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CHAPTER 4 CACHE CONTROLLER PATTERN
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function CacheProxy() { } function CacheProxy_get(url) { CacheController.getURL(url, this, false); } function CacheProxy_post(url, mimetype, datalength, data) { var thisreference = this; asynchronous = new Asynchronous(); asynchronous.openCallback = function(xmlhttp) { thisreference.openCallback(xmlhttp); } asynchronous.complete = function(status, statusText, responseText, responseXML) { thisreference.complete(status, statusText, responseText, responseXML); } asynchronous.post(url, mimetype, datalength, data); } CacheProxy.prototype.openCallback = CacheProxy_openCallback; E B V N CacheProxy.prototype.complete = CacheProxy_complete; CacheProxy.prototype.get = CacheProxy_get; CacheProxy.prototype.put = CacheProxy_put; CacheProxy.prototype.del = CacheProxy_delete; CacheProxy.prototype.post = CacheProxy_post; To act as a full proxy for Asynchronous, CacheProxy needs to expose the methods that Asynchronous exposes. This means CacheProxy needs to implement the get, put, del, and other such methods. Implementing a proxy means delegating functionality. In the case of the client calling an HTTP GET, it means the function CacheProxy_get needs to delegate to CacheController. For all of the other functions (for example, CacheProxy_post), CacheProxy delegates to Asynchronous. Doing a full proxy implementation of Asynchronous also requires implementing openCallback and callback, which then delegates to the method CacheProxy.openCallback or CacheProxy. complete that will call the user-defined implementations, if the user defined an implementation.
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Putting It All Together
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When the HTML code is combined with CacheController and CacheProxy, a cache is created that uses HTTP validation. Using the CacheController HTML code is quicker than not using a cache. Multiple instances of CacheProxy instantiate multiple instances of Asynchronous to allow concurrent downloads. Do not confuse multiple instances with multiple threads. When writing web-browser-based JavaScript applications, there is no such thing as threads, because the JavaScript code in the web browser runs within a single thread. The asynchronous downloads might be running on individual threads, but the point is that when using JavaScript it is not possible to create threads nor use any synchronization mechanisms. Having said all that,
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CHAPTER 4 CACHE CONTROLLER PATTERN
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the cache code was written to be as thread-friendly as possible in case an individual web browser decides to optimize the JavaScript code. As a side note, many may comment that threading is possible when using JavaScript timers. Again, timers are not threads, but they allow multiple tasks to be executed. Be forewarned that if your script is executing, there is no way to manipulate to the HTML page because the HTML page will be frozen for the length of the request. The example of freezing the browser was illustrated in 2.
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Implementing the Server Side of the HTTP Validator
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As mentioned in the explanation of the variable CacheController and the type CacheProxy, it is expected that the server send entity tags and perform the heavy work when comparing these tags. When implementing a server-side HTTP validator, that does not mean implementing a cache. The cache is on the client side, the proxy, or somewhere along the chain of Internet infrastructure. Implementing HTTP validation on the server side means processing entity tags only.
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Defining the Book
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Let s begin the book application with the definition of the Book class. The Book class was briefly illustrated in the Architecture section, but the details were not discussed, just the hash code feature. The Book class is relatively undemanding and has only data members. It is important to not have any built-in serialization defined in the class because two persistence techniques E B V N will be used: file system and general storage. If the general storage were a relational database, an object to relational mapper could be used (Hibernate for Java, or NHibernate for .NET). Using Java, the Book class is defined as follows: public class Book { private String _ISBN; private String _author; private String _title; public void setISBN(String iSBN) { _ISBN = iSBN; } public String getISBN() { return _ISBN; } public void setAuthor(String author) { _author = author; } public String getAuthor() { return _author; } public void setTitle(String title) { _title = title; }
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