Initial commit

.gitignore

@@ -0,0 +1,16 @@
+*.class
+
+# Package Files #
+*.jar
+*.war
+*.ear
+
+# Intellij project files
+*.iml
+*.ipr
+*.iws
+.idea/
+
+.DS_Store
+target/
+node_modules/

.travis.yml

@@ -0,0 +1,4 @@
+language: java
+jdk:
+  - openjdk7
+  - oraclejdk7

LICENSE

@@ -0,0 +1,9 @@
+The MIT License (MIT)
+Copyright (c) 2013 Naoyuki Kanezawa
+Copyright (c) 2011 Guillermo Rauch <guillermo@learnboost.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>com.github.nkzawa</groupId>
+  <artifactId>engine.io-client</artifactId>
+  <version>0.0.1-SNAPSHOT</version>
+
+  <repositories>
+    <repository>
+      <id>sonatype-oss-public</id>
+      <url>https://oss.sonatype.org/content/groups/public/</url>
+      <releases>
+        <enabled>true</enabled>
+      </releases>
+      <snapshots>
+        <enabled>true</enabled>
+      </snapshots>
+    </repository>
+  </repositories>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.apache.httpcomponents</groupId>
+      <artifactId>httpclient</artifactId>
+      <version>4.2.3</version>
+    </dependency>
+    <dependency>
+      <groupId>com.google.code.gson</groupId>
+      <artifactId>gson</artifactId>
+      <version>2.2.2</version>
+    </dependency>
+    <dependency>
+      <groupId>org.java-websocket</groupId>
+      <artifactId>Java-WebSocket</artifactId>
+      <version>1.3.0-SNAPSHOT</version>
+    </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.11</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.0</version>
+        <configuration>
+          <source>1.6</source>
+          <target>1.6</target>
+        </configuration>
+      </plugin>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>exec-maven-plugin</artifactId>
+        <version>1.2.1</version>
+        <executions>
+          <execution>
+            <id>npm-install</id>
+            <phase>process-test-resources</phase>
+            <goals>
+              <goal>exec</goal>
+            </goals>
+            <configuration>
+              <workingDirectory>./src/test/resources</workingDirectory>
+              <executable>npm</executable>
+              <arguments>
+                  <argument>install</argument>
+              </arguments>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+</project>

src/main/java/com/github/nkzawa/emitter/Emitter.java

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+package com.github.nkzawa.emitter;
+
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.ConcurrentMap;
+
+public class Emitter {
+
+    private ConcurrentMap<String, ConcurrentLinkedQueue<Listener>> callbacks
+            = new ConcurrentHashMap<String, ConcurrentLinkedQueue<Listener>>();
+
+    private ConcurrentMap<Listener, Listener> onceCallbacks = new ConcurrentHashMap<Listener, Listener>();
+
+
+    public Emitter on(String event, Listener fn) {
+        ConcurrentLinkedQueue<Listener> callbacks = this.callbacks.get(event);
+        if (callbacks == null) {
+            callbacks = new ConcurrentLinkedQueue <Listener>();
+            ConcurrentLinkedQueue<Listener> _callbacks = this.callbacks.putIfAbsent(event, callbacks);
+            if (_callbacks != null) {
+                callbacks = _callbacks;
+            }
+        }
+        callbacks.add(fn);
+        return this;
+    }
+
+    public Emitter once(final String event, final Listener fn) {
+        Listener on = new Listener() {
+            @Override
+            public void call(Object... args) {
+                Emitter.this.off(event, this);
+                fn.call(args);
+            }
+        };
+
+        this.onceCallbacks.put(fn, on);
+        this.on(event, on);
+        return this;
+    }
+
+    public Emitter off() {
+        this.callbacks.clear();
+        this.onceCallbacks.clear();
+        return this;
+    }
+
+    public Emitter off(String event) {
+        ConcurrentLinkedQueue<Listener> callbacks = this.callbacks.remove(event);
+        if (callbacks != null) {
+            for (Listener fn : callbacks) {
+                this.onceCallbacks.remove(fn);
+            }
+        }
+        return this;
+    }
+
+    public Emitter off(String event, Listener fn) {
+        ConcurrentLinkedQueue<Listener> callbacks = this.callbacks.get(event);
+        if (callbacks != null) {
+            Listener off = this.onceCallbacks.remove(fn);
+            callbacks.remove(off != null ? off : fn);
+        }
+        return this;
+    }
+
+    public Emitter emit(String event, Object... args) {
+        ConcurrentLinkedQueue<Listener> callbacks = this.callbacks.get(event);
+        if (callbacks != null) {
+            callbacks = new ConcurrentLinkedQueue<Listener>(callbacks);
+            for (Listener fn : callbacks) {
+                fn.call(args);
+            }
+        }
+        return this;
+    }
+
+    public List<Listener> listeners(String event) {
+        ConcurrentLinkedQueue<Listener> callbacks = this.callbacks.get(event);
+        return new ArrayList<Listener>(callbacks);
+    }
+
+    public boolean hasListeners(String event) {
+        return !this.listeners(event).isEmpty();
+    }
+
+    public static interface Listener {
+        public void call(Object... args);
+    }
+}

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

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+package com.github.nkzawa.engineio.client;
+
+
+public class EngineIO {
+
+  public EngineIO() {}
+
+}

