chris@1
|
1 |
/*
|
chris@1
|
2 |
* SONEWS News Server
|
chris@1
|
3 |
* see AUTHORS for the list of contributors
|
chris@1
|
4 |
*
|
chris@1
|
5 |
* This program is free software: you can redistribute it and/or modify
|
chris@1
|
6 |
* it under the terms of the GNU General Public License as published by
|
chris@1
|
7 |
* the Free Software Foundation, either version 3 of the License, or
|
chris@1
|
8 |
* (at your option) any later version.
|
chris@1
|
9 |
*
|
chris@1
|
10 |
* This program is distributed in the hope that it will be useful,
|
chris@1
|
11 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
chris@1
|
12 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
chris@1
|
13 |
* GNU General Public License for more details.
|
chris@1
|
14 |
*
|
chris@1
|
15 |
* You should have received a copy of the GNU General Public License
|
chris@1
|
16 |
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
chris@1
|
17 |
*/
|
chris@1
|
18 |
|
chris@1
|
19 |
package org.sonews.daemon;
|
chris@1
|
20 |
|
chris@3
|
21 |
import org.sonews.config.Config;
|
chris@3
|
22 |
import org.sonews.Main;
|
chris@1
|
23 |
import org.sonews.util.Log;
|
chris@1
|
24 |
import java.io.IOException;
|
chris@1
|
25 |
import java.net.BindException;
|
chris@1
|
26 |
import java.net.InetSocketAddress;
|
chris@1
|
27 |
import java.net.ServerSocket;
|
chris@1
|
28 |
import java.nio.channels.CancelledKeyException;
|
chris@1
|
29 |
import java.nio.channels.ClosedChannelException;
|
chris@1
|
30 |
import java.nio.channels.SelectionKey;
|
chris@1
|
31 |
import java.nio.channels.Selector;
|
chris@1
|
32 |
import java.nio.channels.ServerSocketChannel;
|
chris@1
|
33 |
import java.nio.channels.SocketChannel;
|
chris@1
|
34 |
|
chris@1
|
35 |
/**
|
chris@1
|
36 |
* NNTP daemon using SelectableChannels.
|
chris@1
|
37 |
* @author Christian Lins
|
chris@1
|
38 |
* @since sonews/0.5.0
|
chris@1
|
39 |
*/
|
chris@1
|
40 |
public final class NNTPDaemon extends AbstractDaemon
|
chris@1
|
41 |
{
|
chris@1
|
42 |
|
cli@37
|
43 |
public static final Object RegisterGate = new Object();
|
cli@37
|
44 |
private static NNTPDaemon instance = null;
|
chris@1
|
45 |
|
cli@37
|
46 |
public static synchronized NNTPDaemon createInstance(int port)
|
cli@37
|
47 |
{
|
cli@37
|
48 |
if (instance == null) {
|
cli@37
|
49 |
instance = new NNTPDaemon(port);
|
cli@37
|
50 |
return instance;
|
cli@37
|
51 |
} else {
|
cli@37
|
52 |
throw new RuntimeException("NNTPDaemon.createInstance() called twice");
|
cli@37
|
53 |
}
|
cli@37
|
54 |
}
|
cli@37
|
55 |
private int port;
|
chris@1
|
56 |
|
cli@37
|
57 |
private NNTPDaemon(final int port)
|
cli@37
|
58 |
{
|
cli@37
|
59 |
Log.get().info("Server listening on port " + port);
|
cli@37
|
60 |
this.port = port;
|
cli@37
|
61 |
}
|
cli@37
|
62 |
|
cli@37
|
63 |
@Override
|
cli@37
|
64 |
public void run()
|
cli@37
|
65 |
{
|
cli@37
|
66 |
try {
|
cli@37
|
67 |
// Create a Selector that handles the SocketChannel multiplexing
|
cli@37
|
68 |
final Selector readSelector = Selector.open();
|
cli@37
|
69 |
final Selector writeSelector = Selector.open();
|
cli@37
|
70 |
|
cli@37
|
71 |
// Start working threads
|
cli@37
|
72 |
final int workerThreads = Runtime.getRuntime().availableProcessors() * 4;
|
cli@37
|
73 |
ConnectionWorker[] cworkers = new ConnectionWorker[workerThreads];
|
cli@37
|
74 |
for (int n = 0; n < workerThreads; n++) {
|
cli@37
|
75 |
cworkers[n] = new ConnectionWorker();
|
cli@37
|
76 |
cworkers[n].start();
|
cli@37
|
77 |
}
|
cli@37
|
78 |
|
cli@37
|
79 |
ChannelWriter.getInstance().setSelector(writeSelector);
|
cli@37
|
80 |
ChannelReader.getInstance().setSelector(readSelector);
|
cli@37
|
81 |
ChannelWriter.getInstance().start();
|
cli@37
|
82 |
ChannelReader.getInstance().start();
|
cli@37
|
83 |
|
cli@37
|
84 |
final ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
|
cli@37
|
85 |
serverSocketChannel.configureBlocking(true); // Set to blocking mode
|
cli@37
|
86 |
|
cli@37
|
87 |
// Configure ServerSocket; bind to socket...
