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Whenever your client-side application is going to need lots of data from the server, you ll have to implement some kind of chunking or paging, and that means the user will have to wait for each new batch of data If you could foretell which data a user was going to require, you could use Ajax mechanisms and get ahead of the game, getting the data from the server before actually required, and thus providing a much more responsive interface Of course, you cannot always guess what the user will finally ask for, so you must take into account the possibility that you ll guess wrongly and get some unneeded data; that is a certain risk that you must balance with the sure delays that the user will have to endure if you opt to not prefetch Prefetching just means trying to anticipate your user needs and call for data before the user actually requires it However, you must be careful with this pattern: If you just go overboard by prefetching everything in sight, you ll just make things worse! Since the times of limited-speed, dial-up modems, all browsers have limited the maximum allowed number of client-to-server connections (As a matter of fact, that limitation even got included as part of the HTTP version 11 standard, which reads A single-user client SHOULD NOT maintain more than 2 connections with any server or proxy ) If you make

The value for errorMessage is "Credit Limit must be less than $100000"

You can create an installation program for the client that includes the application proxy, and the target system can be configured with a proxy installation package With the installation of the client proxy, the server name will be registered on the client, so that the client will connect to this server using the DCOM protocol If you are going to create application proxies from a different system than the one intended to be the real server for

several requests for data to your server, you should assume that at most only two of them will go out (in parallel) while the rest will be queued for even longer-than-usual delays3 The simplest pattern for prefetching is as follows:

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JavaScript allows us to manipulate strings of generic text, but it also provides for a special type of text string called JSON, which is an acronym for JavaScript Object Notation Now wasn t that helpful No We ll let s describe it another way JSON is a technique for

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the client, you can change the name of the system that will be configured with the client in the Component Services Explorer by selecting [8] Options with the properties of My Computer If you enter a name in the field Application Proxy RSN, this name is used as the name of the server Figure 5-3 shows this field

representing JavaScript objects as text strings After we convert a JavaScript object to text, we can transfer that text around the Internet using HTTP, which only allows plain text to be transmitted In general, we ll use JSON to transfer objects back and forth between the browser to the server Another use for JSON is to create JavaScript objects using a more concise format than we get using methods calls Let s see an exampleWe ll create two objects using both JavaScript and JSON First we ll view the code for creating an object using JavaScript and the standard Object Oriented technique

Class_with_cache_and_prefetching: Define class attributes for the cache Set the cache to empty initially Whenever data are required: Check if the asked for data are already in the cache If so, Get the data from the cache, and return it Otherwise, Use RPC, Ajax, or whatever, to get the data and also to prefetch extra data On callback: Store the data in the cache If data were needed (as opposed to prefetched) Return it

If you do not set the correct server when creating the application proxy, you can also change the server name in the configuration on the client, which is shown later in this chapter You can create the installation package for a client proxy by selecting the Enterprise Services application in the tree view and then choosing Action, Export This menu starts up the Application Export Wizard shown in Figure 5-4

// create a new object using JavaScript command object1 = new Object(); object1id = 100; object1name = "ABC Customer";

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