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The meta library provides information about the running ruleset. The following are available (notice notice that these are values, not functions):

• meta:eci - the event channel identifier on which the current event was raised

• meta:host - the public DNS name of the machine running the engine, including port number. Does not include the trailing "/". ex.

   http

   http://localhost:

  8080 You

  8080 You may configure this value when starting your pico engine. See the developer tips page to see why and how.

• meta:inEvent - Boolean value true if the engine is evaluating an event for this pico, false otherwise

• meta:inQuery - Boolean value true if the engine is evaluating a query for this pico, false otherwise

• meta:picoId -

   the

   the ID of the currently running pico

• meta:rid - the ruleset ID of the currently running ruleset

• meta:ruleName - the name of the rule currently being evaluated

• meta:rulesetURI -

   the

   the URL from which the currently running ruleset was registered/installed

• meta:txnId - the transaction ID for the current evaluation. This is mostly useful for debugging or as a correlation identifier

• meta:rulesetConfig - the configuration Map given when the ruleset was installed in the pico
  

The following are not available in version 1.0.0 of the pico-engine, though they were available in version 0.52.4 and most earlier versions.

• meta:rulesetAuthor - the author from the meta section of the current ruleset
• meta:rulesetDescription - the description from the meta section of the current ruleset
• meta:rulesetName - the name from the meta section of the current ruleset
  

...

...

• meta:callingRID() - returns the RID of the calling ruleset if running in a module, or the current ruleset ID otherwise.

• meta:callingVersion() - returns the version of the calling ruleset if running in a module, or the current ruleset version otherwise.

• meta:errorCount() - returns the number of errors for current rule execution. Reset to 0 for each new rule execution.

• meta:inModule() - returns a Boolean value indicating whether the current code is running in a module.

• meta:moduleRID() - returns the RID of the module if running in a module, or the current ruleset ID otherwise.

• meta:moduleVersion() - returns the version of the module if running in a module, or the current ruleset version otherwise.

• meta:version() - returns the version of the currently running ruleset.

Note, in the case of meta:moduleRID(), meta:moduleVersion(), and meta:inModule(), care has been taken to preserve static behavior. So, for example, if you do the following, you should get the result you expect based on static function semantics:

ruleset my_module {
 
  ...
  global {
    myRid = function() { meta:rid }
  }
}
 
ruleset use_my_module {
  meta {
    use module my_module
  }
  global {
    x = my_module:myRid();
    // x = my_module, not use_my_module
  }
}

...