foundation/org.eclipse.persistence.core/src/main/java/org/eclipse/persistence/internal/sessions/ClientSessionIdentityMapAccessor.java

/*
 * Copyright (c) 1998, 2021 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//     Oracle - initial API and implementation from Oracle TopLink
package org.eclipse.persistence.internal.sessions;

import org.eclipse.persistence.internal.identitymaps.*;
import org.eclipse.persistence.internal.sessions.IdentityMapAccessor;
import org.eclipse.persistence.sessions.server.*;

/**
 * INTERNAL:
 * IdentityMapAccessor subclass for client sessions.
 * Note: A client session will always use it's parent session's IdentityMapManager
 */
public class ClientSessionIdentityMapAccessor extends IdentityMapAccessor {

    /**
     * INTERNAL:
     * Create a ClientSessionIdentityMapAccessor
     * Since the parent session's identity map manager is used, an IdentityMapManager
     * does not need to be supplied to the constructor
     */
    public ClientSessionIdentityMapAccessor(ClientSession session) {
        super(session, null);
    }

    /**
     * INTERNAL:
     * Was PUBLIC: customer will be redirected to {@link org.eclipse.persistence.sessions.Session}.
     * Reset the entire object cache.
     * This method blows away both this session's and its parents caches, including the server cache or any other cache.
     * This throws away any objects that have been read in.
     * Extreme caution should be used before doing this because object identity will no longer
     * be maintained for any objects currently read in.  This should only be called
     * if the application knows that it no longer has references to object held in the cache.
     */
    @Override
    public void initializeAllIdentityMaps() {
        ((ClientSession)session).getParent().getIdentityMapAccessor().initializeAllIdentityMaps();
    }

    /**
     * INTERNAL:
     * Return the IdentityMapManager for the client session.
     * This overrides the IdentityMapAccessor version of getIdentityMapManager to
     * return the parent session's IdentityMapManager
     */
    @Override
    public IdentityMapManager getIdentityMapManager() {
        return ((ClientSession)session).getParent().getIdentityMapAccessorInstance().getIdentityMapManager();
    }

    /**
     * INTERNAL:
     * The client session does not have a local identity map, so this has no effect and should not be used.
     */
    @Override
    public void initializeIdentityMap(Class<?> theClass) {
        // Do nothing
    }

    /**
     * INTERNAL:
     * The client session does not have a local identity map, so this has no effect and should not be used.
     */
    @Override
    public void initializeIdentityMaps() {
        // Do nothing
    }

    /**
     * INTERNAL:
     * The identity map manager cannot be set on a client session since it
     * looks at it's parent session's identity map manager.
     */
    @Override
    public void setIdentityMapManager(IdentityMapManager identityMapManager) {
    }
}