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 |
|
chris@1
|
43 |
public static final Object RegisterGate = new Object();
|
chris@1
|
44 |
|
chris@1
|
45 |
private static NNTPDaemon instance = null;
|
chris@1
|
46 |
|
chris@1
|
47 |
public static synchronized NNTPDaemon createInstance(int port)
|
chris@1
|
48 |
{
|
chris@1
|
49 |
if(instance == null)
|
chris@1
|
50 |
{
|
chris@1
|
51 |
instance = new NNTPDaemon(port);
|
chris@1
|
52 |
return instance;
|
chris@1
|
53 |
}
|
chris@1
|
54 |
else
|
chris@1
|
55 |
{
|
chris@1
|
56 |
throw new RuntimeException("NNTPDaemon.createInstance() called twice");
|
chris@1
|
57 |
}
|
chris@1
|
58 |
}
|
chris@1
|
59 |
|
chris@1
|
60 |
private int port;
|
chris@1
|
61 |
|
chris@1
|
62 |
private NNTPDaemon(final int port)
|
chris@1
|
63 |
{
|
chris@1
|
64 |
Log.msg("Server listening on port " + port, false);
|
chris@1
|
65 |
this.port = port;
|
chris@1
|
66 |
}
|
chris@1
|
67 |
|
chris@1
|
68 |
@Override
|
chris@1
|
69 |
public void run()
|
chris@1
|
70 |
{
|
chris@1
|
71 |
try
|
chris@1
|
72 |
{
|
chris@1
|
73 |
// Create a Selector that handles the SocketChannel multiplexing
|
chris@1
|
74 |
final Selector readSelector = Selector.open();
|
chris@1
|
75 |
final Selector writeSelector = Selector.open();
|
chris@1
|
76 |
|
chris@1
|
77 |
// Start working threads
|
chris@1
|
78 |
final int workerThreads = Runtime.getRuntime().availableProcessors() * 4;
|
chris@1
|
79 |
ConnectionWorker[] cworkers = new ConnectionWorker[workerThreads];
|
chris@1
|
80 |
for(int n = 0; n < workerThreads; n++)
|
chris@1
|
81 |
{
|
chris@1
|
82 |
cworkers[n] = new ConnectionWorker();
|
chris@1
|
83 |
cworkers[n].start();
|
chris@1
|
84 |
}
|
chris@1
|
85 |
|
chris@1
|
86 |
ChannelWriter.getInstance().setSelector(writeSelector);
|
chris@1
|
87 |
ChannelReader.getInstance().setSelector(readSelector);
|
chris@1
|
88 |
ChannelWriter.getInstance().start();
|
chris@1
|
89 |
ChannelReader.getInstance().start();
|
chris@1
|
90 |
|
chris@1
|
91 |
final ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
|
chris@1
|
92 |
serverSocketChannel.configureBlocking(true); // Set to blocking mode
|
chris@1
|
93 |
|
chris@1
|
94 |
// Configure ServerSocket; bind to socket...
|
chris@1
|
95 |
final ServerSocket serverSocket = serverSocketChannel.socket();
|
chris@1
|
96 |
serverSocket.bind(new InetSocketAddress(this.port));
|
chris@1
|
97 |
|
chris@1
|
98 |
while(isRunning())
|
chris@1
|
99 |
{
|
chris@1
|
100 |
SocketChannel socketChannel;
|
chris@1
|
101 |
|
chris@1
|
102 |
try
|
chris@1
|
103 |
{
|
chris@1
|
104 |
// As we set the server socket channel to blocking mode the accept()
|
chris@1
|
105 |
// method will block.
|
chris@1
|
106 |
socketChannel = serverSocketChannel.accept();
|
chris@1
|
107 |
socketChannel.configureBlocking(false);
|
chris@1
|
108 |
assert socketChannel.isConnected();
|
chris@1
|
109 |
assert socketChannel.finishConnect();
|
chris@1
|
110 |
}
|
chris@1
|
111 |
catch(IOException ex)
|
chris@1
|
112 |
{
|
chris@1
|
113 |
// Under heavy load an IOException "Too many open files may
|
chris@1
|
114 |
// be thrown. It most cases we should slow down the connection
|
chris@1
|
115 |
// accepting, to give the worker threads some time to process work.
