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package org.checkerframework.checker.lock.qual;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.checkerframework.framework.qual.PreconditionAnnotation;
/**
* Indicates a method precondition: the specified expressions must be held when the annotated method
* is invoked.
*
* The argument is a string or set of strings that indicates the expression(s) that must be held,
* using the syntax of
* Java expressions described in the manual. The expressions evaluate to an intrinsic (built-in,
* synchronization) monitor, or an explicit {@link java.util.concurrent.locks.Lock}.
*
* @see GuardedBy
* @checker_framework.manual #lock-checker Lock Checker
* @checker_framework.manual #lock-examples-holding Example use of @Holding
*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.CONSTRUCTOR})
@PreconditionAnnotation(qualifier = LockHeld.class)
public @interface Holding {
/**
* The Java expressions that need to be held.
*
* @see Syntax of
* Java expressions
*/
String[] value();
}