package org.apache.maven.lifecycle.internal;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *  http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.artifact.handler.ArtifactHandler;
  import org.apache.maven.artifact.metadata.ArtifactMetadata;
  import org.apache.maven.artifact.repository.ArtifactRepository;
  import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
  import org.apache.maven.artifact.versioning.ArtifactVersion;
  import org.apache.maven.artifact.versioning.OverConstrainedVersionException;
  import org.apache.maven.artifact.versioning.VersionRange;
  
  import java.io.File;
  import java.util.Collection;
  import java.util.List;
  import java.util.concurrent.CountDownLatch;
  
  /**
   * An artifact that conditionally suspends on getFile for anything but the thread it is locked to.
   * 
   * @since 3.0
   */
  class ThreadLockedArtifact
      implements Artifact
  {
      private final Artifact real;
  
      private final CountDownLatch artifactLocked = new CountDownLatch( 1 );
  
      ThreadLockedArtifact( Artifact real )
      {
          this.real = real;
      }
  
      public boolean hasReal()
      {
          return real != null
              && ( !( real instanceof ThreadLockedArtifact ) || ( (ThreadLockedArtifact) real ).hasReal() );
      }
  
      public String getGroupId()
      {
          return real.getGroupId();
      }
  
      public String getArtifactId()
      {
          return real.getArtifactId();
      }
  
      public String getVersion()
      {
          return real.getVersion();
      }
  
      public void setVersion( String version )
      {
          real.setVersion( version );
      }
  
      public String getScope()
      {
          return real.getScope();
      }
  
      public String getType()
      {
          return real.getType();
      }
  
      public String getClassifier()
      {
          return real.getClassifier();
      }
  
      public boolean hasClassifier()
      {
          return real.hasClassifier();
      }
  
      private static final InheritableThreadLocal<ThreadLockedArtifact> THREAD_ARTIFACT =
         new InheritableThreadLocal<ThreadLockedArtifact>();
 
     public void attachToThread()
     {
         THREAD_ARTIFACT.set( this );
     }
 
     public File getFile()
     {
         final ThreadLockedArtifact lockedArtifact = THREAD_ARTIFACT.get();
         if ( lockedArtifact != null && this != lockedArtifact && mustLock() )
         {
             try
             {
                 artifactLocked.await();
             }
             catch ( InterruptedException e )
             {
                 // Ignore and go on to real.getFile();
             }
         }
         return real.getFile();
     }
 
     private boolean mustLock()
     {
         boolean dontNeedLock = CurrentPhaseForThread.isPhase( "compile" ) || CurrentPhaseForThread.isPhase( "test" );
         return !dontNeedLock;
     }
 
     public void setFile( File destination )
     {
         if ( destination != null && destination.exists() && destination.isFile() )
         {
             artifactLocked.countDown();
         }
         real.setFile( destination );
     }
 
     public String getBaseVersion()
     {
         return real.getBaseVersion();
     }
 
     public void setBaseVersion( String baseVersion )
     {
         real.setBaseVersion( baseVersion );
     }
 
     public String getId()
     {
         return real.getId();
     }
 
     public String getDependencyConflictId()
     {
         return real.getDependencyConflictId();
     }
 
     public void addMetadata( ArtifactMetadata metadata )
     {
         real.addMetadata( metadata );
     }
 
     public Collection<ArtifactMetadata> getMetadataList()
     {
         return real.getMetadataList();
     }
 
     public void setRepository( ArtifactRepository remoteRepository )
     {
         real.setRepository( remoteRepository );
     }
 
     public ArtifactRepository getRepository()
     {
         return real.getRepository();
     }
 
     public void updateVersion( String version, ArtifactRepository localRepository )
     {
         real.updateVersion( version, localRepository );
     }
 
     public String getDownloadUrl()
     {
         return real.getDownloadUrl();
     }
 
     public void setDownloadUrl( String downloadUrl )
     {
         real.setDownloadUrl( downloadUrl );
     }
 
     public ArtifactFilter getDependencyFilter()
     {
         return real.getDependencyFilter();
     }
 
     public void setDependencyFilter( ArtifactFilter artifactFilter )
     {
         real.setDependencyFilter( artifactFilter );
     }
 
     public ArtifactHandler getArtifactHandler()
     {
         return real.getArtifactHandler();
     }
 
     public List<String> getDependencyTrail()
     {
         return real.getDependencyTrail();
     }
 
     public void setDependencyTrail( List<String> dependencyTrail )
     {
         real.setDependencyTrail( dependencyTrail );
     }
 
     public void setScope( String scope )
     {
         real.setScope( scope );
     }
 
     public VersionRange getVersionRange()
     {
         return real.getVersionRange();
     }
 
     public void setVersionRange( VersionRange newRange )
     {
         real.setVersionRange( newRange );
     }
 
     public void selectVersion( String version )
     {
         real.selectVersion( version );
     }
 
     public void setGroupId( String groupId )
     {
         real.setGroupId( groupId );
     }
 
     public void setArtifactId( String artifactId )
     {
         real.setArtifactId( artifactId );
     }
 
     public boolean isSnapshot()
     {
         return real.isSnapshot();
     }
 
     public void setResolved( boolean resolved )
     {
         real.setResolved( resolved );
     }
 
     public boolean isResolved()
     {
         return real.isResolved();
     }
 
     public void setResolvedVersion( String version )
     {
         real.setResolvedVersion( version );
     }
 
     public void setArtifactHandler( ArtifactHandler handler )
     {
         real.setArtifactHandler( handler );
     }
 
     public boolean isRelease()
     {
         return real.isRelease();
     }
 
     public void setRelease( boolean release )
     {
         real.setRelease( release );
     }
 
     public List<ArtifactVersion> getAvailableVersions()
     {
         return real.getAvailableVersions();
     }
 
     public void setAvailableVersions( List<ArtifactVersion> versions )
     {
         real.setAvailableVersions( versions );
     }
 
     public boolean isOptional()
     {
         return real.isOptional();
     }
 
     public void setOptional( boolean optional )
     {
         real.setOptional( optional );
     }
 
     public ArtifactVersion getSelectedVersion()
         throws OverConstrainedVersionException
     {
         return real.getSelectedVersion();
     }
 
     public boolean isSelectedVersionKnown()
         throws OverConstrainedVersionException
     {
         return real.isSelectedVersionKnown();
     }
 
     public int compareTo( Artifact o )
     {
         return real.compareTo( o );
     }
 }