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GWT usually makes your application perform better, but there is one area in which it can actually make performance worse: caching Whenever your browser requests data (such as a page) from a server, it first looks into its own cache, to check whether it already has the data If the required results are found in memory, the browser will forego calling the server and just provide the data from the cache (Of course, several conditions must be fulfilled before something is kept in the cache, but that s not relevant here) The problem here is that whenever GWT calls a remote servlet, it implements the RPC by means of a noncacheable Ajax call, so even if your program asks for the same data over and over again, the browser won t store it in its cache and will require it anew from the server every time If your application requires the same (constant) data that it has already received earlier, you could enhance performance by setting up a local cache of your own, bypassing the browser s one The pattern of usage would require, before calling the server, to check if the asked-for data is already in the cache, and if so, just skip the call There are two points to consider: Never use a cache for information that changes often If you are using a cache for information that can go stale over time, consider using a timestamp so that you ll avoid using old data1

Where ${0} is a token that can be replaced with the specific field name when appropriateThis allows the page to display specific error messages that can be very helpful to the user, while at the same time minimizing the amount of space taken up by JavaScript codeThe 0 in the token represents the first parameter that can be substituted into the message Additional tokens could be used to allow more parameters to be substituted into the message

public void GetContext(out Guid outerContext, out Guid innerContext) { // Use the COM object ICOMDemo innerObject = new COMDemoClass(); innerContext = innerObjectGetContextID(); SystemRuntimeInteropServicesMarshalReleaseComObject( innerObject); // Access the context id outerContext = ContextUtilContextId; }

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You can register a NET serviced component with the COM+ runtime with the utility regsvcsexe You cannot use this utility with COM DLLs, for which automatic deployment is also impossible You can register COM DLLs by using drag and drop and selecting the COM DLL and then dropping it into an application in the tool Component Services Explorer Instead of using drag and drop, you can also install the component by selecting Components in the tree view and by choosing the Action, New Component This option starts a wizard for installing the component Just click the button Install New Component(s) and select the COM DLL afterward Contrary to NET, by default COM components have the activation setting Component Supports Event and Statistics selected You have to deselect this option to allow the COM and NET components to run within the same context

Class_with_cache: 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 On callback: Put the data in the cache, and return it

File '${0}' is not found in directory '${1}'

The client application is a simple console application that creates a new instance of the NET serviced component ContextDemo to invoke the method GetContext, as shown with Listing 4-15 The returned context identifiers are written to the console

In this case, ${0} would be replaced with a file name, and ${1} would be replaced with the name of a directory

Let s illustrate this pattern with our CountryState object, which we used in our cities browsing form in 6 The simplest application of this pattern has to do with the countryCode ListBox In this case, we can make do with a static object in which to store the received country list; whenever we ask for the countries list, we first check if the list is already loaded, and if so, we just return it Changes in the Model class code are minimal with regard to the code we saw earlier in the book (In 6 we had mentioned that it would be better if no other part of the application knew the actual

static void Main(string[] args)

File 'Georgejpg' is not found in directory 'c:\Pictures'

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