| /** |
| * 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.distributedlog.metadata; |
| |
| import java.io.IOException; |
| import java.net.URI; |
| |
| /** |
| * Resolver to resolve the metadata used to instantiate a DL instance. |
| * |
| * <p> |
| * E.g. we stored a common dl config under /messaging/distributedlog to use |
| * bookkeeper cluster x. so all the distributedlog instances under this path |
| * inherit this dl config. if a dl D is allocated under /messaging/distributedlog, |
| * but use a different cluster y, so its metadata is stored /messaging/distributedlog/D. |
| * The resolver resolve the URI |
| * </p> |
| * |
| * <p> |
| * The resolver looks up the uri path and tries to interpret the path segments from |
| * bottom-to-top to see if there is a DL metadata bound. It stops when it found valid |
| * dl metadata. |
| * </p> |
| */ |
| public interface MetadataResolver { |
| |
| /** |
| * Resolve the path to get the DL metadata. |
| * |
| * @param uri |
| * dl uri |
| * @return dl metadata. |
| * @throws IOException |
| */ |
| public DLMetadata resolve(URI uri) throws IOException; |
| } |