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

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+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.PollingXHR;
+import com.github.nkzawa.engineio.client.transports.WebSocket;
+import com.github.nkzawa.engineio.parser.Packet;
+import com.github.nkzawa.engineio.parser.Parser;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import org.apache.http.Consts;
+import org.apache.http.NameValuePair;
+import org.apache.http.client.utils.URLEncodedUtils;
+import org.apache.http.message.BasicNameValuePair;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.List;
+import java.util.concurrent.*;
+import java.util.logging.Logger;
+
+
+public abstract class Socket extends Emitter {
+
+    private static final Logger logger = Logger.getLogger("engine.io-client:socket");
+
+    private static final Runnable noop = new Runnable() {
+        @Override
+        public void run() {}
+    };
+
+    public static final Sockets sockets = new Sockets();
+    public static final int protocol = Parser.protocol;
+
+    private boolean secure;
+    private boolean upgrade;
+    private boolean timestampRequests;
+    private boolean upgrading;
+    private int port;
+    private int policyPort;
+    private int prevBufferLen;
+    private long pingInterval;
+    private long pingTimeout;
+    private String id;
+    private String hostname;
+    private String path;
+    private String timestampParam;
+    private String readyState = "";
+    private List<String> transports;
+    private List<String> upgrades;
+    private List<NameValuePair> query;
+    private ConcurrentLinkedQueue<Packet> writeBuffer = new ConcurrentLinkedQueue<Packet>();
+    private ConcurrentLinkedQueue<Runnable> callbackBuffer = new ConcurrentLinkedQueue<Runnable>();
+    private Transport transport;
+    private Future pingTimeoutTimer;
+    private Future pingIntervalTimer;
+
+    private ScheduledExecutorService heartbeatScheduler = Executors.newSingleThreadScheduledExecutor();
+
+
+    public Socket(String uri) throws URISyntaxException {
+        this(uri, null);
+    }
+
+    public Socket(URI uri) {
+        this(uri, null);
+    }
+
+    public Socket(String uri, Options opts) throws URISyntaxException {
+        this(new URI(uri), opts);
+    }
+
+    public Socket(URI uri, Options opts) {
+        this(Options.fromURI(uri, opts));
+    }
+
+    public Socket(Options opts) {
+        if (opts.host != null) {
+            String[] pieces = opts.host.split(":");
+            opts.hostname = pieces[0];
+            if (pieces.length > 1) {
+                opts.port = Integer.parseInt(pieces[pieces.length - 1]);
+            }
+        }
+
+        this.secure = opts.secure;
+        this.hostname = opts.hostname != null ? opts.hostname : "localhost";
+        this.port = opts.port != 0 ? opts.port : (this.secure ? 443 : 80);
+        this.query = URLEncodedUtils.parse(opts.query, Consts.UTF_8);
+        this.upgrade = opts.upgrade;
+        this.path = (opts.path != null ? opts.path : "/engine.io").replaceAll("/$", "") + "/";
+        this.timestampParam = opts.timestampParam != null ? opts.timestampParam : "t";
+        this.timestampRequests = opts.timestampRequests;
+        this.transports = new ArrayList<String>(Arrays.asList(
+                opts.transports != null ? opts.transports : new String[] {"polling", "websocket"}));
+        this.policyPort = opts.policyPort != 0 ? opts.policyPort : 843;
+
+        Socket.sockets.add(this);
+        Socket.sockets.evs.emit("add", this);
+    }
+
+    public Socket open() {
+        this.readyState = "opening";
+        Transport transport = this.createTransport(this.transports.get(0));
+        this.setTransport(transport);
+        transport.open();
+        return this;
+    }
+
+    private Transport createTransport(String name) {
+        logger.info(String.format("creating transport '%s'", name));
+        List<NameValuePair> query = new ArrayList<NameValuePair>(this.query);
+
+        query.add(new BasicNameValuePair("EIO", String.valueOf(Parser.protocol)));
+        query.add(new BasicNameValuePair("transport", name));
+        if (this.id != null) {
+            query.add(new BasicNameValuePair("sid", this.id));
+        }
+
+        Transport.Options opts = new Transport.Options();
+        opts.hostname = this.hostname;
+        opts.port = this.port;
+        opts.secure = this.secure;
+        opts.path = this.path;
+        opts.query = query;
+        opts.timestampRequests = this.timestampRequests;
+        opts.timestampParam = this.timestampParam;
+        opts.policyPort = this.policyPort;
+
+        if ("websocket".equals(name)) {
+            return new WebSocket(opts);
+        } else if ("polling".equals(name)) {
+            return new PollingXHR(opts);
+        }
+
+        throw new RuntimeException();
+    }
+
+    private void setTransport(Transport transport) {
+        final Socket self = this;
+
+        if (this.transport != null) {
+            logger.info("clearing existing transport");
+            this.transport.off();
+        }
+
+        this.transport = transport;
+
+        transport.on("drain", new Listener() {
+            @Override
+            public void call(Object... args) {
+                self.onDrain();
+            }
+        }).on("packet", new Listener() {
+            @Override
+            public void call(Object... args) {
+                self.onPacket(args.length > 0 ? (Packet) args[0] : null);
+            }
+        }).on("error", new Listener() {
+            @Override
+            public void call(Object... args) {
+                self.onError(args.length > 0 ? (Exception) args[0] : null);
+            }
+        }).on("close", new Listener() {
+            @Override
+            public void call(Object... args) {
+                self.onClose("transport close");
+            }
+        });
+    }
+
+    private void probe(final String name) {
+        logger.info(String.format("probing transport '%s'", name));
+        final Transport[] transport = new Transport[] {this.createTransport(name)};
+        final boolean[] failed = new boolean[] {false};
+        final Socket self = this;
+
+        final Listener onerror = new Listener() {
+            @Override
+            public void call(Object... args) {
+                if (failed[0]) return;
+
+                failed[0] = true;
+
+                // TODO: handle error
+                Exception err = args.length > 0 ? (Exception)args[0] : null;
