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diff --git a/TAO/docs/releasenotes/PSS.html b/TAO/docs/releasenotes/PSS.html new file mode 100644 index 00000000000..3f44535a1b4 --- /dev/null +++ b/TAO/docs/releasenotes/PSS.html @@ -0,0 +1,82 @@ +<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"> +<html> +<body text="#000000" bgcolor="#FFFFFF"> + + <head> + <title>Persistent State Service status</title> + <!-- $Id$ --> + </head> + + <body> + <center> + <h1><a name="orb"></a>Persistent State Service</h1> + Points of contact: <a href="mailto: gontla_p@ociweb.com">Priyanka Gontla</a> + + <p>Last Update: 2002/07/29 </p> + </center> + + <p>Persistent State Service (PSS) desribes a way of making a + service persistent. The fact that PSS is being used by a + service is known only to the service (server) and not to the + client which makes use of the service. PSS presents persistent + information as storage objects stored in storage homes, to + quote the specification. The storage homes are the datastores + where the persistent data is saved. </p> + <br> + <p>The specification introduced Persistent State Definition + Language (PSDL), a superset of IDL with five new + constructs. PSDL is used to specify the interface to the + datastore. The PSDL file used in the application will define + the types that might be saved in the datastore. </p> + <br> + <p>We have a compiler, psdl_tao, which is similar to the tao_idl + compiler, which will process the psdl file and generate stubs + that are used mainly for the insertion and extraction + operations. + </p> + + <a name="current"><h3>Current status:</h3></a> + + <ul> + <li><p>The PSDL compiler understands and supports the simple + types like <br><CODE> + typdef, module, structures, interfaces.</CODE> + </p> + </li> + <li> + <p> The datastore for now is a regular file. The + <CODE>libTAO_PSDL_Datastore</CODE> interfaces the + datastore and helps write and read from the datastore. + The data that is saved persistently is a hash map whose + external id is TAO_PSDL_String, a wrapper around + ACE_CString and the internal id is TAO_PSDL_OctetSeq, a + wrapper around for CORBA::OctetSeq. </p> + </li> + <li> + <p> There is an example in + $ACE_ROOT/TAO/orbsvcs/examples/PSS which shows how the PSS + can be used to make a simplified naming service persistent. + </p> + </li> + </ul> + + <a name="future"><h3>Future work:</h3></a> + + <ul> + <li> + <p>Add support to the remaining types defined in PSDL. + </p> + </li> + + <li> + <p>Use RMCast to have another form of persistency via data + replication. + </p> + </li> + + </ul> + + <P><HR><P> + <a href="#toc">Back to TOC</a> + </body> +</html> |