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CHAPTER 9 STATE NAVIGATION PATTERN
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Figure 9-11. Final solution used to uniquely identify the HTML windows, URL, and associated state In Figure 9-11, each browser window instance is unique and can be identified. For example, if the user requests /resource, the window identifier is A, and the state identifier is 11. If the user processes the data, /resource2 is retrieved with a new state identifier 12 and window instance A. If the user were to copy the URL to a new browser instance, the URL /resource2#12 would be copied. The state identifier 12 would be loaded, but the window browser instance is B, and therefore the server knows a new window instance has been created, and a new history is being generated. The server will then associate the state 11 with the newly created state identifier 13. Now both browser instances, A and B, both share the state identifier 11 in their history. Then if the user clicks the Submit Query button of either window, A or B, two unique results will occur that do not conflict with each other. If the example were a plane ticket application, two tickets that start at the same location but end in different locations could be purchased. A new state identifier is created when the page is refreshed. Considering that we can identify the browser instance by using the window name, the state identifier is not necessary. Using a window name as a state identifier creates a state that is accumulated and organized by resource. When a new browser instance and old URL are copied (for example, state identifier 13), the server is responsible for copying the old state into a new state. The downside of using an accumulated state is that it is not as fine-grained as a state identified by unique identifiers.
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CHAPTER 9 STATE NAVIGATION PATTERN
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Managing State at the Protocol Level
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Moving down one level on the technological scale, this section illustrates the HTTP communications between the client and server. The communications are started by having a web browser ask for the resource http://mydomain.com/ajax/chap07/page1, which is illustrated by the following request. Note that the illustrated requests and responses are abbreviated and show only the HTTP information that is relevant for the discussion: GET /ajax/chap07/page1 HTTP/1.1 Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9, text/plain;q=0.8,image/png,*/*;q=0.5 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 The server accepts the request and responds with the following: HTTP/1.1 200 OK ETag: W/"1017-1126885576349" Last-Modified: Fri, 16 Sep 2005 15:46:16 GMT Content-Type: text/html Content-Length: 1017 Server: Apache-Coyote/1.1
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In the response, there is an ETag indicating that the content could be cached by the web browser. If the ETag were sent in response to an XMLHttpRequest request, the Cache Controller pattern could have been used. The server-generated response uses the Permutations pattern and contains information that can be represented by a web browser. The generated response represents the empty or generic representation that does not contain a state. When the generated content has been converted into a processed HTML page, the HTML body onload event is triggered. Triggering the onload event generates a request for the state associated with the resource. Following is the XMLHttpRequest-generated request: GET /ajax/chap07/page1/state HTTP/1.1 Accept: application/xml Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 X-Page-Window-Name: window-2005-10-03-10-10-10-1245 X-Page-State: none What is unique in the request for the state from the XMLHttpRequest object is that the URL is similar in structure to the resource URL, except that the state keyword is appended to the URL. The state keyword is necessary so that all proxies and browsers can uniquely identify the resource and the state associated with the resource. Using the same URL would cause problems. In the HTTP request, the additional HTTP headers X-Page-State and X-Page-Window-Name are used. The header X-Page-State defines the state identifier, and the header X-Page-Window-Name identifies the name of the window asking for the state. What triggers the server-side State Navigation pattern implementation is either the appended state identifier or the X-Page-State HTTP header. More about the trigger will be discussed in the server-side code implementation.
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