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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.ArrayList;
23  import java.util.Collections;
24  import java.util.List;
25  import java.util.Map;
26  import java.util.concurrent.ConcurrentHashMap;
27  
28  import org.apache.maven.artifact.Artifact;
29  import org.apache.maven.model.Plugin;
30  import org.apache.maven.project.MavenProject;
31  import org.codehaus.plexus.classworlds.realm.ClassRealm;
32  import org.codehaus.plexus.classworlds.realm.NoSuchRealmException;
33  import org.codehaus.plexus.component.annotations.Component;
34  import org.codehaus.plexus.personality.plexus.lifecycle.phase.Disposable;
35  import org.eclipse.aether.RepositorySystemSession;
36  import org.eclipse.aether.graph.DependencyFilter;
37  import org.eclipse.aether.repository.LocalRepository;
38  import org.eclipse.aether.repository.RemoteRepository;
39  import org.eclipse.aether.repository.WorkspaceRepository;
40  
41  /**
42   * Default PluginCache implementation. Assumes cached data does not change.
43   */
44  @Component( role = PluginRealmCache.class )
45  public class DefaultPluginRealmCache
46      implements PluginRealmCache, Disposable
47  {
48  
49      protected static class CacheKey
50          implements Key
51      {
52  
53          private final Plugin plugin;
54  
55          private final WorkspaceRepository workspace;
56  
57          private final LocalRepository localRepo;
58  
59          private final List<RemoteRepository> repositories;
60  
61          private final ClassLoader parentRealm;
62  
63          private final Map<String, ClassLoader> foreignImports;
64  
65          private final DependencyFilter filter;
66  
67          private final int hashCode;
68  
69          public CacheKey( Plugin plugin, ClassLoader parentRealm, Map<String, ClassLoader> foreignImports,
70                           DependencyFilter dependencyFilter, List<RemoteRepository> repositories,
71                           RepositorySystemSession session )
72          {
73              this.plugin = plugin.clone();
74              this.workspace = CacheUtils.getWorkspace( session );
75              this.localRepo = session.getLocalRepository();
76              this.repositories = new ArrayList<RemoteRepository>( repositories.size() );
77              for ( RemoteRepository repository : repositories )
78              {
79                  if ( repository.isRepositoryManager() )
80                  {
81                      this.repositories.addAll( repository.getMirroredRepositories() );
82                  }
83                  else
84                  {
85                      this.repositories.add( repository );
86                  }
87              }
88              this.parentRealm = parentRealm;
89              this.foreignImports =
90                  ( foreignImports != null ) ? foreignImports : Collections.<String, ClassLoader>emptyMap();
91              this.filter = dependencyFilter;
92  
93              int hash = 17;
94              hash = hash * 31 + CacheUtils.pluginHashCode( plugin );
95              hash = hash * 31 + hash( workspace );
96              hash = hash * 31 + hash( localRepo );
97              hash = hash * 31 + CacheUtils.repositoriesHashCode( repositories );
98              hash = hash * 31 + hash( parentRealm );
99              hash = hash * 31 + this.foreignImports.hashCode();
100             hash = hash * 31 + hash( dependencyFilter );
101             this.hashCode = hash;
102         }
103 
104         @Override
105         public String toString()
106         {
107             return plugin.getId();
108         }
109 
110         @Override
111         public int hashCode()
112         {
113             return hashCode;
114         }
115 
116         private static int hash( Object obj )
117         {
118             return obj != null ? obj.hashCode() : 0;
119         }
120 
121         @Override
122         public boolean equals( Object o )
123         {
124             if ( o == this )
125             {
126                 return true;
127             }
128 
129             if ( !( o instanceof CacheKey ) )
130             {
131                 return false;
132             }
133 
134             CacheKey that = (CacheKey) o;
135 
136             return parentRealm == that.parentRealm && CacheUtils.pluginEquals( plugin, that.plugin )
137                 && eq( workspace, that.workspace ) && eq( localRepo, that.localRepo )
138                 && CacheUtils.repositoriesEquals( this.repositories, that.repositories ) && eq( filter, that.filter )
139                 && eq( foreignImports, that.foreignImports );
140         }
141 
142         private static <T> boolean eq( T s1, T s2 )
143         {
144             return s1 != null ? s1.equals( s2 ) : s2 == null;
145         }
146 
147     }
148 
149     protected final Map<Key, CacheRecord> cache = new ConcurrentHashMap<Key, CacheRecord>();
150 
151     public Key createKey( Plugin plugin, ClassLoader parentRealm, Map<String, ClassLoader> foreignImports,
152                           DependencyFilter dependencyFilter, List<RemoteRepository> repositories,
153                           RepositorySystemSession session )
154     {
155         return new CacheKey( plugin, parentRealm, foreignImports, dependencyFilter, repositories, session );
156     }
157 
158     public CacheRecord get( Key key )
159     {
160         return cache.get( key );
161     }
162 
163     public CacheRecord put( Key key, ClassRealm pluginRealm, List<Artifact> pluginArtifacts )
164     {
165         if ( pluginRealm == null || pluginArtifacts == null )
166         {
167             throw new IllegalArgumentException();
168         }
169 
170         if ( cache.containsKey( key ) )
171         {
172             throw new IllegalStateException( "Duplicate plugin realm for plugin " + key );
173         }
174 
175         CacheRecord record = new CacheRecord( pluginRealm, pluginArtifacts );
176 
177         cache.put( key, record );
178 
179         return record;
180     }
181 
182     public void flush()
183     {
184         for ( CacheRecord record : cache.values() )
185         {
186             ClassRealm realm = record.realm;
187             try
188             {
189                 realm.getWorld().disposeRealm( realm.getId() );
190             }
191             catch ( NoSuchRealmException e )
192             {
193                 // ignore
194             }
195         }
196         cache.clear();
197     }
198 
199     protected static int pluginHashCode( Plugin plugin )
200     {
201         return CacheUtils.pluginHashCode( plugin );
202     }
203 
204     protected static boolean pluginEquals( Plugin a, Plugin b )
205     {
206         return CacheUtils.pluginEquals( a, b );
207     }
208 
209     public void register( MavenProject project, Key key, CacheRecord record )
210     {
211         // default cache does not track plugin usage
212     }
213 
214     public void dispose()
215     {
216         flush();
217     }
218 
219 }