Labs/Jetpack/JEP/29: Difference between revisions

Labs/Jetpack/JEP/29 (view source)

144 bytes added , 9 October 2009

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 === Dependency Injection ===
-The manifest is essentially used as a high-level specification that guides the injection of dependencies into the Jetpack's global environment.  For instance, if the manifest doesn't specify that the Jetpack needs access to the network, then the <tt>XMLHttpRequest</tt> object won't be inserted into the Jetpack's global scope; if the manifest specifies that the Jetpack only needs to communicate with foo.com, then <tt>XMLHttpRequest</tt> will be attenuated such that connections to domains other than foo.com will fail.
+The manifest is essentially used as a high-level specification that guides the injection of dependencies into the Jetpack's global environment.
+For instance, if the manifest doesn't specify that the Jetpack needs access to the network, then the <tt>XMLHttpRequest</tt> object won't be inserted into the Jetpack's global scope&mdash;or perhaps a "dummy" object that raises a helpful security error when accessed will be injected in its place.
+Alternatively, if the manifest specifies that the Jetpack only needs to communicate with foo.com, then <tt>XMLHttpRequest</tt> will be injected but attenuated such that connections to domains other than foo.com will fail.
 === Extenders ===