1 /***
2 * Redistribution and use in source and binary forms, with or without
3 * modification, are permitted provided that the following conditions are
4 * met :
5 *
6 * . Redistributions of source code must retain the above copyright
7 * notice, this list of conditions and the following disclaimer.
8 *
9 * . Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * . The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
25 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $Id: ChannelManager.java,v 1.6 2005/09/03 23:11:42 mat007 Exp $
29 */
30
31 package jtge.engine.io;
32
33 import java.util.Iterator;
34 import java.util.Vector;
35
36 /***
37 * Maintains a link between inputs and outputs.
38 * <p>
39 * A channel is simply the association of an input and an output.
40 * <p>
41 * The manager closes both input and ouput when one of them is closed.
42 *
43 * @author Mathieu Champlon
44 * @version $Revision: 1.6 $ $Date: 2005/09/03 23:11:42 $
45 */
46 public class ChannelManager implements ISessionManager
47 {
48 private final Vector inputs;
49 private final Vector outputs;
50 private final Vector views;
51
52 /***
53 * Create a channel manager.
54 */
55 public ChannelManager()
56 {
57 inputs = new Vector();
58 outputs = new Vector();
59 views = new Vector();
60 }
61
62 /***
63 * Register a channel observer.
64 *
65 * @param observer the observer
66 */
67 public final void register( final IChannelObserver observer )
68 {
69 if( observer != null )
70 views.add( observer );
71 }
72
73 /***
74 * Register a status observer.
75 *
76 * @param observer the observer
77 */
78 public final void register( final IStatusObserver observer )
79 {
80 if( observer != null )
81 views.add( new ChannelObserverAdapter( observer ) );
82 }
83
84 private void connected( final IInput input, final IOutput output )
85 {
86 final Iterator iterator = views.iterator();
87 while( iterator.hasNext() )
88 ((IChannelObserver)iterator.next()).connected( input, output );
89 }
90
91 private void disconnected( final IInput input, final IOutput output )
92 {
93 final Iterator iterator = views.iterator();
94 while( iterator.hasNext() )
95 ((IChannelObserver)iterator.next()).disconnected( input, output );
96 }
97
98 /***
99 * {@inheritDoc}
100 */
101 public final void opened( final IInput input, final IOutput output )
102 {
103 if( input == null )
104 throw new IllegalArgumentException( "argument 'input' is null" );
105 if( output == null )
106 throw new IllegalArgumentException( "argument 'output' is null" );
107 inputs.add( input );
108 outputs.add( output );
109 connected( input, output );
110 }
111
112 /***
113 * {@inheritDoc}
114 */
115 public final void closed( final IInput input )
116 {
117 remove( inputs.indexOf( input ) );
118 }
119
120 /***
121 * {@inheritDoc}
122 */
123 public final void closed( final IOutput output )
124 {
125 remove( outputs.indexOf( output ) );
126 }
127
128 private void remove( final int index )
129 {
130 if( index != -1 )
131 {
132 final IInput input = (IInput)inputs.remove( index );
133 final IOutput output = (IOutput)outputs.remove( index );
134 input.close();
135 output.close();
136 disconnected( input, output );
137 }
138 }
139
140 /***
141 * Close all inputs and outputs.
142 */
143 public final void close()
144 {
145 Iterator iterator = ((Vector)outputs.clone()).iterator();
146 while( iterator.hasNext() )
147 ((IOutput)iterator.next()).close();
148 iterator = ((Vector)inputs.clone()).iterator();
149 while( iterator.hasNext() )
150 ((IInput)iterator.next()).close();
151 }
152 }