| /** |
| * 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 org.apache.aurora.scheduler.updater.strategy; |
| |
| import java.util.Set; |
| |
| /** |
| * A strategy that chooses which instances in a group to update next. |
| */ |
| public interface UpdateStrategy<T> { |
| |
| /** |
| * Gets the next group to update. |
| * |
| * @param idle Idle instances, candidate for being updated. |
| * @param active Instances currently being updated. |
| * @return A subset of {@code idle}, instances to start updating. |
| */ |
| Set<T> getNextGroup(Set<T> idle, Set<T> active); |
| } |