Constant TAO CORBA IOR - corba

Question

How to configure TAO corba server so that IOR string of this server generated from object_to_string is constant?
Each time the IOR string generated from object_to_string changes once server restarts. This is inconvenient since client has to update its cached server IOR string via reloading IOR file or namingservice accessing. As a result, it would be useful if server can generate a constant IOR string, no matter how many times it restarts.
My corba server is based on ACE+TAO and i do remember TAO supports constant IOR string: the IOR string each time it generates are same, and the solution is add some configurations for server. But i could not remember these configurations now.
=============================================
UPDATE:
In ACE_wrappers/TAO/tests/POA/Persistent_ID/server.cpp, i added a new function named testUniqe() which is similiar to creatPOA method. And the update file content is:
void testUniqu(CORBA::ORB_ptr orb_, PortableServer::POA_ptr poa_){
CORBA::PolicyList policies (2);
policies.length (2);
//IOR is the same even it is SYSTEM_ID
policies[0] = poa_->create_id_assignment_policy (PortableServer::USER_ID);
policies[1] = poa_->create_lifespan_policy (PortableServer::PERSISTENT);
PortableServer::POAManager_var poa_manager = poa_->the_POAManager ();
PortableServer::POA_ptr child_poa_ = poa_->create_POA ("childPOA", poa_manager.in (), policies);
// Destroy the policies
for (CORBA::ULong i = 0; i < policies.length (); ++i) {
policies[i]->destroy ();
}
test_i *servant = new test_i (orb_, child_poa_);
PortableServer::ObjectId_var oid = PortableServer::string_to_ObjectId("xushijie");
child_poa_->activate_object_with_id (oid, servant);
PortableServer::ObjectId_var id = poa_->activate_object (servant);
CORBA::Object_var object = poa_->id_to_reference (id.in ());
test_var test = test::_narrow (object.in ());
CORBA::String_var ior = orb_->object_to_string(test.in());
std::cout<<ior.in()<<std::endl;
poa_->the_POAManager()->activate();
orb_->run();
}
int
ACE_TMAIN (int argc, ACE_TCHAR *argv[])
{
try
{
CORBA::ORB_var orb =
CORBA::ORB_init (argc, argv);
int result = parse_args (argc, argv);
CORBA::Object_var obj =
orb->resolve_initial_references ("RootPOA");
PortableServer::POA_var root_poa =
PortableServer::POA::_narrow (obj.in ());
PortableServer::POAManager_var poa_manager =
root_poa->the_POAManager ();
testUniqu(orb.in(), root_poa.in());
orb->destroy ();
}
catch (const CORBA::Exception& ex)
{
ex._tao_print_exception ("Exception caught");
return -1;
}
return 0;
}
The problem is that the output server IORs are still different once restart. I also compared this code to the one in Page 412(Advance Corba Programming), but still fail..
///////////////////////////////////
UPDATE:
With "server -ORBListenEndpoints iiop://:1234 > /tmp/ior1", the generated two IORs are:
IOR:010000000d00000049444c3a746573743a312e300000000001000000000000007400000001010200150000007368696a69652d5468696e6b5061642d543431300000d2041b00000014010f0052535453f60054c6f80c000000000001000000010000000002000000000000000800000001000000004f41540100000018000000010000000100010001000000010001050901010000000000
IOR:010000000d00000049444c3a746573743a312e300000000001000000000000007400000001010200150000007368696a69652d5468696e6b5061642d543431300000d2041b00000014010f0052535468f60054da280a000000000001000000010000000002000000000000000800000001000000004f41540100000018000000010000000100010001000000010001050901010000000000
The result for tao_catior for ior1 and ior2:
ior1:
The Byte Order: Little Endian
The Type Id: "IDL:test:1.0"
Number of Profiles in IOR: 1
