| /** |
| * 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.hadoop.ozone.container.common.interfaces; |
| |
| import org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos; |
| import org.apache.hadoop.hdds.scm.container.common.helpers |
| .StorageContainerException; |
| import org.apache.hadoop.ozone.container.common.impl.ContainerData; |
| import org.apache.hadoop.ozone.container.keyvalue.statemachine.background.BlockDeletingService.ContainerBlockInfo; |
| |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * This interface is used for choosing desired containers for |
| * block deletion. |
| */ |
| public interface ContainerDeletionChoosingPolicy { |
| |
| /** |
| * Chooses desired containers for block deletion. |
| * @param count |
| * how many to return |
| * @param candidateContainers |
| * candidate containers collection |
| * @return container data list |
| * @throws StorageContainerException |
| */ |
| List<ContainerBlockInfo> chooseContainerForBlockDeletion( |
| int count, Map<Long, ContainerData> candidateContainers) |
| throws StorageContainerException; |
| |
| /** |
| * Determine if the container has suitable type for this policy. |
| * @param type type of the container |
| * @return whether the container type suitable for this policy. |
| */ |
| default boolean isValidContainerType(ContainerProtos.ContainerType type) { |
| if (type == ContainerProtos.ContainerType.KeyValueContainer) { |
| return true; |
| } |
| return false; |
| } |
| } |