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BasicBlockingRecordQueue.java
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BasicBlockingRecordQueue.java
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/*
* Copyright 2019-2020 StreamThoughts.
*
* 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 io.streamthoughts.azkarra.api.events;
import io.streamthoughts.azkarra.api.events.callback.LimitQueueCallback;
import io.streamthoughts.azkarra.api.events.callback.LimitedQueueCallback;
import io.streamthoughts.azkarra.api.events.callback.QueueCallback;
import io.streamthoughts.azkarra.api.model.KV;
import java.time.Duration;
import java.util.Collection;
import java.util.Objects;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* A simple {@link BlockingRecordQueue} backed by a {@link BlockingQueue}.
*
* @param <K> the record-key type.
* @param <V> the record-value type.
*
* @since 0.8.0
*/
public class BasicBlockingRecordQueue<K, V> implements BlockingRecordQueue<K, V> {
static final int DEFAULT_QUEUE_SIZE_LIMIT = 10_000;
static final Duration DEFAULT_MAX_BLOCK_DURATION = Duration.ofMillis(100);
private final BlockingQueue<KV<K, V>> blockingQueue;
private final Duration maxBlockDuration;
private final AtomicBoolean isClosed = new AtomicBoolean(false);
private LimitQueueCallback callback;
/**
* Creates a new {@link BasicBlockingRecordQueue} instance.
*/
public BasicBlockingRecordQueue() {
this(DEFAULT_QUEUE_SIZE_LIMIT);
}
/**
* Creates a new {@link BasicBlockingRecordQueue} instance.
*
* @param queueSizeLimit the queue max capacity.
*/
public BasicBlockingRecordQueue(final int queueSizeLimit) {
this(queueSizeLimit, DEFAULT_MAX_BLOCK_DURATION);
}
/**
* Creates a new {@link BasicBlockingRecordQueue} instance.
*
* @param queueSizeLimit the queue max capacity.
* @param maxBlockDuration the maximum duration to wait to wait before giving up, when the queue is full.
*/
public BasicBlockingRecordQueue(final int queueSizeLimit, final Duration maxBlockDuration) {
this(queueSizeLimit, maxBlockDuration, LimitHandlers.NO_OP);
}
/**
* Creates a new {@link BasicBlockingRecordQueue} instance.
*
* @param queueSizeLimit the blocking size limit;
* @param maxBlockDuration the maximum duration to wait to wait before giving up, when the queue is full.
* @param limitHandler the {@link LimitHandler} to invoke after {@code maxBlockDuration} has been reached.
*/
public BasicBlockingRecordQueue(final int queueSizeLimit,
final Duration maxBlockDuration,
final LimitHandler limitHandler) {
if (queueSizeLimit <= 0)
throw new IllegalArgumentException("queueSizeLimit must be superior to 0, was :" + queueSizeLimit);
this.blockingQueue = new LinkedBlockingQueue<>(queueSizeLimit);
this.maxBlockDuration = maxBlockDuration;
this.callback = new LimitedQueueCallback(queueSizeLimit);
this.callback.setQueue(this);
this.callback.setLimitHandler(limitHandler);
}
/**
* {@inheritDoc}
*/
@Override
public void setLimitHandler(final LimitHandler limitHandler) {
Objects.requireNonNull(limitHandler, "limitHandler cannot be null");
this.callback.setLimitHandler(limitHandler);
}
/**
* {@inheritDoc}
*/
@Override
public void setQueueCallback(final QueueCallback callback) {
Objects.requireNonNull(callback, "callback cannot be null");
var parent = this.callback;
this.callback = new LimitQueueCallback() {
@Override
public void setLimitHandler(final LimitHandler limitHandler) {
parent.setLimitHandler(limitHandler);
}
@Override
public void setQueue(final BlockingRecordQueue queue) {
parent.setQueue(queue);
}
@Override
public void onQueued() {
callback.onQueued();
parent.onQueued();
}
@Override
public void onClosed() {
callback.onClosed();
parent.onClosed();
}
};
}
/**
* {@inheritDoc}
*/
@Override
public KV<K, V> poll(final Duration timeout) throws InterruptedException {
return blockingQueue.poll(timeout.toMillis(), TimeUnit.MILLISECONDS);
}
/**
* {@inheritDoc}
*/
@Override
public KV<K, V> poll() {
return blockingQueue.poll();
}
/**
* {@inheritDoc}
*/
@Override
public void drainTo(final Collection<? super KV<K, V>> collection) {
blockingQueue.drainTo(collection);
}
/**
* {@inheritDoc}
*/
@Override
public int size() {
return blockingQueue.size();
}
/**
* {@inheritDoc}
*/
@Override
public boolean isEmpty() {
return blockingQueue.isEmpty();
}
/**
* {@inheritDoc}
*/
@Override
public void open() {
isClosed.set(false);
}
/**
* {@inheritDoc}
*/
@Override
public void close() {
isClosed.set(true);
if (callback != null) callback.onClosed();
}
/**
* {@inheritDoc}
*/
@Override
public void send(final KV<K, V> record) {
if (record == null)
return;
try {
while (!isClosed.get()) {
if (blockingQueue.offer(record, maxBlockDuration.toMillis(), TimeUnit.MILLISECONDS)) {
if (callback != null) callback.onQueued();
break;
}
}
} catch (final InterruptedException ignore) {
Thread.currentThread().interrupt();
}
}
/**
* {@inheritDoc}
*/
@Override
public void clear() {
this.blockingQueue.clear();
}
}