openhab-addons/bundles/org.openhab.persistence.inmemory
Jacob Laursen 92145428df Update license headers to 2024 (#16168)
* Update copyright year in configuration
* Update license headers
* Manually update nibeheatpump headers (.cpp/.h/.ino)
* Manually update smsmodem header
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Signed-off-by: Jacob Laursen <jacob-github@vindvejr.dk>
Signed-off-by: Ciprian Pascu <contact@ciprianpascu.ro>
2025-01-02 09:48:23 +02:00
..
src Update license headers to 2024 (#16168) 2025-01-02 09:48:23 +02:00
NOTICE
pom.xml Apply spotless after release (#16097) 2023-12-22 23:30:38 +01:00
README.md

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.