Common plug-in C functions and Java methods
Warning
Plug-in operations run synchronously; that is, AR System waits for a plug-in to complete its processing before the server continues its processing. Thus, a badly written plug-in can adversely impact AR System performance and stability. Plug-in developers must:
- Maintain thread safety.
- Use minimal processing logic for optimal code execution.
- Implement only callback methods that are required or that have custom logic for a given plug-in.
- Allocate or free resources appropriately to prevent resource leaks.
- Optimize any costly operation that must be performed (or data structures that must be built) by employing a meaningful caching strategy.
Common C plug-in functions
The following C API functions are common to every type of plug-in:
ARPluginCreateInstanceARPluginDeleteInstanceARPluginEventARPluginIdentifyARPluginInitializationARPluginSetPropertiesARPluginTermination
In general, these functions use the same structure as other AR System C API functions. The plug-in server calls the functions and provides the necessary input data. The plug-in accepts the data, processes it, and returns the appropriate response data to the plug-in server.
The following figure shows a typical sequence of calls that the plug-in server makes on a C plug-in.
C plug-in call sequence
For more information, see AR System plug-in API functions.
Common Java plug-in methods
The methods defined in the ARPluggable interface and the ARPlugin abstract class are common to all plug-in types. For more information, see the Java plug-in API online documentation in ARSystemServerInstallDir\ARserver\api\javaplugins\arpluginsdocVerNum.jar.
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