ServiceToken


1   // Copyright 2005 The Apache Software Foundation
2   //
3   // Licensed under the Apache License, Version 2.0 (the "License");
4   // you may not use this file except in compliance with the License.
5   // You may obtain a copy of the License at
6   //
7   //     http://www.apache.org/licenses/LICENSE-2.0
8   //
9   // Unless required by applicable law or agreed to in writing, software
10  // distributed under the License is distributed on an "AS IS" BASIS,
11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  package org.apache.hivemind.internal.ser;
16  
17  import java.io.Externalizable  ;
18  import java.io.IOException  ;
19  import java.io.ObjectInput  ;
20  import java.io.ObjectOutput  ;
21  
22  import org.apache.hivemind.util.Defense;
23  
24  /**
25   * Instance used to replace actual service (proxies) during serialization. Note that this represents
26   * a back-door into HiveMind's {@link org.apache.hivemind.internal.RegistryInfrastructure}, which
27   * is less than ideal, and should not be used by end-user code!
28   * 
29   * @author Howard M. Lewis Ship
30   * @since 1.1
31   */
32  public class ServiceToken implements Externalizable  
33  {
34      private static final long serialVersionUID = 1L;
35      private String   _serviceId;
36  
37      // Needed for Externalizable.
38  
39      public ServiceToken()
40      {
41      }
42  
43      public ServiceToken(String   serviceId)
44      {
45          Defense.notNull(serviceId, "serviceId");
46  
47          _serviceId = serviceId;
48      }
49  
50      public String   getServiceId()
51      {
52          return _serviceId;
53      }
54  
55      public void writeExternal(ObjectOutput   out) throws IOException  
56      {
57          out.writeUTF(_serviceId);
58      }
59  
60      public void readExternal(ObjectInput   in) throws IOException  , ClassNotFoundException  
61      {
62          _serviceId = in.readUTF();
63      }
64  
65      Object   readResolve()
66      {
67          return ServiceSerializationHelper.getServiceSerializationSupport()
68                  .getServiceFromToken(this);
69      }
70  }
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