Package org.apache.storm.windowing
Class TupleWindowIterImpl
java.lang.Object
org.apache.storm.windowing.TupleWindowIterImpl
- All Implemented Interfaces:
TupleWindow
,Window<Tuple>
An iterator based implementation over the events in a window.
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionget()
Gets the list of events in the window.If processing based on event time, returns the window end time based on watermark otherwise returns the window end time based on processing time.Get the list of events expired from the window since the last time the window was generated.getIter()
Returns an iterator over the events in the window.getNew()
Get the list of newly added events in the window since the last time the window was generated.Returns the window start timestamp.
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Constructor Details
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TupleWindowIterImpl
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Method Details
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get
Description copied from interface:Window
Gets the list of events in the window.Note: If the number of tuples in windows is huge, invoking
get
would load all the tuples into memory and may throw an OOM exception. Use windowing with persistence (BaseStatefulWindowedBolt.withPersistence()
) andWindow.getIter()
to retrieve an iterator over the events in the window. -
getIter
Description copied from interface:Window
Returns an iterator over the events in the window.Note: This is only supported when using windowing with persistence
BaseStatefulWindowedBolt.withPersistence()
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getNew
Description copied from interface:Window
Get the list of newly added events in the window since the last time the window was generated.Note: This is not supported when using windowing with persistence (
BaseStatefulWindowedBolt.withPersistence()
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getExpired
Description copied from interface:Window
Get the list of events expired from the window since the last time the window was generated.Note: This is not supported when using windowing with persistence (
BaseStatefulWindowedBolt.withPersistence()
).- Specified by:
getExpired
in interfaceWindow<Tuple>
- Returns:
- the list of events expired from the window.
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getEndTimestamp
Description copied from interface:Window
If processing based on event time, returns the window end time based on watermark otherwise returns the window end time based on processing time.- Specified by:
getEndTimestamp
in interfaceWindow<Tuple>
- Returns:
- the window end timestamp
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getStartTimestamp
Description copied from interface:Window
Returns the window start timestamp. Will return null if the window length is not based on time duration.- Specified by:
getStartTimestamp
in interfaceWindow<Tuple>
- Returns:
- the window start timestamp or null if the window length is not time based
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