/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.common.util.concurrent;
import org.elasticsearch.common.Priority;
import java.util.concurrent.TimeUnit;
/**
*
*/
public abstract class PrioritizedRunnable implements Runnable, Comparable<PrioritizedRunnable> {
private final Priority priority;
private final long creationDate;
private final LongSupplier relativeTimeProvider;
interface LongSupplier {
long getAsLong();
}
private static final LongSupplier SYSTEM_NANO_TIME = new LongSupplier() {
@Override
public long getAsLong() {
return System.nanoTime();
}
};
public static PrioritizedRunnable wrap(Runnable runnable, Priority priority) {
return new Wrapped(runnable, priority);
}
protected PrioritizedRunnable(Priority priority) {
this(priority, SYSTEM_NANO_TIME);
}
// package visible for testing
PrioritizedRunnable(Priority priority, LongSupplier relativeTimeProvider) {
this.priority = priority;
this.creationDate = relativeTimeProvider.getAsLong();
this.relativeTimeProvider = relativeTimeProvider;
}
public long getCreationDateInNanos() {
return creationDate;
}
public long getAgeInMillis() {
return TimeUnit.MILLISECONDS.convert(relativeTimeProvider.getAsLong() - creationDate, TimeUnit.NANOSECONDS);
}
@Override
public int compareTo(PrioritizedRunnable pr) {
return priority.compareTo(pr.priority);
}
public Priority priority() {
return priority;
}
static class Wrapped extends PrioritizedRunnable {
private final Runnable runnable;
private Wrapped(Runnable runnable, Priority priority) {
super(priority);
this.runnable = runnable;
}
@Override
public void run() {
runnable.run();
}
}
}