| /* |
| * 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.servicemix.store; |
| |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.Set; |
| |
| /** |
| * A Store is an interface representing a storage where objects can be |
| * put and retrieved. A store can support different features, mainly |
| * persistence, clustered or transactional. |
| * |
| * A store is not designed to be a thread-safe map. If a user tries to |
| * store an object with an existing id, the behavior is undefined. |
| * |
| * @author gnodet |
| */ |
| public interface Store { |
| |
| String PERSISTENT = "Persistent"; |
| |
| String CLUSTERED = "Clustered"; |
| |
| String TRANSACTIONAL = "Transactional"; |
| |
| /** |
| * Returns true if the store implementation supports the given feature. |
| * @param name the feature to check |
| * @return <code>true</code> if the feature is supported |
| */ |
| boolean hasFeature(String name); |
| |
| /** |
| * Put an object in the store under the given id. |
| * This method must be used with caution and the behavior is |
| * unspecified if an object already exist for the same id. |
| * |
| * @param id the id of the object to store |
| * @param data the object to store |
| * @throws IOException if an error occurs |
| */ |
| void store(String id, Object data) throws IOException; |
| |
| /** |
| * Put an object into the store and return the unique id that |
| * may be used at a later time to retrieve the object. |
| * |
| * @param data the object to store |
| * @return the id of the object stored |
| * @throws IOException if an error occurs |
| */ |
| String store(Object data) throws IOException; |
| |
| /** |
| * Loads an object that has been previously stored under the specified key. |
| * The object is removed from the store. |
| * |
| * @param id the id of the object |
| * @return the object, or <code>null></code> if the object could not be found |
| * @throws IOException if an error occurs |
| */ |
| Object load(String id) throws IOException; |
| |
| /** |
| * Loads an object that has been previously stored under the specified key. |
| * The object is not removed from the store. |
| * |
| * @param id the id of the object |
| * @return the object, or <code>null</code> if the object could not be found |
| * @throws IOException if an error occurs |
| */ |
| Object peek(String id) throws IOException; |
| |
| |
| |
| /*** |
| * Registers a {@link StoreListener}. |
| * @param listener |
| */ |
| void addListener(StoreListener listener); |
| |
| |
| /*** |
| * Unregisters a {@link StoreListener}. |
| * @param listener |
| */ |
| void removeListener(StoreListener listener); |
| |
| /*** |
| * Lists all {@link StoreListener}s. |
| */ |
| public Set<StoreListener> getStoreListeners(); |
| |
| } |