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KTLN-877 - Update article "Parallel Operations on Kotlin Collections" #978

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Merged
merged 9 commits into from
Jul 29, 2024
Merged

KTLN-877 - Update article "Parallel Operations on Kotlin Collections" #978

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03827f6
update with flows
Jun 25, 2024
5230783
remove ExecutorService
Jun 25, 2024
70f3eb0
add thread.sleep()
Jun 25, 2024
5547e28
update rx java and remove executor
hangga Jul 13, 2024
d367426
skip
hangga Jul 13, 2024
702d8d3
Thread.sleep(1500)
hangga Jul 14, 2024
0d7a4f5
cleanup
hangga Jul 14, 2024
9d3cbed
remove sleep and update executor
hangga Jul 27, 2024
0974686
update call flowOn(Dispatchers.IO) before the flatMapMerge
hangga Jul 27, 2024
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45 changes: 24 additions & 21 deletions ...kotlin/com/baeldung/parallelOperationsCollections/ParallelOperationCollectionsUnitTest.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -3,18 +3,16 @@ package com.baeldung.parallelOperationsCollections
import io.reactivex.rxjava3.core.Observable
import io.reactivex.rxjava3.kotlin.toObservable
import io.reactivex.rxjava3.schedulers.Schedulers
import kotlinx.coroutines.ExperimentalCoroutinesApi
import kotlinx.coroutines.async
import kotlinx.coroutines.awaitAll
import kotlinx.coroutines.*
import kotlinx.coroutines.flow.*
import kotlinx.coroutines.runBlocking
import org.assertj.core.api.Assertions.assertThat
import org.junit.jupiter.api.Test
import org.slf4j.LoggerFactory
import java.time.Duration
import java.time.Instant
import java.util.concurrent.Callable
import java.util.concurrent.Executors
import java.util.concurrent.Future
import java.util.stream.Collectors


Expand Down Expand Up @@ -46,7 +44,7 @@ class ParallelOperationCollectionsUnitTest {
this.isAdult = this.age >= 18
logger.info(this.toString())
}

private fun Instant.printTotalTime() {
val totalTime = Duration.between(this, Instant.now()).toMillis()
logger.info("Total time taken: {} ms", totalTime)
Expand All @@ -59,7 +57,7 @@ class ParallelOperationCollectionsUnitTest {

val filteredPeople = people
.map { person ->
async {
async(Dispatchers.IO) {
person.setAdult()
person
}
Expand All @@ -79,14 +77,11 @@ class ParallelOperationCollectionsUnitTest {
val startTime = Instant.now()

val filteredPeople = people.asFlow()
.flowOn(Dispatchers.IO)
.flatMapMerge { person ->
flow {
emit(
async {
person.setAdult()
person
}.await()
)
person.setAdult()
emit(person)
}
}
.filter { it.age > 15 }.toList()
Expand All @@ -105,9 +100,11 @@ class ParallelOperationCollectionsUnitTest {
val observable = Observable.fromIterable(people)
.flatMap(
{
Observable.just(it).subscribeOn(Schedulers.computation()).doOnNext { person ->
person.setAdult()
}
Observable.just(it)
.subscribeOn(Schedulers.computation())
.doOnNext { person ->
person.setAdult()
}
}, people.size // Uses maxConcurrency for the number of elements
)
.filter { it.age > 15 }
Expand All @@ -128,9 +125,11 @@ class ParallelOperationCollectionsUnitTest {
val observable = people.toObservable()
.flatMap(
{
Observable.just(it).subscribeOn(Schedulers.computation()).doOnNext { person ->
person.setAdult()
}
Observable.just(it)
.subscribeOn(Schedulers.computation())
.doOnNext { person ->
person.setAdult()
}
}, people.size // Uses maxConcurrency for the number of elements
).filter { it.age > 15 }
.toList()
Expand Down Expand Up @@ -166,21 +165,25 @@ class ParallelOperationCollectionsUnitTest {
val startTime = Instant.now()

val executor = Executors.newFixedThreadPool(people.size)
val futures = people
val futures: List<Future<Person>> = people
.map { person ->
executor.submit(Callable {
person.setAdult()
person
}).get()
})
}

val results = futures
.map { it.get() }
.filter { it.age > 15 }
.sortedBy { it.age }

executor.shutdown()

startTime.printTotalTime()

futures.assertOver15AndSortedByAge()
results.assertOver15AndSortedByAge()
}

}