223 lines
4.6 KiB
Java
223 lines
4.6 KiB
Java
/*
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* Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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* implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package monasca.persister.consumer;
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import monasca.persister.pipeline.ManagedPipeline;
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import com.google.inject.Inject;
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import com.google.inject.assistedinject.Assisted;
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import org.apache.log4j.LogManager;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.TimeUnit;
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import kafka.consumer.ConsumerIterator;
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import monasca.persister.repository.RepoException;
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public class KafkaConsumerRunnableBasic<T> implements Runnable {
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private static final Logger logger = LoggerFactory.getLogger(KafkaConsumerRunnableBasic.class);
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private final KafkaChannel kafkaChannel;
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private final String threadId;
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private final ManagedPipeline<T> pipeline;
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private volatile boolean stop = false;
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private boolean fatalErrorDetected = false;
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private ExecutorService executorService;
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@Inject
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public KafkaConsumerRunnableBasic(
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@Assisted KafkaChannel kafkaChannel,
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@Assisted ManagedPipeline<T> pipeline,
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@Assisted String threadId) {
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this.kafkaChannel = kafkaChannel;
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this.pipeline = pipeline;
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this.threadId = threadId;
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}
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public KafkaConsumerRunnableBasic<T> setExecutorService(ExecutorService executorService) {
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this.executorService = executorService;
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return this;
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}
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protected void publishHeartbeat() throws RepoException {
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publishEvent(null);
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}
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private void markRead() {
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logger.debug("[{}]: marking read", this.threadId);
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this.kafkaChannel.markRead();
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}
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public void stop() {
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logger.info("[{}]: stop", this.threadId);
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this.stop = true;
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try {
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if (!this.fatalErrorDetected) {
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logger.info("[{}}: shutting pipeline down", this.threadId);
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if (pipeline.shutdown()) {
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markRead();
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}
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} else {
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logger.info("[{}]: fatal error detected. Exiting immediately without flush", this.threadId);
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}
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} catch (Exception e) {
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logger.error("caught fatal exception while shutting down", e);
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}
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}
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public void run() {
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logger.info("[{}]: run", this.threadId);
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final ConsumerIterator<byte[], byte[]> it = kafkaChannel.getKafkaStream().iterator();
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logger.debug("[{}]: KafkaChannel has stream iterator", this.threadId);
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while (!this.stop) {
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try {
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try {
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if (isInterrupted()) {
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this.fatalErrorDetected = true;
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break;
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}
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if (it.hasNext()) {
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if (isInterrupted()) {
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this.fatalErrorDetected = true;
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break;
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}
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final String msg = new String(it.next().message());
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logger.debug("[{}]: {}", this.threadId, msg);
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publishEvent(msg);
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}
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} catch (kafka.consumer.ConsumerTimeoutException cte) {
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if (isInterrupted()) {
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this.fatalErrorDetected = true;
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break;
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}
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publishHeartbeat();
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}
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} catch (Throwable e) {
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logger.error(
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"[{}]: caught fatal exception while publishing msg. Shutting entire persister down now!",
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this.threadId, e);
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this.stop = true;
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this.fatalErrorDetected = true;
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this.executorService.shutdownNow();
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try {
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this.executorService.awaitTermination(5, TimeUnit.SECONDS);
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} catch (InterruptedException e1) {
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logger.info("[{}]: interrupted while awaiting termination", this.threadId, e1);
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}
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LogManager.shutdown();
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System.exit(1);
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}
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}
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logger.info("[{}]: shutting down", this.threadId);
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this.kafkaChannel.stop();
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}
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protected void publishEvent(final String msg) throws RepoException {
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if (pipeline.publishEvent(msg)) {
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markRead();
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}
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}
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private boolean isInterrupted() {
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if (Thread.currentThread().interrupted()) {
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logger.debug("[{}]: is interrupted. breaking out of run loop", this.threadId);
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return true;
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} else {
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return false;
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}
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}
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}
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