队列中直到用户读取它为止？
单元测试说明如何在用户队列中设置消息的到期时间。必需的tomcat嵌入式，spring-messaging和active-mq
import org.apache.catalina.Context;
import org.apache.catalina.Wrapper;
import org.apache.catalina.connector.Connector;
import org.apache.catalina.startup.Tomcat;
import org.apache.coyote.http11.Http11NioProtocol;
import org.apache.tomcat.util.descriptor.web.ApplicationListener;
import org.apache.tomcat.websocket.server.WsContextListener;
import org.junit.AfterClass;
import org.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.simp.SimpMessagingTemplate;
import org.springframework.messaging.simp.config.ChannelRegistration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.messaging.simp.stomp.*;
import org.springframework.messaging.support.ChannelInterceptorAdapter;
import org.springframework.web.SpringServletContainerInitializer;
import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
import org.springframework.web.socket.WebSocketHttpHeaders;
import org.springframework.web.socket.client.standard.StandardWebSocketClient;
import org.springframework.web.socket.config.annotation.AbstractWebSocketMessageBrokerConfigurer;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.messaging.WebSocketStompClient;
import org.springframework.web.socket.sockjs.client.SockJsClient;
import org.springframework.web.socket.sockjs.client.WebSocketTransport;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.Type;
import java.util.*;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import static java.util.concurrent.TimeUnit.SECONDS;
public class Test48402361 {
private static final Logger logger = LoggerFactory.getLogger(Test48402361.class);
private static TomcatWebSocketTestServer server = new TomcatWebSocketTestServer(33333);
@BeforeClass
public static void beforeClass() throws Exception {
server.deployConfig(Config.class);
server.start();
}
@AfterClass
public static void afterClass() throws Exception {
server.stop();
}
@Test
public void testUser() throws Exception {
WebSocketStompClient stompClient = new WebSocketStompClient(new SockJsClient(Collections.singletonList(new WebSocketTransport(new StandardWebSocketClient()))));
BlockingQueue<String> blockingQueue = new LinkedBlockingQueue<>();
StompSession session = stompClient
.connect("ws://localhost:" + server.getPort() + "/test", new WebSocketHttpHeaders(), new StompSessionHandlerAdapter() {
})
.get();
// waiting until message 2 expired
Thread.sleep(3000);
session.subscribe("/user/john/reply", new StompFrameHandler() {
@Override
public Type getPayloadType(StompHeaders headers) {
return byte[].class;
}
@Override
public void handleFrame(StompHeaders headers, Object payload) {
String message = new String((byte[]) payload);
logger.debug("message: {}, headers: {}", message, headers);
blockingQueue.add(message);
}
});
String message = blockingQueue.poll(1, SECONDS);
Assert.assertEquals("1", message);
message = blockingQueue.poll(1, SECONDS);
Assert.assertEquals("3", message);
}
public static class Config extends AbstractAnnotationConfigDispatcherServletInitializer {
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class[] { };
}
@Override
protected Class<?>[] getServletConfigClasses() {
return new Class[] { Mvc.class };
}
@Override
protected String[] getServletMappings() {
return new String[] { "/" };
}
}
@Configuration
@EnableWebSocketMessageBroker
public static class Mvc extends AbstractWebSocketMessageBrokerConfigurer {
@Override
public void registerStompEndpoints(StompEndpointRegistry stompEndpointRegistry) {
stompEndpointRegistry.addEndpoint("/test")
.withSockJS()
.setWebSocketEnabled(true);
}
@Override
public void configureMessageBroker(MessageBrokerRegistry registry) {
registry.enableStompBrokerRelay("/user").setRelayHost("localhost").setRelayPort(61614);
}
@Autowired
private SimpMessagingTemplate template;
@Override
public void configureClientInboundChannel(ChannelRegistration registration) {
registration.setInterceptors(new ChannelInterceptorAdapter() {
@Override
public Message<?> preSend(Message<?> message, MessageChannel channel) {
StompHeaderAccessor sha = StompHeaderAccessor.wrap(message);
switch (sha.getCommand()) {
case CONNECT:
// after connect we send 3 messages to user john, one will purged after 2 seconds.
