feat : handle thread safe issue for getCurrentFutures

[younseunghyun]

📝 Description

improve thread safe issue for getCurrentFutures

current implementation get the values form cachemap for dataloaders.

And make it flatten. But when we get the values it's just iterator, not all the elements is obtained.

So when we run flatten, it traverse the each iterator, and it make ArrayIndexOutOfBoundException

Following is error message

aused by: java.lang.ArrayIndexOutOfBoundsException: Index 279 out of bounds for length 279
	at java.base/java.util.HashMap.valuesToArray(HashMap.java:973)
	at java.base/java.util.HashMap$Values.toArray(HashMap.java:1050)
	at java.base/java.util.ArrayList.addAll(ArrayList.java:670)
	at kotlin.collections.CollectionsKt__MutableCollectionsKt.addAll(MutableCollections.kt:116)
	at kotlin.collections.CollectionsKt__IterablesKt.flatten(Iterables.kt:49)
	at com.expediagroup.graphql.dataloader.KotlinDataLoaderRegistry.getCurrentFutures(KotlinDataLoaderRegistry.kt:67)
	at com.expediagroup.graphql.dataloader.KotlinDataLoaderRegistry.dispatchAll(KotlinDataLoaderRegistry.kt:78)
	at graphql.execution.instrumentation.dataloader.FieldLevelTrackingApproach.dispatch(FieldLevelTrackingApproach.java:242)
	at graphql.execution.instrumentation.dataloader.FieldLevelTrackingApproach$1.onFieldValuesInfo(FieldLevelTrackingApproach.java:150)
	at graphql.execution.AsyncExecutionStrategy.lambda$execute$1(AsyncExecutionStrategy.java:72)
	at java.base/java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:863)
	... 50 common frames omitted

🔗 Related Issues

#1837

[younseunghyun]

@samuelAndalon

[younseunghyun]

there was ktilntFormatting Issue
I refac code and overwrite commit

[samuelAndalon]

Afk right now, once merged can you cherry pick to 6.x.x ?

[younseunghyun]

@samuelAndalon
got it.

[younseunghyun]

@samuelAndalon cherry pick to 6.x.x branch