Fix Jee6 Asynchronous Servlet Example

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Web containers on form servers typically use a server stream depending on the client’s request. Under high load conditions, gatekeepers require a large number of threads directly to satisfy all client requests. Scalability includes constraints that either exhaust memory or overload the container’s thread pool. To build scalable web applications, you must ensure that no thread associated with the request is always idle so that the container can use them to handle new requests.

There are four common scenarios in which the thread associated with a request can be idle.

• 

  The thread must wait for a resource to become available or data to be processed before generating a response now. For example, the application form may require a database; H. Request access data from the online world of the remote service before a response is generated.

• The thread should help to wait for the event before taking any action. For example, an application might be designed to begiving a JMS message, information from another user or client, new computer files available in the queue before generating a response.

they are blocking operations that limit the scalability of web applications. Asynchronous discovery refers to assigning these blocking operations as a new thread and carefully adjusting the associated thread with the request directly in the container.

17.12.1 Asynchronous Servlet Processing

Java EE creates servlets to support asynchronous processing of air filters. If a servlet or filter detects a potentially blocking operation while processing a new request, it can affect the operation when you want to asynchronize the execution context and immediately return the current thread associated with the request, which is the container. Without creating a response, you can Send. The blocking process ends in the context of asynchronous inclusion in a thread, which often generates a response or forwards a request to another servlet.

To enable asynchronous servlet processing Again, set the asyncSupported parameter to true for the @WebServlet annotation as follows:

 @ WebServlet (urlPatterns = "/ asyncservlet", asyncSupported = true)public class AsyncServlet extends HttpServlet ...

The javax.servlet.AsyncContext class provides the results needed to handle the asynchronous internal methods of a service. To get a snapshot of AsyncContext , call the startAsync () method located in the request object of your resolve method; for example:

 public void doGet (HttpServletRequest or HttpServletResponse req or)   ...   AsyncContext acontext = req.startAsync ();   ...

This ring puts the request in an asynchronous structure and ensures that the response is not considered acknowledged after the method service ends. You must generate the response in the appropriate asynchronous context after completing the block operation, or send the request to another servlet.

Table 17-3 describes the basic functionality provided by the AsyncContext class.

Method Signature	Description
Invalid execution)	The container provides an exclusive thread on which the blocking operation is handled. They provide the code to block the action as a class that implements the executable interface. You can provide this type as an inner class when you call our start method, or you can use some other mechanism to make sure you pass the AsyncContext to your personal class.
ServletRequest getRequest ()	Returns the actually used initialization request for this asynchronous context. In the above human example, the request corresponds to a service method. You can use this method in an asynchronous context when you need to get request parameters.
ServletResponse getResponse ()	Returns a response used for initialization to help you in this asynchronous context. In the above example, the answer is the same as in the entire method service. This scheme can be used in an asynchronous context to write a response with the results of the current block operation.
Cancel completed ()	Complete the specified asynchronous operation and asynchronously close the corresponding response with this context. You call this workaround after writing a response object that is in an asynchronous context.
Invalid path)	Sends request and response objects along the specified path. You use this method to have another servlet write back after the blocking process completes.

17.12.2 Waiting For Resource

This section shows how the provided functions are used at the rate of AsyncContext for the following use case:

1. The servlet becomes a parameter of the GET request.

2. The servlet uses a resource, such as a storage system or a web service, to receive offers based on the value of this parameter. The resource might slow down on retry, so it might be a reject operation.

3. The servlet generates a using response, resource root.

The following code shows a completely new base servlet that does not implement asynchronous processing:

 @ WebServlet (urlPatterns = "/ syncservlet")Public class SyncServlet extends HttpServlet   private resource MyRemoteResource;   @ Crush   public void init (ServletConfig config) alternatively = MyRemoteResource.create ("config1 = x, config2 = y");      @ Crush   public void doGet (HttpServletRequest question,                     HttpServletResponse)      response.setContentType ("text / html; character set = UTF-8");      String param = request.getParameter ("param");      String = result resource.process (parameter); ... ... ... ... ... ... ... ... ./* .... Answer List ... * /   

 @ WebServlet (urlPatterns = "/ asyncservlet", asyncSupported = true)extended public class asyncservlet HttpServlet {   / * ... Similar variables and initialization method as in SyncServlet ... * /   @ Crush   Criminal court invalid doGet (HttpServletRequest,                     HttpServletResponse){      response.setContentType ("text / html; character set = UTF-8");      The last AsyncContext is request.startAsync ();      acontext.start (new Runnable ())         public inactive ()            String param means acontext.getRequest (). GetParameter ("param");            End string product = resource.process (param);            Response HttpServletResponse = acontext.getResponse ();            / * ... print a specific response ... * /            acontext.complete ();   

AsyncServlet adds asyncSupported = true to the @webservlet comment. The rest are contrasts in the service method.

• request.startAsync () causes the collection to be processed asynchronously; the response can be described as not being sent to the client at the new end of the service method.

• acontext.start (new Runnable () ... Gets) new stream container.Code

• Inside the exact method of the inner class, run () runs in a single thread. The inner class has access to this particular asynchronous context in order to normally read the request parameters and write them to the response. The caller of an asynchronous situation complete () checks the response and sends it to you as a client.

Service method AsyncServlet performs delivery immediatelylonely, and the request is sorted in an asynchronous context.

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