/*
* Copyright 1999-2012 Alibaba Group.
*
* Licensed 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 com.alibaba.cobar.manager.util;
/**
* (created at 2010-9-28)
*
* @author <a href="mailto:shuo.qius@alibaba-inc.com">QIU Shuo</a>
* @author wenfeng.cenwf 2011-4-16
* @author haiqing.zhuhq 2011-9-1
*/
public class MathUtil {
public static double getDerivate(long newVal, long oldVal, long timestamp, long oldtimestamp, double scale) {
return timestamp - oldtimestamp == 0 ? 0 : (newVal - oldVal) * scale / (timestamp - oldtimestamp);
}
}