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The Java EJB 3.1 API classes

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package javax.ejb;

import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static javax.ejb.LockType.WRITE;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;

/**
 * Declares a concurrency lock for a singleton method.
 * 
 * @author Carlo de Wolf
 * @version $Revision$
 * @since 3.1
 */
@Target({METHOD,TYPE})
@Retention(RUNTIME)
public @interface Lock {
   LockType value() default WRITE;
}