mirror of
https://github.com/openhab/openhab-addons.git
synced 2025-01-11 15:42:10 +01:00
15 lines
1000 B
Markdown
15 lines
1000 B
Markdown
|
# InMemory Persistence
|
||
|
|
|
||
|
|
The InMemory persistence service provides a volatile storage, i.e. it is cleared on shutdown.
|
||
|
|
Because of that the `restoreOnStartup` strategy is not supported for this service.
|
||
|
|
|
||
|
|
The main use-case is to store data that is needed during runtime, e.g. temporary storage of forecast data that is retrieved from a binding.
|
||
|
|
|
||
|
|
Since all data is stored in memory only, there is no default strategy for this service.
|
||
|
|
Unlike other persistence services, you MUST add a configuration, otherwise no data will be persisted.
|
||
|
|
To avoid excessive memory usage, it is recommended to persist only a limited number of items and use a strategy that stores only data that is actually needed.
|
||
|
|
|
||
|
|
The service has a global configuration option `maxEntries` to limit the number of datapoints per item, the default value is `512`.
|
||
|
|
When the number of datapoints is reached and a new value is persisted, the oldest (by timestamp) value will be removed.
|
||
|
|
A `maxEntries` value of `0` disables automatic purging.
|