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package javax.ws.rs.container;

/**
 * A request processing callback that receives request processing completion events.
 * <p>
 * A completion callback is invoked when the whole request processing is over, i.e.
 * once a response for the request has been processed and sent back to the client
 * or in when an unmapped exception or error is being propagated to the container.
 * </p>
 *
 * @author Marek Potociar
 * @since 2.0
 */
public interface CompletionCallback {
    /**
     * A completion callback notification method that will be invoked when the request
     * processing is finished, after a response is processed and is sent back to the
     * client or when an unmapped throwable has been propagated to the hosting I/O
     * container.
     * <p>
     * An unmapped throwable is propagated to the hosting I/O container in case no
     * {@link javax.ws.rs.ext.ExceptionMapper exception mapper} has been found for
     * a throwable indicating a request processing failure.
     * In this case a non-{@code null} unmapped throwable instance is passed to the method.
     * Note that the throwable instance represents the actual unmapped exception thrown
     * during the request processing, before it has been wrapped into an I/O container-specific
     * exception that was used to propagate the throwable to the hosting I/O container.
     * </p>
     *
     * @param throwable is {@code null}, if the request processing has completed with a response
     *                  that has been sent to the client. In case the request processing resulted
     *                  in an unmapped exception or error that has been propagated to the hosting
     *                  I/O container, this parameter contains the unmapped exception instance.
     */
    public void onComplete(Throwable throwable);
}
