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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.james.mailrepository.filepair;
21
22 import java.io.InputStream;
23 import java.io.ObjectInputStream;
24 import java.io.ObjectOutputStream;
25 import java.io.OutputStream;
26 import org.apache.avalon.cornerstone.services.store.ObjectRepository;
27 import org.apache.james.util.io.ClassLoaderObjectInputStream;
28
29 /***
30 * This is a simple implementation of persistent object store using
31 * object serialization on the file system.
32 *
33 */
34 public class File_Persistent_Object_Repository
35 extends AbstractFileRepository
36 implements ObjectRepository
37 {
38 protected String getExtensionDecorator()
39 {
40 return ".FileObjectStore";
41 }
42
43 /***
44 * Get the object associated to the given unique key.
45 */
46 public synchronized Object get( final String key )
47 {
48 try
49 {
50 final InputStream inputStream = getInputStream( key );
51
52 if( inputStream == null )
53 throw new NullPointerException("Null input stream returned for key: " + key );
54 try
55 {
56 final ObjectInputStream stream = new ObjectInputStream( inputStream );
57
58 if( stream == null )
59 throw new NullPointerException("Null stream returned for key: " + key );
60
61 final Object object = stream.readObject();
62 if( DEBUG )
63 {
64 getLogger().debug( "returning object " + object + " for key " + key );
65 }
66 return object;
67 }
68 finally
69 {
70 inputStream.close();
71 }
72 }
73 catch( final Throwable e )
74 {
75 throw new RuntimeException(
76 "Exception caught while retrieving an object, cause: " + e.toString() );
77 }
78 }
79
80 public synchronized Object get( final String key, final ClassLoader classLoader )
81 {
82 try
83 {
84 final InputStream inputStream = getInputStream( key );
85
86 if( inputStream == null )
87 throw new NullPointerException("Null input stream returned for key: " + key );
88
89 try
90 {
91 final ObjectInputStream stream = new ClassLoaderObjectInputStream( classLoader, inputStream );
92
93 if( stream == null )
94 throw new NullPointerException("Null stream returned for key: " + key );
95
96 final Object object = stream.readObject();
97
98 if( DEBUG )
99 {
100 getLogger().debug( "returning object " + object + " for key " + key );
101 }
102 return object;
103 }
104 finally
105 {
106 inputStream.close();
107 }
108 }
109 catch( final Throwable e )
110 {
111 throw new RuntimeException( "Exception caught while retrieving an object: " + e );
112 }
113
114 }
115
116 /***
117 * Store the given object and associates it to the given key
118 */
119 public synchronized void put( final String key, final Object value )
120 {
121 try
122 {
123 final OutputStream outputStream = getOutputStream( key );
124
125 try
126 {
127 final ObjectOutputStream stream = new ObjectOutputStream( outputStream );
128 stream.writeObject( value );
129 if( DEBUG ) getLogger().debug( "storing object " + value + " for key " + key );
130 }
131 finally
132 {
133 outputStream.close();
134 }
135 }
136 catch( final Exception e )
137 {
138 throw new RuntimeException( "Exception caught while storing an object: " + e );
139 }
140 }
141
142 }