org.apache.kafka.streams.processor.internals.PunctuationQueue Maven / Gradle / Ivy
/*
* 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.kafka.streams.processor.internals;
import org.apache.kafka.streams.errors.TaskMigratedException;
import org.apache.kafka.streams.processor.Cancellable;
import org.apache.kafka.streams.processor.PunctuationType;
import java.util.PriorityQueue;
public class PunctuationQueue {
private final PriorityQueue pq = new PriorityQueue<>();
public Cancellable schedule(final PunctuationSchedule sched) {
synchronized (pq) {
pq.add(sched);
}
return sched.cancellable();
}
public void close() {
synchronized (pq) {
pq.clear();
}
}
/**
* @throws TaskMigratedException if the task producer got fenced (EOS only)
*/
boolean maybePunctuate(final long timestamp, final PunctuationType type, final ProcessorNodePunctuator processorNodePunctuator) {
synchronized (pq) {
boolean punctuated = false;
PunctuationSchedule top = pq.peek();
while (top != null && top.timestamp <= timestamp) {
final PunctuationSchedule sched = top;
pq.poll();
if (!sched.isCancelled()) {
processorNodePunctuator.punctuate(sched.node(), timestamp, type, sched.punctuator());
// sched can be cancelled from within the punctuator
if (!sched.isCancelled()) {
pq.add(sched.next(timestamp));
}
punctuated = true;
}
top = pq.peek();
}
return punctuated;
}
}
/**
* Returns true if there is a schedule ready to be punctuated.
*/
boolean canPunctuate(final long timestamp) {
synchronized (pq) {
PunctuationSchedule top = pq.peek();
while (top != null && top.timestamp <= timestamp) {
if (!top.isCancelled()) {
return true;
}
// Side-effect: removes cancelled schedules (not externally visible)
pq.poll();
top = pq.peek();
}
return false;
}
}
}