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-$Id $
-
-============================ TAO Time Service==============================
-
-This is a complete implementation of the CORBA time service spec. The
-service offers a globally synchronized time to a requesting
-client. The Time Service interface has been implemented as two servants:
-the clerk and the server. Clients who wish to use the service talk to
-clerks and the clerks in turn keep their time synchronized
-globally. The clerks do this by talking to the servers running on
-different machines.
-
-There needs to be atleast one time server running in the network. The Clerks
-update their time periofically from the servers. The servers and clerks
-export their IORs through the
- * Naming Service.
- * Files
-The Servers can also be activated on demand by the Clerks if they have been
-registered with an Implementation Repository.
-
-If Naming Service is being used the clerks and servers are registered in
-different Naming Contexts as :
-
-For the clerks : ClerkContext->Clerk:<local_host_name>
-For the server : ServerContext->Server:<local_host_name>
-
-The machine name is included to make the object name unique and distinguish
-between the various servers and clerks.
-
-A sample run of the TimeService can be done as follows :
-
-* Using the Naming Service :
-
-1. Run TAO/orbsvcs/Time_Service/server on different machines.
-2. Run TAO/orbsvcs/Time_Service/clerk -t 5 on some machines.
-3. Run the TAO/orbsvcs/tests/Time/client on one of the machines where a clerk
- is running.
-
-* Using Files :
-
-1. Run TAO/orbsvcs/Time_Service/server -o server_ior on different machines.
-2. Run TAO/orbsvcs/Time_Service/clerk -t 5 -f server_ior -o clerk_ior on some
- machines.
-3. Run the TAO/orbsvcs/tests/Time/client -f clerk_ior on one of the machines
- where a clerk is running.
-
-* Using the Implementation Repository :
-
-1. Run the Implementation Repository service as :
-
- TAO/orbsvcs/Time_Service> ../ImplRepo_Service/ImplRepo_Service -ORBsvcconf
- implrepo.conf -ORBobjrefstyle url -d 1
-
-2. Run the Server as
-
- TAO/orbsvcs/Time_Service> server -o server_ior -r -i
-
-3. Run the Clerk as
-
- TAO/orbsvcs/Time_Service> clerk -f server_ior -t 5 -o clerk_ior
-
-4. Run the client as
-
- TAO/orbsvcs/tests/Time/client -f clerk_ior
-
-Algorithms
-----------
-
-Currently, updating the system time involves taking the average of all
-the times received from the servers. This can be extended by using a
-more elaborate distributed time synchronization algorithm.
-
-Version Updates : (10th March, 1999)
------------------
-
-The TAO Time Service has been updated to include the timezone information
-in the Universal Time Object. This object now also has an inaccuracy estimate
-in it. The inaccuracy is a measure of the skew in the synchronization of
-the clerks time. It is the difference between the highest and the lowest times
-from the servers that the clerk synchronizes its time with. The high-inaccuracy
-and the low-inaccuracy fields are also being calculated from the inaccuracy as
-follows :
-
- Inaccuracy 64-bits
- |------------------------------------|
- | | inacchi | inacclo |
- |------------------------------------|
- 16-bits 16-bits 32-bits
-
-Thanks to Brian Dance <Brian_Dance@UECCS.co.uk> for reporting this.
-
-Future Versions of the service could include other measures of inaccuracy too,
-say the one based on precision in the time reported by servers. In this case
-the servers will have to supply an estimate of inaccuracy in their times.
-
-