001    package org.apache.maven.plugin.internal;
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.concurrent.atomic.AtomicReference;
023    import org.apache.maven.execution.MavenSession;
024    import org.apache.maven.plugin.LegacySupport;
025    import org.codehaus.plexus.component.annotations.Component;
026    import org.eclipse.aether.RepositorySystemSession;
027    
028    /**
029     * Helps to provide backward-compatibility with plugins that use legacy components. <strong>Warning:</strong> This is an
030     * internal utility component that is only public for technical reasons, it is not part of the public API. In
031     * particular, this component can be changed or deleted without prior notice.
032     * 
033     * @since 3.0
034     * @author Benjamin Bentmann
035     */
036    @Component( role = LegacySupport.class )
037    public class DefaultLegacySupport
038        implements LegacySupport
039    {
040    
041        private static final ThreadLocal<AtomicReference<MavenSession>> SESSION = new InheritableThreadLocal<AtomicReference<MavenSession>>();
042    
043        public void setSession( MavenSession session )
044        {
045            AtomicReference<MavenSession> reference = DefaultLegacySupport.SESSION.get();
046            if ( reference != null )
047            {
048                reference.set( null );
049            }
050    
051            if ( session == null && reference != null )
052            {
053                DefaultLegacySupport.SESSION.remove();
054            }
055            else
056            {
057                DefaultLegacySupport.SESSION.set( new AtomicReference<MavenSession>( session ) );
058            }
059        }
060    
061        public MavenSession getSession()
062        {
063            AtomicReference<MavenSession> currentSession = DefaultLegacySupport.SESSION.get();
064            return currentSession != null ? currentSession.get() : null;
065        }
066    
067        public RepositorySystemSession getRepositorySession()
068        {
069            MavenSession session = getSession();
070            return ( session != null ) ? session.getRepositorySession() : null;
071        }
072    
073    }