compatible with 0.6.1

src/main/java/com/github/nkzawa/engineio/client/Socket.java

@@ -378,7 +378,7 @@ public abstract class Socket extends Emitter {
             if (Packet.OPEN.equals(packet.type)) {
                 this.onHandshake(gson.fromJson(packet.data, HandshakeData.class));
             } else if (Packet.PONG.equals(packet.type)) {
-                this.ping();
+                this.setPing();
             } else if (Packet.ERROR.equals(packet.type)) {
                 // TODO: handle error
                 EngineIOException err = new EngineIOException("server error");
@@ -402,7 +402,7 @@ public abstract class Socket extends Emitter {
         this.pingInterval = data.pingInterval;
         this.pingTimeout = data.pingTimeout;
         this.onOpen();
-        this.ping();
+        this.setPing();
 
         this.off(EVENT_HEARTBEAT, this.onHeartbeatAsListener);
         this.on(EVENT_HEARTBEAT, this.onHeartbeatAsListener);
@@ -439,7 +439,7 @@ public abstract class Socket extends Emitter {
         }, timeout, TimeUnit.MILLISECONDS);
     }
 
-    private void ping() {
+    private void setPing() {
         if (this.pingIntervalTimer != null) {
             pingIntervalTimer.cancel(true);
         }
@@ -452,7 +452,7 @@ public abstract class Socket extends Emitter {
                     @Override
                     public void run() {
                         logger.fine(String.format("writing ping packet - expecting pong within %sms", self.pingTimeout));
-                        self.sendPacket(Packet.PING);
+                        self.ping();
                         self.onHeartbeat(self.pingTimeout);
                     }
                 });
@@ -460,6 +460,18 @@ public abstract class Socket extends Emitter {
         }, this.pingInterval, TimeUnit.MILLISECONDS);
     }
 
+    /**
+     * Sends a ping packet
+     */
+    public void ping() {
+        EventThread.exec(new Runnable() {
+            @Override
+            public void run() {
+                Socket.this.sendPacket(Packet.PING);
+            }
+        });
+    }
+
     private void onDrain() {
         this.callbacks();
         for (int i = 0; i < this.prevBufferLen; i++) {
@@ -578,6 +590,7 @@ public abstract class Socket extends Emitter {
     private void onClose(String reason, Exception desc) {
         if (this.readyState == ReadyState.OPENING || this.readyState == ReadyState.OPEN) {
             logger.fine(String.format("socket close with reason: %s", reason));
+            final Socket self = this;
             if (this.pingIntervalTimer != null) {
                 this.pingIntervalTimer.cancel(true);
             }
@@ -587,12 +600,15 @@ public abstract class Socket extends Emitter {
             EventThread.nextTick(new Runnable() {
                 @Override
                 public void run() {
-                    Socket.this.writeBuffer.clear();
-                    Socket.this.callbackBuffer.clear();
+                    self.writeBuffer.clear();
+                    self.callbackBuffer.clear();
                 }
             });
+            ReadyState prev = this.readyState;
             this.readyState = ReadyState.CLOSED;
-            this.emit(EVENT_CLOSE, reason, desc);
+            if (prev == ReadyState.OPEN) {
+                this.emit(EVENT_CLOSE, reason, desc);
+            }
             this.onclose();
             this.id = null;
         }

src/test/java/com/github/nkzawa/engineio/client/SocketTest.java

@@ -1,11 +1,13 @@
 package com.github.nkzawa.engineio.client;
 
+import com.github.nkzawa.emitter.Emitter;
 import com.github.nkzawa.engineio.client.transports.Polling;
 import com.github.nkzawa.engineio.client.transports.WebSocket;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
 
+import java.net.URISyntaxException;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -35,4 +37,32 @@ public class SocketTest {
         assertThat(socket.filterUpgrades(upgrades), is(expected));
     }
 
+    /**
+     * should not emit close on incorrect connection.
+     *
+     * @throws URISyntaxException
+     */
+    @Test
+    public void socketClosing() throws URISyntaxException, InterruptedException {
+        Socket socket = new Socket("ws://localhost:8080") {
+            @Override
+            public void onopen() {}
+            @Override
+            public void onmessage(String data) {}
+            @Override
+            public void onclose() {}
+        };
+        final boolean[] closed = {false};
+
+        socket.on(Socket.EVENT_CLOSE, new Emitter.Listener() {
+            @Override
+            public void call(Object... args) {
+                closed[0] = true;
+            }
+        });
+        socket.open();
+
+        Thread.sleep(200);
+        assertThat(closed[0], is(false));
+    }
 }

src/test/resources/package.json

@@ -3,6 +3,6 @@
   "version": "0.0.0",
   "private": true,
   "dependencies": {
-    "engine.io": "0.5.0"
+    "engine.io": "0.6.1"
   }
 }