server-web: base websocket component with autoreconnect

1 files changed, 56 insertions, 0 deletions

diff --git a/juick-server-web/src/main/java/com/juick/server/component/JuickServerComponent.java b/juick-server-web/src/main/java/com/juick/server/component/JuickServerComponent.java
new file mode 100644
index 00000000..96b8c398
--- /dev/null
+++ b/juick-server-web/src/main/java/com/juick/server/component/JuickServerComponent.java
@@ -0,0 +1,56 @@
+package com.juick.server.component;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.web.socket.CloseStatus;
+import org.springframework.web.socket.PingMessage;
+import org.springframework.web.socket.TextMessage;
+import org.springframework.web.socket.WebSocketSession;
+import org.springframework.web.socket.handler.TextWebSocketHandler;
+
+import javax.inject.Inject;
+import java.io.IOException;
+
+public class JuickServerComponent extends TextWebSocketHandler {
+    private static Logger logger = LoggerFactory.getLogger(JuickServerComponent.class);
+    @Inject
+    private ApplicationEventPublisher applicationEventPublisher;
+    @Inject
+    private ObjectMapper jsonMapper;
+
+    private WebSocketSession session;
+
+    @Override
+    public void afterConnectionEstablished(WebSocketSession session) throws Exception {
+        logger.info("WebSocket connected");
+        this.session = session;
+    }
+
+    @Override
+    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
+        logger.info("WebSocket disconnected with code {}: {}", status.getCode(), status.getReason());
+        applicationEventPublisher.publishEvent(new DisconnectedEvent(this));
+    }
+
+    @Override
+    protected void handleTextMessage(WebSocketSession session, TextMessage text) throws Exception {
+        com.juick.Message jmsg = jsonMapper.readValue(text.asBytes(), com.juick.Message.class);
+
+        if (logger.isInfoEnabled()) // prevent writeValueAsString execution if logger disabled
+            logger.info("got jmsg: {}", jsonMapper.writeValueAsString(jmsg));
+        applicationEventPublisher.publishEvent(new MessageEvent(this, jmsg));
+    }
+
+    @Scheduled(fixedRate = 30000, initialDelay = 30000)
+    public void ping() throws IOException {
+        if (session != null && session.isOpen()) {
+            logger.debug("Sending WebSocket ping");
+            session.sendMessage(new PingMessage());
+        } else {
+            applicationEventPublisher.publishEvent(new DisconnectedEvent(this));
+        }
+    }
+}