Odysseus provides a simply feature for storing, retrieving and removing of values from a key value store.
Out of the box, odysseus provides
A store can be created with theĀ Odysseus Script command: #CREATE_KV_STORE name type (PARAM_1_KEY=PARAM_1_VALUE,..., PARAM_N_KEY=PARAM_N_VALUE)
To create a Memory Store simply use:
#CREATE_KV_STORE test MemoryStore |
Some stores have parameters, e.g. the FileStore (with the paramter filename):
#CREATE_KV_STORE test FileStore (filename=c:/temp/tmp.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)
The following code block shows an example
#PARSER PQL #RUNQUERY timer = TIMER({ period = 1000, source = 'timersource' } ) Map1 = MAP({EXPRESSIONS = ['time','kvwrite("test2","Time",time)','kvread("test2", "Time")']}, timer) |