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package com.pdd.pop.ext.glassfish.grizzly.http.server;

import com.pdd.pop.ext.glassfish.grizzly.Connection;

/**
 * Monitoring probe providing callbacks that may be invoked by Grizzly {@link HttpServerFilter}.
 *
 * @author Alexey Stashok
 *
 * @since 2.0
 */
public interface HttpServerProbe {
    /**
     * Method will be called, when new {@link Request} will come.
     *
     * @param filter {@link HttpServerFilter}, the event belongs to.
     * @param connection {@link Connection}, the event belongs to.
     * @param request received {@link Request}.
     */
    void onRequestReceiveEvent(HttpServerFilter filter,
                               Connection connection, Request request);

    /**
     * Method will be called, when {@link Request} processing will be completed.
     *
     * @param filter {@link HttpServerFilter}, the event belongs to.
     * @param connection {@link Connection}, the event belongs to.
     * @param response sent {@link Response}.
     */
    void onRequestCompleteEvent(HttpServerFilter filter,
                                Connection connection, Response response);

    /**
     * Method will be called, when {@link Request} processing is suspended.
     *
     * @param filter {@link HttpServerFilter}, the event belongs to.
     * @param connection {@link Connection}, the event belongs to.
     * @param request {@link Request}.
     */
    void onRequestSuspendEvent(HttpServerFilter filter,
                               Connection connection, Request request);

    /**
     * Method will be called, when {@link Request} processing is resumed.
     *
     * @param filter {@link HttpServerFilter}, the event belongs to.
     * @param connection {@link Connection}, the event belongs to.
     * @param request {@link Request}.
     */
    void onRequestResumeEvent(HttpServerFilter filter,
                              Connection connection, Request request);

    /**
     * Method will be called, when {@link Request} processing is timeout
     * after suspend.
     *
     * @param filter {@link HttpServerFilter}, the event belongs to.
     * @param connection {@link Connection}, the event belongs to.
     * @param request {@link Request}.
     */
    void onRequestTimeoutEvent(HttpServerFilter filter,
                               Connection connection, Request request);

    /**
     * Method will be called, when {@link Request} processing is cancelled
     * after suspend.
     *
     * @param filter {@link HttpServerFilter}, the event belongs to.
     * @param connection {@link Connection}, the event belongs to.
     * @param request {@link Request}.
     */
    void onRequestCancelEvent(HttpServerFilter filter,
                              Connection connection, Request request);

    /**
     * Method will be called, before invoking
     * {@link HttpHandler#service(com.pdd.pop.ext.glassfish.grizzly.http.server.Request, com.pdd.pop.ext.glassfish.grizzly.http.server.Response)}.
     *
     * @param filter {@link HttpServerFilter}, the event belongs to.
     * @param connection {@link Connection}, the event belongs to.
     * @param request received {@link Request}.
     * @param httpHandler {@link HttpHandler} to be invoked.
     */
    void onBeforeServiceEvent(HttpServerFilter filter,
                              Connection connection, Request request, HttpHandler httpHandler);
    
    // ---------------------------------------------------------- Nested Classes


    /**
     * {@link HttpServerProbe} adapter that provides no-op implementations for
     * all interface methods allowing easy extension by the developer.
     *
     * @since 2.1.9
     */
    @SuppressWarnings("UnusedDeclaration")
    class Adapter implements HttpServerProbe {


        // ---------------------------------------- Methods from HttpServerProbe

        /**
         * {@inheritDoc}
         */
        @Override
        public void onRequestReceiveEvent(HttpServerFilter filter, Connection connection, Request request) {}

        /**
         * {@inheritDoc}
         */
        @Override
        public void onRequestCompleteEvent(HttpServerFilter filter, Connection connection, Response response) {}

        /**
         * {@inheritDoc}
         */
        @Override
        public void onRequestSuspendEvent(HttpServerFilter filter, Connection connection, Request request) {}

        /**
         * {@inheritDoc}
         */
        @Override
        public void onRequestResumeEvent(HttpServerFilter filter, Connection connection, Request request) {}

        /**
         * {@inheritDoc}
         */
        @Override
        public void onRequestTimeoutEvent(HttpServerFilter filter, Connection connection, Request request) {}


        @Override
        public void onRequestCancelEvent(HttpServerFilter filter, Connection connection, Request request) {}

        /**
         * {@inheritDoc}
         */
        @Override
        public void onBeforeServiceEvent(HttpServerFilter filter, Connection connection, Request request, HttpHandler httpHandler) {}
    }
}




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