Glassfish example source code file (InstanceEvent.java)

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Java - Glassfish tags/keywords

after_filter_event, before_filter_event, eventtype, eventtype, filter, instanceevent, instanceevent, servlet, servlet, servletrequest, servletresponse, throwable, throwable, util, wrapper

The Glassfish InstanceEvent.java source code

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 * Copyright 2004 The Apache Software Foundation
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 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
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 *     http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.catalina;


import javax.servlet.Filter;
import javax.servlet.Servlet;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import java.util.EventObject;


/**
 * General event for notifying listeners of significant events related to
 * a specific instance of a Servlet, or a specific instance of a Filter,
 * as opposed to the Wrapper component that manages it.
 *
 * @author Craig R. McClanahan
 * @version $Revision: 1.2 $ $Date: 2005/12/08 01:27:17 $
 */

public final class InstanceEvent
    extends EventObject {


    // ----------------------------------------------------- Manifest Constants

    public enum EventType {

        /**
         * The event indicating that the <code>init() method is about
         * to be called for this instance.
         */
        BEFORE_INIT_EVENT("beforeInit"),


        /**
         * The event indicating that the <code>init() method has returned.
         */
        AFTER_INIT_EVENT("afterInit"),


        /**
         * The event indicating that the <code>service() method is about
         * to be called on a servlet.  The <code>servlet property contains
         * the servlet being called, and the <code>request and
         * <code>response properties contain the current request and
         * response being processed.
         */
        BEFORE_SERVICE_EVENT("beforeService"),


        /**
         * The event indicating that the <code>service() method has
         * returned.  The <code>servlet property contains the servlet
         * that was called, and the <code>request and
         * <code>response properties contain the current request and
         * response being processed.
         */
        AFTER_SERVICE_EVENT("afterService"),


        /**
         * The event indicating that the <code>destroy method is about
         * to be called for this instance.
         */
        BEFORE_DESTROY_EVENT("beforeDestroy"),


        /**
         * The event indicating that the <code>destroy() method has
         * returned.
         */
        AFTER_DESTROY_EVENT("afterDestroy"),


        /**
         * The event indicating that the <code>service() method of a
         * servlet accessed via a request dispatcher is about to be called.
         * The <code>servlet property contains a reference to the
         * dispatched-to servlet instance, and the <code>request and
         * <code>response properties contain the current request and
         * response being processed.  The <code>wrapper property will
         * contain a reference to the dispatched-to Wrapper.
         */
        BEFORE_DISPATCH_EVENT("beforeDispatch"),


        /**
         * The event indicating that the <code>service() method of a
         * servlet accessed via a request dispatcher has returned.  The
         * <code>servlet property contains a reference to the
         * dispatched-to servlet instance, and the <code>request and
         * <code>response properties contain the current request and
         * response being processed.  The <code>wrapper property will
         * contain a reference to the dispatched-to Wrapper.
         */
        AFTER_DISPATCH_EVENT("afterDispatch"),


        /**
         * The event indicating that the <code>doFilter() method of a
         * Filter is about to be called.  The <code>filter property
         * contains a reference to the relevant filter instance, and the
         * <code>request and response properties contain
         * the current request and response being processed.
         */
        BEFORE_FILTER_EVENT("beforeFilter"),


        /**
         * The event indicating that the <code>doFilter() method of a
         * Filter has returned.  The <code>filter property contains
         * a reference to the relevant filter instance, and the
         * <code>request and response properties contain
         * the current request and response being processed.
         */
        AFTER_FILTER_EVENT("afterFilter");

        public final String value;
        public final boolean isBefore;

        EventType(String value) {
            this.value = value;
            isBefore = value.startsWith("before");
        }


    }


    // ----------------------------------------------------------- Constructors


    /**
     * Construct a new InstanceEvent with the specified parameters.  This
     * constructor is used for filter lifecycle events.
     *
     * @param wrapper Wrapper managing this servlet instance
     * @param filter Filter instance for which this event occurred
     * @param type Event type (required)
     */
    public InstanceEvent(Wrapper wrapper, Filter filter, EventType type) {

      super(wrapper);
      this.wrapper = wrapper;
      this.filter = filter;
      this.servlet = null;
      this.type = type;

    }


    /**
     * Construct a new InstanceEvent with the specified parameters.  This
     * constructor is used for filter lifecycle events.
     *
     * @param wrapper Wrapper managing this servlet instance
     * @param filter Filter instance for which this event occurred
     * @param type Event type (required)
     * @param exception Exception that occurred
     */
    public InstanceEvent(Wrapper wrapper, Filter filter, EventType type,
                         Throwable exception) {

      super(wrapper);
      this.wrapper = wrapper;
      this.filter = filter;
      this.servlet = null;
      this.type = type;
      this.exception = exception;

    }


    /**
     * Construct a new InstanceEvent with the specified parameters.  This
     * constructor is used for filter processing events.
     *
     * @param wrapper Wrapper managing this servlet instance
     * @param filter Filter instance for which this event occurred
     * @param type Event type (required)
     * @param request Servlet request we are processing
     * @param response Servlet response we are processing
     */
    public InstanceEvent(Wrapper wrapper, Filter filter, EventType type,
                         ServletRequest request, ServletResponse response) {

      super(wrapper);
      this.wrapper = wrapper;
      this.filter = filter;
      this.servlet = null;
      this.type = type;
      this.request = request;
      this.response = response;

