/*
* 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
*
* 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.
*/
package org.apache.streams.local.tasks;
import org.apache.streams.config.StreamsConfiguration;
import org.apache.streams.core.DatumStatus;
import org.apache.streams.core.DatumStatusCountable;
import org.apache.streams.core.DatumStatusCounter;
import org.apache.streams.core.StreamsDatum;
import org.apache.streams.core.StreamsProcessor;
import org.apache.streams.core.util.DatumUtils;
import org.apache.streams.local.counters.StreamsTaskCounter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.LinkedList;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
/**
*
*/
public class StreamsProcessorTask extends BaseStreamsTask implements DatumStatusCountable {
private final static Logger LOGGER = LoggerFactory.getLogger(StreamsProcessorTask.class);
private StreamsProcessor processor;
private AtomicBoolean keepRunning;
private StreamsConfiguration streamConfig;
private BlockingQueue<StreamsDatum> inQueue;
private AtomicBoolean isRunning;
private AtomicBoolean blocked;
private StreamsTaskCounter counter;
private DatumStatusCounter statusCounter = new DatumStatusCounter();
@Override
public DatumStatusCounter getDatumStatusCounter() {
return this.statusCounter;
}
/**
* Default constructor, uses default sleep time of 500ms when inbound queue is empty
* @param processor process to run in task
*/
public StreamsProcessorTask(StreamsProcessor processor) {
this(processor, new StreamsConfiguration());
}
/**
* @param processor
* @param streamConfig
*/
public StreamsProcessorTask(StreamsProcessor processor, StreamsConfiguration streamConfig) {
super(streamConfig);
this.streamConfig = super.streamConfig;
this.processor = processor;
this.keepRunning = new AtomicBoolean(true);
this.isRunning = new AtomicBoolean(true);
this.blocked = new AtomicBoolean(true);
}
@Override
public boolean isWaiting() {
return this.inQueue.isEmpty() && this.blocked.get();
}
@Override
public void stopTask() {
this.keepRunning.set(false);
}
@Override
public void setStreamConfig(StreamsConfiguration config) {
this.streamConfig = config;
}
@Override
public void addInputQueue(BlockingQueue<StreamsDatum> inputQueue) {
this.inQueue = inputQueue;
}
@Override
public boolean isRunning() {
return this.isRunning.get();
}
@Override
public void run() {
try {
this.processor.prepare(this.streamConfig);
if(this.counter == null) {
this.counter = new StreamsTaskCounter(this.processor.getClass().getName()+ UUID.randomUUID().toString(), getStreamIdentifier(), getStartedAt());
}
while(this.keepRunning.get()) {
StreamsDatum datum = null;
try {
this.blocked.set(true);
datum = this.inQueue.poll(streamConfig.getBatchFrequencyMs(), TimeUnit.MILLISECONDS);
} catch (InterruptedException ie) {
LOGGER.debug("Received InteruptedException, shutting down and re-applying interrupt status.");
this.keepRunning.set(false);
if(!this.inQueue.isEmpty()) {
LOGGER.error("Received InteruptedException and input queue still has data, count={}, processor={}",this.inQueue.size(), this.processor.getClass().getName());
}
Thread.currentThread().interrupt();
} finally {
this.blocked.set(false);
}
if(datum != null) {
this.counter.incrementReceivedCount();
try {
long startTime = System.currentTimeMillis();
List<StreamsDatum> output = this.processor.process(datum);
this.counter.addTime(System.currentTimeMillis() - startTime);
if(output != null) {
for(StreamsDatum outDatum : output) {
super.addToOutgoingQueue(outDatum);
this.counter.incrementEmittedCount();
statusCounter.incrementStatus(DatumStatus.SUCCESS);
}
}
} catch (InterruptedException ie) {
LOGGER.warn("Received InterruptedException, shutting down and re-applying interrupt status.");
this.keepRunning.set(false);
Thread.currentThread().interrupt();
} catch (Throwable t) {
this.counter.incrementErrorCount();
LOGGER.warn("Caught Throwable in processor, {} : {}", this.processor.getClass().getName(), t);
statusCounter.incrementStatus(DatumStatus.FAIL);
//Add the error to the metadata, but keep processing
DatumUtils.addErrorToMetadata(datum, t, this.processor.getClass());
}
} else {
LOGGER.trace("Removed NULL datum from queue at processor : {}", this.processor.getClass().getName());
}
}
} catch(Throwable e) {
LOGGER.error("Caught Throwable in Processor {}", this.processor.getClass().getSimpleName(), e);
} finally {
this.isRunning.set(false);
this.processor.cleanUp();
}
}
@Override
public List<BlockingQueue<StreamsDatum>> getInputQueues() {
List<BlockingQueue<StreamsDatum>> queues = new LinkedList<BlockingQueue<StreamsDatum>>();
queues.add(this.inQueue);
return queues;
}
@Override
public void setStreamsTaskCounter(StreamsTaskCounter counter) {
this.counter = counter;
}
}