package org.apache.archiva.indexer.merger;
   /*
    * 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.archiva.common.plexusbridge.MavenIndexerUtils;
  import org.apache.archiva.common.plexusbridge.PlexusSisuBridge;
  import org.apache.archiva.common.plexusbridge.PlexusSisuBridgeException;
  import org.apache.commons.io.FileUtils;
  import org.apache.commons.lang.time.StopWatch;
  import org.apache.maven.index.NexusIndexer;
  import org.apache.maven.index.context.IndexingContext;
  import org.apache.maven.index.context.UnsupportedExistingLuceneIndexException;
  import org.apache.maven.index.packer.IndexPacker;
  import org.apache.maven.index.packer.IndexPackingRequest;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.scheduling.annotation.Async;
  import org.springframework.stereotype.Service;
  
  import javax.inject.Inject;
  import java.io.File;
  import java.io.IOException;
  import java.util.Collection;
  import java.util.List;
  import java.util.concurrent.CopyOnWriteArrayList;
  
  /**
   * @author Olivier Lamy
   * @since 1.4-M2
   */
  @Service("indexMerger#default")
  public class DefaultIndexMerger
      implements IndexMerger
  {
  
      private Logger log = LoggerFactory.getLogger( getClass() );
  
      private MavenIndexerUtils mavenIndexerUtils;
  
      private NexusIndexer indexer;
  
      private IndexPacker indexPacker;
  
      private List<TemporaryGroupIndex> temporaryGroupIndexes = new CopyOnWriteArrayList<>();
  
      private List<String> runningGroups = new CopyOnWriteArrayList<String>();
  
      @Inject
      public DefaultIndexMerger( PlexusSisuBridge plexusSisuBridge, MavenIndexerUtils mavenIndexerUtils )
          throws PlexusSisuBridgeException
      {
          this.indexer = plexusSisuBridge.lookup( NexusIndexer.class );
          this.mavenIndexerUtils = mavenIndexerUtils;
          indexPacker = plexusSisuBridge.lookup( IndexPacker.class, "default" );
      }
  
      @Override
      public IndexingContext buildMergedIndex( IndexMergerRequest indexMergerRequest )
          throws IndexMergerException
      {
          String groupId = indexMergerRequest.getGroupId();
  
          if ( runningGroups.contains( groupId ) )
          {
              log.info( "skip build merge remote indexes for id: '{}' as already running", groupId );
              return null;
          }
  
          runningGroups.add( groupId );
  
          StopWatch stopWatch = new StopWatch();
          stopWatch.reset();
          stopWatch.start();
  
          File mergedIndexDirectory = indexMergerRequest.getMergedIndexDirectory();
  
          String tempRepoId = mergedIndexDirectory.getName();
  
          try
          {
              File indexLocation = new File( mergedIndexDirectory, indexMergerRequest.getMergedIndexPath() );
              IndexingContext indexingContext =
                  indexer.addIndexingContext( tempRepoId, tempRepoId, mergedIndexDirectory, indexLocation, null, null,
                                             mavenIndexerUtils.getAllIndexCreators() );
 
             for ( String repoId : indexMergerRequest.getRepositoriesIds() )
             {
                 IndexingContext idxToMerge = indexer.getIndexingContexts().get( repoId );
                 if ( idxToMerge != null )
                 {
                     indexingContext.merge( idxToMerge.getIndexDirectory() );
                 }
             }
 
             indexingContext.optimize();
 
             if ( indexMergerRequest.isPackIndex() )
             {
                 IndexPackingRequest request = new IndexPackingRequest( indexingContext, indexLocation );
                 indexPacker.packIndex( request );
             }
 
             if ( indexMergerRequest.isTemporary() )
             {
                 temporaryGroupIndexes.add( new TemporaryGroupIndex( mergedIndexDirectory, tempRepoId, groupId,
                                                                     indexMergerRequest.getMergedIndexTtl() ) );
             }
             stopWatch.stop();
             log.info( "merged index for repos {} in {} s", indexMergerRequest.getRepositoriesIds(),
                       stopWatch.getTime() );
             return indexingContext;
         }
         catch ( IOException e )
         {
             throw new IndexMergerException( e.getMessage(), e );
         }
         catch ( UnsupportedExistingLuceneIndexException e )
         {
             throw new IndexMergerException( e.getMessage(), e );
         }
         finally
         {
             runningGroups.remove( groupId );
         }
     }
 
     @Async
     @Override
     public void cleanTemporaryGroupIndex( TemporaryGroupIndex temporaryGroupIndex )
     {
         if ( temporaryGroupIndex == null )
         {
             return;
         }
 
         try
         {
             IndexingContext indexingContext = indexer.getIndexingContexts().get( temporaryGroupIndex.getIndexId() );
             if ( indexingContext != null )
             {
                 indexer.removeIndexingContext( indexingContext, true );
             }
             File directory = temporaryGroupIndex.getDirectory();
             if ( directory != null && directory.exists() )
             {
                 FileUtils.deleteDirectory( directory );
             }
             temporaryGroupIndexes.remove( temporaryGroupIndex );
         }
         catch ( IOException e )
         {
             log.warn( "fail to delete temporary group index {}", temporaryGroupIndex.getIndexId(), e );
         }
     }
 
     @Override
     public Collection<TemporaryGroupIndex> getTemporaryGroupIndexes()
     {
         return this.temporaryGroupIndexes;
     }
 }