/*
*
* 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.hbase.util;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
/**
* Uses an incrementing algorithm instead of the default.
*/
@InterfaceAudience.Private
public class IncrementingEnvironmentEdge implements EnvironmentEdge {
private long timeIncrement;
/**
* Construct an incremental edge starting from currentTimeMillis
*/
public IncrementingEnvironmentEdge() {
this(System.currentTimeMillis());
}
/**
* Construct an incremental edge with an initial amount
* @param initialAmount the initial value to start with
*/
public IncrementingEnvironmentEdge(long initialAmount) {
this.timeIncrement = initialAmount;
}
/**
* {@inheritDoc}
* <p/>
* This method increments a known value for the current time each time this
* method is called. The first value is 1.
*/
@Override
public synchronized long currentTime() {
return timeIncrement++;
}
/**
* Increment the time by the given amount
*/
public synchronized long incrementTime(long amount) {
timeIncrement += amount;
return timeIncrement;
}
}