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/* Copyright (c) 2001-2008, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
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 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 */


package org.hsqldb.persist;

import java.io.IOException;

import org.hsqldb.rowio.RowInputInterface;

/**
 * Interface for a store for CachedObject object.
 *
 * @author fredt@users
 * @version 1.8.0
 * @since 1.8.0
 */
public interface PersistentStore {

    int INT_STORE_SIZE  = 4;
    int LONG_STORE_SIZE = 8;

    /** get object */
    CachedObject get(int key);

    /** get object, ensuring future gets will return the same instance of the object */
    CachedObject getKeep(int key);

    int getStorageSize(int key);

    /** add new object */
    void add(CachedObject object) throws IOException;

    /** add object previously removed from persistnce */
    void restore(CachedObject object) throws IOException;

    CachedObject get(RowInputInterface in) throws IOException;

    CachedObject getNewInstance(int size) throws IOException;

    /** remove the persisted image but not the cached copy */
    void removePersistence(int i);

    /** remove both persisted and cached copies */
    void remove(int i);

    /** remove the cached copies */
    void release(int i);

    /** commit persisted image */
    void commit(CachedObject object);
}