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Karl Kildén
Index: trunk/content/openwebbeans-spi.mdtext
===================================================================
--- trunk/content/openwebbeans-spi.mdtext (revision 1530832)
+++ trunk/content/openwebbeans-spi.mdtext (working copy)
@@ -18,5 +18,55 @@
# OpenWebBeans SPI
-Coming soon...
+###What is an SPI?
+> Service Provider Interface (SPI) is an API intended to be implemented
+> or extended by a third party. It can be used to enable framework
+> extension and replaceable components.
+- [wikipedia][1]
+
+
+###How does the SPI functionality work in OpenWebBeans?
+First off reading about [OpenWebBeans Core](openwebbeans-impl.html) will give
you the overall idea. Now as mentioned in that description the SPI is
+simply used to integrate other frameworks with OpenWebBeans. The point of
gravity for Java EE is definitely going
+towards CDI today and the SPI pattern ensures that OpenWebBeans can manage
this handily.
+
+From a more technical standpoint it's nothing more then a bunch of interfaces.
For example a part of the SPI is the following interface:
+
+
+ package org.apache.webbeans.spi;
+
+ /**
+ * Conversation related SPI.
+ * @version $Rev$ $Date$
+ */
+ public interface ConversationService
+ {
+ /**
+ * Gets the current conversation id or null
+ * if there is no conversation.
+ * @return the current conversation id
+ */
+ public String getConversationId();
+
+ /**
+ * Gets the session id of the current session.
+ * @return the session id of the current user session
+ */
+ public String getConversationSessionId();
+
+ }
+
+
+After seeing this interface one can easily conclude that frameworks that want
to utilize the Conversation Id functionality must implement this interface.
+Now since this is part of the specification for JSF 2.x the JSF plugin of
course implements it and actually the JSF 1.2 plugin as well. Supporting the
Conversation Id in another plugin should be rather intuitive and this is true
for the SPI in general.
+
+
+
+
+
+
+
+
+
+ [1]: http://en.wikipedia.org/wiki/Service_provider_interface
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