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CHAPTER 8 PERSISTENT COMMUNICATIONS PATTERN
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String cookieIdentifier = "VersionId" + userstate.getUserIdentifier(); response.addCookie( new Cookie(cookieIdentifier, new Integer( userstate.getVersion()).toString())); return; } try { Thread.sleep(1000); } catch (InterruptedException e) { } waitCount ++; } } response.setStatus(408, "No change"); } else { response.setStatus(500, "Could not find user state"); } } In the doGet method implementation, there are several new aspects. Because any request that reaches doGet or doPost has a user identifier associated with it, extracting the user identifier from the URL is necessary. The user identifier cannot be associated with the user authentication information at the doGet or doPost stage because the user identifier represents a unique identifier. The user authentication at the doGet or doPost stage might be same as is the case if an administrator is verifying some specific URLs. After having extracted the user information from the URL, the method getUser is called to retrieve the state of the user. In the example, that means iterating the _users array list. However, in your application that might mean loading the user state from a database or a file. The key point to notice is that there is a separate function to handle loading the user state. Going back to the implementation of doGet, after the user state has been retrieved, the cookie is retrieved from the URL. It is important to realize that there is not a single cookie, but a cookie for each user. This is important because if you are an administrator watching multiple users, those users need multiple version numbers. The simplest way to do this is to create a cookie identifier for each user. Or more generally, create a cookie version identifier for each specific URL. Another approach is to create an encoded cookie that identifies the version of each specific URL, but the exact specifics are an implementation detail. The important bit is that it is not possible to use a single version number to track all specific URLs. Having retrieved the user state and version number, and identified that the client does not have the latest version of the state, a response can be generated. Take a moment to look at this example and consider the individual pieces because it represents a full implementation of the Persistent Communications pattern. Notice how little we edited the ClientCommunicator piece. This is because the ClientCommunicator needs a full implementation from the first example. The ClientCommunicator is not aware of whether the accessed resource is global anonymous, global authenticated, or unique. The client knows only that there is some information it is interested in.
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CHAPTER 8 PERSISTENT COMMUNICATIONS PATTERN
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The version number is not a common programming concept. Generally speaking, we don t track whether data changes. Yet we should because it is a great way to manage changes. For example, Subversion, which is a great version control system, uses version numbers. Many software programs use build numbers that represent changes in the software. It really begs the question, why not state Ajax applications are based on data that has a specific state, and therefore it is a good idea to associate version numbers. Imagine the extended abilities of web applications. For example, say that while you are booking a flight, you try out various permutations and get various results. After seven permutations, your brain begins to fry. It would be fantastic to be able to go back to a state of the web application that represents an earlier request. Current web applications are simply not cut out for that job. Version numbers in the context of Ajax applications could be defined as their own pattern. But it was decided to not create a specific pattern because the Persistent Communications pattern requires version numbers. Therefore, it was decided that version numbers are an implementation detail, albeit a pretty darn crucial implementation detail.
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