template.convertAndSendToUser("john", "/reply", "1");
Map<String, Object> headers = new HashMap<>();
headers.put("expires", System.currentTimeMillis() + 2000);
template.convertAndSendToUser("john", "/reply", "2", headers);
template.convertAndSendToUser("john", "/reply", "3");
break;
}
return super.preSend(message, channel);
}
});
}
}
public static class TomcatWebSocketTestServer {
private static final ApplicationListener WS_APPLICATION_LISTENER =
new ApplicationListener(WsContextListener.class.getName(), false);
private final Tomcat tomcatServer;
private final int port;
private Context context;
public TomcatWebSocketTestServer(int port) {
this.port = port;
Connector connector = new Connector(Http11NioProtocol.class.getName());
connector.setPort(this.port);
File baseDir = createTempDir("tomcat");
String baseDirPath = baseDir.getAbsolutePath();
this.tomcatServer = new Tomcat();
this.tomcatServer.setBaseDir(baseDirPath);
this.tomcatServer.setPort(this.port);
this.tomcatServer.getService().addConnector(connector);
this.tomcatServer.setConnector(connector);
}
private File createTempDir(String prefix) {
try {
File tempFolder = File.createTempFile(prefix + '.', "." + getPort());
tempFolder.delete();
tempFolder.mkdir();
tempFolder.deleteOnExit();
return tempFolder;
} catch (IOException ex) {
throw new RuntimeException("Unable to create temp directory", ex);
}
}
public int getPort() {
return this.port;
}
@SafeVarargs
public final void deployConfig(Class<? extends WebApplicationInitializer>... initializers) {
this.context = this.tomcatServer.addContext("", System.getProperty("java.io.tmpdir"));
// Add Tomcat's DefaultServlet
Wrapper defaultServlet = this.context.createWrapper();
defaultServlet.setName("default");
defaultServlet.setServletClass("org.apache.catalina.servlets.DefaultServlet");
this.context.addChild(defaultServlet);
// Ensure WebSocket support
this.context.addApplicationListener(WS_APPLICATION_LISTENER);
this.context.addServletContainerInitializer(
new SpringServletContainerInitializer(), new HashSet<>(Arrays.asList(initializers)));
}
public void start() throws Exception {
this.tomcatServer.start();
}
public void stop() throws Exception {
this.tomcatServer.stop();
}
}
}
“stompClient.subscribe（'/ user / Johon / reply' - >'/ user / Johon / reply'是一个主题，而不是一个队列。
如果您的Stomp客户端未连接到主题'/ user / Johon / reply'，他将丢失发送到该主题的每条消息。
所以你的解决方案是：
追溯消费者只是一个常规的JMS主题消费者，它表示在订阅开始时，应该使用每次尝试来回溯并发送消费者可能错过的任何旧消息（或该主题上发送的最后消息） 。 http://activemq.apache.org/retroactive-consumer.html
订阅恢复策略允许您在订阅主题时返回。 http://activemq.apache.org/subscription-recovery-policy.html
在系统中通常不需要长时间离线的持久主题订户。原因是经纪人需要保留发送给所述订户的那些主题的所有消息。并且这个消息打桩可以随着时间的推移经纪人存储限制，例如导致系统的整体减速。 http://activemq.apache.org/manage-durable-subscribers.html
Stomp的耐用订阅者：http://activemq.apache.org/stomp.html#Stomp-ActiveMQExtensionstoSTOMP
CONNECT client-id string指定与activemq.subcriptionName结合使用的JMS clientID，以表示持久订阅者。
关于TTL的一些解释
客户端可以为其发送的每条消息指定生存时间值（以毫秒为单位）。此值定义消息到期时间，即消息的生存时间和GMT发送时的总和（对于事务发送，这是客户端发送消息的时间，而不是事务提交的时间）。
默认生存时间为0，因此消息将无限期地保留在队列中，或者直到服务器对消息进行最终处理
UPDATE
如果你想使用外部ActiveMQ Broker
删除@EnableWebSocketMessageBroker并添加到连接器下面的activemq.xml并重新启动代理。
<transportConnector name="stomp" uri="stomp://localhost:61613"/>
如果要嵌入ActiveMQ Broker，请将bean添加到WebSocketConfig：
@Bean(initMethod = "start", destroyMethod = "stop")
public BrokerService broker() throws Exception {
final BrokerService broker = new BrokerService();
broker.addConnector("stomp://localhost:61613");
return broker;
}
和所需的依赖项
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-activemq</artifactId> </dependency> <dependency> <groupId>org.apache.activemq</groupId> <artifactId>activemq-stomp</artifactId> </dependency>
完整的例子Spring Boot WebSocket with embedded ActiveMQ Broker
http://www.devglan.com/spring-boot/spring-boot-websocket-integration-example