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package java.security;


A computation to be performed with privileges enabled, that throws one or more checked exceptions. The computation is performed by invoking AccessController.doPrivileged on the PrivilegedExceptionAction object. This interface is used only for computations that throw checked exceptions; computations that do not throw checked exceptions should use PrivilegedAction instead. 
See Also:
AccessController
AccessController.doPrivileged(PrivilegedExceptionAction<Object>)
AccessController.doPrivileged(PrivilegedExceptionAction<Object>, AccessControlContext)
PrivilegedAction
Since:
1.2/**
 * A computation to be performed with privileges enabled, that throws one or
 * more checked exceptions.  The computation is performed by invoking
 * {@code AccessController.doPrivileged} on the
 * {@code PrivilegedExceptionAction} object.  This interface is
 * used only for computations that throw checked exceptions;
 * computations that do not throw
 * checked exceptions should use {@code PrivilegedAction} instead.
 *
 * @since 1.2
 * @see AccessController
 * @see AccessController#doPrivileged(PrivilegedExceptionAction)
 * @see AccessController#doPrivileged(PrivilegedExceptionAction,
 *                                              AccessControlContext)
 * @see PrivilegedAction
 */
@FunctionalInterface
public interface PrivilegedExceptionAction<T> {
    
Performs the computation. This method will be called by AccessController.doPrivileged after enabling privileges. 
Throws:
Exception – an exceptional condition has occurred. Each class that implements PrivilegedExceptionAction should document the exceptions that its run method can throw.
See Also:
AccessController.doPrivileged(PrivilegedExceptionAction<Object>)
AccessController.doPrivileged(PrivilegedExceptionAction<Object>, AccessControlContext)
Returns:
a class-dependent value that may represent the results of the computation. Each class that implements PrivilegedExceptionAction should document what (if anything) this value represents./**
     * Performs the computation.  This method will be called by
     * {@code AccessController.doPrivileged} after enabling privileges.
     *
     * @return a class-dependent value that may represent the results of the
     *         computation.  Each class that implements
     *         {@code PrivilegedExceptionAction} should document what
     *         (if anything) this value represents.
     * @throws Exception an exceptional condition has occurred.  Each class
     *         that implements {@code PrivilegedExceptionAction} should
     *         document the exceptions that its run method can throw.
     * @see AccessController#doPrivileged(PrivilegedExceptionAction)
     * @see AccessController#doPrivileged(PrivilegedExceptionAction,AccessControlContext)
     */

    T run() throws Exception;
}