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package javax.servlet;

/**
 * Event that gets fired when the asynchronous operation initiated on a 
 * ServletRequest (via a call to {@link ServletRequest#startAsync} or
 * {@link ServletRequest#startAsync(ServletRequest, ServletResponse)})
 * has completed, timed out, or produced an error.
 *
 * @since Servlet 3.0
 */
public class AsyncEvent { 

    private AsyncContext context;
    private ServletRequest request;
    private ServletResponse response;
    private Throwable throwable;


    /**
     * Constructs an AsyncEvent from the given AsyncContext.
     *
     * @param context the AsyncContex to be delivered with this AsyncEvent
     */
    public AsyncEvent(AsyncContext context) {
        this(context, null, null, null);
    }

    /**
     * Constructs an AsyncEvent from the given AsyncContext, ServletRequest,
     * and ServletResponse.
     *
     * @param context the AsyncContex to be delivered with this AsyncEvent
     * @param request the ServletRequest to be delivered with this AsyncEvent
     * @param response the ServletResponse to be delivered with this
     * AsyncEvent
     */
    public AsyncEvent(AsyncContext context, ServletRequest request,
            ServletResponse response) {
        this(context, request, response, null);
    }

    /**
     * Constructs an AsyncEvent from the given AsyncContext and Throwable.
     *
     * @param context the AsyncContex to be delivered with this AsyncEvent
     * @param throwable the Throwable to be delivered with this AsyncEvent
     */
    public AsyncEvent(AsyncContext context, Throwable throwable) {
        this(context, null, null, throwable);
    }

    /**
     * Constructs an AsyncEvent from the given AsyncContext, ServletRequest,
     * ServletResponse, and Throwable.
     *
     * @param context the AsyncContex to be delivered with this AsyncEvent
     * @param request the ServletRequest to be delivered with this AsyncEvent
     * @param response the ServletResponse to be delivered with this
     * AsyncEvent
     * @param throwable the Throwable to be delivered with this AsyncEvent
     */
    public AsyncEvent(AsyncContext context, ServletRequest request,
            ServletResponse response, Throwable throwable) {
        this.context = context;
        this.request = request;
        this.response = response;
        this.throwable = throwable;
    }

    /**
     * Gets the AsyncContext from this AsyncEvent.
     *
     * @return the AsyncContext that was used to initialize this AsyncEvent
     */
    public AsyncContext getAsyncContext() {
        return context;
    }

    /**
     * Gets the ServletRequest from this AsyncEvent.
     *
     * 

If the AsyncListener to which this AsyncEvent is being delivered * was added using {@link AsyncContext#addListener(AsyncListener, * ServletRequest, ServletResponse)}, the returned ServletRequest * will be the same as the one supplied to the above method. * If the AsyncListener was added via * {@link AsyncContext#addListener(AsyncListener)}, this method * must return null. * * @return the ServletRequest that was used to initialize this AsyncEvent, * or null if this AsyncEvent was initialized without any ServletRequest */ public ServletRequest getSuppliedRequest() { return request; } /** * Gets the ServletResponse from this AsyncEvent. * *

If the AsyncListener to which this AsyncEvent is being delivered * was added using {@link AsyncContext#addListener(AsyncListener, * ServletRequest, ServletResponse)}, the returned ServletResponse * will be the same as the one supplied to the above method. * If the AsyncListener was added via * {@link AsyncContext#addListener(AsyncListener)}, this method * must return null. * * @return the ServletResponse that was used to initialize this AsyncEvent, * or null if this AsyncEvent was initialized without any ServletResponse */ public ServletResponse getSuppliedResponse() { return response; } /** * Gets the Throwable from this AsyncEvent. * * @return the Throwable that was used to initialize this AsyncEvent, * or null if this AsyncEvent was initialized without any Throwable */ public Throwable getThrowable() { return throwable; } }





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