InvokeHandler (Java 2 Platform SE v1.4.1) - JDK 5 Documentation v1.4.1, Java 2 SDK 英文文档

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Java^TM 2 Platform
Std. Ed. v1.4.1

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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.