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The essence of the Cache Controller pattern is the Proxy pattern. The Cache Controller pattern is a proxy to Asynchronous and implements the interface exposed by Asynchronous. The implementation of the Proxy pattern for the Cache Controller pattern is the implementation of a caching strategy. The focus of this section will be the definition and explanation of that caching strategy. There are two ways to implement caching: let the Internet infrastructure do as much as possible for you, or write code to help the Internet infrastructure do its work. As much as I find writing a caching algorithm interesting and fun, doing so would be a waste of time. Doing your own caching is hard because so many elements in the HTTP request chain are already caching data that you have a good chance of re-caching already cached data. By caching yet again, you are providing no added value.
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HTML and HTTP Cache Directives
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Letting the Internet infrastructure manage the caching is called using the HTTP Expiration model. There are two ways to control the caching by using the Internet infrastructure: adding HTML tags or adding HTTP identifiers. When you want to use HTML tags to control the cache, the following HTML uses the necessary HTML tags:
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CHAPTER 4 CACHE CONTROLLER PATTERN
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<html> <head> <title>Hanging Page</title> <meta http-equiv="Cache-Control" content="max-age=3600"> <meta http-equiv="Expires" content="Tue, 01 Jan 1980 1:00:00 GMT"> </head> <body> ... The HTML tag meta has two attributes, http-equiv and content, that are used to mimic HTTP identifiers. The problem with using HTML meta tags is that they are intended to be consumed by a web browser. It is not possible to add the meta tag to an XML data stream. Therefore, it is not possible to use HTML-based cache control tags when streaming data other than HTML. The second way to control caching by using the Internet infrastructure is to generate a set of HTTP tags, as illustrated by the following HTTP request result: HTTP/1.1 200 OK Cache-Control: Public, max-age=3600 Expires: Wed, 10 Aug 2005 10:35:37 GMT Content-Type: text/html;charset=ISO-8859-1 Content-Length: 39 Date: Wed, 10 Aug 2005 09:35:37 GMT E B V N Server: Apache-Coyote/1.1 <html><body>Hello world</body></html> The HTTP identifiers Cache-Control and Expires manage how the page is supposed to be cached. The Cache-Control identifier specifies a caching of the content for 3600 seconds, or one hour. The Expires identifier defines when the retrieved content is considered expired. Both identifiers make it possible for proxies or browsers to cache the HTTP-retrieved content by using the HTTP Expiration model. When used in the context of a script, the HTTP identifiers can be programmatically generated by using the following ASP.NET code: <%@ Page Language = "C#" %> <%@ Import Namespace="System" %> <% Response.Cache.SetExpires(DateTime.Now.AddMinutes( 60 ) ) ; Response.Cache.SetCacheability(HttpCacheability.Public) ; %> <html> <head> <title>Cached Page</title> </head> <body> Hello world! </body> </html>
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CHAPTER 4 CACHE CONTROLLER PATTERN
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Using .NET, the methods SetExpires and SetCacheability will add the Expires and Cache-Control identifiers. To achieve the same effect by using a Java servlet, you would use the following code: import import import import javax.servlet.http.*; javax.servlet.*; java.io.*; java.util.*;
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public class GenerateHeader extends HttpServlet { protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.addHeader("Cache-Control", "Public, max-age=3600"); resp.addHeader("Expires", "Fri, 30 Oct 2006 14:19:41 GMT"); resp.setContentType("text/html"); PrintWriter out = resp.getWriter(); out.println("<html><body>Hello world</body></html>"); } }
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HTTP Expiration Caching Is a Bad Idea (Generally)
E B V N managing caching by writing code to help the Internet infrastructure do its work. The second
It is generally not a good idea to use the HTTP Expiration model, but to use the second way of way is called the HTTP Validation model. To understand why the HTTP Expiration model is problematic, consider the following scenario. You are running a website hosting news. So that there is less traffic on the website, you enable HTTP caching and assign an expiry of 30 minutes. (The expiry time is an arbitrary value used for illustrative purposes.) This means that when a browser downloads some content, the next version of the content will be available in 30 minutes. Indicating a wait period of 30 minutes is a bad idea because in that 30 minutes news can dramatically change. A client who has downloaded some content is then restricted to retrieving news in 30-minute cycles. Of course the client could ignore or empty the cache, resulting in downloads of the latest information. If the client always empties the cache, the client will always get the latest news, but at a cost of downloading content that may not have changed. The resource cost should not surprise anyone because always getting the latest content means using no caching whatsoever. Scripts such as Java servlets/JSP or ASP.NET pages very often use this strategy, and the administrator managing the website wonders why there are performance problems.
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