org.omg.CORBA.portable
Interface InvokeHandler

All Known Subinterfaces:

Tie

All Known Implementing Classes:

BindingIteratorPOA, NamingContextExtPOA, NamingContextPOA, ServantActivatorPOA, ServantLocatorPOA

public interface InvokeHandler

This interface provides a dispatching mechanism for an incoming call. It is invoked by the ORB to dispatch a request to a servant.

Method Summary

OutputStream

_invoke(String method, InputStream input, ResponseHandler handler) Invoked by the ORB to dispatch a request to the servant.

Method Detail

_invoke

public OutputStream _invoke(String method,
                            InputStream input,
                            ResponseHandler handler)
                     throws SystemException

Invoked by the ORB to dispatch a request to the servant. ORB passes the method name, an InputStream containing the marshalled arguments, and a ResponseHandler which the servant uses to construct a proper reply. Only CORBA SystemException may be thrown by this method. The method must return an OutputStream created by the ResponseHandler which contains the marshalled reply. A servant must not retain a reference to the ResponseHandler beyond the lifetime of a method invocation. Servant behaviour is defined as follows:

1. Determine correct method, and unmarshal parameters from InputStream.

2. Invoke method implementation.

3. If no user exception, create a normal reply using ResponseHandler.

4. If user exception occurred, create exception reply using ResponseHandler.

5. Marshal reply into OutputStream returned by ResponseHandler.

6. Return OutputStream to ORB.

Parameters:

method - The method name.

input - The InputStream containing the marshalled arguments.

handler - The ResponseHandler which the servant uses to construct a proper reply

Returns:

The OutputStream created by the ResponseHandler which contains the marshalled reply

Throws:

SystemException - is thrown when invocation fails due to a CORBA system exception.