+                Transport.TransportException error = new Transport.TransportException("probe error", err);
+                error.transport = transport[0].name;
+
+                transport[0].close();
+                transport[0] = null;
+                logger.info(String.format("probing transport '%s' failed because of error: %s", name, err));
+                self.emit("error", error);
+            }
+        };
+
+        transport[0].once("open", new Listener() {
+            @Override
+            public void call(Object... args) {
+                if (failed[0]) return;
+
+                logger.info(String.format("probe transport '%s' opened", name));
+                Packet packet = new Packet("ping", "probe");
+                transport[0].send(new Packet[] {packet});
+                transport[0].once("packet", new Listener() {
+                    @Override
+                    public void call(Object... args) {
+                        if (failed[0]) return;
+                        Packet msg = (Packet)args[0];
+                        if ("pong".equals(msg.type) && "probe".equals(msg.data)) {
+                            logger.info(String.format("probe transport '%s' pong", name));
+                            self.upgrading = true;
+                            self.emit("upgrading", transport[0]);
+
+                            logger.info(String.format("pausing current transport '%s'", self.transport.name));
+                            ((Polling)self.transport).pause(new Runnable() {
+                                @Override
+                                public void run() {
+                                    if (failed[0]) return;
+                                    if ("close".equals(self.readyState) ||
+                                            "closing".equals(self.readyState)) {
+                                        return;
+                                    }
+
+                                    logger.info("changing transport and sending upgrade packet");
+                                    transport[0].off("error", onerror);
+                                    self.emit("upgrade", transport);
+                                    self.setTransport(transport[0]);
+                                    Packet packet = new Packet("upgrade", null);
+                                    transport[0].send(new Packet[]{packet});
+                                    transport[0] = null;
+                                    self.upgrading = false;
+                                    self.flush();
+                                }
+                            });
+                        } else {
+                            logger.info(String.format("probe transport '%s' failed", name));
+                            Transport.TransportException err = new Transport.TransportException("probe error");
+                            err.transport = transport[0].name;
+                            self.emit("error", err);
+                        }
+                    }
+                });
+            }
+        });
+
+        transport[0].once("error", onerror);
+
+        this.once("close", new Listener() {
+            @Override
+            public void call(Object... args) {
+                if (transport[0] != null) {
+                    logger.info("socket closed prematurely - aborting probe");
+                    failed[0] = true;
+                    transport[0].close();
+                    transport[0] = null;
+                }
+            }
+        });
+
+        this.once("upgrading", new Listener() {
+            @Override
+            public void call(Object... args) {
+                Transport to = (Transport)args[0];
+                if (transport[0] != null && !to.name.equals(transport[0].name)) {
+                    logger.info(String.format("'%s' works - aborting '%s'", to.name, transport[0].name));
+                    transport[0].close();
+                    transport[0] = null;
+                }
+            }
+        });
+
+        transport[0].open();
+    }
+
+    private void onOpen() {
+        logger.info("socket open");
+        this.readyState = "open";
+        this.emit("open");
+        this.onopen();
+        this.flush();
+
+        if ("open".equals(this.readyState) && this.upgrade && this.transport instanceof Polling) {
+            logger.info("starting upgrade probes");
+            for (String upgrade: this.upgrades) {
+                this.probe(upgrade);
+            }
+        }
+    }
+
+    private void onPacket(Packet packet) {
+        if ("opening".equals(this.readyState) || "open".equals(this.readyState)) {
+            logger.info(String.format("socket received: type '%s', data '%s'", packet.type, packet.data));
+
+            this.emit("packet", packet);
+            this.emit("heartbeat");
+
+            if ("open".equals(packet.type)) {
+                this.onHandshake(new JsonParser().parse(packet.data).getAsJsonObject());
+            } else if ("pong".equals(packet.type)) {
+                this.ping();
+            } else if ("error".equals(packet.type)) {
+                // TODO: handle error
+                Exception err = new Exception("server error");
+                // err.code = packet.data;
+                this.emit("error", err);
+            } else if ("message".equals(packet.type)) {
+                this.emit("data", packet.data);
+                this.emit("message", packet.data);
+                this.onmessage(packet.data);
+            }
+        } else {
+            logger.info(String.format("packet received with socket readyState '%s'", this.readyState));
+        }
+    }
+
+    private void onHandshake(JsonObject data) {
+        this.emit("handshake", data);
+        this.id = data.get("sid").getAsString();
+
+        Iterator<NameValuePair> i = this.transport.query.iterator();
+        while (i.hasNext()) {
+            NameValuePair pair = i.next();
+            if ("sid".equals(pair.getName())) {
+                i.remove();
+            }
+        }
+        this.transport.query.add(new BasicNameValuePair("sid", data.get("sid").getAsString()));
+
+        List<String> upgrades = new ArrayList<String >();
+        for (JsonElement upgrade : data.get("upgrades").getAsJsonArray()) {
+            upgrades.add(upgrade.getAsString());
+        }
+        this.upgrades = this.filterUpgrades(upgrades);
+
+        this.pingInterval = data.get("pingInterval").getAsLong();
+        this.pingTimeout = data.get("pingTimeout").getAsLong();
+        this.onOpen();
