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Andreas Huber
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2 changes: 1 addition & 1 deletion
2
reactor-core/src/main/java/reactor/core/publisher/MonoSingleOptionalCallable.java
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141 changes: 141 additions & 0 deletions
141
reactor-core/src/test/java/reactor/core/publisher/MonoSingleOptionalCallableTest.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,141 @@ | ||
| /* | ||
| * Copyright (c) 2021-2023 VMware Inc. or its affiliates, All Rights Reserved. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * https://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
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| package reactor.core.publisher; | ||
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| import static org.assertj.core.api.Assertions.assertThat; | ||
| import static org.assertj.core.api.Assertions.assertThatCode; | ||
| import static org.assertj.core.api.Assertions.assertThatExceptionOfType; | ||
| import static org.junit.jupiter.api.Assertions.assertEquals; | ||
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| import java.time.Duration; | ||
| import java.util.Optional; | ||
| import java.util.concurrent.Callable; | ||
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| import org.junit.jupiter.api.Test; | ||
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| import reactor.core.Fuseable; | ||
| import reactor.core.Scannable; | ||
| import reactor.test.StepVerifier; | ||
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| class MonoSingleOptionalCallableTest { | ||
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| @Test | ||
| void testCallableFusedEmptySource() { | ||
| Mono<Optional<Integer>> mono = Mono | ||
| .<Integer>fromSupplier(() -> null) | ||
| .singleOptional(); | ||
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| StepVerifier.create(mono) | ||
| .expectNext(Optional.empty()) | ||
| .verifyComplete(); | ||
| } | ||
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| @Test | ||
| void testCallableFusedSingleEmptySourceOnBlock() { | ||
| Mono<Optional<Integer>> mono = Mono | ||
| .<Integer>fromSupplier(() -> null) | ||
| .singleOptional(); | ||
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| assertEquals(Optional.empty(), mono.block()); | ||
| } | ||
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| @Test | ||
| void testCallableFusedSingleEmptySourceOnCall() throws Exception { | ||
| Mono<Optional<Integer>> mono = Mono | ||
| .<Integer>fromSupplier(() -> null) | ||
| .singleOptional(); | ||
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| assertThat(mono).isInstanceOf(MonoSingleOptionalCallable.class); | ||
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| assertEquals(Optional.empty(), ((Callable<?>) mono).call()); | ||
| } | ||
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| @Test | ||
| void sourceNull() { | ||
| assertThatExceptionOfType(NullPointerException.class).isThrownBy(() -> { | ||
| new MonoSingleOptionalCallable<>(null); | ||
| }); | ||
| } | ||
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| @Test | ||
| void normal() { | ||
| StepVerifier.create(new MonoSingleOptionalCallable<>(() -> 1)) | ||
| .expectNext(Optional.of(1)) | ||
| .verifyComplete(); | ||
| } | ||
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| @Test | ||
| void normalBackpressured() { | ||
| StepVerifier.create(new MonoSingleOptionalCallable<>(() -> 1), 0) | ||
| .expectSubscription() | ||
| .expectNoEvent(Duration.ofMillis(50)) | ||
| .thenRequest(1) | ||
| .expectNext(Optional.of(1)) | ||
| .verifyComplete(); | ||
| } | ||
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| //scalarCallable empty/error/just are not instantiating MonoSingleOptionalCallable and are covered in MonoSingleTest | ||
| //we still cover the case where a callable source throws | ||
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| @Test | ||
| void failingCallable() { | ||
| StepVerifier.create(new MonoSingleOptionalCallable<>(() -> { throw new IllegalStateException("test"); } )) | ||
| .verifyErrorMessage("test"); | ||
| } | ||
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| @Test | ||
| void emptyCallable() { | ||
| StepVerifier.create(new MonoSingleOptionalCallable<>(() -> null)) | ||
| .expectNext(Optional.empty()) | ||
| .verifyComplete(); | ||
| } | ||
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| @Test | ||
| void valuedCallable() { | ||
| @SuppressWarnings("unchecked") | ||
| Callable<Integer> fluxCallable = (Callable<Integer>) Mono.fromCallable(() -> 1).flux(); | ||
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| StepVerifier.create(new MonoSingleOptionalCallable<>(fluxCallable)) | ||
| .expectNext(Optional.of(1)) | ||
| .verifyComplete(); | ||
| } | ||
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| @Test | ||
| void fusionMonoSingleOptionalCallableDoesntTriggerFusion() { | ||
| Mono<Optional<Integer>> fusedCase = Mono | ||
| .fromCallable(() -> 1) | ||
| .singleOptional(); | ||
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| assertThat(fusedCase) | ||
| .as("fusedCase assembly check") | ||
| .isInstanceOf(MonoSingleOptionalCallable.class) | ||
| .isNotInstanceOf(Fuseable.class); | ||
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| assertThatCode(() -> fusedCase.filter(v -> true).block()) | ||
| .as("fusedCase fused") | ||
| .doesNotThrowAnyException(); | ||
| } | ||
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| @Test | ||
| void scanOperator(){ | ||
| MonoSingleOptionalCallable<String> test = new MonoSingleOptionalCallable<>(() -> "foo"); | ||
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| assertThat(test.scan(Scannable.Attr.RUN_STYLE)).isSameAs(Scannable.Attr.RunStyle.SYNC); | ||
| } | ||
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| } |
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