com.netflix.control.controllers.Derivative Maven / Gradle / Ivy
/*
* Copyright 2019 Netflix, Inc.
*
* 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.netflix.control.controllers;
import com.netflix.control.IController;
public class Derivative extends IController {
private double last = 0;
private boolean initialized = false;
@Override
protected Double processStep(Double input) {
if (initialized) {
double output = input - last;
this.last = input;
return output;
} else {
return 0.0;
}
}
}