+        this.ping();
+
+        this.off("heartbear", this.onHeartbeatAsListener);
+        this.on("heartbear", this.onHeartbeatAsListener);
+    }
+
+    private final Listener onHeartbeatAsListener = new Listener() {
+        @Override
+        public void call(Object... args) {
+            Socket.this.onHeartbeat(args.length > 0 ? (Long)args[0]: 0);
+        }
+    };
+
+    private synchronized void onHeartbeat(long timeout) {
+        if (this.pingTimeoutTimer != null) {
+            pingTimeoutTimer.cancel(true);
+        }
+
+        if (timeout <= 0) {
+            timeout = this.pingInterval + this.pingTimeout;
+        }
+
+        final Socket self = this;
+        this.pingTimeoutTimer = this.heartbeatScheduler.schedule(new Runnable() {
+            @Override
+            public void run() {
+                if ("closed".equals(self.readyState)) return;
+                self.onClose("ping timeout");
+            }
+        }, timeout, TimeUnit.MILLISECONDS);
+    }
+
+    private synchronized void ping() {
+        if (this.pingIntervalTimer != null) {
+            pingIntervalTimer.cancel(true);
+        }
+
+        final Socket self = this;
+        this.pingIntervalTimer = this.heartbeatScheduler.schedule(new Runnable() {
+            @Override
+            public void run() {
+                logger.info(String.format("writing ping packet - expecting pong within %sms", self.pingTimeout));
+                self.sendPacket("ping");
+                self.onHeartbeat(self.pingTimeout);
+            }
+        }, this.pingInterval, TimeUnit.MILLISECONDS);
+    }
+
+    private void onDrain() {
+        this.callbacks();
+        for (int i = 0; i < this.prevBufferLen; i++) {
+            this.writeBuffer.poll();
+            this.callbackBuffer.poll();
+        }
+
+        this.prevBufferLen = 0;
+        if (this.writeBuffer.size() == 0) {
+            this.emit("drain");
+        } else {
+            this.flush();
+        }
+    }
+
+    private void callbacks() {
+        Iterator<Runnable> iter = this.callbackBuffer.iterator();
+        for (int i = 0; i < this.prevBufferLen && iter.hasNext(); i++) {
+            Runnable callback = iter.next();
+            if (callback != null) {
+                callback.run();
+            }
+        }
+    }
+
+    private void flush() {
+        if (!"closed".equals(this.readyState) && this.transport.writable &&
+                !this.upgrading && this.writeBuffer.size() != 0) {
+            logger.info(String.format("flushing %d packets in socket", this.writeBuffer.size()));
+            this.prevBufferLen = this.writeBuffer.size();
+            this.transport.send(this.writeBuffer.toArray(new Packet[0]));
+            this.emit("flush");
+        }
+    }
+
+    public void write(String msg) {
+        this.write(msg, null);
+    }
+
+    public void write(String msg, Runnable fn) {
+        this.send(msg, fn);
+    }
+
+    public void send(String msg) {
+        this.send(msg, null);
+    }
+
+    public void send(String msg, Runnable fn) {
+        this.sendPacket("message", msg, fn);
+    }
+
+    private void sendPacket(String type) {
+        this.sendPacket(type, null, null);
+    }
+
+    private void sendPacket(String type, String data, Runnable fn) {
+        if (fn == null) {
+            // ConcurrentLinkedList does not permit `null`.
+            fn = noop;
+        }
+
+        Packet packet = new Packet(type, data);
+        this.emit("packetCreate", packet);
+        this.writeBuffer.offer(packet);
+        this.callbackBuffer.offer(fn);
+        this.flush();
+    }
+
+    public Socket close() {
+        if ("opening".equals(this.readyState) || "open".equals(this.readyState)) {
+            this.onClose("forced close");
+            logger.info("socket closing - telling transport to close");
+            this.transport.close();
+            this.transport.off();
+        }
+
+        return this;
+    }
+
+    private void onError(Exception err) {
+        logger.info(String.format("socket error %s", err));
+        this.emit("error", err);
+        this.onClose("transport error", err);
+    }
+
+    private void onClose(String reason) {
+        this.onClose(reason, null);
+    }
+
+    private void onClose(String reason, Exception desc) {
+        if ("opening".equals(this.readyState) || "open".equals(this.readyState)) {
+            logger.info(String.format("socket close with reason: %s", reason));
+            if (this.pingIntervalTimer != null) {
+                this.pingIntervalTimer.cancel(true);
+            }
+            if (this.pingTimeoutTimer != null) {
+                this.pingTimeoutTimer.cancel(true);
+            }
+            this.readyState = "closed";
+            this.emit("close", reason, desc);
+            this.onclose();
+            // TODO:
+            // clean buffer in next tick, so developers can still
+            // gra the buffers on `close` event
+            // setTimeout(function() {}
+            //   self.writeBuffer = [];
+            //   self.callbackBuffer = [];
+            // );
+            this.writeBuffer.clear();
+            this.callbackBuffer.clear();
+            this.id = null;
+        }
+    }
+
+    private List<String > filterUpgrades(List<String> upgrades) {
+        List<String> filteredUpgrades = new ArrayList<String>();
+        for (String upgrade : upgrades) {
+            if (this.transports.contains(upgrade)) {
+                filteredUpgrades.add(upgrade);
+            }
+        }
+        return filteredUpgrades;
+    }
+
+    public abstract void onopen();
+
+    public abstract void onmessage(String data);
+
+    public abstract void onclose();
+
+    public static class Options extends Transport.Options {
+
+        public String host;
+        public String query;
+        public String[] transports;
+        public boolean upgrade = true;
+
+
+        private static Options fromURI(URI uri, Options opts) {
+            if (opts == null) {
+                opts = new Options();
+            }
+
+            opts.host = uri.getHost();
+            opts.secure = "https".equals(uri.getScheme()) || "wss".equals(uri.getScheme());
+            opts.port = uri.getPort();
+
+            String query = uri.getQuery();
+            if (query != null) {
+                opts.query = uri.getQuery();
+            }
+
+            return opts;
+        }
+    }
+
+    public static class Sockets extends ConcurrentLinkedQueue<Socket> {
+
+        public Emitter evs = new Emitter();
+    }
+}

