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| 1 | +/* |
| 2 | + * Copyright 2017 the original author or authors. |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + * |
| 10 | + * Unless required by applicable law or agreed to in writing, software |
| 11 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + */ |
| 16 | +package workshop; |
| 17 | + |
| 18 | +import reactor.core.publisher.Mono; |
| 19 | +import reactor.test.StepVerifier; |
| 20 | + |
| 21 | +import org.junit.Test; |
| 22 | + |
| 23 | +/** |
| 24 | + * Tests to handle error cases. |
| 25 | + * |
| 26 | + * @author Mark Paluch |
| 27 | + */ |
| 28 | +public class Step5ErrorHandling { |
| 29 | + |
| 30 | + @Test |
| 31 | + public void monoShouldEmitAFallbackValueOnError() { |
| 32 | + |
| 33 | + Mono<String> failedMono = Mono.error(new IllegalStateException("Something bad happened!")); |
| 34 | + |
| 35 | + String recoveryValue = "Recovered!"; |
| 36 | + |
| 37 | + // TODO: Replace this line with a fallback value in an error happens |
| 38 | + Mono<String> withErrorHandling = failedMono; |
| 39 | + |
| 40 | + StepVerifier.create(withErrorHandling).expectNext("Recovered!").verifyComplete(); |
| 41 | + } |
| 42 | + |
| 43 | + @Test |
| 44 | + public void monoShouldEmitADeferredFallbackValueOnError() { |
| 45 | + |
| 46 | + Mono<String> failedMono = Mono.error(new IllegalStateException("Something bad happened!")); |
| 47 | + |
| 48 | + Mono<String> recoveryValue = Mono.just("Recovered!"); |
| 49 | + |
| 50 | + // TODO: Replace this line with a fallback that is computed in a deferred way |
| 51 | + Mono<String> withErrorHandling = failedMono; |
| 52 | + |
| 53 | + StepVerifier.create(withErrorHandling).expectNext("Recovered!").verifyComplete(); |
| 54 | + } |
| 55 | + |
| 56 | + @Test |
| 57 | + public void monoShouldEmitAFallbackValueIfEmpty() { |
| 58 | + |
| 59 | + Mono<String> emptyMono = Mono.empty(); |
| 60 | + |
| 61 | + Mono<String> recoveryValue = Mono.just("Recovered!"); |
| 62 | + |
| 63 | + // TODO: Replace this line with a fallback that is computed in a deferred way |
| 64 | + Mono<String> withErrorHandling = emptyMono; |
| 65 | + |
| 66 | + StepVerifier.create(withErrorHandling).expectNext("Recovered!").verifyComplete(); |
| 67 | + } |
| 68 | + |
| 69 | + @Test |
| 70 | + public void monoShouldTranslateException() { |
| 71 | + |
| 72 | + Mono<String> failedMono = Mono.error(new IllegalStateException("Something bad happened!")); |
| 73 | + |
| 74 | + // TODO: Replace this line with a Mono translating IllegalStateException to MyBusinessException |
| 75 | + Mono<String> withErrorHandling = failedMono; |
| 76 | + |
| 77 | + StepVerifier.create(withErrorHandling).expectError(MyBusinessException.class).verify(); |
| 78 | + } |
| 79 | + |
| 80 | + static class MyBusinessException extends Exception { |
| 81 | + |
| 82 | + public MyBusinessException(Throwable cause) { |
| 83 | + super(cause); |
| 84 | + } |
| 85 | + } |
| 86 | +} |
32BD
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