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AppendOnlyPersistentMapBase.allPersisted no longer loads everything into memory at once (#5286)

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As a general purpose API, allPersisted should not be loading the entire contents of the database table into memory. Instead now it returns a Stream for processing of elements.
This commit is contained in:
Shams Asari
2019-07-10 18:09:02 +01:00
committed by GitHub
parent 76631132ca
commit 49cda57c81
10 changed files with 66 additions and 48 deletions
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6
core/src/main/kotlin/net/corda/core/internal/InternalUtils.kt
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@ -45,12 +45,15 @@ import java.util.*
import java.util.Spliterator.*
import java.util.concurrent.ExecutorService
import java.util.concurrent.TimeUnit
import java.util.stream.Collectors
import java.util.stream.Collectors.toCollection
import java.util.stream.IntStream
import java.util.stream.Stream
import java.util.stream.StreamSupport
import java.util.zip.Deflater
import java.util.zip.ZipEntry
import java.util.zip.ZipOutputStream
import kotlin.collections.LinkedHashSet
import kotlin.reflect.KClass
import kotlin.reflect.full.createInstance
@ -273,6 +276,9 @@ inline fun <T, R : Any> Stream<T>.mapNotNull(crossinline transform: (T) -> R?):
}
}
/** Similar to [Collectors.toSet] except the Set is guaranteed to be ordered. */
fun <T> Stream<T>.toSet(): Set<T> = collect(toCollection { LinkedHashSet<T>() })
fun <T> Class<T>.castIfPossible(obj: Any): T? = if (isInstance(obj)) cast(obj) else null
/** Returns a [DeclaredField] wrapper around the declared (possibly non-public) static field of the receiver [Class]. */