Home > HA1 > HA17901P
HA17901P Datasheet | Hitachi Semiconductor
Part No. : HA17901P
Description : Quadruple Comparators
Download : HA17901P Click to Download
Page Number : 16
Manufacturer : Hitachi Semiconductor
File Size : 79 Kb

HA17901P Article About

In Part 1 and Part 2, the establishment of a WeatherDataSource control, which provided for the weather.com XML API to run, use the WebRequest and WebResponse to access the data via HTTP. So far, all are synchronized to access the service. Therefore, the page processing is blocked until the Web request completed. This method is effective for testing the page in small sites may also be effective, but in receiving a lot of traffic on the site will be Waterloo; such as portal page, the weather can be very common in which the module. Introduction in the thread pool has fixed the number of threads can be used to service requests, unfortunately, the solution is not just improve the limit. Thus, when a page is blocked and waiting for another server, it also in the occupation of thread, which may lead to other incoming requests in the queue waiting for a longer time. This will result in slower access to the site, and lower CPU utilization. In Visual Studio 2005, we introduced an asynchronous page, which allows the control to define the tasks they wish to asynchronous, ie, without blocking the thread used to process the request. This will not introduce more information about asynchronous page itself, Dmitry, and Fritz Onion has been described previously. Here is how to introduce controls in the data source using this feature, use the add-in framework to implement asynchronous data source. Background Part 1, alluded to some strange DataSourceView class design: public abstract class DataSourceView {public virtual void Select; protected abstract IEnumerable ExecuteSelect ;...} You will notice that Select method does not actually return to the public any data. It accepts a callback, and through the callback to return data. ExecuteSelect only call to retrieve the protected data-bound control to be returned to the data. DataSourceView default implementation class does not actually do anything asynchronously. The reason is that there are no ready-made asynchronous data source controls. But OM design does allow for asynchronous data access, in this design, the data is available after completion of the asynchronous. Therefore, we have a callback-based model. Those familiar with the framework of the asynchronous API, people will notice the lack of asynchronous mode: public Select, BeginSelect and EndSelect method, in these methods, the data-bound controls to select which method is called. However, the data-bound control can not be sure is to select the synchronization API or choose asynchronous API. In addition, to add data-bound control property is also useless. Data source controls encapsulate information about how to access the data stored for more information on the data storage access is synchronous or asynchronous occurrence occurred should be based on the data source to determine whether or according to semantic-based custom attributes to decide. Potential "bool PerformAsyncDataAccess" attribute for the correct location of the data source control itself. This In the MIDP, there is no concept of files, so the general can only rely on the permanent storage record storage system implementation, introduction of records storage system, you can see the tutorial: http://www-900.ibm.com/developerWorks/cn/java/ j-wi-rms/index.shtml
Microsofts new initiatives in many ways to deal with Netscape in the 1990s used similar methods. Microsofts IE browser at that time will be bundled into the Windows operating systems are to become an integral part of the operating system. In 2000, the U.S. Department of Justice finds that Microsoft has this monopoly. A series of Web services and Microsoft Windows in turn linked together. But this new approach, which is Microsoft calls "software plus services" approach to Microsofts rivals once again raised allegations of unfair competition charges. To address this challenge, Microsoft has been involved in various international service standards on their work, these services from the blog editing, photo sharing tools such as individual users to the network programs such as customer relationship management systems have automated business processes.

All rights reserved:iceach.com © 2000-2010 Certificate No.:Guangdong ICP No.08108781