com.netflix.fenzo.DefaultFitnessCalculator Maven / Gradle / Ivy
/*
* Copyright 2015 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.fenzo;
/**
* A default fitness calculator that always finds any target to be perfectly fit for any task. A fitness
* calculator computes * a value between 0.0 and 1.0 to indicate the confidence with which it believes a
* particular target is suitable for a particular task, with 0.0 signifying that it is completely unconfident,
* and 1.0 signifying that it is completely confident. This default fitness calculator always computes this
* value to be 1.0, meaning that it always believes a target and a task are well matched for each other.
*/
public class DefaultFitnessCalculator implements VMTaskFitnessCalculator {
public DefaultFitnessCalculator() {
}
/**
* Returns the name of this fitness calculator (the class name).
*
* @return the name of this fitness calculator
*/
@Override
public String getName() {
return DefaultFitnessCalculator.class.getName();
}
/**
* Computes the suitability of {@code targetVM} to take on the task described by {@code taskRequest} to be
* 1.0 (fully suitable).
*
* @param taskRequest a description of the task to be assigned
* @param targetVM a description of the host to which the task may potentially be assigned
* @param taskTrackerState the state of tasks and task assignments in the system at large
* @return 1.0
*/
@Override
public double calculateFitness(TaskRequest taskRequest, VirtualMachineCurrentState targetVM, TaskTrackerState taskTrackerState) {
return 1.0;
}
}