Package appeng.me.cache

Source Code of appeng.me.cache.NetworkMonitor

package appeng.me.cache;

import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Map.Entry;

import appeng.api.networking.events.MENetworkStorageEvent;
import appeng.api.networking.security.BaseActionSource;
import appeng.api.storage.IMEInventoryHandler;
import appeng.api.storage.IMEMonitorHandlerReceiver;
import appeng.api.storage.MEMonitorHandler;
import appeng.api.storage.StorageChannel;
import appeng.api.storage.data.IAEStack;
import appeng.api.storage.data.IItemList;
import appeng.me.storage.ItemWatcher;

public class NetworkMonitor<T extends IAEStack<T>> extends MEMonitorHandler<T>
{

  final private GridStorageCache myGridCache;
  final private StorageChannel myChannel;

  boolean sendEvent = false;

  public void forceUpdate()
  {
    hasChanged = true;

    Iterator<Entry<IMEMonitorHandlerReceiver<T>, Object>> i = getListeners();
    while (i.hasNext())
    {
      Entry<IMEMonitorHandlerReceiver<T>, Object> o = i.next();
      IMEMonitorHandlerReceiver<T> receiver = o.getKey();

      if ( receiver.isValid( o.getValue() ) )
        receiver.onListUpdate();
      else
        i.remove();
    }
  }

  public NetworkMonitor(GridStorageCache cache, StorageChannel chan) {
    super( null, chan );
    myGridCache = cache;
    myChannel = chan;
  }

  final static public LinkedList depth = new LinkedList();
 
  @Override
  protected void postChangesToListeners(Iterable<T> changes, BaseActionSource src)
  {
    postChange( true, changes, src );
  }
 
  protected void postChange(boolean Add, Iterable<T> changes, BaseActionSource src)
  {
    if ( depth.contains( this ) )
      return;

    depth.push( this );

    sendEvent = true;
    notifyListenersOfChange( changes, src );

    IItemList<T> myStorageList = getStorageList();

    for (T changedItem : changes)
    {
      T difference = changedItem;

      if ( !Add && changedItem != null )
        (difference = changedItem.copy()).setStackSize( -changedItem.getStackSize() );

      if ( myGridCache.interestManager.containsKey( changedItem ) )
      {
        Collection<ItemWatcher> list = myGridCache.interestManager.get( changedItem );
        if ( !list.isEmpty() )
        {
          IAEStack fullStack = myStorageList.findPrecise( changedItem );
          if ( fullStack == null )
          {
            fullStack = changedItem.copy();
            fullStack.setStackSize( 0 );
          }

          myGridCache.interestManager.enableTransactions();

          for (ItemWatcher iw : list)
            iw.getHost().onStackChange( myStorageList, fullStack, difference, src, getChannel() );

          myGridCache.interestManager.disableTransactions();
        }
      }
    }

    Object last = depth.pop();
    if ( last != this )
      throw new RuntimeException( "Invalid Access to Networked Storage API detected." );
  }

  public void onTick()
  {
    if ( sendEvent )
    {
      sendEvent = false;
      myGridCache.myGrid.postEvent( new MENetworkStorageEvent( this, myChannel ) );
    }
  }

  @Override
  protected IMEInventoryHandler getHandler()
  {
    switch (myChannel)
    {
    case ITEMS:
      return myGridCache.getItemInventoryHandler();
    case FLUIDS:
      return myGridCache.getFluidInventoryHandler();
    default:
    }
    return null;
  }

}
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