FileDocCategorySizeDatePackage
ReadController.javaAPI DocAzureus 3.0.3.411175Thu May 31 16:29:00 BST 2007com.aelitis.azureus.core.networkmanager.impl

ReadController

public class ReadController extends Object implements com.aelitis.azureus.core.stats.AzureusCoreStatsProvider
Processes reads of read-entities and handles the read selector.

Fields Summary
private static int
IDLE_SLEEP_TIME
private static boolean
AGGRESIVE_READ
private volatile ArrayList
normal_priority_entities
private volatile ArrayList
high_priority_entities
private final AEMonitor
entities_mon
private int
next_normal_position
private int
next_high_position
private long
loop_count
private long
wait_count
private long
non_progress_count
private long
progress_count
private long
entity_check_count
private long
last_entity_check_count
private com.aelitis.azureus.core.networkmanager.EventWaiter
read_waiter
Constructors Summary
public ReadController()


  
    
     
    //start read handler processing
    Thread read_processor_thread = new AEThread( "ReadController:ReadProcessor" ) {
      public void runSupport() {
        readProcessorLoop();
      }
    };
    read_processor_thread.setDaemon( true );
    read_processor_thread.setPriority( Thread.MAX_PRIORITY - 1 );
    read_processor_thread.start();
    
    Set	types = new HashSet();
    
    types.add( AzureusCoreStats.ST_NET_READ_CONTROL_LOOP_COUNT );
    types.add( AzureusCoreStats.ST_NET_READ_CONTROL_NP_COUNT );
    types.add( AzureusCoreStats.ST_NET_READ_CONTROL_P_COUNT );
    types.add( AzureusCoreStats.ST_NET_READ_CONTROL_WAIT_COUNT );
    types.add( AzureusCoreStats.ST_NET_READ_CONTROL_ENTITY_COUNT );
    types.add( AzureusCoreStats.ST_NET_READ_CONTROL_CON_COUNT );
    types.add( AzureusCoreStats.ST_NET_READ_CONTROL_READY_CON_COUNT );
    
    AzureusCoreStats.registerProvider(
    	types,
    	this );
    
    AEDiagnostics.addEvidenceGenerator(
    	new AEDiagnosticsEvidenceGenerator()
    	{
    		public void 
    		generate(
    			IndentWriter writer ) 
    		{
				writer.println( "Read Controller" );
					
				try{
					writer.indent();
					
					ArrayList ref = normal_priority_entities;

					writer.println( "normal - " + ref.size());
					    
					for (int i=0;i<ref.size();i++){
						
						RateControlledEntity entity = (RateControlledEntity)ref.get( i );

						writer.println( entity.getString());
					}

					ref = high_priority_entities;

					writer.println( "priority - " + ref.size());
					    
					for (int i=0;i<ref.size();i++){
						
						RateControlledEntity entity = (RateControlledEntity)ref.get( i );

						writer.println( entity.getString());
					}
				}finally{
					
					writer.exdent();
				}
    		}
    	});
Methods Summary
public voidaddReadEntity(RateControlledEntity entity)
Add the given entity to the controller for read processing.

param
entity to process reads for

    try {  entities_mon.enter();
      if( entity.getPriority() == RateControlledEntity.PRIORITY_HIGH ) {
        //copy-on-write
        ArrayList high_new = new ArrayList( high_priority_entities.size() + 1 );
        high_new.addAll( high_priority_entities );
        high_new.add( entity );
        high_priority_entities = high_new;
      }
      else {
        //copy-on-write
        ArrayList norm_new = new ArrayList( normal_priority_entities.size() + 1 );
        norm_new.addAll( normal_priority_entities );
        norm_new.add( entity );
        normal_priority_entities = norm_new;
      }
    }
    finally {  entities_mon.exit();  }
private booleandoHighPriorityRead()

	  return( doRead( getNextReadyHighPriorityEntity()));
private booleandoNormalPriorityRead()

	  return( doRead( getNextReadyNormalPriorityEntity()));
private booleandoRead(RateControlledEntity ready_entity)

  
	  if ( ready_entity != null ){
		 
		  if ( AGGRESIVE_READ ){
			  
			  	// skip over failed readers to find a good one
			  
			  if ( ready_entity.doProcessing( read_waiter ) ) {
	
				  progress_count++;
	
				  return( true );
	
			  }else{
				  
				  non_progress_count++;
	
				  if ( entity_check_count - last_entity_check_count >= normal_priority_entities.size() + high_priority_entities.size() ){
	
					  last_entity_check_count	= entity_check_count;
					  
					  	// force a wait
					  
					  if ( read_waiter.waitForEvent( IDLE_SLEEP_TIME )){
		            		wait_count++;
					  }
					  
					  return( false);
				  }
	
				  return( true );
			  }
		  }else{
			  
			  return( ready_entity.doProcessing( read_waiter ));
		  }
	  }
	  
	  return false;
private RateControlledEntitygetNextReadyHighPriorityEntity()