    }


    /**
     * Construct a new InstanceEvent with the specified parameters.  This
     * constructor is used for filter processing events.
     *
     * @param wrapper Wrapper managing this servlet instance
     * @param filter Filter instance for which this event occurred
     * @param type Event type (required)
     * @param request Servlet request we are processing
     * @param response Servlet response we are processing
     * @param exception Exception that occurred
     */
    public InstanceEvent(Wrapper wrapper, Filter filter, EventType type,
                         ServletRequest request, ServletResponse response,
                         Throwable exception) {

      super(wrapper);
      this.wrapper = wrapper;
      this.filter = filter;
      this.servlet = null;
      this.type = type;
      this.request = request;
      this.response = response;
      this.exception = exception;

    }


    /**
     * Construct a new InstanceEvent with the specified parameters.  This
     * constructor is used for processing servlet lifecycle events.
     *
     * @param wrapper Wrapper managing this servlet instance
     * @param servlet Servlet instance for which this event occurred
     * @param type Event type (required)
     */
    public InstanceEvent(Wrapper wrapper, Servlet servlet, EventType type) {

      super(wrapper);
      this.wrapper = wrapper;
      this.filter = null;
      this.servlet = servlet;
      this.type = type;

    }


    /**
     * Construct a new InstanceEvent with the specified parameters.  This
     * constructor is used for processing servlet lifecycle events.
     *
     * @param wrapper Wrapper managing this servlet instance
     * @param servlet Servlet instance for which this event occurred
     * @param type Event type (required)
     * @param exception Exception that occurred
     */
    public InstanceEvent(Wrapper wrapper, Servlet servlet, EventType type,
                         Throwable exception) {

      super(wrapper);
      this.wrapper = wrapper;
      this.filter = null;
      this.servlet = servlet;
      this.type = type;
      this.exception = exception;

    }


    /**
     * Construct a new InstanceEvent with the specified parameters.  This
     * constructor is used for processing servlet processing events.
     *
     * @param wrapper Wrapper managing this servlet instance
     * @param servlet Servlet instance for which this event occurred
     * @param type Event type (required)
     * @param request Servlet request we are processing
     * @param response Servlet response we are processing
     */
    public InstanceEvent(Wrapper wrapper, Servlet servlet, EventType type,
                         ServletRequest request, ServletResponse response) {

      super(wrapper);
      this.wrapper = wrapper;
      this.filter = null;
      this.servlet = servlet;
      this.type = type;
      this.request = request;
      this.response = response;

    }


    /**
     * Construct a new InstanceEvent with the specified parameters.  This
     * constructor is used for processing servlet processing events.
     *
     * @param wrapper Wrapper managing this servlet instance
     * @param servlet Servlet instance for which this event occurred
     * @param type Event type (required)
     * @param request Servlet request we are processing
     * @param response Servlet response we are processing
     * @param exception Exception that occurred
     */
    public InstanceEvent(Wrapper wrapper, Servlet servlet, EventType type,
                         ServletRequest request, ServletResponse response,
                         Throwable exception) {

      super(wrapper);
      this.wrapper = wrapper;
      this.filter = null;
      this.servlet = servlet;
      this.type = type;
      this.request = request;
      this.response = response;
      this.exception = exception;

    }


    // ----------------------------------------------------- Instance Variables


    /**
     * The exception that was thrown during the processing being reported
     * by this event (AFTER_INIT_EVENT, AFTER_SERVICE_EVENT, 
     * AFTER_DESTROY_EVENT, AFTER_DISPATCH_EVENT, and AFTER_FILTER_EVENT only).
     */
    private Throwable exception = null;


    /**
     * The Filter instance for which this event occurred (BEFORE_FILTER_EVENT
     * and AFTER_FILTER_EVENT only).
     */
    private Filter filter = null;


    /**
     * The servlet request being processed (BEFORE_FILTER_EVENT,
     * AFTER_FILTER_EVENT, BEFORE_SERVICE_EVENT, and AFTER_SERVICE_EVENT).
     */
    private ServletRequest request = null;


    /**
     * The servlet response being processed (BEFORE_FILTER_EVENT,
     * AFTER_FILTER_EVENT, BEFORE_SERVICE_EVENT, and AFTER_SERVICE_EVENT).
     */
    private ServletResponse response = null;


    /**
     * The Servlet instance for which this event occurred (not present on
     * BEFORE_FILTER_EVENT or AFTER_FILTER_EVENT events).
     */
    private Servlet servlet = null;


    /**
     * The event type this instance represents.
     */
    private EventType type = null;


    /**
     * The Wrapper managing the servlet instance for which this event occurred.
     */
    private Wrapper wrapper = null;


    // ------------------------------------------------------------- Properties


    /**
     * Return the exception that occurred during the processing
     * that was reported by this event.
     */
    public Throwable getException() {

        return (this.exception);

    }


    /**
     * Return the filter instance for which this event occurred.
     */
    public Filter getFilter() {

        return (this.filter);

    }


    /**
     * Return the servlet request for which this event occurred.
     */
    public ServletRequest getRequest() {

        return (this.request);

    }


    /**
     * Return the servlet response for which this event occurred.
     */
    public ServletResponse getResponse() {

        return (this.response);

    }


    /**
     * Return the servlet instance for which this event occurred.
     */
    public Servlet getServlet() {

        return (this.servlet);

    }


    /**
     * Return the event type of this event.
     */
    public EventType getType() {

        return (this.type);

    }


    /**
     * Return the Wrapper managing the servlet instance for which this
     * event occurred.
     */
    public Wrapper getWrapper() {

        return (this.wrapper);

    }


}