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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.io.IOException;

import org.red5.io.object.Input;
import org.red5.io.object.Output;

/**
 * Base interface for objects that can be made persistent.
 * 
 * Every object that complies to this interface 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.
 * 
 * However this is not required for objects that are created by the application and initialized afterwards.
 * 
 * @see org.red5.io.object.Input
 * @see IPersistenceStore#load(String)
 * 
 * @author The Red5 Project
 * @author Luke Hubbard ([email protected])
 * @author Joachim Bauch ([email protected])
 */

public interface IPersistable {

    /**
     * Prefix for attribute names that should not be made persistent.
     */
    public static final String TRANSIENT_PREFIX = "_transient";

    /**
     * Returns
     * 
     *      * true
     * 
     * 
     * if the object is persistent,
     * 
     *      * false
     * 
     * 
     * otherwise.
     * 
     * @return      * true
     * 
     * 
     *         if object is persistent,
     * 
     *              * false
     * 
     * 
     *         otherwise
     */
    public boolean isPersistent();

    /**
     * Set the persistent flag of the object.
     * 
     * @param persistent
     *                 * true
     * 
     * 
     *            if object is persistent,
     * 
     *                 * false
     * 
     * 
     *            otherwise
     */
    public void setPersistent(boolean persistent);

    /**
     * Returns the name of the persistent object.
     * 
     * @return Object name
     */
    public String getName();

    /**
     * Set the name of the persistent object.
     * 
     * @param name
     *            New object name
     */
    public void setName(String name);

    /**
     * Returns the type of the persistent object.
     * 
     * @return Object type
     */
    public String getType();

    /**
     * Returns the path of the persistent object.
     * 
     * @return Persisted object path
     */
    public String getPath();

    /**
     * Set the path of the persistent object.
     * 
     * @param path
     *            New persisted object path
     */
    public void setPath(String path);

    /**
     * Returns the timestamp when the object was last modified.
     * 
     * @return Last modification date in milliseconds
     */
    public long getLastModified();

    /**
     * Returns the persistence store this object is stored in
     * 
     * @return This object's persistence store
     */
    public IPersistenceStore getStore();

    /**
     * Store a reference to the persistence store in the object.
     * 
     * @param store
     *            Store the object is saved in
     */
    void setStore(IPersistenceStore store);

    /**
     * Write the object to the passed output stream.
     * 
     * @param output
     *            Output stream to write to
     * @throws java.io.IOException
     *             Any I/O exception
     */
    void serialize(Output output) throws IOException;

    /**
     * Load the object from the passed input stream.
     * 
     * @param input
     *            Input stream to load from
     * @throws java.io.IOException
     *             Any I/O exception
     */
    void deserialize(Input input) throws IOException;

}