Object -
streams :
TimeBatchWindow
This is a batch (tumbling) time window, that holds events arrived between window time periods, and gets updated for
every window time.
E.g.
from inputStream window timeBatch(5000)
select inputStream.name, inputStream.age, sum(inputStream.age) as sumAge, count() as count
group by inputStream.name => (TeacherOutput [] teachers) {
foreach var t in teachers {
outputStream.publish(t);
}
}
The timeBatch
window should only have one parameter (
Constructor
__init
( function(StreamEvent[]) returns (())
nextProcessPointer, any[] windowParameters)
- nextProcessPointer
function(StreamEvent[]) returns (())
- windowParameters any[]
Methods
The process
function process the incoming events to the events and update the current state of the window.
Returns the events(State) which match with the where condition in the join clause for a given event.
Return current state to be saved as a map of any
typed values.
Restores the saved state which is passed as a map of any
typed values.
Fields
- timeInMilliSeconds int
-
description
- windowParameters any[]
-
description
- nextEmitTime int -1
-
description
- currentEventQueue LinkedList
-
description
- resetEvent StreamEvent?
-
description
- nextProcessPointer
function(StreamEvent[]) returns (())
-
description
- scheduler Scheduler
-
description
Parameters
- parameters any[]
The process
function process the incoming events to the events and update the current state of the window.
Parameters
- streamEvents StreamEvent[]
-
The array of stream events to be processed.
getCandidateEvents
(StreamEvent originEvent, function(map, map) returns (boolean)
conditionFunc, boolean isLHSTrigger)
Returns the events(State) which match with the where condition in the join clause for a given event.
Parameters
- originEvent StreamEvent
-
The event against which the state or the events being held by the window is matched.
- isLHSTrigger boolean - true
-
Specify if the join is triggered when the lhs stream received the events, if so it should be true. Most of the time it is true. In rare cases, where the join is triggered when the rhs stream receives events this should be false.
-
Return Type
([StreamEvent?, StreamEvent?]) Returns an array of 2 element tuples of events. A tuple contains the matching events one from lhs stream and one from rhs stream.
Return current state to be saved as a map of any
typed values.
-
Return Type
(map) A map of
any
typed values.
Restores the saved state which is passed as a map of any
typed values.
Parameters
- state map
-
A map of typed
any
values. This map contains the values to be restored from the persisted data.