org.apache.flink.table.runtime.operators.window

Interface MergeCallback<W,R>

Type Parameters:

W - The type Window for windows or the type Long for slices that this callback used to merge.

R - The result type like Collection or Iterable to specify which slices or windows should be merged.

All Known Implementing Classes:

SliceSharedWindowAggProcessor

public interface MergeCallback<W,R>

Callback to be used in when merging slices or windows for specifying which slices or windows should be merged.

Method Summary

Modifier and Type	Method and Description
void	merge(W mergeResult, R toBeMerged) Specifies that states of the given windows or slices should be merged into the result window or slice.

Method Detail

merge

void merge(@Nullable
           W mergeResult,
           R toBeMerged)
    throws Exception

Specifies that states of the given windows or slices should be merged into the result window or slice.

Parameters:

mergeResult - The resulting merged window or slice, null if it represents a non-state namespace.

toBeMerged - Windows or slices that should be merged into one window or slice.

Throws:

Exception