61 lines
2.0 KiB
Racket
61 lines
2.0 KiB
Racket
#lang scribble/doc
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@(require "web-server.rkt")
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@title[#:tag "servlet"]{Stateful Servlets}
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@defmodule[web-server/servlet]
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@section[#:style 'hidden #:tag "servlet-example"]{Example}
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A stateful servlet should @racket[provide] the following exports:
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@(require (for-label web-server/http
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(except-in web-server/managers/manager manager)
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"dummy-v2-servlet.rkt")) @; to give a binding context
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@declare-exporting[#:use-sources (web-server/scribblings/dummy-v2-servlet)]
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@defthing[interface-version (one-of/c 'v2)]{
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This indicates that the servlet is a version two servlet.
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}
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@defthing[manager manager?]{
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The @tech{manager} for the continuations of this servlet. See @secref["managers"] for options.
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}
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@defproc[(start [initial-request request?])
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can-be-response?]{
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This function is called when an instance of this servlet is started.
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The argument is the HTTP request that initiated the instance.
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}
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An example version 2 module:
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@(require (for-label web-server/managers/none))
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@racketmod[
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racket
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(require web-server/http
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web-server/managers/none)
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(provide interface-version manager start)
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(define interface-version 'v2)
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(define manager
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(create-none-manager
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(lambda (req)
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(response/xexpr
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`(html (head (title "No Continuations Here!"))
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(body (h1 "No Continuations Here!")))))))
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(define (start req)
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(response/xexpr
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`(html (head (title "Hello World!"))
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(body (h1 "Hi Mom!")))))
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]
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These servlets have an extensive API available to them: @racketmodname[net/url], @racketmodname[web-server/http],
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@racketmodname[web-server/http/bindings], @racketmodname[web-server/servlet/servlet-structs], @racketmodname[web-server/servlet/web],
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@racketmodname[web-server/servlet/web-cells], and @racketmodname[web-server/dispatch].
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Some of these are documented in the subsections that follow.
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@include-section["contracts.scrbl"]
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@include-section["web.scrbl"]
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@include-section["web-cells.scrbl"]
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@include-section["managers.scrbl"]
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