| /* |
| * 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.reef.runtime.common.driver; |
| |
| import org.apache.reef.annotations.Unstable; |
| import org.apache.reef.annotations.audience.DriverSide; |
| import org.apache.reef.annotations.audience.Private; |
| import org.apache.reef.annotations.audience.RuntimeAuthor; |
| |
| import java.util.Set; |
| |
| /** |
| * A interface to preserve evaluators across driver restarts. |
| */ |
| @DriverSide |
| @Private |
| @RuntimeAuthor |
| @Unstable |
| public interface EvaluatorPreserver { |
| /** |
| * Called on driver restart when evaluators are to be recovered. |
| */ |
| Set<String> recoverEvaluators(); |
| |
| /** |
| * Called when an evaluator is to be preserved. |
| */ |
| void recordAllocatedEvaluator(String id); |
| |
| /** |
| * Called when an evaluator is to be removed. |
| * @param id |
| */ |
| void recordRemovedEvaluator(String id); |
| } |