|
chris@1
|
116 |
Log.msg("IOException while accepting connection: " + ex.getMessage(), false);
|
chris@1
|
117 |
Log.msg("Connection accepting sleeping for seconds...", true);
|
chris@1
|
118 |
Thread.sleep(5000); // 5 seconds
|
chris@1
|
119 |
continue;
|
chris@1
|
120 |
}
|
chris@1
|
121 |
|
chris@1
|
122 |
final NNTPConnection conn;
|
chris@1
|
123 |
try
|
chris@1
|
124 |
{
|
chris@1
|
125 |
conn = new NNTPConnection(socketChannel);
|
chris@1
|
126 |
Connections.getInstance().add(conn);
|
chris@1
|
127 |
}
|
chris@1
|
128 |
catch(IOException ex)
|
chris@1
|
129 |
{
|
chris@1
|
130 |
Log.msg(ex.getLocalizedMessage(), false);
|
chris@1
|
131 |
socketChannel.close();
|
chris@1
|
132 |
continue;
|
chris@1
|
133 |
}
|
chris@1
|
134 |
|
chris@1
|
135 |
try
|
chris@1
|
136 |
{
|
chris@1
|
137 |
SelectionKey selKeyWrite =
|
chris@1
|
138 |
registerSelector(writeSelector, socketChannel, SelectionKey.OP_WRITE);
|
chris@1
|
139 |
registerSelector(readSelector, socketChannel, SelectionKey.OP_READ);
|
chris@1
|
140 |
|
chris@1
|
141 |
Log.msg("Connected: " + socketChannel.socket().getRemoteSocketAddress(), true);
|
chris@1
|
142 |
|
chris@1
|
143 |
// Set write selection key and send hello to client
|
chris@1
|
144 |
conn.setWriteSelectionKey(selKeyWrite);
|
chris@3
|
145 |
conn.println("200 " + Config.inst().get(Config.HOSTNAME, "localhost")
|
chris@1
|
146 |
+ " " + Main.VERSION + " news server ready - (posting ok).");
|
chris@1
|
147 |
}
|
chris@1
|
148 |
catch(CancelledKeyException cke)
|
chris@1
|
149 |
{
|
chris@1
|
150 |
Log.msg("CancelledKeyException " + cke.getMessage() + " was thrown: "
|
chris@1
|
151 |
+ socketChannel.socket(), false);
|
chris@1
|
152 |
}
|
chris@1
|
153 |
catch(ClosedChannelException cce)
|
chris@1
|
154 |
{
|
chris@1
|
155 |
Log.msg("ClosedChannelException " + cce.getMessage() + " was thrown: "
|
chris@1
|
156 |
+ socketChannel.socket(), false);
|
chris@1
|
157 |
}
|
chris@1
|
158 |
}
|
chris@1
|
159 |
}
|
chris@1
|
160 |
catch(BindException ex)
|
chris@1
|
161 |
{
|
chris@1
|
162 |
// Could not bind to socket; this is a fatal problem; so perform shutdown
|
chris@1
|
163 |
ex.printStackTrace();
|
chris@1
|
164 |
System.exit(1);
|
chris@1
|
165 |
}
|
chris@1
|
166 |
catch(IOException ex)
|
chris@1
|
167 |
{
|
chris@1
|
168 |
ex.printStackTrace();
|
chris@1
|
169 |
}
|
chris@1
|
170 |
catch(Exception ex)
|
chris@1
|
171 |
{
|
chris@1
|
172 |
ex.printStackTrace();
|
chris@1
|
173 |
}
|
chris@1
|
174 |
}
|
chris@1
|
175 |
|
chris@1
|
176 |
public static SelectionKey registerSelector(final Selector selector,
|
chris@1
|
177 |
final SocketChannel channel, final int op)
|
chris@1
|
178 |
throws CancelledKeyException, ClosedChannelException
|
chris@1
|
179 |
{
|
chris@1
|
180 |
// Register the selector at the channel, so that it will be notified
|
chris@1
|
181 |
// on the socket's events
|
chris@1
|
182 |
synchronized(RegisterGate)
|
chris@1
|
183 |
{
|
chris@1
|
184 |
// Wakeup the currently blocking reader/writer thread; we have locked
|
chris@1
|
185 |
// the RegisterGate to prevent the awakened thread to block again
|
chris@1
|
186 |
selector.wakeup();
|
chris@1
|
187 |
|
chris@1
|
188 |
// Lock the selector to prevent the waiting worker threads going into
|
chris@1
|
189 |
// selector.select() which would block the selector.
|
chris@1
|
190 |
synchronized (selector)
|
chris@1
|
191 |
{
|
chris@1
|
192 |
return channel.register(selector, op, null);
|
chris@1
|
193 |
}
|
chris@1
|
194 |
}
|
chris@1
|
195 |
}
|
chris@1
|
196 |
|
chris@1
|
197 |
}
|