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1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one
3    *  or more contributor license agreements.  See the NOTICE file
4    *  distributed with this work for additional information
5    *  regarding copyright ownership.  The ASF licenses this file
6    *  to you under the Apache License, Version 2.0 (the
7    *  "License"); you may not use this file except in compliance
8    *  with the License.  You may obtain a copy of the License at
9    *
10   *    http://www.apache.org/licenses/LICENSE-2.0
11   *
12   *  Unless required by applicable law or agreed to in writing,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License.
18   *
19   */
20  package org.apache.mina.transport.vmpipe;
21  
22  import java.io.IOException;
23  import java.net.SocketAddress;
24  import java.util.HashMap;
25  import java.util.HashSet;
26  import java.util.List;
27  import java.util.Map;
28  import java.util.Set;
29  import java.util.concurrent.Executor;
30  
31  import org.apache.mina.core.future.IoFuture;
32  import org.apache.mina.core.service.AbstractIoAcceptor;
33  import org.apache.mina.core.service.IoHandler;
34  import org.apache.mina.core.service.TransportMetadata;
35  import org.apache.mina.core.session.IdleStatusChecker;
36  import org.apache.mina.core.session.IoSession;
37  
38  /**
39   * Binds the specified {@link IoHandler} to the specified
40   * {@link VmPipeAddress}.
41   *
42   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
43   */
44  public final class VmPipeAcceptor extends AbstractIoAcceptor {
45  
46      // object used for checking session idle
47      private IdleStatusChecker idleChecker;
48  
49      static final Map<VmPipeAddress, VmPipe> boundHandlers = new HashMap<VmPipeAddress, VmPipe>();
50  
51      /**
52       * Creates a new instance.
53       */
54      public VmPipeAcceptor() {
55          this(null);
56      }
57  
58      /**
59       * Creates a new instance.
60       */
61      public VmPipeAcceptor(Executor executor) {
62          super(new DefaultVmPipeSessionConfig(), executor);
63          idleChecker = new IdleStatusChecker();
64          // we schedule the idle status checking task in this service exceutor
65          // it will be woke up every seconds
66          executeWorker(idleChecker.getNotifyingTask(), "idleStatusChecker");
67      }
68  
69      public TransportMetadata getTransportMetadata() {
70          return VmPipeSession.METADATA;
71      }
72  
73      /**
74       * {@inheritDoc}
75       */
76      public VmPipeSessionConfig getSessionConfig() {
77          return (VmPipeSessionConfig) sessionConfig;
78      }
79  
80      @Override
81      public VmPipeAddress getLocalAddress() {
82          return (VmPipeAddress) super.getLocalAddress();
83      }
84  
85      @Override
86      public VmPipeAddress getDefaultLocalAddress() {
87          return (VmPipeAddress) super.getDefaultLocalAddress();
88      }
89  
90      // This method is overriden to work around a problem with
91      // bean property access mechanism.
92  
93      public void setDefaultLocalAddress(VmPipeAddress localAddress) {
94          super.setDefaultLocalAddress(localAddress);
95      }
96  
97      @Override
98      protected void dispose0() throws Exception {
99          // stop the idle checking task
100         idleChecker.getNotifyingTask().cancel();
101         unbind();
102     }
103 
104     @Override
105     protected Set<SocketAddress> bindInternal(List<? extends SocketAddress> localAddresses) throws IOException {
106         Set<SocketAddress> newLocalAddresses = new HashSet<SocketAddress>();
107 
108         synchronized (boundHandlers) {
109             for (SocketAddress a : localAddresses) {
110                 VmPipeAddress localAddress = (VmPipeAddress) a;
111                 if (localAddress == null || localAddress.getPort() == 0) {
112                     localAddress = null;
113                     for (int i = 10000; i < Integer.MAX_VALUE; i++) {
114                         VmPipeAddress newLocalAddress = new VmPipeAddress(i);
115                         if (!boundHandlers.containsKey(newLocalAddress) && !newLocalAddresses.contains(newLocalAddress)) {
116                             localAddress = newLocalAddress;
117                             break;
118                         }
119                     }
120 
121                     if (localAddress == null) {
122                         throw new IOException("No port available.");
123                     }
124                 } else if (localAddress.getPort() < 0) {
125                     throw new IOException("Bind port number must be 0 or above.");
126                 } else if (boundHandlers.containsKey(localAddress)) {
127                     throw new IOException("Address already bound: " + localAddress);
128                 }
129 
130                 newLocalAddresses.add(localAddress);
131             }
132 
133             for (SocketAddress a : newLocalAddresses) {
134                 VmPipeAddress localAddress = (VmPipeAddress) a;
135                 if (!boundHandlers.containsKey(localAddress)) {
136                     boundHandlers.put(localAddress, new VmPipe(this, localAddress, getHandler(), getListeners()));
137                 } else {
138                     for (SocketAddress a2 : newLocalAddresses) {
139                         boundHandlers.remove(a2);
140                     }
141                     throw new IOException("Duplicate local address: " + a);
142                 }
143             }
144         }
145 
146         return newLocalAddresses;
147     }
148 
149     @Override
150     protected void unbind0(List<? extends SocketAddress> localAddresses) {
151         synchronized (boundHandlers) {
152             for (SocketAddress a : localAddresses) {
153                 boundHandlers.remove(a);
154             }
155         }
156     }
157 
158     public IoSession newSession(SocketAddress remoteAddress, SocketAddress localAddress) {
159         throw new UnsupportedOperationException();
160     }
161 
162     void doFinishSessionInitialization(IoSession session, IoFuture future) {
163         initSession(session, future, null);
164     }
165 }