org.omg.PortableInterceptor
Interface Current
- Current, CurrentOperations, CurrentOperations, IDLEntity, Object, Serializable
The portable interceptor Current (PICurrent) contains multiple slots where an
interceptor can rememeber the request - specific values between subsequent
calls of the interceptor methods. In multithreaded environment, it is not
possible just to store such data in the interceptor object fields.
On the client side, it is possible to set the initial slot values by
modifying slots on the Current, returend by ORB.resolve_initial_references
("PICurrent"). The returned value is narrowed with the
CurrentHelper.narrow(Object). On the subsequent invocation, made from the
same thread, the interceptors will see the initial slot values as they were
set using this approach.
There are no way to set the initial values for the server side interceptors,
the default values (Any with typecode TCKind.tk_null) should be always
assumed.
Since an Interceptor is running in a thread, it is running with a thread
context and there is a PICurrent on that context. If the Interceptor calls
ORB.resolve_initial_references ("PICurrent"), it gets the PICurrent within
its thread scope. This PICurrent is different than the request scope
PICurrent that the Interceptor obtains via calls to the Client- or Server-
RequestInfo object.
On the client side the PICurrent can be used to detect the recursive
invocations, performed by interceptors. If one of the interceptors makes call
via the same ORB, this call is then showed to all interceptors, including the
interceptor that made it. To avoid infinite recursion, the during each call
this interceptor can set some "recursion flag" into one of the slots of the
PICurrent. If the flag is set on the entry point, this indicates a recursive
call of that request.
_create_request, _create_request, _duplicate, _get_domain_managers, _get_interface_def, _get_policy, _hash, _is_a, _is_equivalent, _non_existent, _release, _request, _set_policy_override |
Current.java --
Copyright (C) 2005 Free Software Foundation, Inc.
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