| /* |
| * 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.nemo.runtime.master.scheduler; |
| |
| import net.jcip.annotations.ThreadSafe; |
| import org.apache.nemo.runtime.common.plan.Task; |
| import org.apache.nemo.runtime.master.resource.ExecutorRepresenter; |
| import org.apache.reef.annotations.audience.DriverSide; |
| import org.apache.reef.tang.annotations.DefaultImplementation; |
| |
| import java.util.Collection; |
| |
| /** |
| * A function to select an executor from collection of available executors. |
| */ |
| @DriverSide |
| @ThreadSafe |
| @FunctionalInterface |
| @DefaultImplementation(MinOccupancyFirstSchedulingPolicy.class) |
| public interface SchedulingPolicy { |
| /** |
| * A function to select an executor from the specified collection of available executors. |
| * |
| * @param executors The collection of available executors. |
| * Implementations can assume that the collection is not empty. |
| * @param task The task to schedule |
| * @return The selected executor. It must be a member of {@code executors}. |
| */ |
| ExecutorRepresenter selectExecutor(final Collection<ExecutorRepresenter> executors, final Task task); |
| } |