com.netflix.fenzo.VMTaskFitnessCalculator Maven / Gradle / Ivy

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/*
 * 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;

public interface VMTaskFitnessCalculator {
    public String getName();
    /**
     * This is called by TaskScheduler during a scheduler run after a task's resource requirements are met by
     * a VirtualMachineCurrentState.
     * @param taskRequest  The task whose resource requirements can be met by the Virtual Machine.
     * @param targetVM     The prospective target Virtual Machine for given {@code taskRequest}.
     * @param taskTrackerState State of the task tracker that contains all tasks currently running and assigned
     * @return A value between 0.0 and 1.0, with higher values representing better fit of the task on the virtual machine.
     */
    public double calculateFitness(TaskRequest taskRequest, VirtualMachineCurrentState targetVM,
                                   TaskTrackerState taskTrackerState);
}