1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
// $Id$
// ============================================================================
//
// = LIBRARY
// TAO/examples/POA/Loader
//
// = FILENAME
// Servant_Activator.cpp
//
// = DESCRIPTION
// Implementation of <ServantActivator>, which is used by a POA
// with a RETAIN policy.
//
// = AUTHOR
// Kirthika Parameswaran <kirthika@cs.wustl.edu>
//
// ============================================================================
#include "Servant_Activator.h"
#include "ace/OS_NS_string.h"
ACE_RCSID (Loader,
Servant_Activator,
"$Id$")
// Initialization.The dllname is used by the Loactor to load it into
// memory. The factory function is the point of entry into the dll and
// is used for obtaining the servant. The garbage_collection_function
// is used to kill the servant.
ServantActivator::ServantActivator (CORBA::ORB_ptr orb,
const char *dllname,
const char *factory_function,
const char *garbage_collection_function)
: orb_ (CORBA::ORB::_duplicate (orb))
{
// The dll is opened using the dllname passed.
if (this->dll_.open (dllname) == -1)
ACE_ERROR ((LM_ERROR,
"%p\n",
this->dll_.error ()));
// Obtain the symbol for the function that will get the servant
// object.
// Cannot go from void* to function pointer directly. Cast the void*
// to long first.
void *symbol = this->dll_.symbol (factory_function);
long function = reinterpret_cast<long> (symbol);
servant_supplier_ =
reinterpret_cast<SERVANT_FACTORY> (function);
// Obtain the symbol for the function which will destroy the
// servant.
symbol = this->dll_.symbol (garbage_collection_function);
function = reinterpret_cast<long> (symbol);
servant_garbage_collector_ =
reinterpret_cast<SERVANT_GARBAGE_COLLECTOR> (function);
}
// This method associates an servant with the ObjectID.
PortableServer::Servant
ServantActivator::incarnate (const PortableServer::ObjectId &oid,
PortableServer::POA_ptr poa
ACE_ENV_ARG_DECL)
ACE_THROW_SPEC ((CORBA::SystemException,
PortableServer::ForwardRequest))
{
// Obtain the servant else exception.
PortableServer::Servant servant =
(*servant_supplier_) (oid,
poa,
this->orb_.in ());
if (servant != 0)
return servant;
else
ACE_THROW_RETURN (CORBA::OBJECT_NOT_EXIST (),
0);
}
// This is the method invoked when the object is deactivated or the
// entire POA is is deactivated or destroyed.
void
ServantActivator::etherealize (const PortableServer::ObjectId &oid,
PortableServer::POA_ptr poa,
PortableServer::Servant servant,
CORBA::Boolean,
CORBA::Boolean remaining_activations
ACE_ENV_ARG_DECL_NOT_USED)
ACE_THROW_SPEC ((CORBA::SystemException))
{
// If there are no remaining activations i.e ObjectIds associated
// with test servant, deactivate it by calling the
// garbage_collection_function. Etheralization happens on
// POA::destroy() and/or Object::deactivate().
if (remaining_activations == 0)
(*servant_garbage_collector_) (oid,
poa,
servant);
}
|
