com.google.cloud.dataflow.sdk.util.state

Class WindmillStateReader

java.lang.Object

com.google.cloud.dataflow.sdk.util.state.WindmillStateReader

public class WindmillStateReader
extends Object

Reads persistent state from Windmill. Returns Futures containing the data that has been read. Will not initiate a read until Future.get() is called, at which point all the pending futures will be read.

Constructor Summary

Constructors

Constructor and Description
WindmillStateReader(MetricTrackingWindmillServerStub metrics, String computation, com.google.protobuf.ByteString key, long workToken)

Method Summary

Modifier and Type	Method and Description
<T> Future<Iterable<T>>	listFuture(com.google.protobuf.ByteString encodedTag, String stateFamily, Coder<T> elemCoder)
void	startBatchAndBlock()
<T> Future<T>	valueFuture(com.google.protobuf.ByteString encodedTag, String stateFamily, Coder<T> coder)
Future<org.joda.time.Instant>	watermarkFuture(com.google.protobuf.ByteString encodedTag, String stateFamily)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

WindmillStateReader

public WindmillStateReader(MetricTrackingWindmillServerStub metrics,
                           String computation,
                           com.google.protobuf.ByteString key,
                           long workToken)

Method Detail

watermarkFuture

public Future<org.joda.time.Instant> watermarkFuture(com.google.protobuf.ByteString encodedTag,
                                                     String stateFamily)

valueFuture

public <T> Future<T> valueFuture(com.google.protobuf.ByteString encodedTag,
                                 String stateFamily,
                                 Coder<T> coder)

listFuture

public <T> Future<Iterable<T>> listFuture(com.google.protobuf.ByteString encodedTag,
                                          String stateFamily,
                                          Coder<T> elemCoder)

startBatchAndBlock

public void startBatchAndBlock()