001package org.apache.maven.project;
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.codehaus.plexus.classworlds.realm.ClassRealm;
025import org.eclipse.aether.graph.DependencyFilter;
026
027/**
028 * Caches project class realms. <strong>Warning:</strong> This is an internal utility interface that is only public for
029 * technical reasons, it is not part of the public API. In particular, this interface can be changed or deleted without
030 * prior notice.
031 * 
032 * @author Igor Fedorenko
033 * @author Benjamin Bentmann
034 */
035public interface ProjectRealmCache
036{
037
038    static class CacheRecord
039    {
040
041        public final ClassRealm realm;
042
043        public final DependencyFilter extensionArtifactFilter;
044
045        public CacheRecord( ClassRealm realm, DependencyFilter extensionArtifactFilter )
046        {
047            this.realm = realm;
048            this.extensionArtifactFilter = extensionArtifactFilter;
049        }
050
051    }
052
053    CacheRecord get( List<? extends ClassRealm> extensionRealms );
054
055    CacheRecord put( List<? extends ClassRealm> extensionRealms, ClassRealm projectRealm,
056                     DependencyFilter extensionArtifactFilter );
057
058    void flush();
059
060    /**
061     * Registers the specified cache record for usage with the given project. Integrators can use the information
062     * collected from this method in combination with a custom cache implementation to dispose unused records from the
063     * cache.
064     * 
065     * @param project The project that employs the plugin realm, must not be {@code null}.
066     * @param record The cache record being used for the project, must not be {@code null}.
067     */
068    void register( MavenProject project, CacheRecord record );
069
070}