javax.ejb.LockType Maven / Gradle / Ivy

/*
 * Copyright (c) 2006, 2018 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.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package javax.ejb;

/**
 * Concurrency lock type for singleton beans with container-managed concurrency.
 *
 * @since EJB 3.1
 */
public enum LockType {

    /**
     * For read-only operations.  Allows simultaneous access to methods
     * designated as READ, as long as no WRITE lock is held.  
     */
    READ,

    /**
     * For exclusive access to the bean instance.  A WRITE lock can only
     * be acquired when no other method with either a READ or 
     * WRITE lock is currently held.
     */
    WRITE
}