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.List;
023    
024    import org.apache.maven.model.Plugin;
025    import org.apache.maven.project.MavenProject;
026    import org.eclipse.aether.RepositorySystemSession;
027    import org.eclipse.aether.artifact.Artifact;
028    import org.eclipse.aether.graph.DependencyFilter;
029    import org.eclipse.aether.repository.RemoteRepository;
030    
031    /**
032     * Caches plugin artifacts. <strong>Warning:</strong> This is an internal utility interface that is only public for
033     * technical reasons, it is not part of the public API. In particular, this interface can be changed or deleted without
034     * prior notice.
035     * 
036     * @author Igor Fedorenko
037     * @author Benjamin Bentmann
038     */
039    public interface PluginArtifactsCache
040    {
041    
042        /**
043         * A cache key.
044         */
045        interface Key
046        {
047            // marker interface for cache keys
048        }
049    
050        public static class CacheRecord
051        {
052    
053            public final List<Artifact> artifacts;
054    
055            public final PluginResolutionException exception; 
056    
057            public CacheRecord( List<Artifact> artifacts )
058            {
059                this.artifacts = artifacts;
060                this.exception = null;
061            }
062    
063            public CacheRecord( PluginResolutionException exception )
064            {
065                this.artifacts = null;
066                this.exception = exception;
067            }
068        }
069    
070        Key createKey( Plugin plugin, DependencyFilter extensionFilter, List<RemoteRepository> repositories,
071                       RepositorySystemSession session );
072    
073        CacheRecord get( Key key ) throws PluginResolutionException;
074    
075        CacheRecord put( Key key, List<Artifact> pluginArtifacts );
076    
077        CacheRecord put( Key key, PluginResolutionException e );
078    
079        void flush();
080    
081        /**
082         * Registers the specified cache record for usage with the given project. Integrators can use the information
083         * collected from this method in combination with a custom cache implementation to dispose unused records from the
084         * cache.
085         * 
086         * @param project The project that employs the plugin realm, must not be {@code null}.
087         * @param record The cache record being used for the project, must not be {@code null}.
088         */
089        void register( MavenProject project, CacheRecord record );
090    
091    }