@InterfaceStability.Unstable public class StreamBuilder extends Object
A builder for constructing a StormTopology via storm streams api (DSL).
| Constructor and Description |
|---|
StreamBuilder()
Creates a new
StreamBuilder. |
| Modifier and Type | Method and Description |
|---|---|
StormTopology |
build()
Builds a new
StormTopology for the computation expressed via the stream api. |
Stream<Tuple> |
newStream(IRichSpout spout)
Creates a new
Stream of tuples from the given IRichSpout. |
Stream<Tuple> |
newStream(IRichSpout spout,
int parallelism)
Creates a new
Stream of tuples from the given IRichSpout with the given parallelism. |
<K,V> PairStream<K,V> |
newStream(IRichSpout spout,
PairValueMapper<K,V> pairValueMapper)
Creates a new
PairStream of key-value pairs from the given IRichSpout by extracting key and value from tuples via the supplied PairValueMapper. |
<K,V> PairStream<K,V> |
newStream(IRichSpout spout,
PairValueMapper<K,V> pairValueMapper,
int parallelism)
Creates a new
PairStream of key-value pairs from the given IRichSpout by extracting key and value from tuples via the supplied PairValueMapper and with the given value of parallelism. |
<T> Stream<T> |
newStream(IRichSpout spout,
TupleValueMapper<T> valueMapper)
Creates a new
Stream of values from the given IRichSpout by extracting field(s) from tuples via the supplied TupleValueMapper. |
<T> Stream<T> |
newStream(IRichSpout spout,
TupleValueMapper<T> valueMapper,
int parallelism)
Creates a new
Stream of values from the given IRichSpout by extracting field(s) from tuples via the supplied TupleValueMapper with the given parallelism. |
public StreamBuilder()
Creates a new StreamBuilder.
public Stream<Tuple> newStream(IRichSpout spout)
Creates a new Stream of tuples from the given IRichSpout.
spout - the spoutpublic Stream<Tuple> newStream(IRichSpout spout, int parallelism)
Creates a new Stream of tuples from the given IRichSpout with the given parallelism.
spout - the spoutparallelism - the parallelism of the streampublic <T> Stream<T> newStream(IRichSpout spout, TupleValueMapper<T> valueMapper)
Creates a new Stream of values from the given IRichSpout by extracting field(s) from tuples via the supplied TupleValueMapper.
spout - the spoutvalueMapper - the value mapperT - the type of values in the resultant streampublic <T> Stream<T> newStream(IRichSpout spout, TupleValueMapper<T> valueMapper, int parallelism)
Creates a new Stream of values from the given IRichSpout by extracting field(s) from tuples via the supplied TupleValueMapper with the given parallelism.
spout - the spoutvalueMapper - the value mapperparallelism - the parallelism of the streamT - the type of values in the resultant streampublic <K,V> PairStream<K,V> newStream(IRichSpout spout, PairValueMapper<K,V> pairValueMapper)
Creates a new PairStream of key-value pairs from the given IRichSpout by extracting key and value from tuples via the supplied PairValueMapper.
spout - the spoutpairValueMapper - the pair value mapperK - the key typeV - the value typepublic <K,V> PairStream<K,V> newStream(IRichSpout spout, PairValueMapper<K,V> pairValueMapper, int parallelism)
Creates a new PairStream of key-value pairs from the given IRichSpout by extracting key and value from tuples via the supplied PairValueMapper and with the given value of parallelism.
spout - the spoutpairValueMapper - the pair value mapperparallelism - the parallelism of the streamK - the key typeV - the value typepublic StormTopology build()
Builds a new StormTopology for the computation expressed via the stream api.
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