kileys commented on a change in pull request #15475:
URL: https://github.com/apache/beam/pull/15475#discussion_r705654773
##########
File path:
sdks/java/harness/src/main/java/org/apache/beam/fn/harness/state/StateFetchingIterators.java
##########
@@ -195,8 +245,17 @@ public ByteString firstPage() {
this.continuationToken =
stateRequestForFirstChunk.getGet().getContinuationToken();
}
- private void prefetch() {
- if (prefetchedResponse == null && currentState == State.READ_REQUIRED) {
+ @Override
+ public boolean isReady() {
+ if (prefetchedResponse == null) {
+ return currentState != State.READ_REQUIRED;
+ }
+ return prefetchedResponse.isDone();
+ }
+
+ @Override
+ public void prefetch() {
+ if (!isReady()) {
prefetchedResponse = new CompletableFuture<>();
Review comment:
Is there a risk of overriding an ongoing prefetch? Do we need to check
that prefetchedResponse is null?
##########
File path:
sdks/java/harness/src/test/java/org/apache/beam/fn/harness/state/StateFetchingIteratorsTest.java
##########
@@ -19,29 +19,72 @@
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import java.util.ArrayList;
import java.util.Arrays;
-import java.util.Iterator;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;
+import
org.apache.beam.fn.harness.state.StateFetchingIterators.FirstPageAndRemainder;
import
org.apache.beam.fn.harness.state.StateFetchingIterators.LazyBlockingStateFetchingIterator;
import org.apache.beam.model.fnexecution.v1.BeamFnApi.StateGetResponse;
import org.apache.beam.model.fnexecution.v1.BeamFnApi.StateRequest;
import org.apache.beam.model.fnexecution.v1.BeamFnApi.StateResponse;
import org.apache.beam.sdk.coders.Coder;
import org.apache.beam.sdk.coders.CoderException;
import org.apache.beam.sdk.coders.VarIntCoder;
+import org.apache.beam.sdk.fn.stream.PrefetchableIterable;
+import org.apache.beam.sdk.fn.stream.PrefetchableIterator;
import org.apache.beam.sdk.util.CoderUtils;
import org.apache.beam.vendor.grpc.v1p36p0.com.google.protobuf.ByteString;
import
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.Iterables;
-import
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.Iterators;
import org.junit.Test;
+import org.junit.experimental.runners.Enclosed;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/** Tests for {@link StateFetchingIterators}. */
+@RunWith(Enclosed.class)
public class StateFetchingIteratorsTest {
+
+ private static BeamFnStateClient fakeStateClient(
Review comment:
https://github.com/apache/beam/blob/master/sdks/java/harness/src/test/java/org/apache/beam/fn/harness/state/FakeBeamFnStateClient.java
?
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