1/*
2 * Copyright (c) 2004, 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.io.*;
42import java.nio.*;
43
44/**
45 * Primary driver class used by blocking Servers to receive,
46 * prepare, send, and shutdown requests.
47 *
48 * @author Mark Reinhold
49 * @author Brad R. Wetmore
50 */
51class RequestServicer implements Runnable {
52
53    private ChannelIO cio;
54
55    private static int created = 0;
56
57    RequestServicer(ChannelIO cio) {
58        this.cio = cio;
59
60        // Simple heartbeat to let user know we're alive.
61        synchronized (RequestServicer.class) {
62            created++;
63            if ((created % 50) == 0) {
64                System.out.println(".");
65                created = 0;
66            } else {
67                System.out.print(".");
68            }
69        }
70    }
71
72    private void service() throws IOException {
73        Reply rp = null;
74        try {
75            ByteBuffer rbb = receive();         // Receive
76            Request rq = null;
77            try {                               // Parse
78                rq = Request.parse(rbb);
79            } catch (MalformedRequestException x) {
80                rp = new Reply(Reply.Code.BAD_REQUEST,
81                               new StringContent(x));
82            }
83            if (rp == null) rp = build(rq);     // Build
84            do {} while (rp.send(cio));         // Send
85            do {} while (!cio.shutdown());
86            cio.close();
87            rp.release();
88        } catch (IOException x) {
89            String m = x.getMessage();
90            if (!m.equals("Broken pipe") &&
91                    !m.equals("Connection reset by peer")) {
92                System.err.println("RequestHandler: " + x.toString());
93            }
94
95            try {
96                /*
97                 * We had a failure here, so we'll try to be nice
98                 * before closing down and send off a close_notify,
99                 * but if we can't get the message off with one try,
100                 * we'll just shutdown.
101                 */
102                cio.shutdown();
103            } catch (IOException e) {
104                // ignore
105            }
106
107            cio.close();
108            if (rp != null) {
109                rp.release();
110            }
111        }
112    }
113
114    public void run() {
115        try {
116            service();
117        } catch (IOException x) {
118            x.printStackTrace();
119        }
120    }
121
122    ByteBuffer receive() throws IOException {
123
124        do {} while (!cio.doHandshake());
125
126        for (;;) {
127            int read = cio.read();
128            ByteBuffer bb = cio.getReadBuf();
129            if ((read < 0) || (Request.isComplete(bb))) {
130                bb.flip();
131                return bb;
132            }
133        }
134    }
135
136    Reply build(Request rq) throws IOException {
137
138        Reply rp = null;
139        Request.Action action = rq.action();
140        if ((action != Request.Action.GET) &&
141                (action != Request.Action.HEAD))
142            rp = new Reply(Reply.Code.METHOD_NOT_ALLOWED,
143                           new StringContent(rq.toString()));
144        else
145            rp = new Reply(Reply.Code.OK,
146                           new FileContent(rq.uri()), action);
147        try {
148            rp.prepare();
149        } catch (IOException x) {
150            rp.release();
151            rp = new Reply(Reply.Code.NOT_FOUND,
152                           new StringContent(x));
153            rp.prepare();
154        }
155        return rp;
156    }
157}
158