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/*
 * RED5 Open Source Media Server - https://github.com/Red5/
 * 
 * Copyright 2006-2016 by respective authors (see below). All rights reserved.
 * 
 * Licensed 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.red5.server.api.persistence;

import java.util.Collection;
import java.util.Set;

/**
 * Storage for persistent objects.
 * 
 * @author The Red5 Project
 * @author Luke Hubbard ([email protected])
 * @author Joachim Bauch ([email protected])
 */

public interface IPersistenceStore {

    /**
     * Persist given object.
     * 
     * @param obj
     *            Object to store
     * @return      * true
     * 
     * 
     *         on success,
     * 
     *              * false
     * 
     * 
     *         otherwise
     */
    public boolean save(IPersistable obj);

    /**
     * Load a persistent object with the given name. The object must provide either a constructor that takes an input stream as only parameter or an empty constructor so it can be loaded from the persistence store.
     * 
     * @param name
     *            the name of the object to load
     * @return The loaded object or
     * 
     *              * null
     * 
     * 
     *         if no such object was found
     */
    public IPersistable load(String name);

    /**
     * Load state of an already instantiated persistent object.
     * 
     * @param obj
     *            the object to initializ
     * @return true if the object was initialized, false otherwise
     */
    public boolean load(IPersistable obj);

    /**
     * Delete the passed persistent object.
     * 
     * @param obj
     *            the object to delete
     * @return      * true
     * 
     * 
     *         if object was persisted and thus can be removed,
     * 
     *              * false
     * 
     * 
     *         otherwise
     */
    public boolean remove(IPersistable obj);

    /**
     * Delete the persistent object with the given name.
     * 
     * @param name
     *            the name of the object to delete
     * @return      * true
     * 
     * 
     *         if object was persisted and thus can be removed,
     * 
     *              * false
     * 
     * 
     *         otherwise
     */
    public boolean remove(String name);

    /**
     * Return iterator over the names of all already loaded objects in the storage.
     * 
     * @return Set of all object names
     */
    public Set getObjectNames();

    /**
     * Return iterator over the already loaded objects in the storage.
     * 
     * @return Set of all objects
     */
    public Collection getObjects();

    /**
     * Notify store that it's being closed. This allows the store to write any pending objects to disk.
     */
    public void notifyClose();

}