|
cli@37
|
88 |
final ServerSocket serverSocket = serverSocketChannel.socket();
|
cli@37
|
89 |
serverSocket.bind(new InetSocketAddress(this.port));
|
cli@37
|
90 |
|
cli@37
|
91 |
while (isRunning()) {
|
cli@37
|
92 |
SocketChannel socketChannel;
|
cli@37
|
93 |
|
cli@37
|
94 |
try {
|
cli@37
|
95 |
// As we set the server socket channel to blocking mode the accept()
|
cli@37
|
96 |
// method will block.
|
cli@37
|
97 |
socketChannel = serverSocketChannel.accept();
|
cli@37
|
98 |
socketChannel.configureBlocking(false);
|
cli@37
|
99 |
assert socketChannel.isConnected();
|
cli@37
|
100 |
assert socketChannel.finishConnect();
|
cli@37
|
101 |
} catch (IOException ex) {
|
cli@37
|
102 |
// Under heavy load an IOException "Too many open files may
|
cli@37
|
103 |
// be thrown. It most cases we should slow down the connection
|
cli@37
|
104 |
// accepting, to give the worker threads some time to process work.
|
cli@37
|
105 |
Log.get().severe("IOException while accepting connection: " + ex.getMessage());
|
cli@37
|
106 |
Log.get().info("Connection accepting sleeping for seconds...");
|
cli@37
|
107 |
Thread.sleep(5000); // 5 seconds
|
cli@37
|
108 |
continue;
|
cli@37
|
109 |
}
|
cli@37
|
110 |
|
cli@37
|
111 |
final NNTPConnection conn;
|
cli@37
|
112 |
try {
|
cli@37
|
113 |
conn = new NNTPConnection(socketChannel);
|
cli@37
|
114 |
Connections.getInstance().add(conn);
|
cli@37
|
115 |
} catch (IOException ex) {
|
cli@37
|
116 |
Log.get().warning(ex.toString());
|
cli@37
|
117 |
socketChannel.close();
|
cli@37
|
118 |
continue;
|
cli@37
|
119 |
}
|
cli@37
|
120 |
|
cli@37
|
121 |
try {
|
cli@37
|
122 |
SelectionKey selKeyWrite =
|
cli@37
|
123 |
registerSelector(writeSelector, socketChannel, SelectionKey.OP_WRITE);
|
cli@37
|
124 |
registerSelector(readSelector, socketChannel, SelectionKey.OP_READ);
|
cli@37
|
125 |
|
cli@37
|
126 |
Log.get().info("Connected: " + socketChannel.socket().getRemoteSocketAddress());
|
cli@37
|
127 |
|
cli@37
|
128 |
// Set write selection key and send hello to client
|
cli@37
|
129 |
conn.setWriteSelectionKey(selKeyWrite);
|
cli@37
|
130 |
conn.println("200 " + Config.inst().get(Config.HOSTNAME, "localhost")
|
cli@37
|
131 |
+ " " + Main.VERSION + " news server ready - (posting ok).");
|
cli@37
|
132 |
} catch (CancelledKeyException cke) {
|
cli@37
|
133 |
Log.get().warning("CancelledKeyException " + cke.getMessage() + " was thrown: "
|
cli@37
|
134 |
+ socketChannel.socket());
|
cli@37
|
135 |
} catch (ClosedChannelException cce) {
|
cli@37
|
136 |
Log.get().warning("ClosedChannelException " + cce.getMessage() + " was thrown: "
|
cli@37
|
137 |
+ socketChannel.socket());
|
cli@37
|
138 |
}
|
cli@37
|
139 |
}
|
cli@37
|
140 |
} catch (BindException ex) {
|
cli@37
|
141 |
// Could not bind to socket; this is a fatal problem; so perform shutdown
|
cli@37
|
142 |
ex.printStackTrace();
|
cli@37
|
143 |
System.exit(1);
|
cli@37
|
144 |
} catch (IOException ex) {
|
cli@37
|
145 |
ex.printStackTrace();
|
cli@37
|
146 |
} catch (Exception ex) {
|
cli@37
|
147 |
ex.printStackTrace();
|
cli@37
|
148 |
}
|
cli@37
|
149 |
}
|
cli@37
|
150 |
|
cli@37
|
151 |
public static SelectionKey registerSelector(final Selector selector,
|
cli@37
|
152 |
final SocketChannel channel, final int op)
|
cli@37
|
153 |
throws CancelledKeyException, ClosedChannelException
|
cli@37
|
154 |
{
|
cli@37
|
155 |
// Register the selector at the channel, so that it will be notified
|
cli@37
|
156 |
// on the socket's events
|
cli@37
|
157 |
synchronized (RegisterGate) {
|
cli@37
|
158 |
// Wakeup the currently blocking reader/writer thread; we have locked
|
cli@37
|
159 |
// the RegisterGate to prevent the awakened thread to block again
|
cli@37
|
160 |
selector.wakeup();
|
cli@37
|
161 |
|
cli@37
|
162 |
// Lock the selector to prevent the waiting worker threads going into
|
cli@37
|
163 |
// selector.select() which would block the selector.
|
cli@37
|
164 |
synchronized (selector) {
|
cli@37
|
165 |
return channel.register(selector, op, null);
|
cli@37
|
166 |
}
|
cli@37
|
167 |
}
|
cli@37
|
168 |
}
|
chris@1
|
169 |
}
|