psdi.webclient.system.session

Class AsyncRequestManager

java.lang.Object

psdi.webclient.system.session.AsyncRequestManager

public class AsyncRequestManager
extends java.lang.Object

The class used by the Tpae UI framework to manage HttpServletRequest asynchronously

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	DUP_SEQ_NUM
static java.lang.String	PAGE_SEQ_NUM
static java.lang.String	XHR_SEQ_NUM

Method Summary

Methods

Modifier and Type	Method and Description
long	getLastRequestSeqNumHandled()
long	getNextPageRenderSeqNumber() THIS METHOD SHOULD ONLY BE CALLED BY the PageInstance render method when the page is performing a complete render (or rerender) of the main application page.
void	manageRequest(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Looks at the passed in request, determines if it's a synchronous or high/low priority asynchronous request by looking at the requesttype parameter.
void	resetRequestSequenceNumber() Resets the xhr request sequence number back to 1 so the next request to be handled by this this class should have the xhr-seq-num header value of 1.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

XHR_SEQ_NUM

public static final java.lang.String XHR_SEQ_NUM

See Also:

Constant Field Values

PAGE_SEQ_NUM

public static final java.lang.String PAGE_SEQ_NUM

See Also:

Constant Field Values

DUP_SEQ_NUM

public static final java.lang.String DUP_SEQ_NUM

See Also:

Constant Field Values

Method Detail

manageRequest

public void manageRequest(javax.servlet.http.HttpServletRequest request,
                 javax.servlet.http.HttpServletResponse response)
                   throws javax.servlet.ServletException,
                          java.io.IOException

Looks at the passed in request, determines if it's a synchronous or high/low priority asynchronous request by looking at the requesttype parameter.

The four request types are:

sync - The request is synchronous and no other requests (for that particular WebClientSession) will be permitted until the complete request is handled. Basically the request works as it does today. This type is also the default so it the parameter doesn't exist or is blank the request will be treated as synchronous .
async - The request is a normal (or low priority) asynchronous request that will allow other requests to be "queued". There will be a configurable "delayed page render" after so many queued requests have been handled. There will also be a configurable time limit that will allow the page render if a render hasn't been sent within the specified time.
highasync - A high priority (hp) request that will be handled before all other low/normal priority requests that are queued. There will be a queue of hp requests and they will be handled FIFO order. Hp requests will be sent directly to a component or control and expects the component/control to render the response itself within the call to the component/control. There will not be a complete ui render.
norender - A low priority request that will be handled directly by the component/control but no UI render will be called. Basically work the same as the highasync but a low priority and no response data is expected.

If the requesttype parameter is null, deoesn't have a value or one of the types listed above the request will be considered a synchronous event.

Parameters:

request - HttpServletRequest object sent to the Tpae UI framework (via the WebClientServlet) from the client (browser).

response - HttpServletResponse object that contains the response the Tpae UI framework returns to the client

Throws:

java.io.IOException - passing the IOException thrown from the eventual call to handleRequest on WebClientSession. Expecting the calling routine to handle the exception.

javax.servlet.ServletException - passing the ServletException thrown from the eventual call to handleRequest on WebClientSession. Expecting the calling routine to handle the exception.

resetRequestSequenceNumber

public void resetRequestSequenceNumber()

Resets the xhr request sequence number back to 1 so the next request to be handled by this this class should have the xhr-seq-num header value of 1.

getNextPageRenderSeqNumber

public long getNextPageRenderSeqNumber()

THIS METHOD SHOULD ONLY BE CALLED BY the PageInstance render method when the page is performing a complete render (or rerender) of the main application page. This method returns the value for the render-seq-num request header placed byt he XHR requests sent by the client (browser). This sequence number is used by the framework are maintain proper order of requests sent by the browser. Every time this method is called the sequence number is incremented by one. To obtain what the current sequence number is, call getCurrentPageRenderSeqNumber().

Returns:

The next render sequence number to be used by the main application page.

getLastRequestSeqNumHandled

public long getLastRequestSeqNumHandled()

Returns:

the lastRequestSeqNumHandled