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This chapter focused on a new way of building Web applications using SOA. You looked at an example application and learned how to shift into the new architecture based on Ajax and Web services. In your Web application development efforts, keep the following points in mind: Don t try to do everything at once. This recipe showed an approach where you continue using the old database and old data, and incrementally build a new architecture using abstraction and modularization. The aim of this recipe is to help you modularize and granularize your Web applications so that there is a client developer, server developer, and database developer. This is not to say you need three developers but when each developer implements a contract, he or she only needs to worry about the contract and not the other pieces. Ideally, all the pieces will be assembled like a jigsaw puzzle. The server will expose itself as a general Web service adhering to a standard. The standard might be an already developed standard or a standard created within a closed circle. The idea behind developing a standard is to permit the creation of tests that can be used to verify that everything functions correctly. When using a SQL relational database, you should at all times attempt to stick to the SQL standard so that it is possible to move the data from one database to another. One of the main reasons for keeping the old architecture side by side with the new is to make it possible to not have to implement all functionality right away. In the example of the blog software, you do not have to implement the functionality to add entries; you can continue using the old software. This allows you to bring your software to market quickly. You can develop your Web service using standards like SOAP/WSDL, but the example demonstrated the use of REST. REST treats the server-side data as resources that can be manipulated using HTTP verbs (GET, PUT, POST, and DELETE). Think of REST and the HTTP verbs like a SQL database and the manipulation of the data. Remember the purpose of each HTTP verb, so you don t confuse the end user of your REST Web service. REST can expose URLs that fit into the following categories: view URLs, root URLs, collection URLs, and data-resource URLs. Make sure in your architecture to clearly define the purpose of each URL and what HTTP verbs it will accept. Failing to do so will confuse the end user of your REST-based Web service.
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CHAPTER 4 4-1. IMPLEMENTING AN SOA ARCHITECTURE
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The Ajax SOA-based client has two distinct phases. The first phase is loading the document. When loading the document, the client is being initialized. During initialization, the client is preparing the code to be executed. The second phase is executing the document, which means the loading and processing of data that is loaded, using Ajax techniques to call a Web service. This separation of loading and execution is very similar to the loading and execution of a traditional program. When using XMLHttpRequest, remember to use it for the most part in asynchronous mode. You do not want to lock your browser while waiting for content. Note, however, that asynchronous mode means writing more checking code, as you do not want the client to start clicking buttons while waiting for a request to complete. The implementation of the Asynchronous and Synchronous classes illustrates the use of mixins to create similar types that have some specialized functionalities. Additionally, the Asynchronous and Synchronous classes show how to implement contracts in JavaScript. You will want to implement a global error handler in your Ajax application so that any errors that may happen will be displayed in a user-friendly manner. Failing to do so might cause the client to click buttons wildly, and the subsequent reloading of pages will cause even more errors to occur. When you are processing an XML data stream, take a look at the XML DOM methods to help you pick apart the data. You should not need to iterate each individual node, as XML DOM has great facilities to filter nodes. The overall message to take away from this recipe is that by using the approach outlined here, you are moving back to a traditional form of developing client/server applications. The difference is that you are using open standards, which makes it easier to modularize your applications. By using open standards, you make it easier to deploy your application worldwide and easier for third parties to interact with you. In general, this approach to building Web applications is a win-win-win scenario.
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