public class ProcTimeRangeBoundedPrecedingFunction<K> extends KeyedProcessFunction<K,RowData,RowData>
E.g.: SELECT currtime, b, c, min(c) OVER (PARTITION BY b ORDER BY proctime RANGE BETWEEN INTERVAL '4' SECOND PRECEDING AND CURRENT ROW), max(c) OVER (PARTITION BY b ORDER BY proctime RANGE BETWEEN INTERVAL '4' SECOND PRECEDING AND CURRENT ROW) FROM T.
KeyedProcessFunction.Context, KeyedProcessFunction.OnTimerContext
Constructor and Description |
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ProcTimeRangeBoundedPrecedingFunction(GeneratedAggsHandleFunction genAggsHandler,
LogicalType[] accTypes,
LogicalType[] inputFieldTypes,
long precedingTimeBoundary) |
Modifier and Type | Method and Description |
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void |
close()
Tear-down method for the user code.
|
void |
onTimer(long timestamp,
KeyedProcessFunction.OnTimerContext ctx,
Collector<RowData> out)
Called when a timer set using
TimerService fires. |
void |
open(OpenContext openContext)
Initialization method for the function.
|
void |
processElement(RowData input,
KeyedProcessFunction.Context ctx,
Collector<RowData> out)
Process one element from the input stream.
|
getIterationRuntimeContext, getRuntimeContext, open, setRuntimeContext
public ProcTimeRangeBoundedPrecedingFunction(GeneratedAggsHandleFunction genAggsHandler, LogicalType[] accTypes, LogicalType[] inputFieldTypes, long precedingTimeBoundary)
public void open(OpenContext openContext) throws Exception
RichFunction
The openContext object passed to the function can be used for configuration and initialization. The openContext contains some necessary information that were configured on the function in the program composition.
public class MyFilter extends RichFilterFunction<String> {
private String searchString;
public void open(OpenContext openContext) {
// initialize the value of searchString
}
public boolean filter(String value) {
return value.equals(searchString);
}
}
By default, this method does nothing.
1. If you implement open(OpenContext openContext)
, the open(OpenContext
openContext)
will be invoked and the open(Configuration parameters)
won't be
invoked. 2. If you don't implement open(OpenContext openContext)
, the open(Configuration parameters)
will be invoked in the default implementation of the open(OpenContext openContext)
.
openContext
- The context containing information about the context in which the function
is opened.Exception
- Implementations may forward exceptions, which are caught by the runtime.
When the runtime catches an exception, it aborts the task and lets the fail-over logic
decide whether to retry the task execution.public void processElement(RowData input, KeyedProcessFunction.Context ctx, Collector<RowData> out) throws Exception
KeyedProcessFunction
This function can output zero or more elements using the Collector
parameter and
also update internal state or set timers using the KeyedProcessFunction.Context
parameter.
processElement
in class KeyedProcessFunction<K,RowData,RowData>
input
- The input value.ctx
- A KeyedProcessFunction.Context
that allows querying the timestamp of the element and getting a
TimerService
for registering timers and querying the time. The context is only
valid during the invocation of this method, do not store it.out
- The collector for returning result values.Exception
- This method may throw exceptions. Throwing an exception will cause the
operation to fail and may trigger recovery.public void onTimer(long timestamp, KeyedProcessFunction.OnTimerContext ctx, Collector<RowData> out) throws Exception
KeyedProcessFunction
TimerService
fires.onTimer
in class KeyedProcessFunction<K,RowData,RowData>
timestamp
- The timestamp of the firing timer.ctx
- An KeyedProcessFunction.OnTimerContext
that allows querying the timestamp, the TimeDomain
, and the key of the firing timer and getting a TimerService
for
registering timers and querying the time. The context is only valid during the invocation
of this method, do not store it.out
- The collector for returning result values.Exception
- This method may throw exceptions. Throwing an exception will cause the
operation to fail and may trigger recovery.public void close() throws Exception
RichFunction
This method can be used for clean up work.
close
in interface RichFunction
close
in class AbstractRichFunction
Exception
- Implementations may forward exceptions, which are caught by the runtime.
When the runtime catches an exception, it aborts the task and lets the fail-over logic
decide whether to retry the task execution.Copyright © 2014–2024 The Apache Software Foundation. All rights reserved.