Examples of eu.stratosphere.runtime.io.channels.Channel

Package eu.stratosphere.runtime.io.channels

Examples of eu.stratosphere.runtime.io.channels.Channel

eu.stratosphere.runtime.io.channels.Channel
The base class for channel objects.
Every channel has an index (at the corresponding gate), ID, and type. The connected channel is given by the ID of destination channel.

  public void unregister(ExecutionVertexID vertexId, Task task) {
    final Environment environment = task.getEnvironment();


    // destroy and remove OUTPUT channels from registered channels and cache
    for (ChannelID id : environment.getOutputChannelIDs()) {
      Channel channel = this.channels.remove(id);
      if (channel != null) {
        channel.destroy();
      }


      this.receiverCache.remove(channel);
    }


    // destroy and remove INPUT channels from registered channels and cache
    for (ChannelID id : environment.getInputChannelIDs()) {
      Channel channel = this.channels.remove(id);
      if (channel != null) {
        channel.destroy();
      }


      this.receiverCache.remove(channel);
    }

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      LOG.warn("Receiver cache already contained entry for " + source);
    }
  }


  private void generateSenderHint(Envelope envelope, RemoteReceiver receiver) throws IOException {
    Channel channel = this.channels.get(envelope.getSource());
    if (channel == null) {
      LOG.error("Cannot find channel for channel ID " + envelope.getSource());
      return;
    }


    // Only generate sender hints for output channels
    if (channel.isInputChannel()) {
      return;
    }


    final ChannelID targetChannelID = channel.getConnectedId();
    final int connectionIndex = receiver.getConnectionIndex();


    final RemoteReceiver ourAddress = new RemoteReceiver(this.ourAddress, connectionIndex);
    final Envelope senderHint = SenderHintEvent.createEnvelopeWithEvent(envelope, targetChannelID, ourAddress);

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    boolean success = false;
    
    try {
      if (receiverList.hasLocalReceiver()) {
        ChannelID receiver = receiverList.getLocalReceiver();
        Channel channel = this.channels.get(receiver);


        if (channel == null) {
          throw new LocalReceiverCancelledException(receiver);
        }


        if (!channel.isInputChannel()) {
          throw new IOException("Local receiver " + receiver + " is not an input channel.");
        }


        InputChannel<?> inputChannel = (InputChannel<?>) channel;

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    EnvelopeReceiverList receiverList = getReceiverListForEnvelope(envelope, true);


    if (receiverList.hasLocalReceiver()) {
      ChannelID receiver = receiverList.getLocalReceiver();
      Channel channel = this.channels.get(receiver);


      if (channel == null) {
        throw new LocalReceiverCancelledException(receiver);
      }


      if (channel.isInputChannel()) {
        throw new IOException("Local receiver " + receiver + " of backward event is not an output channel.");
      }


      OutputChannel outputChannel = (OutputChannel) channel;
      outputChannel.queueEnvelope(envelope);

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    if (!receiverList.hasLocalReceiver() || receiverList.hasRemoteReceiver()) {
      throw new IOException("Bug in network stack: Envelope dispatched from the incoming network pipe has no local receiver or has a remote receiver");
    }


    ChannelID localReceiver = receiverList.getLocalReceiver();
    Channel channel = this.channels.get(localReceiver);
    
    // if the channel is null, it means that receiver has been cleared already (cancelled or failed).
    // release the buffer immediately
    if (channel == null) {
      releaseEnvelope(envelope);
      if (LOG.isDebugEnabled()) {
        LOG.debug("Dropping envelope for cancelled receiver " + localReceiver);
      }
    }
    else {
      channel.queueEnvelope(envelope);
    }
  }

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      throw new IOException("The destination to be looked up is not a single local endpoint.");
    }
    


    ChannelID localReceiver = receiverList.getLocalReceiver();
    Channel channel = this.channels.get(localReceiver);
    
    if (channel == null) {
      // receiver is already canceled
      return this.discardBufferPool;
    }


    if (!channel.isInputChannel()) {
      throw new IOException("Channel context for local receiver " + localReceiver + " is not an input channel context");
    }


    return (InputChannel<?>) channel;
  }

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Related Classes of eu.stratosphere.runtime.io.channels.Channel

eu.stratosphere.runtime.io.network.ChannelManager

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