This page is under construction and is not yet complete.
APEL Server Design
The new APEL server is written in Python. It has the following components:
- Record loader
- Record publisher
APEL Message Format
The SSM is the messaging system used by APEL to transmit messages. It is written in Python and uses the STOMP protocol.
External SSM Testing
APEL SSM Testing: If you are interested in testing the new STOMP interface or want to develop your own client.
This has the task of taking the received messages and inserting the records in the database. At present there are three message types defined:
- Job Record messages
- Summary Record messages
- Sync Record messages
The header in the message defines the type of records the message will contain and the version of the format. This will enable us to identify newer versions if they are defined.
This simple model allows the definition of alternative message types for different records which the record loader can then be configured to handle, for example, there will be a SpecIntHistory Record message type which is a requirement of the APEL portal.
This processes the Job Records and Summary Records to create the CPU, User Summaries and SpecIntHistory tables required by the portal.
This takes the information from a database and produces messages to be sent to the portal from the server using an instance of the SSM. (The Record publisher will also be used by the new version of the APEL client to create messages from the APEL client database to be sent to the APEL server.)
This verifies that the senders of the messages via the SSM are known to APEL.