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

@@ -0,0 +1,123 @@
+package com.github.nkzawa.engineio.client;
+
+
+import com.github.nkzawa.emitter.Emitter;
+import com.github.nkzawa.engineio.parser.Packet;
+import com.github.nkzawa.engineio.parser.Parser;
+import org.apache.http.NameValuePair;
+
+import java.util.List;
+
+public abstract class Transport extends Emitter {
+
+    public boolean writable;
+    public String name;
+    public List<NameValuePair> query;
+
+    protected boolean secure;
+    protected boolean timestampRequests;
+    protected int port;
+    protected String path;
+    protected String hostname;
+    protected String timestampParam;
+    protected String readyState = "";
+
+    public Transport() {
+        // TODO: remove
+    }
+
+    public Transport(Options opts) {
+        this.path = opts.path;
+        this.hostname = opts.hostname;
+        this.port = opts.port;
+        this.secure = opts.secure;
+        this.query = opts.query;
+        this.timestampParam = opts.timestampParam;
+        this.timestampRequests = opts.timestampRequests;
+    }
+
+    protected Transport onError(String msg, Exception desc) {
+        // TODO:
+        Exception err = new Exception(msg);
+        // err.type = "TransportError";
+        // err.description = desc;
+        this.emit("error", err);
+        return this;
+    }
+
+    public Emitter open() {
+        if ("closed".equals(this.readyState) || "".equals(this.readyState)) {
+            this.readyState = "opening";
+            this.doOpen();
+        }
+        return this;
+    }
+
+    public Transport close() {
+        if ("opening".equals(this.readyState) || "open".equals(this.readyState)) {
+            this.doClose();
+            this.onClose();
+        }
+        return this;
+    }
+
+    public void send(Packet[] packets) {
+        if ("open".equals(this.readyState)) {
+            this.write(packets);
+        } else {
+            throw new RuntimeException("Transport not open");
+        }
+    }
+
+    protected void onOpen() {
+        this.readyState = "open";
+        this.writable = true;
+        this.emit("open");
+    }
+
+    protected void onData(String data) {
+        this.onPacket(Parser.decodePacket(data));
+    }
+
+    protected void onPacket(Packet packet) {
+        this.emit("packet", packet);
+    }
+
+    protected void onClose() {
+        this.readyState = "closed";
+        this.emit("close");
+    }
+
+    abstract protected void write(Packet[] packets);
+
+    abstract protected void doOpen();
+
+    abstract protected void doClose();
+
+
+    public static class Options {
+
+        public String hostname;
+        public String path;
+        public String timestampParam;
+        public boolean secure;
+        public boolean timestampRequests;
+        public int port;
+        public int policyPort;
+        public List<NameValuePair> query;
+
+    }
+
+    public static class TransportException extends Exception {
+
+        public String transport;
+
+        public TransportException(String detailMessage) {
+            super(detailMessage);
+        }
+
+        public TransportException(String detailMessage, Throwable throwable) {
+            super(detailMessage, throwable);
+        }
+    }
+}

src/main/java/com/github/nkzawa/engineio/client/transports/Polling.java

@@ -0,0 +1,180 @@
+package com.github.nkzawa.engineio.client.transports;
+
+
+import com.github.nkzawa.engineio.client.Transport;
+import com.github.nkzawa.engineio.parser.Packet;
+import com.github.nkzawa.engineio.parser.Parser;
+import org.apache.http.Consts;
+import org.apache.http.NameValuePair;
+import org.apache.http.client.utils.URLEncodedUtils;
+import org.apache.http.message.BasicNameValuePair;
+
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.Iterator;
+import java.util.List;
+import java.util.logging.Logger;
+
+abstract public class Polling extends Transport {
+
+    private static final Logger logger = Logger.getLogger("engine.io-client:polling");
+
+    private boolean polling;
+
+
+    public Polling(Options opts) {
+        super(opts);
+        this.name = "polling";
+    }
+
+    protected void doOpen() {
+        this.poll();
+    }
+
+    public void pause(final Runnable onPause) {
+        int pending = 0;
+        final Polling self = this;
+
+        this.readyState = "paused";
+
+        final Runnable pause = new Runnable() {
+            @Override
+            public void run() {
+                logger.info("paused");
+                self.readyState = "paused";
+                onPause.run();
+            }
+        };
+
+        if (this.polling || !this.writable) {
+            final int[] total = new int[] {0};
+
+            if (this.polling) {
+                logger.info("we are currently polling - waiting to pause");
+                total[0]++;
+                this.once("pollComplete", new Listener() {
+                    @Override
+                    public void call(Object... args) {
+                        logger.info("pre-pause polling complete");
+                        if (--total[0] == 0) {
+                            pause.run();
+                        }
+                    }
+                });
+            }
+
+            if (!this.writable) {
+                logger.info("we are currently writing - waiting to pause");
+                total[0]++;
+                this.once("drain", new Listener() {
+                    @Override
+                    public void call(Object... args) {
+                        logger.info("pre-pause writing complete");
+                        if (--total[0] == 0) {
+                            pause.run();
+                        }
+                    }
+                });
+            }
+        } else {
+            pause.run();
+        }
+    }
+
+    private void poll() {
+        logger.info("polling");
+        this.polling = true;
+        this.doPoll();
+        this.emit("poll");
+    }
+
+    protected void onData(String data) {
+        final Polling self = this;
+        logger.info(String.format("polling got data %s", data));
+
+        Parser.decodePayload(data, new Parser.DecodePayloadCallback() {
+            @Override
+            public boolean call(Packet packet, int index, int total) {
+                if ("opening".equals(self.readyState)) {
+                    self.onOpen();
+                }
+
+                if ("close".equals(packet.type)) {
+                    self.onClose();
+                    return false;
+                }
+
+                self.onPacket(packet);
+                return true;
+            }
+        });
+
+        if (!"closed".equals(this.readyState)) {
+            this.polling = false;
+            this.emit("pollComplete");
+
+            if ("open".equals(this.readyState)) {
+                this.poll();
+            } else {
+                logger.info(String.format("ignoring poll - transport state '%s'", this.readyState));
+            }
+        }
+    }
+
+    protected void doClose() {
+        logger.info("sending close packet");
+        this.send(new Packet[] {new Packet("close", null)});
+    }
+
+    protected void write(Packet[] packets) {
+        final Polling self = this;
+        this.writable = false;
+        this.doWrite(Parser.encodePayload(packets), new Runnable() {
+            @Override
+            public void run() {
+                self.writable = true;
+                self.emit("drain");
+            }
+        });
+    }
+
+    protected String uri() {
+        List<NameValuePair> query = this.query;
+        if (query == null) {
+            query = new ArrayList<NameValuePair>();
+        }
+        String schema = this.secure ? "https" : "http";
+        String port = "";
+
+        if (this.timestampRequests) {
+            Iterator<NameValuePair> i = query.iterator();
+            while (i.hasNext()) {
+                NameValuePair pair = i.next();
+                if (this.timestampParam.equals(pair.getName())) {
+                    i.remove();
+                }
+            }
+            query.add(new BasicNameValuePair(this.timestampParam,
+                    String.valueOf(new Date().getTime())));
+        }
+
+        String _query = URLEncodedUtils.format(query, Consts.UTF_8);
+
+        if (this.port > 0 && (("https".equals(schema) && this.port != 443)
+                || ("http".equals(schema) && this.port != 80))) {
+            port = ":" + this.port;
+        }
+
+        if (_query.length() > 0) {
+            _query = "?" + _query;
+        }
+
+        return new StringBuilder()
+                .append(schema).append("://").append(this.hostname)
+                .append(port).append(this.path).append(_query).toString();
+    }
+
+    abstract protected void doWrite(String data, Runnable fn);
+
+    abstract protected void doPoll();
+}

