001package 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
022import java.util.List;
023
024import org.apache.maven.model.Plugin;
025import org.apache.maven.project.MavenProject;
026import org.eclipse.aether.RepositorySystemSession;
027import org.eclipse.aether.artifact.Artifact;
028import org.eclipse.aether.graph.DependencyFilter;
029import 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 */
039public interface PluginArtifactsCache
040{
041
042    /**
043     * A cache key.
044     */
045    interface Key
046    {
047        // marker interface for cache keys
048    }
049
050    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}