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.project.MavenProject;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  /**
   * Handles all concurrency-related logging.
   * <p/>
   * The logging/diagnostic needs of a concurrent build are different from a linear build. This
   * delta required to analyze a concurrent build is located here.
   * <p/>
   * NOTE: This class is not part of any public api and can be changed or deleted without prior notice.
   * 
   * @since 3.0
   * @author Kristian Rosenvold
   */
  public class ConcurrentBuildLogger
  {
      private final long startTime;
  
      private final Map<MavenProject, Thread> threadMap = new ConcurrentHashMap<MavenProject, Thread>();
  
      public ConcurrentBuildLogger()
      {
          startTime = System.currentTimeMillis();
      }
  
  
      List<BuildLogItem> items = Collections.synchronizedList( new ArrayList<BuildLogItem>() );
  
      public BuildLogItem createBuildLogItem( MavenProject project, ExecutionPlanItem current )
      {
          threadMap.put( project, Thread.currentThread() );
          BuildLogItem result = new BuildLogItem( project, current );
          items.add( result );
          return result;
      }
  
      public String toString()
      {
          StringBuilder result = new StringBuilder();
          for ( Map.Entry<MavenProject, Thread> mavenProjectThreadEntry : threadMap.entrySet() )
          {
              result.append( mavenProjectThreadEntry.getKey().getName() );
              result.append( " ran on " );
              result.append( mavenProjectThreadEntry.getValue().getName() );
              result.append( "\n" );
          }
  
          for ( BuildLogItem builtLogItem : items )
          {
              result.append( builtLogItem.toString( startTime ) );
              result.append( "\n" );
          }
          return result.toString();
      }
  
      public String toGraph()
      {
          StringBuilder result = new StringBuilder();
  
          Map<MavenProject, Collection<BuildLogItem>> multiMap = new HashMap<MavenProject, Collection<BuildLogItem>>();
          for ( BuildLogItem builtLogItem : items )
          {
              MavenProject project = builtLogItem.getProject();
              Collection<BuildLogItem> bag = multiMap.get( project );
              if ( bag == null )
              {
                  bag = new ArrayList<BuildLogItem>();
                  multiMap.put( project, bag );
              }
              bag.add( builtLogItem );
          }
 
         result.append( "digraph build" );
         result.append( " {\n " );
 
         for ( MavenProject mavenProject : multiMap.keySet() )
         {
             final Collection<BuildLogItem> builtLogItems = multiMap.get( mavenProject );
             result.append( "   subgraph " );
             result.append( mavenProject.getArtifactId() );
             result.append( "   {\n" );
 
             for ( BuildLogItem builtLogItem : builtLogItems )
             {
                 result.append( builtLogItem.toGraph( startTime ) );
             }
 
             result.append( "\n   }\n" );
         }
 
         result.append( "\n}\n " );
         return result.toString();
     }
 
 }