1/*
2 * Copyright (c) 2011 Oracle and/or its affiliates. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 *   - Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 *
11 *   - Redistributions in binary form must reproduce the above copyright
12 *     notice, this list of conditions and the following disclaimer in the
13 *     documentation and/or other materials provided with the distribution.
14 *
15 *   - Neither the name of Oracle nor the names of its
16 *     contributors may be used to endorse or promote products derived
17 *     from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
20 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*
33 * This source code is provided to illustrate the usage of a given feature
34 * or technique and has been deliberately simplified. Additional steps
35 * required for a production-quality application, such as security checks,
36 * input validation and proper error handling, might not be present in
37 * this sample code.
38 */
39
40
41import java.nio.ByteBuffer;
42
43/**
44 * Writes all messages in our buffer to the other clients
45 * and appends new data read from the socket to our buffer
46 */
47class MessageReader implements DataReader {
48    private final ChatServer chatServer;
49
50    public MessageReader(ChatServer chatServer) {
51        this.chatServer = chatServer;
52    }
53
54    public boolean acceptsMessages() {
55        return true;
56    }
57
58    /**
59     * Write all full messages in our buffer to
60     * the other clients
61     *
62     * @param client the client to read messages from
63     */
64    @Override
65    public void beforeRead(Client client) {
66        // Check if we have any messages buffered and send them
67        String message = client.nextMessage();
68        while (message != null) {
69            chatServer.writeMessageToClients(client, message);
70            message = client.nextMessage();
71        }
72    }
73
74    /**
75     * Append the read buffer to the clients message buffer
76     * @param client the client to append messages to
77     * @param buffer the buffer we received from the socket
78     * @param bytes the number of bytes read into the buffer
79     */
80    @Override
81    public void onData(Client client, ByteBuffer buffer, int bytes) {
82        buffer.flip();
83        // Just append the message on the buffer
84        client.appendMessage(new String(buffer.array(), 0, bytes));
85    }
86}
87