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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.
 *
 * <p>
 * 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.
 *
 * <p>
 * If this annotation is not used, a value of <code>Lock(WRITE)</code> is
 * assumed.
 *
 * @since EJB 3.1
 */

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

    LockType value() default LockType.WRITE;

}