User Tools

Site Tools


about:navigating_principle_languages

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Last revision Both sides next revision
about:navigating_principle_languages [2013-09-14 18:05]
christian
about:navigating_principle_languages [2013-09-15 22:39]
christian
Line 182: Line 182:
     * The rating of RoE depends on the concrete variant of the pattern. In the DI approach the dependencies are explicitly visible on the interface, which is not the case in the two other approaches. In solution F the dependency is not visible from the interface at all. Same with SL if the service locator is globally accessible. Even if a reference to the service locator is explicitly passed around, it is still not visible which services provided by the locator are used. On the other hand getting a reference is explicit with F and SL. In the DI approach it is only explicit when it is done manually. Typical DI frameworks wire the instances implicitly.     * The rating of RoE depends on the concrete variant of the pattern. In the DI approach the dependencies are explicitly visible on the interface, which is not the case in the two other approaches. In solution F the dependency is not visible from the interface at all. Same with SL if the service locator is globally accessible. Even if a reference to the service locator is explicitly passed around, it is still not visible which services provided by the locator are used. On the other hand getting a reference is explicit with F and SL. In the DI approach it is only explicit when it is done manually. Typical DI frameworks wire the instances implicitly.
   * TdA/IE   * TdA/IE
-    * FIXME+    * DI > FIXME
   * ML   * ML
 +    * F > DI > SL
 +    * In the DI solution a possible fault would be to have different modules reference different instances of the same class where they should rather reference the same instance. In SL solution there is even a more problematic fault which could be introduced. Eventually somebody might get the idea to change the registered instances in the locator at runtime. This would then be the source for some hard to find defects: Some modules will cache the instance they got from the service locator in an attribute and some won't. In such a case the latter will receive the new instance while the former won't.
about/navigating_principle_languages.txt · Last modified: 2013-09-16 17:27 by christian