OH3: Access historic data within ECMA Script

Setup, Configuration and Use Scripts & Rules
7

Sorry Manfred,

I’ve send you in the wrong direction. The documents I referenced and the code I’ve given are intended for DSL scripts. For ECMA script, this is the right way to go:

'use strict';

var logger = Java.type("org.slf4j.LoggerFactory").getLogger("org.openhab.model.script.Rules.Experiments");
var PersistenceExtensions = Java.type("org.openhab.core.persistence.extensions.PersistenceExtensions");
var ZonedDateTime = Java.type("java.time.ZonedDateTime");

var myPersistentItem = ir.getItem("ZW_Switch_Kocher_Power");
logger.info("The pyload is {}", myPersistentItem);

var sinceDate = ZonedDateTime.now().minusHours(5);
var maximumValueSince = PersistenceExtensions.maximumSince(myPersistentItem, sinceDate);

logger.info("Historic item is {}", maximumValueSince);
logger.info("Item name is {}", maximumValueSince.name);
logger.info("Item state is {}", maximumValueSince.state);

I’ve tested the code with one of my items. The key here is to use the PersitenceExtension, which is the javascript object to access historic data of items. The documentation I got from the JavaDoc pages found here:

https://next.openhab.org/javadoc/latest/org/openhab/core/persistence/extensions/persistenceextensions

As you can see, the historic state is an item with name, state and a timestamp.The state has the value, you got from the PersistenceExtension. In you case the maximumSice value.

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