package org.apache.maven.index;
   
   /*
    * 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 java.io.File;
  import java.io.IOException;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.apache.lucene.search.Query;
  import org.apache.maven.index.context.IndexingContext;
  import org.apache.maven.index.expr.UserInputSearchExpression;
  import org.junit.Test;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertNull;
  
  public class ConcurrentUseTest
      extends AbstractNexusIndexerTest
  {
      public static final int THREAD_COUNT = 10;
  
      protected File repo = new File( getBasedir(), "src/test/repo" );
  
      @Override
      protected void prepareNexusIndexer( NexusIndexer nexusIndexer )
          throws Exception
      {
          context =
              nexusIndexer.addIndexingContext( "test-default", "test", repo, indexDir, null, null, DEFAULT_CREATORS );
  
          assertNull( context.getTimestamp() ); // unknown upon creation
  
          nexusIndexer.scan( context );
  
          assertNotNull( context.getTimestamp() );
      }
  
      protected IndexUserThread createThread( final ArtifactInfo ai )
      {
          // we search and modify same context concurrently
          return new IndexUserThread( this, nexusIndexer, context, context, ai );
      }
  
      @Test
      public void testConcurrency()
          throws Exception
      {
          IndexUserThread[] threads = new IndexUserThread[THREAD_COUNT];
  
          ArtifactInfo ai =
              new ArtifactInfo( "test-default", "org.apache.maven.indexer", "index-concurrent-artifact", "", null, "jar" );
  
          for ( int i = 0; i < THREAD_COUNT; i++ )
          {
              threads[i] = createThread( ai );
  
              threads[i].start();
          }
  
          Thread.sleep( 5000 );
  
          boolean thereWereProblems = false;
  
          int totalAdded = 0;
  
          for ( int i = 0; i < THREAD_COUNT; i++ )
          {
              threads[i].stopThread();
  
              threads[i].join();
  
              thereWereProblems = thereWereProblems || threads[i].hadProblem();
  
              totalAdded += threads[i].getAdded();
          }
  
          assertFalse( "Not all thread did clean job!", thereWereProblems );
  
          context.commit();
  
         // sleep more than bottleWarmer does, to be sure commit and reopen happened
         // BottleWarmer sleeps 1000 millis
         Thread.sleep( 2000 );
 
         //
 
         Query q = nexusIndexer.constructQuery( MAVEN.GROUP_ID, new UserInputSearchExpression( ai.getGroupId() ) );
 
         FlatSearchResponse result = nexusIndexer.searchFlat( new FlatSearchRequest( q, context ) );
 
         assertEquals( "All added should be found after final commit!", totalAdded, result.getTotalHitsCount() );
     }
 
     // ==
 
     private static final AtomicInteger versionSource = new AtomicInteger( 1 );
 
     protected void addToIndex( final NexusIndexer nexusIndexer, final IndexingContext indexingContext )
         throws IOException
     {
         final ArtifactInfo artifactInfo =
             new ArtifactInfo( "test-default", "org.apache.maven.indexer", "index-concurrent-artifact", "1."
                 + versionSource.getAndIncrement(), null , "jar");
 
         final ArtifactContext ac = new ArtifactContext( null, null, null, artifactInfo, artifactInfo.calculateGav() );
 
         nexusIndexer.addArtifactToIndex( ac, indexingContext );
     }
 
     protected void deleteFromIndex( final NexusIndexer nexusIndexer, final IndexingContext indexingContext )
         throws IOException
     {
         // TODO: delete some of those already added
         // artifactInfo.version = "1." + String.valueOf( versionSource.getAndIncrement() );
         //
         // ac = new ArtifactContext( null, null, null, artifactInfo, artifactInfo.calculateGav() );
         //
         // nexusIndexer.deleteArtifactFromIndex( ac, indexingContext );
         //
         // deleted++;
     }
 
     protected int readIndex( final NexusIndexer nexusIndexer, final IndexingContext indexingContext )
         throws IOException
     {
         final Query q =
             nexusIndexer.constructQuery( MAVEN.GROUP_ID, new UserInputSearchExpression( "org.apache.maven.indexer" ) );
 
         FlatSearchResponse result = nexusIndexer.searchFlat( new FlatSearchRequest( q, indexingContext ) );
 
         return result.getReturnedHitsCount();
     }
 
     // ==
 
     public static class IndexUserThread
         extends Thread
     {
         private final ConcurrentUseTest test;
 
         private final NexusIndexer nexusIndexer;
 
         private final IndexingContext searchIndexingContext;
 
         private final IndexingContext modifyIndexingContext;
 
         private boolean stopped = false;
 
         private int added = 0;
 
         private int deleted = 0;
 
         private int lastSearchHitCount = 0;
 
         private Throwable t;
 
         public IndexUserThread( final ConcurrentUseTest test, final NexusIndexer nexusIndexer,
                                 final IndexingContext searchIndexingContext,
                                 final IndexingContext modifyIndexingContext, ArtifactInfo artifactInfo )
         {
             this.test = test;
 
             this.nexusIndexer = nexusIndexer;
 
             this.searchIndexingContext = searchIndexingContext;
 
             this.modifyIndexingContext = modifyIndexingContext;
         }
 
         public int getAdded()
         {
             return added;
         }
 
         public int getDeleted()
         {
             return deleted;
         }
 
         public boolean hadProblem()
         {
             return t != null;
         }
 
         public int getLastSearchHitCount()
         {
             return lastSearchHitCount;
         }
 
         public void stopThread()
             throws IOException
         {
             this.modifyIndexingContext.commit();
 
             this.stopped = true;
         }
 
         public void run()
         {
             while ( !stopped )
             {
                 if ( System.currentTimeMillis() % 5 == 0 )
                 {
                     try
                     {
                         test.addToIndex( nexusIndexer, modifyIndexingContext );
 
                         added++;
                     }
                     catch ( Throwable e )
                     {
                         t = e;
 
                         e.printStackTrace();
 
                         throw new IllegalStateException( "error", e );
                     }
                 }
 
                 if ( System.currentTimeMillis() % 11 == 0 )
                 {
                     try
                     {
                         // test.deleteFromIndex( nexusIndexer, modifyIndexingContext );
                         // deleted++;
                     }
                     catch ( Throwable e )
                     {
                         t = e;
 
                         throw new IllegalStateException( "error", e );
                     }
                 }
 
                 try
                 {
                     lastSearchHitCount = test.readIndex( nexusIndexer, searchIndexingContext );
                 }
                 catch ( Throwable e )
                 {
                     t = e;
 
                     throw new IllegalStateException( "error", e );
                 }
             }
         }
     }
 }