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Unit tests for streams manager #45090

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johnny-schmidt
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What

  • Unit tests for the streams manager
  • Removed all unnecessary/unused behavior
    • tracking bytes read per stream
  • Replaced java countdown latch with idiomatic kotlin "unit-channel-as-barrier"
  • Guards against irrational states
    • no counting after end-of-stream
    • no closing before end-of-stream
    • batch processing completeness requires end-of-stream
  • Test refactor: Moved commonly-used catalog mock to its own class (@Named)
  • YES 💚
  • NO ❌

@johnny-schmidt johnny-schmidt requested a review from a team as a code owner September 2, 2024 20:06
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@octavia-squidington-iii octavia-squidington-iii added the CDK Connector Development Kit label Sep 2, 2024
@johnny-schmidt johnny-schmidt force-pushed the issue-9615/load-cdk-unit-tests-streams-manager branch from 322e28a to 8a98da0 Compare September 2, 2024 20:07
Base automatically changed from issue-9615/load-cdk-unit-tests-state-manager to master September 3, 2024 21:45
@johnny-schmidt johnny-schmidt force-pushed the issue-9615/load-cdk-unit-tests-streams-manager branch from 8a98da0 to d635c2c Compare September 3, 2024 21:48
@@ -33,68 +35,98 @@ class DefaultStreamsManager(
return streamManagers[stream] ?: throw IllegalArgumentException("Stream not found: $stream")
}

override suspend fun awaitAllStreamsComplete() {
override suspend fun awaitAllStreamsClosed() {
streamManagers.forEach { (_, manager) -> manager.awaitStreamClosed() }
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TODO: error handling

* Count the end-of-stream. Expect this exactly once. Expect no further `countRecordIn`, and
* expect that `markClosed` will always occur after this.
*/
fun countEndOfStream(): Long
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that's a weird name. I'm not really sure what "counting the end of stream" means. Total number of records in the stream?

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I understand when reading further.
I think the notion of "counting" is off here. I don't expect count to increment a counter. We can leave it as is for now

streamManagers.forEach { (_, manager) -> manager.awaitStreamClosed() }
}
}

/** Manages the state of a single stream. */
interface StreamManager {
fun countRecordIn(sizeBytes: Long): Long
/** Count incoming record and return the record's *index*. */
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It looks to me like most of the functions here are setting state on the stream itself. Maybe this is just part of a Stream?

listOf(
Pair(stream1, SetRecordCount(10)),
Pair(stream1, AddPersisted(0, 9)),
Pair(stream1, ExpectPersistedUntil(9)),
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this is a bit confusing. Is the persistedUntil the message number or message count?

@johnny-schmidt johnny-schmidt merged commit af58faa into master Sep 3, 2024
31 checks passed
@johnny-schmidt johnny-schmidt deleted the issue-9615/load-cdk-unit-tests-streams-manager branch September 3, 2024 23:28
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3 participants