src/main/java/com/github/nkzawa/engineio/client/transports/PollingXHR.java

@@ -0,0 +1,169 @@
+package com.github.nkzawa.engineio.client.transports;
+
+
+import com.github.nkzawa.emitter.Emitter;
+
+import java.io.*;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.util.logging.Logger;
+
+public class PollingXHR extends Polling {
+
+    private static final Logger logger = Logger.getLogger("engine.io-client:polling-xhr");
+
+    private Request sendXhr;
+    private Request pollXhr;
+
+    public PollingXHR(Options opts) {
+        super(opts);
+    }
+
+    protected Request request() {
+        return this.request(null);
+    }
+
+    protected Request request(Request.Options opts) {
+        if (opts == null) {
+            opts = new Request.Options();
+        }
+        opts.uri = this.uri();
+        return new Request(opts);
+    }
+
+    protected void doWrite(String data, final Runnable fn) {
+        Request.Options opts = new Request.Options();
+        opts.method = "POST";
+        opts.data = data;
+        Request req = this.request(opts);
+        final PollingXHR self = this;
+        req.on("success", new Listener() {
+            @Override
+            public void call(Object... args) {
+                fn.run();
+            }
+        });
+        req.on("error", new Listener() {
+            @Override
+            public void call(Object... args) {
+                Exception err = args.length > 0 && args[0] instanceof Exception ? (Exception)args[0] : null;
+                self.onError("xhr post error", err);
+            }
+        });
+        req.create();
+        this.sendXhr = req;
+    }
+
+    protected void doPoll() {
+        logger.info("xhr poll");
+        Request req = this.request();
+        final PollingXHR self = this;
+        req.on("data", new Listener() {
+            @Override
+            public void call(Object... args) {
+                String data = args.length > 0 ? (String)args[0] : null;
+                self.onData(data);
+            }
+        });
+        req.on("error", new Listener() {
+            @Override
+            public void call(Object... args) {
+                Exception err = args.length > 0 && args[0] instanceof Exception ? (Exception)args[0] : null;
+                self.onError("xhr poll error", err);
+            }
+        });
+        req.create();
+        this.pollXhr = req;
+    }
+
+    private static class Request extends Emitter {
+
+        String method;
+        String uri;
+        String data;
+        HttpURLConnection xhr;
+
+        public Request(Options opts) {
+            this.method = opts.method != null ? opts.method : "GET";
+            this.uri = opts.uri;
+            this.data = opts.data;
+        }
+
+        public void create() {
+            final Request self = this;
+            try {
+                URL url = new URL(this.uri);
+                xhr = (HttpURLConnection)url.openConnection();
+                xhr.setRequestMethod(this.method);
+            } catch (IOException e) {
+                this.onError(e);
+                return;
+            }
+
+            if ("POST".equals(this.method)) {
+                xhr.setDoOutput(true);
+                xhr.setRequestProperty("Content-type", "text/plain;charset=UTF-8");
+            }
+
+            logger.info(String.format("sending xhr with url %s | data %s", this.uri, this.data));
+
+            BufferedReader reader = null;
+            try {
+                if (this.data != null) {
+                    byte[] data = this.data.getBytes("UTF-8");
+                    xhr.setFixedLengthStreamingMode(data.length);
+                    xhr.getOutputStream().write(data);
+                }
+
+                String line;
+                StringBuilder data = new StringBuilder();
+                reader = new BufferedReader(new InputStreamReader(xhr.getInputStream()));
+                while ((line = reader.readLine()) != null) {
+                    data.append(line);
+                }
+                this.onData(data.toString());
+            } catch (IOException e) {
+                e.printStackTrace();
+                this.onError(e);
+            } finally {
+                try {
+                    if (reader != null) reader.close();
+                } catch (IOException e) {}
+            }
+        }
+
+        public void onSuccess() {
+            this.emit("success");
+            this.cleanup();
+        }
+
+        public void onData(String data) {
+            this.emit("data", data);
+            this.onSuccess();
+        }
+
+        public void onError(Exception err) {
+            this.emit("error", err);
+            this.cleanup();
+        }
+
+        public void cleanup() {
+            if (xhr != null) {
+                xhr.disconnect();
+                xhr = null;
+            }
+        }
+
+        public void abort() {
+            this.cleanup();
+        }
+
+        public static class Options {
+
+            String uri;
+            String method;
+            String data;
+
+        }
+    }
+}

