| /** |
| * 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 com.twitter.distributedlog.metadata; |
| |
| import com.google.common.annotations.Beta; |
| import com.google.common.base.Optional; |
| import com.twitter.distributedlog.callback.NamespaceListener; |
| import com.twitter.util.Future; |
| |
| import java.net.URI; |
| import java.util.Iterator; |
| |
| /** |
| * Interface for log metadata store. |
| */ |
| @Beta |
| public interface LogMetadataStore { |
| |
| /** |
| * Create a stream and return it is namespace location. |
| * |
| * @param logName |
| * name of the log |
| * @return namespace location that stores this stream. |
| */ |
| Future<URI> createLog(String logName); |
| |
| /** |
| * Get the location of the log. |
| * |
| * @param logName |
| * name of the log |
| * @return namespace location that stores this stream. |
| */ |
| Future<Optional<URI>> getLogLocation(String logName); |
| |
| /** |
| * Retrieves logs from the namespace. |
| * |
| * @return iterator of logs of the namespace. |
| */ |
| Future<Iterator<String>> getLogs(); |
| |
| /** |
| * Register a namespace listener on streams changes. |
| * |
| * @param listener |
| * namespace listener |
| */ |
| void registerNamespaceListener(NamespaceListener listener); |
| } |