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The processing of the HTTP headers cross-references the authorization information with some local information The local information represents the user identity as defined by the server and could be stored in a database, a Lightweight Directory Access Protocol (LDAP) server, or some other repository In the example, the variable identifier represents the local information, but the local information does not need to be a single variable, and it could be a structure, class, or some other hierarchy The form of the local information really depends on the server implementation and nature of the web application What this results in is a modified version of IUserIdentification, and the factory Create methods If your local application has a class to represent the local information, the Create method with a parameter would be modified to pass in a class instead of a simple string buffer.

With LCDS, the deployment is no different. The WAR file in LCDS has a different name lcds.war as opposed to blazeds.war and it has a few extra features compared to BlazeDS, but from a deployment standpoint things don t change.

) If your client program has to figure out for itself how much data to read, it s a good idea to call the read() method (with a byte array to read the data into) Unlike readFully(), read() won t block if it can t fill the whole array (although it will block if there s no data to read at all and the server hasn t yet closed the stream) As long as there s at least one byte of data to read, the method read() reads as many bytes of data as it can and then returns the number of bytes it read To make sure you got all the data, you can call read() multiple times (specifying an offset to avoid overwriting the data you ve already read) until the method returns a value of -1 to indicate that the end of the stream has been reached.

In BlazeDS and LCDS, there is more to configure than code. In both these cases, a message broker servlet is the central manager of all communication and service invocations. Configuring data services is

equivalent to configuring this message broker. In the web.xml file where you set up this servlet, you define the configuration file it should read. The portion of web.xml where you define this is as follows:

If the local information consisted of two classes, the Create method and IUserIdentification definition would consist of those two classes The examples proposed are only rules of thumb, but two Create factory methods are needed to indicate an identified user and an unidentified user The last step is to wire everything together in the globalasax file As in the Accept HTTP header example, the user identification code is placed in the BeginRequest handler, which is the first phase called when handling a request Before the code is shown, let s ask ourselves whether that is the best place to put the user identification code Regardless of platform, there are various phases, and one of them is before an authentication phase As it stands right now, the wiring is happening before the server performs the authentication, which might mean that the authentication by the server is not complete.

Another trick is to use the available() method of the javaio DataInputStream to determine how many bytes of data are available before reading them in That way, you can call readFully() with no danger of blocking The only problem with using available() is that in my tests I ve found it has an annoying tendency to return zero even when there are bytes available to read, so I generally don t use it..

<servlet> <servlet-name>MessageBrokerServlet</servlet-name> <display-name>MessageBrokerServlet</display-name> <servlet-class>flex.messaging.MessageBrokerServlet</servlet-class> <init-param> <param-name>services.configuration.file</param-name> <param-value>/WEB-INF/flex/services-config.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet>

You may notice that the value for the services.configuration.file is /WEB-INF/flex/servicesconfig.xml. This is the default configuration, and most often there is no need to change it. However, if you need the configuration file to be at a different location or have a different name, you know where to make the modifications so that the new values are picked up. All service and endpoint configurations are specified in this configuration file, which by default is called services-config.xml. From a functional standpoint, a data service tries to accomplish the following: