Examples with InputOperatorImpl org.apache.samza.operators.impl.InputOperatorImpl used on opensource projects

Example 1 with InputOperatorImpl

use of org.apache.samza.operators.impl.InputOperatorImpl in project samza by apache.

the class StreamOperatorTask method processAsync.

/**
 * Passes the incoming message envelopes along to the {@link InputOperatorImpl} node
 * for the input {@link SystemStream}. It is non-blocking and dispatches the message to the container thread
 * pool. The thread pool size is configured through job.container.thread.pool.size. In the absence of the config,
 * the task executes the DAG on the run loop thread.
 * <p>
 * From then on, each {@link org.apache.samza.operators.impl.OperatorImpl} propagates its transformed output to
 * its chained {@link org.apache.samza.operators.impl.OperatorImpl}s itself.
 *
 * @param ime incoming message envelope to process
 * @param collector the collector to send messages with
 * @param coordinator the coordinator to request commits or shutdown
 * @param callback the task callback handle
 */
@Override
public final void processAsync(IncomingMessageEnvelope ime, MessageCollector collector, TaskCoordinator coordinator, TaskCallback callback) {
    Runnable processRunnable = () -> {
        try {
            SystemStream systemStream = ime.getSystemStreamPartition().getSystemStream();
            InputOperatorImpl inputOpImpl = operatorImplGraph.getInputOperator(systemStream);
            if (inputOpImpl != null) {
                CompletionStage<Void> processFuture;
                MessageType messageType = MessageType.of(ime.getMessage());
                switch(messageType) {
                    case USER_MESSAGE:
                        processFuture = inputOpImpl.onMessageAsync(ime, collector, coordinator);
                        break;
                    case END_OF_STREAM:
                        EndOfStreamMessage eosMessage = (EndOfStreamMessage) ime.getMessage();
                        processFuture = inputOpImpl.aggregateEndOfStream(eosMessage, ime.getSystemStreamPartition(), collector, coordinator);
                        break;
                    case WATERMARK:
                        WatermarkMessage watermarkMessage = (WatermarkMessage) ime.getMessage();
                        processFuture = inputOpImpl.aggregateWatermark(watermarkMessage, ime.getSystemStreamPartition(), collector, coordinator);
                        break;
                    default:
                        processFuture = failedFuture(new SamzaException("Unknown message type " + messageType + " encountered."));
                        break;
                }
                processFuture.whenComplete((val, ex) -> {
                    if (ex != null) {
                        callback.failure(ex);
                    } else {
                        callback.complete();
                    }
                });
            } else {
                // If InputOperator is not found in the operator graph for a given SystemStream, throw an exception else the
                // job will timeout due to async task callback timeout (TaskCallbackTimeoutException)
                final String errMessage = String.format("InputOperator not found in OperatorGraph for %s. The available input" + " operators are: %s. Please check SystemStream configuration for the `SystemConsumer` and/or task.inputs" + " task configuration.", systemStream, operatorImplGraph.getAllInputOperators());
                LOG.error(errMessage);
                callback.failure(new SamzaException(errMessage));
            }
        } catch (Exception e) {
            LOG.error("Failed to process the incoming message due to ", e);
            callback.failure(e);
        }
    };
    if (taskThreadPool != null) {
        LOG.debug("Processing message using thread pool.");
        taskThreadPool.submit(processRunnable);
    } else {
        LOG.debug("Processing message on the run loop thread.");
        processRunnable.run();
    }
}