T
- public final class SourceBuilder.Batch<T> extends Object
Modifier and Type | Method and Description |
---|---|
BatchSource<T> |
build()
Builds and returns the batch source.
|
SourceBuilder.Batch<T> |
destroyFn(DistributedConsumer<? super S> destroyFn)
Sets the function that Jet will call when cleaning up after a job has
ended.
|
SourceBuilder.Batch<T> |
distributed(int preferredLocalParallelism)
Declares that you're creating a distributed source.
|
<T_NEW> SourceBuilder.Batch<T_NEW> |
fillBufferFn(DistributedBiConsumer<? super S,? super SourceBuilder.SourceBuffer<T_NEW>> fillBufferFn)
Sets the function that Jet will call whenever it needs more data from
your source.
|
@Nonnull public <T_NEW> SourceBuilder.Batch<T_NEW> fillBufferFn(@Nonnull DistributedBiConsumer<? super S,? super SourceBuilder.SourceBuffer<T_NEW>> fillBufferFn)
createFn
and Jet's buffer object. It should add some items
to the buffer, ideally those it can produce without making any blocking
calls. On any given invocation the function may also choose not to add
any items. Jet will automatically employ an exponential backoff strategy
to avoid calling your function in a tight loop during a period when
there's no data ready to be emitted.
Once it has emitted all the data, the function must call SourceBuilder.SourceBuffer.close()
.
T_NEW
- type of the emitted itemsfillBufferFn
- function that fills the buffer with source datafillBufferFn
@Nonnull public SourceBuilder.Batch<T> destroyFn(@Nonnull DistributedConsumer<? super S> destroyFn)
@Nonnull public SourceBuilder.Batch<T> distributed(int preferredLocalParallelism)
preferredLocalParallelism
parameter. If you call this, you must
ensure that all the source processors are coordinated and not emitting
duplicated data. The createFn
can consult procContext.totalParallelism()
and procContext.globalProcessorIndex()
. Jet calls createFn
exactly
once with each globalProcessorIndex
from 0 to totalParallelism - 1
, this can help all the instances agree on which
part of the data to emit.preferredLocalParallelism
- requested number of processors on each cluster member@Nonnull public BatchSource<T> build()
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