| /* |
| * 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 accord.impl.basic; |
| |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.Delayed; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.ScheduledFuture; |
| import java.util.concurrent.TimeUnit; |
| |
| import accord.api.Agent; |
| import accord.burn.random.FrequentLargeRange; |
| import accord.burn.random.RandomLong; |
| import accord.burn.random.RandomWalkRange; |
| import accord.utils.RandomSource; |
| |
| import static java.util.concurrent.TimeUnit.NANOSECONDS; |
| |
| public class SimulatedDelayedExecutorService extends TaskExecutorService implements ScheduledExecutorService |
| { |
| private class ScheduledTask<T> extends Task<T> implements ScheduledFuture<T> |
| { |
| private final long sequenceNumber; |
| private final long periodMillis; |
| private long nextExecuteAtMillis; |
| private boolean canceled = false; |
| |
| private ScheduledTask(long sequenceNumber, long initialDelay, long value, TimeUnit unit, Callable<T> fn) |
| { |
| super(fn); |
| this.sequenceNumber = sequenceNumber; |
| periodMillis = unit.toMillis(value); |
| nextExecuteAtMillis = triggerTime(initialDelay, unit); |
| } |
| |
| private long triggerTime(long delay, TimeUnit unit) |
| { |
| long delayMillis = unit.toMillis(delay < 0 ? 0 : delay); |
| return pending.nowInMillis() + delayMillis; |
| } |
| |
| @Override |
| public long getDelay(TimeUnit unit) |
| { |
| return unit.convert(nextExecuteAtMillis - pending.nowInMillis(), TimeUnit.MILLISECONDS); |
| } |
| |
| @Override |
| public int compareTo(Delayed other) |
| { |
| if (other == this) // compare zero if same object |
| return 0; |
| if (other instanceof ScheduledTask) { |
| ScheduledTask<?> x = (ScheduledTask<?>)other; |
| long diff = nextExecuteAtMillis - x.nextExecuteAtMillis; |
| if (diff < 0) |
| return -1; |
| else if (diff > 0) |
| return 1; |
| else if (sequenceNumber < x.sequenceNumber) |
| return -1; |
| else |
| return 1; |
| } |
| long diff = getDelay(NANOSECONDS) - other.getDelay(NANOSECONDS); |
| return (diff < 0) ? -1 : (diff > 0) ? 1 : 0; |
| } |
| |
| @Override |
| public void run() |
| { |
| if (canceled) |
| return; |
| boolean periodic = periodMillis != 0; |
| if (!periodic) |
| { |
| super.run(); |
| } |
| else |
| { |
| // run without setting the result |
| try |
| { |
| callable.call(); |
| long nowMillis = pending.nowInMillis(); |
| if (periodMillis > 0) |
| { |
| // scheduleAtFixedRate |
| nextExecuteAtMillis += periodMillis; |
| } |
| else |
| { |
| // scheduleWithFixedDelay |
| nextExecuteAtMillis = nowMillis + (-periodMillis); |
| } |
| long delayMillis = nextExecuteAtMillis - nowMillis; |
| if (delayMillis < 0) |
| delayMillis = 0; |
| schedule(this, delayMillis, TimeUnit.MILLISECONDS); |
| } |
| catch (Throwable t) |
| { |
| trySetResult(null, t); |
| } |
| } |
| } |
| |
| @Override |
| public boolean cancel(boolean mayInterruptIfRunning) |
| { |
| if (canceled) |
| return false; |
| canceled = true; |
| return pending.remove(this); |
| } |
| } |
| |
| private final PendingQueue pending; |
| private final Agent agent; |
| private final RandomSource random; |
| private final RandomLong jitterInNano; |
| private long sequenceNumber; |
| |
| public SimulatedDelayedExecutorService(PendingQueue pending, Agent agent, RandomSource random) |
| { |
| this.pending = pending; |
| this.agent = agent; |
| this.random = random; |
| // this is different from Apache Cassandra Simulator as this is computed differently for each executor |
| // rather than being a global config |
| double ratio = random.nextInt(1, 11) / 100.0D; |
| this.jitterInNano = new FrequentLargeRange(new RandomWalkRange(random, microToNanos(0), microToNanos(50)), |
| new RandomWalkRange(random, microToNanos(50), msToNanos(5)), |
| ratio); |
| } |
| |
| private static int msToNanos(int value) |
| { |
| return Math.toIntExact(TimeUnit.MILLISECONDS.toNanos(value)); |
| } |
| |
| private static int microToNanos(int value) |
| { |
| return Math.toIntExact(TimeUnit.MICROSECONDS.toNanos(value)); |
| } |
| |
| @Override |
| public void execute(Task<?> task) |
| { |
| pending.add(task, jitterInNano.getLong(random), TimeUnit.NANOSECONDS); |
| } |
| |
| private void schedule(Task<?> task, long delay, TimeUnit unit) |
| { |
| pending.add(task, unit.toNanos(delay) + jitterInNano.getLong(random), TimeUnit.NANOSECONDS); |
| } |
| |
| @Override |
| public Agent agent() |
| { |
| return agent; |
| } |
| |
| @Override |
| public ScheduledFuture<?> schedule(Runnable command, long delay, TimeUnit unit) |
| { |
| ScheduledTask<?> task = new ScheduledTask<>(sequenceNumber++, delay, 0, NANOSECONDS, Executors.callable(command)); |
| schedule(task, delay, unit); |
| return task; |
| } |
| |
| @Override |
| public <V> ScheduledFuture<V> schedule(Callable<V> callable, long delay, TimeUnit unit) |
| { |
| ScheduledTask<V> task = new ScheduledTask<>(sequenceNumber++, delay, 0, NANOSECONDS, callable); |
| schedule(task, delay, unit); |
| return task; |
| } |
| |
| @Override |
| public ScheduledFuture<?> scheduleAtFixedRate(Runnable command, long initialDelay, long period, TimeUnit unit) |
| { |
| ScheduledTask<?> task = new ScheduledTask<>(sequenceNumber++, initialDelay, period, unit, Executors.callable(command)); |
| schedule(task, initialDelay, unit); |
| return task; |
| } |
| |
| |
| @Override |
| public ScheduledFuture<?> scheduleWithFixedDelay(Runnable command, long initialDelay, long delay, TimeUnit unit) |
| { |
| ScheduledTask<?> task = new ScheduledTask<>(sequenceNumber++, initialDelay, -delay, unit, Executors.callable(command)); |
| schedule(task, initialDelay, unit); |
| return task; |
| } |
| } |