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EDG-LCFG integration issues

EDG-LCFG integration issues. CERN, 20/6/2002 German.Cancio@cern.ch. Overview. LCFGng vs. WP4-config Choices for interfacing LCFG with WP4-config Discussion. LCFG. mkxprof. DBM Cache. XML. .def, .h. notification and poll. server. rdxprof (HTTP GET). client.

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EDG-LCFG integration issues

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  1. EDG-LCFG integration issues CERN, 20/6/2002 German.Cancio@cern.ch

  2. Overview • LCFGng vs. WP4-config • Choices for interfacing LCFG with WP4-config • Discussion

  3. LCFG mkxprof DBM Cache XML .def, .h notification and poll server rdxprof (HTTP GET) client (flat key=value format) ‘configure’ LCFG developments Config access libs EDG developments NVAAPI (subset) My Component LCFG Component libs LCFGng: configuration flow

  4. .tpl XML DBM Cache server client CCM daemon LCFGng vs. WP4-config flows WP4 pan poll fetch (HTTP GET) (hierarchical) CMP protocol NVAAPI registering & callback Generic executable

  5. LCFG WP4 DBM Cache .tpl XML mkxprof DBM Cache XML .def, .h pan notification and poll poll server rdxprof (HTTP GET) fetch (HTTP GET) client ‘configure’ Config access libs CCM daemon NVAAPI CMP protocol My Component NVAAPI registering & callback LCFG Component libs Generic executable Comparison

  6. Interfacing LCFG with WP4-config Approach #1: Replace mkxprof with pan, use common XML • Currently, pan can generate LCFG-compatible XML. • However, current LCFG components require resource definition information (.def files) for ‘flattening’ resources into key-value pairs. This legacy information is not necessary in HLD. Two possibilities: • A) incorporate component resource definition information into special templates, and send over XML • B) copy resource definition information to the client side and evaluate it by rdxprof. • Advantages: • Backwards compatible • Clear cut in responsibilities LCFG <-> WP4-Config • Issues: • Needs a much more precise definition of the XML profile structures! • Compiler needs to support ordered named lists (not the case currently) • The NVA API implementation has to ‘unflatten’ key-value resources -> complex! • Resource definition information uses a different syntax than the HLD. • Both the HLD and the resource definition info have to be kept in sync. • Does not support the global schema.

  7. Interfacing LCFG with WP4-config Approach #2: same as #1, but with implicit resource definitions • For new components, rdxprof could use implicit conventions for avoiding the .def files. • Advantages: • Same as #1 • New components don’t require .def files • Disadvantages: • No support for global schema. • NVA API has to unflatten key-value resources -> complex.

  8. Interfacing LCFG with WP4-config Approach #3: change LCFG flat DBM format • Use the CCM DBM format, which allows for config caching without information loss (no key-value resources, no need for ‘resource definitions’). • Advantages: • Direct access for NVA API • No complex resource flatting/unflatting • Would allow global schema (needs some additional work for callback notifications) • Disadvantages: • Breaks backwards compatibility (no key-value config access)

  9. Interfacing LCFG with WP4-config Approach #4: same as #3, keeping .def files for old components • A backwards compatibility module allows to flat out resources for old-style components using the .def file. • Advantages: • Same as #3 • Backwards compatibility • Disadvantages: • Complexity of implementation? • Needs further detailed thought.

  10. Interfacing LCFG with WP4-config Approach #5: use CCM • Replace the LCFG DBM access libraries and the NVA API subset by the CCM and full NVA API. • Consider using fetch instead of rdxprof for reading the profile information. • Advantages: • Same as #3 • Disadvantages: • Same as #3 • CCM probably needs a reimplementation • Additional LCFG rdxprof and config access libs functionality needs to be understood and implemented if needed.

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