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/*
* ===============================LICENSE_START======================================
* dcae-analytics
* ================================================================================
* Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* 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.
* ============================LICENSE_END===========================================
*/
package org.onap.dcae.apod.analytics.dmaap.service.publisher;
import com.google.inject.Inject;
import com.google.inject.assistedinject.Assisted;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.LinkedBlockingDeque;
import static com.google.common.collect.Iterables.concat;
import static com.google.common.collect.Lists.newLinkedList;
import static java.util.Collections.unmodifiableList;
/**
* <p>
* An implementation of {@link DMaaPMRPublisherQueue} which uses {@link java.util.concurrent.BlockingDeque}
* for batch and recovery queues
* </p>
*
*
* @author Rajiv Singla . Creation Date: 11/1/2016.
*/
public class DMaaPMRPublisherQueueImpl implements DMaaPMRPublisherQueue {
private static final Logger LOG = LoggerFactory.getLogger(DMaaPMRPublisherQueueImpl.class);
private final LinkedBlockingDeque<String> batchQueue;
private final LinkedBlockingDeque<String> recoveryQueue;
@Inject
public DMaaPMRPublisherQueueImpl(@Assisted("batchQueueSize") int batchQueueSize,
@Assisted("recoveryQueueSize") int recoveryQueueSize) {
batchQueue = new LinkedBlockingDeque<>(batchQueueSize);
recoveryQueue = new LinkedBlockingDeque<>(recoveryQueueSize);
LOG.debug("Creating Instance of DMaaP Publisher Queue. BatchQueueSize: {}, RecoveryQueueSize: {}",
batchQueueSize, recoveryQueueSize);
}
@Override
public synchronized int addBatchMessages(List<String> batchMessages) {
// checks if batchMessages size does not exceed batch queue capacity
if (batchMessages.size() > batchQueue.remainingCapacity()) {
throw new IllegalStateException("Not enough capacity to add batchMessages in batch queue");
}
// Add batchMessages to batch queue
for (String message : batchMessages) {
batchQueue.add(message);
}
// returns current elements size in batch queue
return batchQueue.size();
}
@Override
public synchronized int addRecoverableMessages(List<String> recoverableMessages) {
// checks if messages size does not exceed recovery queue size
if (recoverableMessages.size() > recoveryQueue.remainingCapacity()) {
throw new IllegalStateException("Not enough capacity to add messages in recovery queue");
}
// add messages to recovery queue
for (String recoverableMessage : recoverableMessages) {
recoveryQueue.add(recoverableMessage);
}
// returns current size of recovery queue
return recoveryQueue.size();
}
@Override
public synchronized List<String> getMessageForPublishing() {
final List<String> recoveryMessageList = new LinkedList<>();
final List<String> batchMessagesList = new LinkedList<>();
// get messages from recovery queue if present
if (!recoveryQueue.isEmpty()) {
final int recoveryQueueSize = recoveryQueue.drainTo(recoveryMessageList);
LOG.debug("Drained Recovery Queue elements for flushing: {}", recoveryQueueSize);
}
// get messages from batch queue if present
if (!batchQueue.isEmpty()) {
final int batchQueueSize = batchQueue.drainTo(batchMessagesList);
LOG.debug("Drained Batch Queue elements for flushing: {}", batchQueueSize);
}
// concat recovery and batch queue elements
return unmodifiableList(newLinkedList(concat(recoveryMessageList, batchMessagesList)));
}
@Override
public synchronized int getBatchQueueRemainingSize() {
return batchQueue.remainingCapacity();
}
@Override
public synchronized int getRecoveryQueueRemainingSize() {
return recoveryQueue.remainingCapacity();
}
}
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