org.trypticon.luceneupgrader.lucene6.internal.lucene.util.Counter 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.trypticon.luceneupgrader.lucene6.internal.lucene.util;
import java.util.concurrent.atomic.AtomicLong;
/**
* Simple counter class
*
* @lucene.internal
* @lucene.experimental
*/
public abstract class Counter {
/**
* Adds the given delta to the counters current value
*
* @param delta
* the delta to add
* @return the counters updated value
*/
public abstract long addAndGet(long delta);
/**
* Returns the counters current value
*
* @return the counters current value
*/
public abstract long get();
/**
* Returns a new counter. The returned counter is not thread-safe.
*/
public static Counter newCounter() {
return newCounter(false);
}
/**
* Returns a new counter.
*
* @param threadSafe
* true if the returned counter can be used by multiple
* threads concurrently.
* @return a new counter.
*/
public static Counter newCounter(boolean threadSafe) {
return threadSafe ? new AtomicCounter() : new SerialCounter();
}
private final static class SerialCounter extends Counter {
private long count = 0;
@Override
public long addAndGet(long delta) {
return count += delta;
}
@Override
public long get() {
return count;
};
}
private final static class AtomicCounter extends Counter {
private final AtomicLong count = new AtomicLong();
@Override
public long addAndGet(long delta) {
return count.addAndGet(delta);
}
@Override
public long get() {
return count.get();
}
}
}