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[AGL/documentation.git] / docs / 4_APIs_and_Services / 4.5_Message_Signaling / 4_AGL_Service_Signal_Composer / 3_Plugins.md

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-edit_link: ''
-title: Plugins
-origin_url: >-
-  https://git.automotivelinux.org/apps/agl-service-signal-composer/plain/docs/part-1/3-Plugins.md?h=master
----
-
-<!-- WARNING: This file is generated by fetch_docs.js using /home/boron/Documents/AGL/docs-webtemplate/site/_data/tocs/apis_services/master/agl-service-signal-composer-developer-guides-api-services-book.yml -->
-
-# Plugins
-
-Plugins are C/C++ shared libraries loaded by the binding to execute some
-simple routine. Routine could be on reception of a new signal or at sources
-initialization time or signal subscription with the respective JSON field
-`onReceived` `init` and `getSignals`
-
-A default plugin (builtin) is provided with 2 functions:
-
-- **defaultOnReceived**: set and record a new signal value and its timestamp
- in the signal composer service. It simply tooks the incoming event JSON object
- and search for *key* `value` and `timestamp` then call function
- `setSignalValue`.
-- **setSignalValueWrap**: a `lua2c` function the could be called from any LUA
- script to record a new signal value.
-
-> **CAUTION**: `timestamp` value has to be typed as *uint64_t* with
-> a **nanosecond** precision using a realtime clock. To correctly store it in
-> a JSON-C object use the int64 type with the according fonctions:
-> *json_object_new_int64()*
-> *json_object_get_int64()*
-> *json_object_set_int64()*
-> *...*