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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  package org.apache.maven.plugin;
20  
21  import java.util.List;
22  import java.util.Map;
23  
24  import org.apache.maven.artifact.Artifact;
25  import org.apache.maven.model.Plugin;
26  import org.apache.maven.project.MavenProject;
27  import org.codehaus.plexus.classworlds.realm.ClassRealm;
28  import org.eclipse.aether.RepositorySystemSession;
29  import org.eclipse.aether.graph.DependencyFilter;
30  import org.eclipse.aether.repository.RemoteRepository;
31  
32  /**
33   * Caches plugin class realms. <strong>Warning:</strong> This is an internal utility interface that is only public for
34   * technical reasons, it is not part of the public API. In particular, this interface can be changed or deleted without
35   * prior notice.
36   *
37   * @author Igor Fedorenko
38   * @author Benjamin Bentmann
39   */
40  public interface PluginRealmCache {
41      /**
42       * CacheRecord
43       */
44      class CacheRecord {
45          public ClassRealm getRealm() {
46              return realm;
47          }
48  
49          public List<Artifact> getArtifacts() {
50              return artifacts;
51          }
52  
53          private final ClassRealm realm;
54  
55          private final List<Artifact> artifacts;
56  
57          public CacheRecord(ClassRealm realm, List<Artifact> artifacts) {
58              this.realm = realm;
59              this.artifacts = artifacts;
60          }
61      }
62  
63      /**
64       * A cache key.
65       */
66      interface Key {
67          // marker interface for cache keys
68      }
69  
70      Key createKey(
71              Plugin plugin,
72              ClassLoader parentRealm,
73              Map<String, ClassLoader> foreignImports,
74              DependencyFilter dependencyFilter,
75              List<RemoteRepository> repositories,
76              RepositorySystemSession session);
77  
78      CacheRecord get(Key key);
79  
80      CacheRecord put(Key key, ClassRealm pluginRealm, List<Artifact> pluginArtifacts);
81  
82      void flush();
83  
84      /**
85       * Registers the specified cache record for usage with the given project. Integrators can use the information
86       * collected from this method in combination with a custom cache implementation to dispose unused records from the
87       * cache.
88       *
89       * @param project The project that employs the plugin realm, must not be {@code null}.
90       * @param record The cache record being used for the project, must not be {@code null}.
91       */
92      void register(MavenProject project, Key key, CacheRecord record);
93  }