Profile number: 1
IIOP Version: 1.2
Host Name: **
Port Number: 1234
Object Key len: 27
Object Key as hex:
14 01 0f 00 52 53 54 53 f6 00 54 c6 f8 0c 00 00
00 00 00 01 00 00 00 01 00 00 00
The Object Key as string:
....RSTS..T................
The component <1> ID is 00 (TAG_ORB_TYPE)
ORB Type: 0x54414f00 (TAO)
The component <2> ID is 11 (TAG_CODE_SETS)
Component length: 24
Component byte order: Little Endian
Native CodeSet for char: Hex - 10001 Description - ISO8859_1
Number of CCS for char 1
Conversion Codesets for char are:
1) Hex - 5010001 Description - UTF-8
Native CodeSet for wchar: Hex - 10109 Description - UTF-16
Number of CCS for wchar 0
ecoding an IOR:
//ior2
The Byte Order: Little Endian
The Type Id: "IDL:test:1.0"
Number of Profiles in IOR: 1
Profile number: 1
IIOP Version: 1.2
Host Name: **
Port Number: 1234
Object Key len: 27
Object Key as hex:
14 01 0f 00 52 53 54 68 f6 00 54 da 28 0a 00 00
00 00 00 01 00 00 00 01 00 00 00
The Object Key as string:
....RSTh..T.(..............
The component <1> ID is 00 (TAG_ORB_TYPE)
ORB Type: 0x54414f00 (TAO)
The component <2> ID is 11 (TAG_CODE_SETS)
Component length: 24
Component byte order: Little Endian
Native CodeSet for char: Hex - 10001 Description - ISO8859_1
Number of CCS for char 1
Conversion Codesets for char are:
1) Hex - 5010001 Description - UTF-8
Native CodeSet for wchar: Hex - 10109 Description - UTF-16
Number of CCS for wchar 0
The diff result is:
< 14 01 0f 00 52 53 54 53 f6 00 54 c6 f8 0c 00 00
---
> 14 01 0f 00 52 53 54 68 f6 00 54 da 28 0a 00 00
19c19
< ....RSTS..T................
---
> ....RSTh..T.(..............
Similar diff result is:
< 14 01 0f 00 52 53 54 62 fd 00 54 2c 9a 0e 00 00
---
> 14 01 0f 00 52 53 54 02 fd 00 54 f9 a9 09 00 00
19c19
< ....RSTb..T,...............
---
> ....RST...T................
The difference is in ObjectKey.
============================================
update:
Instead of using above code, i find a better solution with helper TAO_ORB_Manager which is used NamingService and TAO/examples/Simple. TAO_ORB_Manager encapsulates API and generate persistent IORs, as example code in Simple.cpp:
if (this->orb_manager_.init_child_poa (argc, argv, "child_poa") == -1){
CORBA::String_var str =
this->orb_manager_.activate_under_child_poa (servant_name,
this->servant_.in ());
}
This is some description for TAO_ORB_Manager:
class TAO_UTILS_Export TAO_ORB_Manager
{
/**
* Creates a child poa under the root poa with PERSISTENT and
* USER_ID policies. Call this if you want a #a child_poa with the
* above policies, otherwise call init.
*
* #retval -1 Failure
* #retval 0 Success
*/
int init_child_poa (int &argc,
ACE_TCHAR *argv[],
const char *poa_name,
const char *orb_name = 0);
/**
* Precondition: init_child_poa has been called. Activate <servant>
* using the POA <activate_object_with_id> created from the string
* <object_name>. Users should call this to activate objects under
* the child_poa.
*
* #param object_name String name which will be used to create
* an Object ID for the servant.
* #param servant The servant to activate under the child POA.
*
* #return 0 on failure, a string representation of the object ID if
* successful. Caller of this method is responsible for
* memory deallocation of the string.
*/
char *activate_under_child_poa (const char *object_name,
PortableServer::Servant servant);
...................
}
After build, I can get what i want with -ORBListenEndpoints iiop://localhost:2809 option. Thanks #Johnny Willemsen help

Answer 1

You have to create the POA with a persistent lifespan policy, see ACE_wrappers/TAO/tests/POA/Persistent_ID as part of the TAO distribution.