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1   package org.apache.maven.plugin.internal;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *   http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  import java.util.concurrent.atomic.AtomicReference;
23  import org.apache.maven.execution.MavenSession;
24  import org.apache.maven.plugin.LegacySupport;
25  import org.codehaus.plexus.component.annotations.Component;
26  import org.eclipse.aether.RepositorySystemSession;
27  
28  /**
29   * Helps to provide backward-compatibility with plugins that use legacy components. <strong>Warning:</strong> This is an
30   * internal utility component that is only public for technical reasons, it is not part of the public API. In
31   * particular, this component can be changed or deleted without prior notice.
32   *
33   * @since 3.0
34   * @author Benjamin Bentmann
35   */
36  @Component( role = LegacySupport.class )
37  public class DefaultLegacySupport
38      implements LegacySupport
39  {
40  
41      private static final ThreadLocal<AtomicReference<MavenSession>> SESSION =
42          new InheritableThreadLocal<>();
43  
44      public void setSession( MavenSession session )
45      {
46          AtomicReference<MavenSession> reference = DefaultLegacySupport.SESSION.get();
47          if ( reference != null )
48          {
49              reference.set( null );
50          }
51  
52          if ( session == null && reference != null )
53          {
54              DefaultLegacySupport.SESSION.remove();
55          }
56          else
57          {
58              DefaultLegacySupport.SESSION.set( new AtomicReference<>( session ) );
59          }
60      }
61  
62      public MavenSession getSession()
63      {
64          AtomicReference<MavenSession> currentSession = DefaultLegacySupport.SESSION.get();
65          return currentSession != null ? currentSession.get() : null;
66      }
67  
68      public RepositorySystemSession getRepositorySession()
69      {
70          MavenSession session = getSession();
71          return ( session != null ) ? session.getRepositorySession() : null;
72      }
73  
74  }