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otm:ordering_of_messages:fifo [2011/06/27 05:21] aspectscript |
otm:ordering_of_messages:fifo [2011/06/27 05:25] aspectscript |
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| + | ====== The FIFO strategy ====== | ||
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| A mashup application is created from the combination of information retrieved from different servers, //e.g.// Housing Maps. Programmers have to overcome the issue of creating an incorrect Web page due to an arbitrary (and unexpected) order of server responses. For instance, consider a Web page that is created with two Ajax requests. If the second server response is processed before the first server response, the Web page is created incorrectly. A **FIFO** strategy, which processes the server responses in the same order as the Ajax requests are sent, ensures that the Web page is always created correctly. | A mashup application is created from the combination of information retrieved from different servers, //e.g.// Housing Maps. Programmers have to overcome the issue of creating an incorrect Web page due to an arbitrary (and unexpected) order of server responses. For instance, consider a Web page that is created with two Ajax requests. If the second server response is processed before the first server response, the Web page is created incorrectly. A **FIFO** strategy, which processes the server responses in the same order as the Ajax requests are sent, ensures that the Web page is always created correctly. | ||
| Line 11: | Line 13: | ||
| </ | </ | ||
| - | The Fifo strategy is implemented as a TM advice, which is a JavaScript function, that is executed every time a response is retrieved: | + | The FIFO strategy is implemented as a piece of advice, which is a JavaScript function, that is executed every time a server |
| <code javascript> | <code javascript> | ||
| Line 20: | Line 22: | ||
| } | } | ||
| else{ | else{ | ||
| - | jp.proceed ( ) ; | + | jp.proceed() ; |
| this.idServerRespExpected = request.idServerResp + 1; | this.idServerRespExpected = request.idServerResp + 1; | ||
| // executing jp proceeds that can be executed now | // executing jp proceeds that can be executed now | ||
| Line 28: | Line 30: | ||
| </ | </ | ||
| - | Go back the [[otm/ | + | Go back the [[otm/ |