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Reject invalid Executor's RejectedExecutionHandlers
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src/test/java/com/pivovarit/collectors/ExecutorValidationTest.java
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package com.pivovarit.collectors; | ||
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import org.junit.jupiter.api.DynamicTest; | ||
import org.junit.jupiter.api.TestFactory; | ||
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import java.util.Collection; | ||
import java.util.List; | ||
import java.util.concurrent.ExecutorService; | ||
import java.util.concurrent.SynchronousQueue; | ||
import java.util.concurrent.ThreadPoolExecutor; | ||
import java.util.concurrent.TimeUnit; | ||
import java.util.function.Function; | ||
import java.util.stream.Collector; | ||
import java.util.stream.Stream; | ||
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import static java.util.stream.Stream.of; | ||
import static org.assertj.core.api.Assertions.assertThatThrownBy; | ||
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class ExecutorValidationTest { | ||
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@TestFactory | ||
Stream<DynamicTest> shouldStartProcessingElementsTests() { | ||
return of( | ||
shouldRejectInvalidRejectedExecutionHandler(e -> ParallelCollectors.parallel(i -> i, e, 2), "parallel"), | ||
shouldRejectInvalidRejectedExecutionHandler(e -> ParallelCollectors.parallelToStream(i -> i, e, 2), "parallelToStream"), | ||
shouldRejectInvalidRejectedExecutionHandler(e -> ParallelCollectors.parallelToOrderedStream(i -> i, e, 2), "parallelToOrderedStream"), | ||
shouldRejectInvalidRejectedExecutionHandler(e -> ParallelCollectors.Batching.parallel(i -> i, e, 2), "parallel (batching)"), | ||
shouldRejectInvalidRejectedExecutionHandler(e -> ParallelCollectors.Batching.parallelToStream(i -> i, e, 2), "parallelToStream (batching)"), | ||
shouldRejectInvalidRejectedExecutionHandler(e -> ParallelCollectors.Batching.parallelToOrderedStream(i -> i, e, 2), "parallelToOrderedStream (batching)") | ||
).flatMap(Collection::stream); | ||
} | ||
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private static List<DynamicTest> shouldRejectInvalidRejectedExecutionHandler(Function<ExecutorService, Collector<Integer, ?, ?>> collector, String name) { | ||
return Stream.of(new ThreadPoolExecutor.DiscardOldestPolicy(), new ThreadPoolExecutor.DiscardPolicy()) | ||
.map(dp -> DynamicTest.dynamicTest(name + " : " + dp.getClass().getSimpleName(), () -> { | ||
try (var e = new ThreadPoolExecutor(2, 2000, 0, TimeUnit.MILLISECONDS, new SynchronousQueue<>(), new ThreadPoolExecutor.DiscardOldestPolicy())) { | ||
assertThatThrownBy(() -> Stream.of(1, 2, 3).collect(collector.apply(e))) | ||
.isExactlyInstanceOf(IllegalArgumentException.class); | ||
} | ||
})).toList(); | ||
} | ||
} |