001    package org.apache.maven.plugin;
002    
003    /*
004     * Licensed to the Apache Software Foundation (ASF) under one
005     * or more contributor license agreements.  See the NOTICE file
006     * distributed with this work for additional information
007     * regarding copyright ownership.  The ASF licenses this file
008     * to you under the Apache License, Version 2.0 (the
009     * "License"); you may not use this file except in compliance
010     * with the License.  You may obtain a copy of the License at
011     *
012     *   http://www.apache.org/licenses/LICENSE-2.0
013     *
014     * Unless required by applicable law or agreed to in writing,
015     * software distributed under the License is distributed on an
016     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017     * KIND, either express or implied.  See the License for the
018     * specific language governing permissions and limitations
019     * under the License.
020     */
021    
022    import java.util.ArrayList;
023    import java.util.Collections;
024    import java.util.HashMap;
025    import java.util.List;
026    import java.util.Map;
027    
028    import org.apache.maven.model.Plugin;
029    import org.apache.maven.project.MavenProject;
030    import org.codehaus.plexus.component.annotations.Component;
031    import org.eclipse.aether.RepositorySystemSession;
032    import org.eclipse.aether.artifact.Artifact;
033    import org.eclipse.aether.graph.DependencyFilter;
034    import org.eclipse.aether.repository.LocalRepository;
035    import org.eclipse.aether.repository.RemoteRepository;
036    import org.eclipse.aether.repository.WorkspaceRepository;
037    
038    /**
039     * @author Igor Fedorenko
040     * @author Benjamin Bentmann
041     */
042    @Component( role = PluginArtifactsCache.class )
043    public class DefaultPluginArtifactsCache
044        implements PluginArtifactsCache
045    {
046    
047        private static class CacheKey
048            implements Key
049        {
050    
051            private final Plugin plugin;
052    
053            private final WorkspaceRepository workspace;
054    
055            private final LocalRepository localRepo;
056    
057            private final List<RemoteRepository> repositories;
058    
059            private final DependencyFilter filter;
060    
061            private final int hashCode;
062    
063            public CacheKey( Plugin plugin, DependencyFilter extensionFilter, List<RemoteRepository> repositories,
064                             RepositorySystemSession session )
065            {
066                this.plugin = plugin.clone();
067                workspace = CacheUtils.getWorkspace( session );
068                this.localRepo = session.getLocalRepository();
069                this.repositories = new ArrayList<RemoteRepository>( repositories.size() );
070                for ( RemoteRepository repository : repositories )
071                {
072                    if ( repository.isRepositoryManager() )
073                    {
074                        this.repositories.addAll( repository.getMirroredRepositories() );
075                    }
076                    else
077                    {
078                        this.repositories.add( repository );
079                    }
080                }
081                this.filter = extensionFilter;
082    
083                int hash = 17;
084                hash = hash * 31 + CacheUtils.pluginHashCode( plugin );
085                hash = hash * 31 + hash( workspace );
086                hash = hash * 31 + hash( localRepo );
087                hash = hash * 31 + CacheUtils.repositoriesHashCode( repositories );
088                hash = hash * 31 + hash( extensionFilter );
089                this.hashCode = hash;
090            }
091    
092            @Override
093            public String toString()
094            {
095                return plugin.getId();
096            }
097    
098            @Override
099            public int hashCode()
100            {
101                return hashCode;
102            }
103    
104            private static int hash( Object obj )
105            {
106                return obj != null ? obj.hashCode() : 0;
107            }
108    
109            @Override
110            public boolean equals( Object o )
111            {
112                if ( o == this )
113                {
114                    return true;
115                }
116    
117                if ( !( o instanceof CacheKey ) )
118                {
119                    return false;
120                }
121    
122                CacheKey that = (CacheKey) o;
123    
124                return CacheUtils.pluginEquals( plugin, that.plugin ) && eq( workspace, that.workspace )
125                    && eq( localRepo, that.localRepo ) && CacheUtils.repositoriesEquals( repositories, that.repositories )
126                    && eq( filter, that.filter );
127            }
128    
129            private static <T> boolean eq( T s1, T s2 )
130            {
131                return s1 != null ? s1.equals( s2 ) : s2 == null;
132            }
133    
134        }
135    
136        protected final Map<Key, CacheRecord> cache = new HashMap<Key, CacheRecord>();
137    
138        public Key createKey( Plugin plugin, DependencyFilter extensionFilter, List<RemoteRepository> repositories,
139                              RepositorySystemSession session )
140        {
141            return new CacheKey( plugin, extensionFilter, repositories, session );
142        }
143    
144        public CacheRecord get( Key key )
145            throws PluginResolutionException
146        {
147            CacheRecord cacheRecord = cache.get( key );
148    
149            if ( cacheRecord != null && cacheRecord.exception != null )
150            {
151                throw cacheRecord.exception;
152            }
153    
154            return cacheRecord;
155        }
156    
157        public CacheRecord put( Key key, List<Artifact> pluginArtifacts )
158        {
159            if ( pluginArtifacts == null )
160            {
161                throw new NullPointerException();
162            }
163    
164            assertUniqueKey( key );
165    
166            CacheRecord record =
167                new CacheRecord( Collections.unmodifiableList( new ArrayList<Artifact>( pluginArtifacts ) ) );
168    
169            cache.put( key, record );
170    
171            return record;
172        }
173    
174        protected void assertUniqueKey( Key key )
175        {
176            if ( cache.containsKey( key ) )
177            {
178                throw new IllegalStateException( "Duplicate artifact resolution result for plugin " + key );
179            }
180        }
181    
182        public CacheRecord put( Key key, PluginResolutionException exception )
183        {
184            if ( exception == null )
185            {
186                throw new NullPointerException();
187            }
188    
189            assertUniqueKey( key );
190    
191            CacheRecord record = new CacheRecord( exception );
192    
193            cache.put( key, record );
194    
195            return record;
196        }
197    
198        public void flush()
199        {
200            cache.clear();
201        }
202    
203        protected static int pluginHashCode( Plugin plugin )
204        {
205            return CacheUtils.pluginHashCode( plugin );
206        }
207    
208        protected static boolean pluginEquals( Plugin a, Plugin b )
209        {
210            return CacheUtils.pluginEquals( a, b );
211        }
212    
213        public void register( MavenProject project, CacheRecord record )
214        {
215            // default cache does not track record usage
216        }
217    
218    }