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docs(guide/services): explain services in plain language

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See the discussion at http://docs.angularjs.org/guide/dev_guide.services.understanding_services#comment-1002821035

Closes #4055
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anilgulecha 2013-09-19 16:08:31 +05:30 committed by Pete Bacon Darwin
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docs/content/guide/dev_guide.services.understanding_services.ngdoc
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@ -11,6 +11,14 @@ another service) that depends on the service. Angular's dependency injection su
of the rest. The Angular injector subsystem is in charge of service instantiation, resolution of of the rest. The Angular injector subsystem is in charge of service instantiation, resolution of
dependencies, and provision of dependencies to factory functions as requested. dependencies, and provision of dependencies to factory functions as requested.
The purpose of a service factory function is to generate a single object or function that
represents the service to the rest of the application. That object or function will then be
passed as a parameter to any other factory function which specifies a dependency on this service.
Angular factory functions are executed lazily. That is, they are only executed when needed
to satisfy a dependency, and are then executed exactly once for each service. Everything which is
dependent on this service gets a reference to the single instance generated by the service factory.
Angular injects dependencies using "constructor" injection (the service is passed in via a factory Angular injects dependencies using "constructor" injection (the service is passed in via a factory
function). Because JavaScript is a dynamically typed language, Angular's dependency injection function). Because JavaScript is a dynamically typed language, Angular's dependency injection
subsystem cannot use static types to identify service dependencies. For this reason a dependent subsystem cannot use static types to identify service dependencies. For this reason a dependent
@ -22,7 +30,6 @@ The Angular web framework provides a set of services for common operations. Like
variables and identifiers, the built-in services always start with `$` (such as `$http` mentioned variables and identifiers, the built-in services always start with `$` (such as `$http` mentioned
above). You can also create your own custom services. above). You can also create your own custom services.
## Related Topics ## Related Topics
* {@link di About Angular Dependency Injection} * {@link di About Angular Dependency Injection}