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Revision as of 12:57, 18 January 2012 by Ap (talk | contribs) (Record loader)
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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:

  • SSM
  • Record loader
  • Summarizer
  • Record publisher
  • Authentication
  • Monitoring

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.

Record loader

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.

Record publisher

This takes the information from a database and produces messages.


This verifies that the senders of the messages via the SSM are known to APEL.