| /* |
| * 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 |
| * 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. |
| */ |
| |
| package org.apache.iotdb.commons.pipe.datastructure.queue.listening; |
| |
| import org.apache.iotdb.commons.pipe.config.PipeConfig; |
| import org.apache.iotdb.commons.pipe.datastructure.queue.serializer.QueueSerializerType; |
| import org.apache.iotdb.commons.pipe.event.EnrichedEvent; |
| import org.apache.iotdb.commons.pipe.event.PipeSnapshotEvent; |
| import org.apache.iotdb.commons.pipe.task.PipeTask; |
| import org.apache.iotdb.pipe.api.event.Event; |
| |
| import org.apache.tsfile.utils.Pair; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * {@link AbstractPipeListeningQueue} is the encapsulation of the {@link |
| * AbstractSerializableListeningQueue} to enable using reference count to control opening and |
| * closing. This class also enables a {@link PipeTask} to find the snapshots close enough to send if |
| * existed. |
| */ |
| public abstract class AbstractPipeListeningQueue extends AbstractSerializableListeningQueue<Event> { |
| |
| private static final Logger LOGGER = LoggerFactory.getLogger(AbstractPipeListeningQueue.class); |
| |
| // The cache of the snapshot events list and the tail index of the queue |
| // when the snapshot events are generated. |
| // The snapshot path won't be taken snapshot itself and will be re-assigned when |
| // the node has been set up |
| private final Pair<Long, List<PipeSnapshotEvent>> queueTailIndex2SnapshotsCache = |
| new Pair<>(Long.MIN_VALUE, new ArrayList<>()); |
| |
| protected AbstractPipeListeningQueue() { |
| super(QueueSerializerType.PLAIN); |
| } |
| |
| /////////////////////////////// Plan /////////////////////////////// |
| |
| protected synchronized void tryListen(EnrichedEvent event) { |
| if (super.tryListen(event)) { |
| event.increaseReferenceCount(AbstractPipeListeningQueue.class.getName()); |
| } |
| } |
| |
| /////////////////////////////// Snapshot Cache /////////////////////////////// |
| |
| protected synchronized void tryListen(List<PipeSnapshotEvent> events) { |
| if (!isClosed.get()) { |
| clearSnapshots(); |
| queueTailIndex2SnapshotsCache.setLeft(queue.getTailIndex()); |
| events.forEach( |
| event -> event.increaseReferenceCount(AbstractPipeListeningQueue.class.getName())); |
| queueTailIndex2SnapshotsCache.setRight(events); |
| LOGGER.info( |
| "Pipe listening queue snapshot cache is updated: {}", queueTailIndex2SnapshotsCache); |
| } |
| } |
| |
| public synchronized Pair<Long, List<PipeSnapshotEvent>> findAvailableSnapshots() { |
| if (queueTailIndex2SnapshotsCache.getLeft() |
| < queue.getTailIndex() |
| - PipeConfig.getInstance().getPipeListeningQueueTransferSnapshotThreshold()) { |
| clearSnapshots(); |
| } |
| return queueTailIndex2SnapshotsCache; |
| } |
| |
| @Override |
| public synchronized long removeBefore(long newFirstIndex) { |
| final long result = super.removeBefore(newFirstIndex); |
| if (queueTailIndex2SnapshotsCache.getLeft() < result) { |
| clearSnapshots(); |
| } |
| return result; |
| } |
| |
| private synchronized void clearSnapshots() { |
| queueTailIndex2SnapshotsCache.setLeft(Long.MIN_VALUE); |
| queueTailIndex2SnapshotsCache |
| .getRight() |
| .forEach( |
| event -> |
| event.decreaseReferenceCount(AbstractPipeListeningQueue.class.getName(), false)); |
| queueTailIndex2SnapshotsCache.setRight(new ArrayList<>()); |
| } |
| |
| /////////////////////////////// Close /////////////////////////////// |
| |
| @Override |
| public synchronized void close() throws IOException { |
| clearSnapshots(); |
| super.close(); |
| } |
| |
| @Override |
| protected void releaseResource(Event event) { |
| if (event instanceof EnrichedEvent) { |
| ((EnrichedEvent) event) |
| .decreaseReferenceCount(AbstractPipeListeningQueue.class.getName(), false); |
| } |
| } |
| } |