    ArrayList ref = high_priority_entities;
    
    int size = ref.size();
    int num_checked = 0;

    while( num_checked < size ) {
      entity_check_count++;
      next_high_position = next_high_position >= size ? 0 : next_high_position;  //make circular
      RateControlledEntity entity = (RateControlledEntity)ref.get( next_high_position );
      next_high_position++;
      num_checked++;
      if( entity.canProcess( read_waiter ) ) {  //is ready
        return entity;
      }
    }

    return null;  //none found ready
private RateControlledEntitygetNextReadyNormalPriorityEntity()

    ArrayList ref = normal_priority_entities;
    
    int size = ref.size();
    int num_checked = 0;

    while( num_checked < size ) {
      entity_check_count++;
      next_normal_position = next_normal_position >= size ? 0 : next_normal_position;  //make circular
      RateControlledEntity entity = (RateControlledEntity)ref.get( next_normal_position );
      next_normal_position++;
      num_checked++;
      if( entity.canProcess( read_waiter ) ) {  //is ready
        return entity;
      }
    }

    return null;  //none found ready
private voidreadProcessorLoop()

    boolean check_high_first = true;
    
    while( true ) {
      loop_count++;
      try {
        if( check_high_first ) {
          check_high_first = false;
          if( !doHighPriorityRead() ) {
            if( !doNormalPriorityRead() ) {
            	if ( read_waiter.waitForEvent( IDLE_SLEEP_TIME )){
            		wait_count++;
            	}
            }
          }
        }
        else {
          check_high_first = true;
          if( !doNormalPriorityRead() ) {
            if( !doHighPriorityRead() ) {
            	if ( read_waiter.waitForEvent( IDLE_SLEEP_TIME )){
            		wait_count++;
            	}
            }
          }
        }
      }
      catch( Throwable t ) {
        Debug.out( "readProcessorLoop() EXCEPTION: ", t );
      }
    }
public voidremoveReadEntity(RateControlledEntity entity)
Remove the given entity from the controller.

param
entity to remove from read processing

    try {  entities_mon.enter();
      if( entity.getPriority() == RateControlledEntity.PRIORITY_HIGH ) {
        //copy-on-write
        ArrayList high_new = new ArrayList( high_priority_entities );
        high_new.remove( entity );
        high_priority_entities = high_new;
      }
      else {
        //copy-on-write
        ArrayList norm_new = new ArrayList( normal_priority_entities );
        norm_new.remove( entity );
        normal_priority_entities = norm_new;
      }
    }
    finally {  entities_mon.exit();  }
public voidupdateStats(java.util.Set types, java.util.Map values)

	  if ( types.contains( AzureusCoreStats.ST_NET_READ_CONTROL_LOOP_COUNT )){

		  values.put( AzureusCoreStats.ST_NET_READ_CONTROL_LOOP_COUNT, new Long( loop_count  ));
	  }
	  
	  if ( types.contains( AzureusCoreStats.ST_NET_READ_CONTROL_NP_COUNT )){

		  values.put( AzureusCoreStats.ST_NET_READ_CONTROL_NP_COUNT, new Long( non_progress_count  ));
	  }
	  
	  if ( types.contains( AzureusCoreStats.ST_NET_READ_CONTROL_P_COUNT )){

		  values.put( AzureusCoreStats.ST_NET_READ_CONTROL_P_COUNT, new Long( progress_count  ));
	  }
	  
	  if ( types.contains( AzureusCoreStats.ST_NET_READ_CONTROL_WAIT_COUNT )){

		  values.put( AzureusCoreStats.ST_NET_READ_CONTROL_WAIT_COUNT, new Long( wait_count  ));
	  }
	  
	  if ( types.contains( AzureusCoreStats.ST_NET_READ_CONTROL_ENTITY_COUNT )){

		  values.put( AzureusCoreStats.ST_NET_READ_CONTROL_ENTITY_COUNT, new Long( high_priority_entities.size() + normal_priority_entities.size()));
	  }
	 
	  if ( 	types.contains( AzureusCoreStats.ST_NET_READ_CONTROL_CON_COUNT ) ||
			types.contains( AzureusCoreStats.ST_NET_READ_CONTROL_READY_CON_COUNT )){
		   		    
		  int	ready_connections	= 0;
		  int	connections			= 0;
		  
		  ArrayList[] refs = { normal_priority_entities, high_priority_entities };
		    
		  for (int i=0;i<refs.length;i++){
			  
			  ArrayList	ref = refs[i];
			 
			  for (int j=0;j<ref.size();j++){
		  
			      RateControlledEntity entity = (RateControlledEntity)ref.get( j );
			      
			      connections 		+= entity.getConnectionCount();
			      
			      ready_connections += entity.getReadyConnectionCount( read_waiter );
			  }
		  }
		  
		  values.put( AzureusCoreStats.ST_NET_READ_CONTROL_CON_COUNT, new Long( connections ));
		  values.put( AzureusCoreStats.ST_NET_READ_CONTROL_READY_CON_COUNT, new Long( ready_connections ));
	  }