DARC: Dagger and Request Context (for Dropwizard)

If I'm building a Dropwizard application, how do I inject HttpHeaders using Dagger?

1. Inject ResourceContext into your class.
2. Call the httpHeaders() method of the ResourceContext object.
3. Add RequestContextModule to your Dagger component.
   • This Dagger module only depends on the Dropwizard Environment.

If you want a code example, see ExampleResource and ExampleApp.

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ResourceContext contains:

• HttpHeaders
• UriInfo
• SecurityContext
• Request
• HttpServletRequest
• HttpServletResponse

Limitation

This context is thread-local; it is only accessible from the thread that handles the request. (The same limitation would apply if you used HK2 to inject Provider<HttpHeaders> into a class.)