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Added documentation on RequestCache functionality.

This commit is contained in:
Luke Taylor 2010-05-16 15:18:03 +01:00
parent 978bb9f601
commit e0d06b2b53
2 changed files with 31 additions and 0 deletions
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7
docs/manual/src/docbook/appendix-namespace.xml
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@ -488,6 +488,13 @@
maintained by Spring Security. Full details can be found in the namespace
chapter.</para>
</section>
<section xml:id="nsa-request-cache">
<title>The <literal>request-cache</literal> Element</title>
<para>Sets the <interfacename>RequestCache</interfacename> instance which will be used
by the <classname>ExceptionTranslationFilter</classname> to store request information
before invoking an <interfacename>AuthenticationEntryPoint</interfacename>.
</para>
</section>
</section>
<section>
<title>Authentication Services</title>

24
docs/manual/src/docbook/core-filters.xml
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@ -168,6 +168,30 @@
to configure your application. See <link xlink:href="#nsa-access-denied-handler">the
namespace appendix</link> for more details.</para>
</section>
<section xml:id="request-caching">
<title><interfacename>SavedRequest</interfacename>s and the <interfacename>RequestCache</interfacename> Interface</title>
<para>Another of <classname>ExceptionTranslationFilter</classname>'s responsibilities is
to save the current request before invoking the <interfacename>AuthenticationEntryPoint</interfacename>.
This allows the request to be restored after the use has authenticated (see previous overview
of <link xlink:href="#tech-intro-web-authentication">web authentication</link>).
A typical example would be where the user logs in with a from, and is then redirected to the
original URL by the default <classname>SavedRequestAwareAuthenticationSuccessHandler</classname>
(see <link xlink:href="#form-login-flow-handling">below</link>).
</para>
<para>The <interfacename>RequestCache</interfacename> encapsulates the functionality required for storing
and retrieving <interfacename>HttpServletRequest</interfacename> instances. By default
the <classname>HttpSessionRequestCache</classname> is used, which stores the request
in the <interfacename>HttpSession</interfacename>. The <classname>RequestCacheFilter</classname>
has the job of actually restoring the saved request from the cache when the user is redirected to
the original URL.
</para>
<para>Under normal circumstances, you shouldn't need to modify any of this functionality, but the
saved-request handling is a <quote>best-effort</quote> approach and there may be situations which
the default configuration isn't able to handle. The use of these interfaces makes it fully pluggable
from Spring Security 3.0 onwards.
</para>
</section>
</section>
<section xml:id="security-context-persistence-filter">
<title><classname>SecurityContextPersistenceFilter</classname></title>