| /** |
| * 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.hdfs.server.federation.resolver; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.hdfs.server.federation.store.protocol.AddMountTableEntryRequest; |
| import org.apache.hadoop.hdfs.server.federation.store.protocol.AddMountTableEntryResponse; |
| import org.apache.hadoop.hdfs.server.federation.store.protocol.GetMountTableEntriesRequest; |
| import org.apache.hadoop.hdfs.server.federation.store.protocol.GetMountTableEntriesResponse; |
| import org.apache.hadoop.hdfs.server.federation.store.protocol.RemoveMountTableEntryRequest; |
| import org.apache.hadoop.hdfs.server.federation.store.protocol.RemoveMountTableEntryResponse; |
| import org.apache.hadoop.hdfs.server.federation.store.protocol.UpdateMountTableEntryRequest; |
| import org.apache.hadoop.hdfs.server.federation.store.protocol.UpdateMountTableEntryResponse; |
| |
| /** |
| * Manage a mount table. |
| */ |
| public interface MountTableManager { |
| |
| /** |
| * Add an entry to the mount table. |
| * |
| * @param request Fully populated request object. |
| * @return True if the mount table entry was successfully committed to the |
| * data store. |
| * @throws IOException Throws exception if the data store is not initialized. |
| */ |
| AddMountTableEntryResponse addMountTableEntry( |
| AddMountTableEntryRequest request) throws IOException; |
| |
| /** |
| * Updates an existing entry in the mount table. |
| * |
| * @param request Fully populated request object. |
| * @return True if the mount table entry was successfully committed to the |
| * data store. |
| * @throws IOException Throws exception if the data store is not initialized. |
| */ |
| UpdateMountTableEntryResponse updateMountTableEntry( |
| UpdateMountTableEntryRequest request) throws IOException; |
| |
| /** |
| * Remove an entry from the mount table. |
| * |
| * @param request Fully populated request object. |
| * @return True the mount table entry was removed from the data store. |
| * @throws IOException Throws exception if the data store is not initialized. |
| */ |
| RemoveMountTableEntryResponse removeMountTableEntry( |
| RemoveMountTableEntryRequest request) throws IOException; |
| |
| /** |
| * List all mount table entries present at or below the path. Fetches from the |
| * state store. |
| * |
| * @param request Fully populated request object. |
| * |
| * @return List of all mount table entries under the path. Zero-length list if |
| * none are found. |
| * @throws IOException Throws exception if the data store cannot be queried. |
| */ |
| GetMountTableEntriesResponse getMountTableEntries( |
| GetMountTableEntriesRequest request) throws IOException; |
| } |