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CHAPTER 11 REST-BASED MODEL VIEW CONTROLLER PATTERN
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is not stable and will constantly change because it is based on information from the external network, and hence the Cache Controller pattern cannot be applied. One exception exists if the external request generates information that the Cache Controller pattern can use. However, don t count on it, and expect for the most part to not be able to use the Cache Controller pattern.
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Architecture
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The REST-Based Model View Controller pattern implements several patterns and the Model View Controller architecture. In its simplest form, the pattern is a wrapper to access external content. In its most complex form, it is an application in its own right.
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The Big Picture
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Dissect the Model View Controller aspect of the pattern and you ll see that the model is the external content generated by the various HTTP servers. The controller performs operations on the model and generates a view, but only the view required by the client. The view is an implementation of the Permutations pattern and defines a resource and representation. Figure 11-2 illustrates an example architecture that implements the REST-Based Model View Controller pattern.
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Figure 11-2. Architectural implementation of REST-based Model View Controller pattern
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CHAPTER 11 REST-BASED MODEL VIEW CONTROLLER PATTERN
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In Figure 11-2, the web browser (which will be called the view throughout this chapter) makes a request to the local server (called the controller throughout this chapter). The controller makes a request to the external servers (called the model throughout this chapter) by using a local client. The controller might make a single local client call or multiple local client calls, and it depends entirely on the application. The local client is responsible for receiving the results and converting the received results into a structure that the controller expects. The controller gathers the results, performs some business operations, converts them into a view the client expects, and then finally sends the view to the client. The outcome of this quick overview of the architecture is that the client can call the controller and expect a specific view. The local clients adapt the remote results into local results, creating stability and robustness of the data. The controller can perform optimizations, and if necessary could integrate other sources to enhance the results. The controller could implement the Permutations pattern and the Persistent Communications pattern. The idea is that the controller can act as an aggregator that slices and dices the information retrieved. Architecturally, the various terms are assembled as in Figure 11-3.
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Figure 11-3. Terms assembled into an architecture for REST-Based Model View Controller pattern In Figure 11-3, the client calls the local server, or controller, which calls the Permutations layer, which calls the local client, which calls the remote server. The controller can embed business logic, and more importantly can act as a locally installed application. Think of it this way. A traditional client is installed on the local computer. Thus far, all Ajax applications have been thought of as executing on two separate computers. However, with the REST-Based Model View Controller, the notion of a traditional application can be implemented in that the HTTP server executing the controller is on the same computer as the web browser. The effect is a server application that communicates with other server applications, building a matrix of applications that can seamlessly interact and interchange data. Right now, to have a traditional application communicate with another traditional application is not easy and requires extra steps such as
CHAPTER 11 REST-BASED MODEL VIEW CONTROLLER PATTERN
Copy and Paste. However, with the REST-Based Model View Controller, a document processor could read an e-mail and directly process the data into a document, and vice versa. The concept of location when used with the REST-Based Model View Controller becomes irrelevant because users can access their data from home, from the office, or from anywhere else. Location is irrelevant because it is replaced with a resource. Of course, you might say, But if the resource is located at the URL http://myserver.mydomain.com/resource, the resource is locked to the server myserver.mydomain.com. What you would be missing is that myserver. mydomain.com is a server name, and a resource that is translated by a Domain Name System (DNS)2 into an IP address. It can be pointed out that a DNS server does implement a form of the Permutations pattern. By combining a DNS server with the HTTP server-based Permutations pattern implementation, you can make a URL an abstract resource.
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