4 * Copyright 2015 eddie.
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 package uk.ac.ntu.n0521366.wsyd.libs.net;
26 import java.io.ByteArrayOutputStream;
27 import java.io.IOException;
28 import java.io.InputStream;
29 import java.io.ObjectInputStream;
30 import java.io.ObjectOutputStream;
31 import java.net.Socket;
32 import java.util.List;
33 import java.util.concurrent.ConcurrentLinkedQueue;
34 import java.util.logging.Level;
35 import java.util.logging.Logger;
36 import javax.swing.SwingWorker;
42 public class NetworkStream extends SwingWorker<Boolean, NetworkMessage> {
44 private final Socket _socket;
46 static final long longSize = Long.SIZE / 8;
51 * Thread safe First In, First Out Queue of NetworkMessage objects waiting to be sent.
53 * Allows the Owner Thread to submit new messages for sending that the Worker Thread
56 protected ConcurrentLinkedQueue<NetworkMessage> _sendMessageQueue = new ConcurrentLinkedQueue<>();
58 private final NetworkMessageEventListenerManager _eventManager;
60 private ObjectOutputStream _socketOS;
62 private InputStream _socketIS;
64 private final NetworkSocketClosing _owner;
66 private ObjectInputStream _ois;
68 private ObjectOutputStream _oos;
70 private ByteArrayOutputStream _baos;
72 public NetworkStream(Socket socket, NetworkSocketClosing owner) {
73 this._socket = socket;
75 _eventManager = new NetworkMessageEventListenerManager();
79 public Boolean doInBackground() throws Exception {
81 _baos = new ByteArrayOutputStream();
82 _oos = new ObjectOutputStream(_baos);
83 _socketOS = new ObjectOutputStream(_socket.getOutputStream());
85 _socketIS = _socket.getInputStream();
86 _ois = new ObjectInputStream(_socketIS);
88 long expectedLength = longSize;
89 boolean expectingLong = true;
91 while (!this.isCancelled()) {
93 // check for incoming message
94 if (_ois.available() >= expectedLength) {
95 if (expectingLong == true) {
96 expectedLength = _ois.readLong();
97 System.err.println("Expecting Object with length " + expectedLength);
98 System.err.println("Remaining bytes: " + _ois.available());
99 expectingLong = false;
102 System.err.println("About to read at least " + _ois.available() + " bytes");
104 expectedLength = longSize;
105 expectingLong = true;
108 // send a queued message
109 NetworkMessage temp = this.sendMessage();
111 if (!this.write(temp)) {
112 System.err.println("Unable to send message over TCP channel");
113 // FIXME: Potentially add logger support
122 protected void done() {
123 _owner.canCloseSocket(_key);
127 * Send a NetworkMessage over a NetworkStream.
129 * Each message is preceeded by its length as a long to avoid rare, but possible blocking
133 * @return true if message successfully sent
135 public boolean write(NetworkMessage message) {
136 boolean result = false;
137 System.err.println("NetworkStream.write()");
139 if (message != null) {
141 _oos.writeObject(message);
143 long messageSize = _baos.size();
144 _socketOS.writeLong(messageSize);
145 System.err.println(" bytes to write: " + messageSize);
146 _baos.writeTo(_socketOS);
148 System.err.println("baos.size()=" + _baos.size());
152 } catch (IOException ex) {
153 ex.printStackTrace();
154 // TODO: Implement graceful disconnect
161 * Reads NetworkMessage from the incoming stream and publishes it.
164 * @return true if message successfully published
166 public boolean read() {
167 boolean result = false;
168 System.err.println("NetworkStream.read()");
171 NetworkMessage message = null;
174 message = (NetworkMessage)_ois.readObject();
175 } catch (java.io.OptionalDataException ex) {
176 System.err.println("Length: " + ex.length + " EOF: " + ex.eof);
177 ex.printStackTrace();
179 message.setKey(_key);
183 } catch (IOException ex) {
184 Logger.getLogger(NetworkStream.class.getName()).log(Level.SEVERE, null, ex);
185 // FIXME: Replace logger
186 // TODO: Graceful disconnect
187 } catch (ClassNotFoundException ex) {
188 Logger.getLogger(NetworkStream.class.getName()).log(Level.SEVERE, null, ex);
189 // FIXME: Replace logger
191 // TODO: Implement NetworkStream::read()
196 * Removes a message from the queue of pending messages.
198 * This method is called on the Worker Thread by the doInBackground() main loop.
200 * @return a message to be sent
202 protected NetworkMessage sendMessage() {
203 return this._sendMessageQueue.poll();
206 /* XXX: Methods below here all execute on the GUI Event Dispatch Thread */
209 * Adds a message to the queue of pending messages.
211 * This method will usually be called from the Owner Thread.
213 * @param message to be sent
214 * @return true if the message was added to the queue
216 public boolean queueMessage(NetworkMessage message) throws IllegalArgumentException {
217 boolean result = false;
219 if (message != null) {
221 try { // make a deep clone of the message
222 temp = NetworkMessage.clone(message);
223 result = this._sendMessageQueue.add(temp);
224 } catch (CloneNotSupportedException e) {
225 // TODO: queueMessage() log CloneNotSupportedException
232 public NetworkMessageEventListenerManager getEventManager() {
233 return this._eventManager;
237 * Fetch messages received over the stream.
239 * For delivery to event listeners; usually Swing GUI components. This method will run on the
240 * Owner Thread so must complete quickly as that is the GUI Event Dispatch Thread.
242 * @param list messages received and queued
245 protected void process(List<NetworkMessage> list) {
246 for (NetworkMessage message: list) {
247 this._eventManager.fireNetworkMessageEvent(message);