org.apache.hadoop.fs.s3a.statistics.impl.CountingChangeTracker 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.hadoop.fs.s3a.statistics.impl;
import java.util.concurrent.atomic.AtomicLong;
import org.apache.hadoop.fs.s3a.statistics.ChangeTrackerStatistics;
/**
* A change tracker which increments an atomic long.
*/
public class CountingChangeTracker implements
ChangeTrackerStatistics {
/**
* The counter which is updated on every mismatch.
*/
private final AtomicLong counter;
public CountingChangeTracker(final AtomicLong counter) {
this.counter = counter;
}
public CountingChangeTracker() {
this(new AtomicLong());
}
@Override
public void versionMismatchError() {
counter.incrementAndGet();
}
@Override
public long getVersionMismatches() {
return counter.get();
}
}