From ee20020d9c576a48173c13b68b03d349c0ec3e47 Mon Sep 17 00:00:00 2001
From: Vitaly Takmazov
Date: Thu, 2 Nov 2017 16:02:17 +0300
Subject: server-web: base websocket component with autoreconnect

---
 .../server/component/JuickServerComponent.java     | 56 ++++++++++++++++++++++
 .../component/JuickServerReconnectManager.java     | 22 +++++++++
 .../com/juick/server/component/MessageEvent.java   | 21 ++++++++
 .../JuickServerComponentConfiguration.java         | 30 ++++++++++++
 4 files changed, 129 insertions(+)
 create mode 100644 juick-server-web/src/main/java/com/juick/server/component/JuickServerComponent.java
 create mode 100644 juick-server-web/src/main/java/com/juick/server/component/JuickServerReconnectManager.java
 create mode 100644 juick-server-web/src/main/java/com/juick/server/component/MessageEvent.java
 create mode 100644 juick-server-web/src/main/java/com/juick/server/configuration/JuickServerComponentConfiguration.java

(limited to 'juick-server-web/src/main/java/com')

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));
+        }
+    }
+}
diff --git a/juick-server-web/src/main/java/com/juick/server/component/JuickServerReconnectManager.java b/juick-server-web/src/main/java/com/juick/server/component/JuickServerReconnectManager.java
new file mode 100644
index 00000000..a662e4fb
--- /dev/null
+++ b/juick-server-web/src/main/java/com/juick/server/component/JuickServerReconnectManager.java
@@ -0,0 +1,22 @@
+package com.juick.server.component;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.context.ApplicationListener;
+import org.springframework.stereotype.Component;
+import org.springframework.web.socket.client.WebSocketConnectionManager;
+
+import javax.inject.Inject;
+
+@Component
+public class JuickServerReconnectManager implements ApplicationListener<DisconnectedEvent> {
+    private static Logger logger = LoggerFactory.getLogger(JuickServerReconnectManager.class);
+    @Inject
+    private WebSocketConnectionManager webSocketConnectionManager;
+    @Override
+    public void onApplicationEvent(DisconnectedEvent event) {
+        logger.info("retrying...");
+        webSocketConnectionManager.stop();
+        webSocketConnectionManager.start();
+    }
+}
diff --git a/juick-server-web/src/main/java/com/juick/server/component/MessageEvent.java b/juick-server-web/src/main/java/com/juick/server/component/MessageEvent.java
new file mode 100644
index 00000000..59537a79
--- /dev/null
+++ b/juick-server-web/src/main/java/com/juick/server/component/MessageEvent.java
@@ -0,0 +1,21 @@
+package com.juick.server.component;
+
+import com.juick.Message;
+import org.springframework.context.ApplicationEvent;
+
+public class MessageEvent extends ApplicationEvent {
+    private Message message;
+    /**
+     * Create a new ApplicationEvent.
+     *
+     * @param source the object on which the event initially occurred (never {@code null})
+     */
+    public MessageEvent(Object source, Message message) {
+        super(source);
+        this.message = message;
+    }
+
+    public Message getMessage() {
+        return message;
+    }
+}
diff --git a/juick-server-web/src/main/java/com/juick/server/configuration/JuickServerComponentConfiguration.java b/juick-server-web/src/main/java/com/juick/server/configuration/JuickServerComponentConfiguration.java
new file mode 100644
index 00000000..7ddda36e
--- /dev/null
+++ b/juick-server-web/src/main/java/com/juick/server/configuration/JuickServerComponentConfiguration.java
@@ -0,0 +1,30 @@
+package com.juick.server.configuration;
+
+import com.juick.server.component.JuickServerComponent;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.scheduling.annotation.EnableScheduling;
+import org.springframework.web.socket.client.WebSocketConnectionManager;
+import org.springframework.web.socket.client.standard.StandardWebSocketClient;
+
+import javax.inject.Inject;
+
+@Configuration
+@EnableScheduling
+public class JuickServerComponentConfiguration {
+    @Value("${websocket_url:ws://localhost:8080/ws/}")
+    private String WS_URI;
+    @Inject
+    private JuickServerComponent juickServerComponent;
+    @Bean
+    public WebSocketConnectionManager connectionManager() {
+        WebSocketConnectionManager manager = new WebSocketConnectionManager(client(), juickServerComponent, WS_URI);
+        manager.setAutoStartup(true);
+        return manager;
+    }
+    @Bean
+    public StandardWebSocketClient client() {
+        return new StandardWebSocketClient();
+    }
+}
-- 
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