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Modules.nas: Difference between revisions
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var bar = foo.get("bar"); # get variable "bar" defined in FGDATA/Nasal/modules/foo/main.nas (or a file included by this file) | var bar = foo.get("bar"); # get variable "bar" defined in FGDATA/Nasal/modules/foo/main.nas (or a file included by this file) | ||
}} | }} | ||
= Property tree interface for modules.nas = | |||
In the property tree there is a subtree /nasal to control modules and get some statistics. | |||
The properties available depend on the type of module ("load-once" or "reloadable", see [[Nasal Initialization]] for more information on the differences). | |||
== Reloadable modules / frameworks == | |||
Modules handled by modules.nas will have their properties in /nasal/modules/<moduleName> where <moduleName> is given by the developer when calling either | |||
{{code|Module.new("<moduleName>")}} or {{code|modules.load("<moduleName>")}}. | |||
In the latter case <moduleName> specifies the subdirectory FGDATA/Nasal/modules/<moduleName> in which some framework is stored. | |||
{| class="wikitable" | |||
|- | |||
! property !! type !! content | |||
|- | |||
| loaded || bool || true if module was loaded without errors | |||
|- | |||
| reload || bool || set this to true to trigger reload | |||
|- | |||
| listeners || int || Number of tracked listeners | |||
|- | |||
| listener-hits || int || If debugging is enabled, this prop shows the total number of hits to all tracked listeners. | |||
|- | |||
| timers || int || Number of tracked timers (maketimer). | |||
|} | |||
== Legacy load-once modules == | |||
A legacy load-once module is a direct (1st level) subdirectory of FGDATA/Nasal/ and its corresponding property tree is /nasal/<moduleName>/ where <moduleName> equals the name of the subdirectory. | |||
It is handled by C++ code and must have a corresponding entry in FGDATA/defaults.xml which defines a property "enabled" and optionally a property "module". | |||
If enabled is set to false in defaults.xml, the C++ code will setup a listener and load the module as soon as enabled is set to true. | |||
The property name "module" is a bit misleading, it is used to define into which namespace the files shall be loaded. | |||
For each .nas file in the subdirectory a file[i] property is created holding the full path+filename. | |||
The bool "loaded" property shows the status of the module. | |||
= Existing modules with reload support = | = Existing modules with reload support = | ||