Difference between revisions of "Category:Model"
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Revision as of 11:33, 2 March 2014
Contents
Model types
A model implements the direct interface to the database.
They are PHP classes below core/Channel directory.
There are in general 4 different model types:
- Direct models which stores their data directly and can't have sub channels (e.g. Sensor, Meter)
- Proxy models with exact 1 sub channel for readout (e.g. SensorToMeter, Calculator)
- Grouping models which merges always sub channel data (e.g. Accumulator, Differentiator, Average)
(Sub channels can be all kind of readable models again) - Special models provide internal calculated data(e.g. Daylight)
General characteristics
A model implements in their sources the following characteristics and interface methods.
Read
- All direct and proxy channels are readable to query their readings.
- All grouping models are readable (except multi sensors like SMA/Webbox or JSON)
(This attribute is held redundant in database for better performance on feature requests.)
Write
- All direct channels are writable to store readings.
- No grouping model is writable (except multi sensors like SMA/Webbox or JSON)
(This attribute is held redundant in database for better performance on feature requests.)
Childs
| Child count | Description |
|---|---|
| 0 | No child channels allowed, almost a direct model |
| 1 | Exact 1..n child channel allowed, almost a proxy model |
| 2..n | Exact 1..n child channel allowed, almost a special calculating model |
| -1 | Unlimited child channels allowed, almost a grouping model |
Graph
Define, if the channel based of this model is usable in charts view. Not all readable models are usable, especially all the models for external services.
Grouping models
Grouping models delegate all data access during storing or readout to their sub channels.
Read only models
These models perform calculations of any kind.
These models implemts an interface for external services to provide data in special formats:
Writable, not readable models
These models act like Multi sensors. They have concrete childs channels, which held the measuring data. The measuring data will provided to these models and distributed to their child channels.
Special models
These models perform mostly internal calculations not based on real measuring data.
Pages in category "Model"
The following 5 pages are in this category, out of 5 total.