src/main/java/com/github/nkzawa/engineio/client/transports/WebSocket.java

@@ -0,0 +1,154 @@
+package com.github.nkzawa.engineio.client.transports;
+
+
+import com.github.nkzawa.engineio.client.Transport;
+import com.github.nkzawa.engineio.parser.Packet;
+import com.github.nkzawa.engineio.parser.Parser;
+import org.apache.http.Consts;
+import org.apache.http.NameValuePair;
+import org.apache.http.client.utils.URLEncodedUtils;
+import org.apache.http.message.BasicNameValuePair;
+import org.java_websocket.client.WebSocketClient;
+import org.java_websocket.drafts.Draft_17;
+import org.java_websocket.handshake.ServerHandshake;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.Iterator;
+import java.util.List;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+public class WebSocket extends Transport {
+
+    private WebSocketClient socket;
+    private Future bufferedAmountId;
+
+    private ScheduledExecutorService drainScheduler = Executors.newSingleThreadScheduledExecutor();
+
+
+    public WebSocket(Options opts) {
+        super(opts);
+        this.name = "websocket";
+    }
+
+    protected void doOpen() {
+        if (!this.check()) {
+            return;
+        }
+
+        final WebSocket self = this;
+        try {
+            this.socket = new WebSocketClient(new URI(this.uri()), new Draft_17()) {
+                @Override
+                public void onOpen(ServerHandshake serverHandshake) {
+                    self.onOpen();
+                }
+                @Override
+                public void onClose(int i, String s, boolean b) {
+                    self.onClose();
+                }
+                @Override
+                public void onMessage(String s) {
+                    self.onData(s);
+                }
+                @Override
+                public void onError(Exception e) {
+                    self.onError("websocket error", e);
+                }
+            };
+            this.socket.connect();
+        } catch (URISyntaxException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    protected void write(Packet[] packets) {
+        final WebSocket self = this;
+        this.writable = false;
+        for (Packet packet : packets) {
+            this.socket.send(Parser.encodePacket(packet));
+        }
+
+        final Runnable ondrain = new Runnable() {
+            @Override
+            public void run() {
+                self.writable = true;
+                self.emit("drain");
+            }
+        };
+
+        if (this.socket.getConnection().hasBufferedData()) {
+            this.bufferedAmountId = this.drainScheduler.scheduleAtFixedRate(new Runnable() {
+                @Override
+                public void run() {
+                    if (!self.socket.getConnection().hasBufferedData()) {
+                        self.bufferedAmountId.cancel(true);
+                        ondrain.run();
+                    }
+                }
+            }, 50, 50, TimeUnit.MILLISECONDS);
+        } else {
+            this.drainScheduler.schedule(ondrain, 0, TimeUnit.MILLISECONDS);
+        }
+    }
+
+    @Override
+    public void onClose() {
+        if (this.bufferedAmountId != null) {
+            this.bufferedAmountId.cancel(true);
+        }
+        super.onClose();
+    }
+
+    protected void doClose() {
+        if (this.socket != null) {
+            this.socket.close();
+        }
+    }
+
+    private String uri() {
+        List<NameValuePair> query = this.query;
+        if (query == null) {
+            query = new ArrayList<NameValuePair>();
+        }
+        String schema = this.secure ? "wss" : "ws";
+        String port = "";
+
+        if (this.port > 0 && (("wss".equals(schema) && this.port != 443)
+                || ("ws".equals(schema) && this.port != 80))) {
+            port = ":" + this.port;
+        }
+
+        if (this.timestampRequests) {
+            Iterator<NameValuePair> i = query.iterator();
+            while (i.hasNext()) {
+                NameValuePair pair = i.next();
+                if (this.timestampParam.equals(pair.getName())) {
+                    i.remove();
+                }
+            }
+            query.add(new BasicNameValuePair(this.timestampParam,
+                    String.valueOf(new Date().getTime())));
+        }
+
+        String _query = URLEncodedUtils.format(query, Consts.UTF_8);
+        if (_query.length() > 0) {
+            _query = "?" + _query;
+        }
+
+        return new StringBuilder()
+                .append(schema).append("://").append(this.hostname)
+                .append(port).append(this.path).append(_query).toString();
+    }
+
+    private boolean check() {
+        // for checking if the websocket is available. Should we remove?
+        return true;
+    }
+
+}

src/main/java/com/github/nkzawa/engineio/parser/Packet.java

@@ -0,0 +1,19 @@
+package com.github.nkzawa.engineio.parser;
+
+
+public class Packet {
+
+    public String type;
+    public String data;
+
+    public Packet(String type, String data) {
+        this.type = type;
+        this.data = data;
+    }
+
+    @Override
+    public String toString() {
+        return String.format("{\"type\": \"%s\", \"data\": \"%s\"}", this.type, this.data);
+    }
+
+}

src/main/java/com/github/nkzawa/engineio/parser/Parser.java

@@ -0,0 +1,116 @@
+package com.github.nkzawa.engineio.parser;
+
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class Parser {
+
+    public static final int protocol = 2;
+    public static final Map<String, Integer> packets = new HashMap<String, Integer>() {{
+        put("open", 0);
+        put("close", 1);
+        put("ping", 2);
+        put("pong", 3);
+        put("message", 4);
+        put("upgrade", 5);
+        put("noop", 6);
+    }};
+    public static final Map<Integer, String> bipackets = new HashMap<Integer, String>();
+    static {
+        for (Map.Entry<String, Integer> entry : packets.entrySet()) {
+            bipackets.put(entry.getValue(), entry.getKey());
+        }
+    }
+
+    private static Packet err = new Packet("error", "parser error");
+
+
+    private Parser() {}
+
+    public static String encodePacket(Packet packet) {
+        String encoded = String.valueOf(packets.get(packet.type));
+
+        if (packet.data != null) {
+            encoded += packet.data;
+        }
+        return encoded;
+    }
+
+    public static Packet decodePacket(String data) {
+        int type = Character.getNumericValue(data.charAt(0));
+        if (type < 0 || type >= packets.size()) {
+            return err;
+        }
+
+        return new Packet(bipackets.get(type), data.length() > 1 ? data.substring(1) : null);
+    }
+
+    public static String encodePayload(Packet[] packets) {
+        if (packets.length == 0) {
+            return "0:";
+        }
+
+        StringBuilder encoded = new StringBuilder();
+        for (Packet packet : packets) {
+            String message = encodePacket(packet);
+            encoded.append(message.length()).append(":").append(message);
+        }
+
+        return encoded.toString();
+    }
+
+    public static void decodePayload(String data, DecodePayloadCallback callback) {
+        if (data == null || data.isEmpty()) {
+            callback.call(err, 0, 1);
+            return;
+        }
+
+        StringBuilder length = new StringBuilder();
+        for (int i = 0, l = data.length(); i < l; i++) {
+            char chr = data.charAt(i);
+
+            if (':' != chr) {
+                length.append(chr);
+            } else {
+                int n;
+                try {
+                    n = Integer.parseInt(length.toString());
+                } catch (NumberFormatException e) {
+                    callback.call(err, 0, 1);
+                    return;
+                }
+
+                String msg;
+                try {
+                    msg = data.substring(i + 1, i + 1 + n);
+                } catch (IndexOutOfBoundsException e) {
+                    callback.call(err, 0, 1);
+                    return;
+                }
+
+                if (msg.length() != 0) {
+                    Packet packet = decodePacket(msg);
+                    if (err.type.equals(packet.type) && err.data.equals(packet.data)) {
+                        callback.call(err, 0, 1);
+                        return;
+                    }
+
+                    boolean ret = callback.call(packet, i + n, l);
+                    if (!ret) return;
+                }
+
+                i += n;
+                length = new StringBuilder();
+            }
+        }
+
+        if (length.length() > 0) {
+            callback.call(err, 0, 1);
+        }
+    }
+
+    public static interface DecodePayloadCallback {
+        public boolean call(Packet packet, int index, int total);
+    }
+}

