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1   package org.apache.maven.plugin;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *   http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  import java.util.List;
23  
24  import org.apache.maven.project.ExtensionDescriptor;
25  import org.apache.maven.project.MavenProject;
26  import org.codehaus.plexus.classworlds.realm.ClassRealm;
27  import org.eclipse.aether.artifact.Artifact;
28  
29  /**
30   * Caches extension class realms. <strong>Warning:</strong> This is an internal utility interface that is only public
31   * for technical reasons, it is not part of the public API. In particular, this interface can be changed or deleted
32   * without prior notice.
33   * 
34   * @author Igor Fedorenko
35   * @author Benjamin Bentmann
36   */
37  public interface ExtensionRealmCache
38  {
39      /**
40       * A cache key.
41       */
42      interface Key
43      {
44          // marker interface for cache keys
45      }
46  
47      static class CacheRecord
48      {
49  
50          public final ClassRealm realm;
51  
52          public final ExtensionDescriptor desciptor;
53  
54          public CacheRecord( ClassRealm realm, ExtensionDescriptor descriptor )
55          {
56              this.realm = realm;
57              this.desciptor = descriptor;
58          }
59  
60      }
61  
62      Key createKey( List<? extends Artifact> extensionArtifacts );
63  
64      CacheRecord get( Key key );
65  
66      CacheRecord put( Key key, ClassRealm extensionRealm, ExtensionDescriptor extensionDescriptor );
67  
68      void flush();
69  
70      /**
71       * Registers the specified cache record for usage with the given project. Integrators can use the information
72       * collected from this method in combination with a custom cache implementation to dispose unused records from the
73       * cache.
74       * 
75       * @param project The project that employs the plugin realm, must not be {@code null}.
76       * @param record The cache record being used for the project, must not be {@code null}.
77       */
78      void register( MavenProject project, Key key, CacheRecord record );
79  
80  }