package org.apache.maven.eventspy.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 java.util.ArrayList;
  import java.util.List;
  
  import org.apache.maven.eventspy.EventSpy;
  import org.apache.maven.execution.ExecutionListener;
  import org.codehaus.plexus.component.annotations.Component;
  import org.codehaus.plexus.component.annotations.Requirement;
  import org.codehaus.plexus.logging.Logger;
  import org.sonatype.aether.RepositoryListener;
  
  /**
   * Dispatches callbacks to all registered eventspies.
   */
  @Component( role = EventSpyDispatcher.class )
  public class EventSpyDispatcher
  {
  
      @Requirement
      private Logger logger;
  
      @Requirement( role = EventSpy.class )
      private List<EventSpy> eventSpies;
  
      public void setEventSpies( List<EventSpy> eventSpies )
      {
          // make copy to get rid of needless overhead for dynamic lookups
          this.eventSpies = new ArrayList<EventSpy>( eventSpies );
      }
  
      public List<EventSpy> getEventSpies()
      {
          return eventSpies;
      }
  
      public ExecutionListener chainListener( ExecutionListener listener )
      {
          if ( eventSpies.isEmpty() )
          {
              return listener;
          }
          return new EventSpyExecutionListener( this, listener );
      }
  
      public RepositoryListener chainListener( RepositoryListener listener )
      {
          if ( eventSpies.isEmpty() )
          {
              return listener;
          }
          return new EventSpyRepositoryListener( this, listener );
      }
  
      public void init( EventSpy.Context context )
      {
          if ( eventSpies.isEmpty() )
          {
              return;
          }
          for ( EventSpy eventSpy : eventSpies )
          {
              try
              {
                  eventSpy.init( context );
              }
              catch ( Exception e )
              {
                  logError( "initialize", e, eventSpy );
              }
              catch ( LinkageError e )
              {
                  logError( "initialize", e, eventSpy );
              }
          }
      }
  
      public void onEvent( Object event )
      {
          if ( eventSpies.isEmpty() )
         {
             return;
         }
         for ( EventSpy eventSpy : eventSpies )
         {
             try
             {
                 eventSpy.onEvent( event );
             }
             catch ( Exception e )
             {
                 logError( "notify", e, eventSpy );
             }
             catch ( LinkageError e )
             {
                 logError( "notify", e, eventSpy );
             }
         }
     }
 
     public void close()
     {
         if ( eventSpies.isEmpty() )
         {
             return;
         }
         for ( EventSpy eventSpy : eventSpies )
         {
             try
             {
                 eventSpy.close();
             }
             catch ( Exception e )
             {
                 logError( "close", e, eventSpy );
             }
             catch ( LinkageError e )
             {
                 logError( "close", e, eventSpy );
             }
         }
     }
 
     private void logError( String action, Throwable e, EventSpy spy )
     {
         String msg = "Failed to " + action + " spy " + spy.getClass().getName() + ": " + e.getMessage();
 
         if ( logger.isDebugEnabled() )
         {
             logger.warn( msg, e );
         }
         else
         {
             logger.warn( msg );
         }
     }
 
 }