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

@@ -0,0 +1,134 @@
+package com.github.nkzawa.engineio.client;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.URISyntaxException;
+import java.util.concurrent.*;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+@RunWith(JUnit4.class)
+public class SocketTest {
+
+    final static int PORT = 3000;
+
+    private Process serverProcess;
+    private ExecutorService serverService;
+    private Future serverOutout;
+    private Future serverError;
+    private Socket socket;
+
+    @Before
+    public void startServer() throws IOException, InterruptedException {
+        System.out.println("Starting server ...");
+
+        final CountDownLatch latch = new CountDownLatch(1);
+        serverProcess = Runtime.getRuntime().exec(
+                "node src/test/resources/index.js " + PORT, new String[] {"DEBUG=engine*"});
+        serverService = Executors.newCachedThreadPool();
+        serverOutout = serverService.submit(new Runnable() {
+            @Override
+            public void run() {
+                BufferedReader reader = new BufferedReader(
+                        new InputStreamReader(serverProcess.getInputStream()));
+                String line;
+                try {
+                    line = reader.readLine();
+                    latch.countDown();
+                    do {
+                        System.out.println("SERVER OUT: " + line);
+                    } while ((line = reader.readLine()) != null);
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+        });
+        serverError = serverService.submit(new Runnable() {
+            @Override
+            public void run() {
+                BufferedReader reader = new BufferedReader(
+                        new InputStreamReader(serverProcess.getErrorStream()));
+                String line;
+                try {
+                    while ((line = reader.readLine()) != null) {
+                        System.err.println("SERVER ERR: " + line);
+                    }
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+        });
+        latch.await(3000, TimeUnit.MILLISECONDS);
+    }
+
+    @After
+    public void stopServer() throws InterruptedException {
+        System.out.println("Stopping server ...");
+        serverProcess.destroy();
+        serverOutout.cancel(true);
+        serverError.cancel(true);
+        serverService.shutdown();
+        serverService.awaitTermination(3000, TimeUnit.MILLISECONDS);
+    }
+
+    @Test
+    public void openAndClose() throws URISyntaxException, InterruptedException {
+        final BlockingQueue<String> events = new LinkedBlockingQueue<String>();
+
+        socket = new Socket("ws://localhost:" + PORT) {
+            @Override
+            public void onopen() {
+                System.out.println("onopen:");
+                events.offer("onopen");
+            }
+
+            @Override
+            public void onmessage(String data) {}
+
+            @Override
+            public void onclose() {
+                System.out.println("onclose:");
+                events.offer("onclose");
+            }
+        }.open();
+
+        assertThat(events.take(), is("onopen"));
+        socket.close();
+        assertThat(events.take(), is("onclose"));
+    }
+
+    @Test
+    public void messages() throws URISyntaxException, InterruptedException {
+        final BlockingQueue<String> events = new LinkedBlockingQueue<String>();
+
+        socket = new Socket("ws://localhost:" + PORT) {
+            @Override
+            public void onopen() {
+                System.out.println("onopen:");
+                socket.send("hi");
+            }
+
+            @Override
+            public void onmessage(String data) {
+                System.out.println("onmessage: " + data);
+                events.offer(data);
+            }
+
+            @Override
+            public void onclose() {}
+        };
+        socket.open();
+
+        assertThat(events.take(), is("hello client"));
+        assertThat(events.take(), is("hi"));
+        socket.close();
+    }
+}

src/test/resources/index.js

@@ -0,0 +1,31 @@
+var engine = require('engine.io')
+  , port = parseInt(process.argv[2], 10) || 3000
+  , server = engine.listen(port, function() {
+      console.log('Engine.IO server listening on port', port);
+    });
+
+server.on('connection', function(socket) {
+  socket.send('hello client');
+
+  socket.on('packet', function(packet) {
+    console.log('packet:', packet);
+  });
+
+  socket.on('packetCreate', function(packet) {
+    console.log('packetCreate:', packet);
+  });
+
+  socket.on('message', function(message) {
+    console.log('message:', message);
+    socket.send(message);
+  });
+
+  socket.on('close', function(reason, desc) {
+    console.log('close:', reason, desc);
+  });
+
+  socket.on('error', function(err) {
+    console.log('error:', err);
+  });
+});
+

src/test/resources/package.json

@@ -0,0 +1,8 @@
+{
+  "name": "engine.io-client.java-test",
+  "version": "0.0.0",
+  "private": true,
+  "dependencies": {
+    "engine.io": "0.5.0"
+  }
+}