| package org.apache.helix.store; |
| |
| /* |
| * 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. |
| */ |
| |
| import org.apache.helix.BaseDataAccessor; |
| |
| public interface HelixPropertyStore<T> extends BaseDataAccessor<T> { |
| /** |
| * Perform resource allocation when property store starts |
| * Resource allocation includes: - start an internal thread for fire callbacks |
| */ |
| public void start(); |
| |
| /** |
| * Perform clean up when property store stops |
| * Cleanup includes: - stop the internal thread for fire callbacks |
| */ |
| public void stop(); |
| |
| /** |
| * Register a listener to a parent path. |
| * Subscribing to a parent path means any changes happening under the parent path will |
| * notify the listener |
| * @param parentPath |
| * @param listener |
| */ |
| public void subscribe(String parentPath, HelixPropertyListener listener); |
| |
| /** |
| * Remove a listener from a parent path. |
| * This will remove the listener from receiving any notifications happening under the |
| * parent path |
| * @param parentPath |
| * @param listener |
| */ |
| public void unsubscribe(String parentPath, HelixPropertyListener listener); |
| } |