com.saxonica.deploy
Interface SharedApplicationDataHandler

public interface SharedApplicationDataHandler

SharedApplicationDataHandler is an interface that can be implemented by applications wanting to run generated servlet code in an environment offering shared access to resources, for example the ability to execute many compiled queries concurrently against the same pool of in-memory documents. The object that implements this interface must be accessible to the compiled query servlets when it calls getServletContext().getAttribute("com.saxonica.servlet.applicationdata").

The shared application data handler is called at init() time to supply the Saxon Configuration in which the query should run, and again on each servlet request to initialize the Controller under which the query runs, for example with values for external variables and with serialization options. The application data handler may also call Controller.setURIResolver() to supply a URI handler for calls on the doc() function, and can thus manage a pool of named documents in memory that are used by all queries within the application.

Method Summary

Configuration	getConfiguration(javax.servlet.ServletContext servletContext) Supply the Configuration in which queries will execute.
void	handleServletRequest(javax.servlet.http.HttpServletRequest req, Controller controller) Handle a servlet request.

Method Detail

getConfiguration

Configuration getConfiguration(javax.servlet.ServletContext servletContext)

Supply the Configuration in which queries will execute. This method will be called from the init() method of a servlet.

Parameters:

servletContext - defines the environment in which the servlet executes

Returns:

the Configuration in which the servlet is to run. If queries are schema-aware, this must be a SchemaAwareConfiguration

handleServletRequest

void handleServletRequest(javax.servlet.http.HttpServletRequest req,
                          Controller controller)

Handle a servlet request.