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Jakarta Enterprise Beans API

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/*
 * 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;

import java.lang.annotation.Target;
import static java.lang.annotation.ElementType.*;
import java.lang.annotation.Retention;
import static java.lang.annotation.RetentionPolicy.*;

/**
 * Declares a concurrency lock for a singleton session bean
 * with container managed concurrency.
 *
 * 
 * This annotation may be specified on the bean class, the business methods
 * of the bean class or both.  Specifying the annotation on a business method
 * overrides the value specified at class level, if any.
 *
 * 
 * If this annotation is not used, a value of Lock(WRITE) is
 * assumed.
 *
 * @since EJB 3.1
 */

@Target({TYPE, METHOD}) 
@Retention(RUNTIME)
public @interface Lock {

    LockType value() default LockType.WRITE;

}