Page History

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• MemoryStore: A key value store that keep the values in memory only
• FileStore: A key value store that keeps the data in main memory and stores it additionally to disk
• With a plugin you could write to a Redis-Store.

Creating a store

A store can be created with the Odysseus Script command: #CREATE_KV_STORE name type (PARAM_1_KEY=PARAM_1_VALUE,..., PARAM_N_KEY=PARAM_N_VALUE)

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#CREATE_KV_STORE test MemoryStore(createOnlyIfNotExists=false) /// default is true

Access a store

Currently, only MEP functions can be used to read an write from the store. So this can be used in all operators that contain expressions or predicates (e.g. Map operator or Select operator)

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#PARSER PQL
#RUNQUERY
timer = TIMER({
            period = 1000,
            source = 'timersource'
          }
        )

Map1 = MAP({EXPRESSIONS = ['time','kvwrite("test2","Time",time)','kvread("test2", "Time")']}, timer)

You could also use an operator to write to an existing store:

StoreWriter

#PARSER PQL
#RUNQUERY
timer = TIMER({
            period = 1000,
            source = 'timersource'
          }
        )

out = StoreWriter({IdAttribute='time', store="test2")},timer)