io.vavr.control.Try.ofSupplier()方法的使用及代码示例

x33g5p2x  于2022-01-30 转载在 其他  
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本文整理了Java中io.vavr.control.Try.ofSupplier()方法的一些代码示例，展示了Try.ofSupplier()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Try.ofSupplier()方法的具体详情如下：
包路径：io.vavr.control.Try
类名称：Try
方法名：ofSupplier

Try.ofSupplier介绍

[英]Creates a Try of a Supplier.
[中]创建一个供应商的尝试。

代码示例

代码示例来源：origin: resilience4j/resilience4j

@Test
public void shouldDecorateSupplierAndReturnWithException() {
  // Given
  CircuitBreaker circuitBreaker = CircuitBreaker.ofDefaults("testName");
  CircuitBreaker.Metrics metrics = circuitBreaker.getMetrics();
  assertThat(metrics.getNumberOfBufferedCalls()).isEqualTo(0);
  // Given the HelloWorldService throws an exception
  BDDMockito.given(helloWorldService.returnHelloWorld()).willThrow(new RuntimeException("BAM!"));
  //When
  Supplier<String> supplier = CircuitBreaker.decorateSupplier(circuitBreaker, helloWorldService::returnHelloWorld);
  //Then
  Try<String> result = Try.ofSupplier(supplier);
  assertThat(result.isFailure()).isTrue();
  assertThat(result.failed().get()).isInstanceOf(RuntimeException.class);
  assertThat(metrics.getNumberOfBufferedCalls()).isEqualTo(1);
  assertThat(metrics.getNumberOfFailedCalls()).isEqualTo(1);
  assertThat(metrics.getNumberOfSuccessfulCalls()).isEqualTo(0);
  // Then the helloWorldService should be invoked 1 time
  BDDMockito.then(helloWorldService).should(Mockito.times(1)).returnHelloWorld();
}

代码示例来源：origin: resilience4j/resilience4j

@Test
public void shouldConsumeOnFailureEvent() throws Throwable {
  rateLimiter.getEventPublisher()
      .onFailure(event ->
        logger.info(event.getEventType().toString()));
  rateLimiter.executeSupplier(() -> "Hello world");
  Try.ofSupplier(RateLimiter.decorateSupplier(rateLimiter, () -> "Hello world"));
  then(logger).should(times(1)).info("FAILED_ACQUIRE");
}

代码示例来源：origin: resilience4j/resilience4j

@Test
public void shouldConsumeOnCallFinishedEventWhenExecutionIsFinished() throws Exception {
  // Given
  Bulkhead bulkhead = Bulkhead.of("test", config);
  // When
  bulkhead.getEventPublisher()
      .onCallFinished(event ->
          logger.info(event.getEventType().toString()));
  Try.ofSupplier(Bulkhead.decorateSupplier(bulkhead,helloWorldService::returnHelloWorld));
  // Then
  then(logger).should(times(1)).info("CALL_FINISHED");
}

代码示例来源：origin: resilience4j/resilience4j

@Test
public void shouldConsumeOnCallRejectedEvent() {
  // Given
  Bulkhead bulkhead = Bulkhead.of("test", config);
  // When
  bulkhead.getEventPublisher()
      .onCallRejected(event ->
          logger.info(event.getEventType().toString()));
  bulkhead.isCallPermitted();
  Try.ofSupplier(Bulkhead.decorateSupplier(bulkhead,helloWorldService::returnHelloWorld));
  // Then
  then(logger).should(times(1)).info("CALL_REJECTED");
}

代码示例来源：origin: resilience4j/resilience4j

@Test
public void shouldRegisterMetricsWithRetry() throws Throwable {
  //Given
  RetryRegistry retryRegistry = RetryRegistry.ofDefaults();
  Retry retry = retryRegistry.retry("testName");
  metricRegistry.registerAll(RetryMetrics.ofRetryRegistry(retryRegistry));
  // Given the HelloWorldService returns Hello world
  BDDMockito.given(helloWorldService.returnHelloWorld())
      .willThrow(new WebServiceException("BAM!"))
      .willReturn("Hello world")
      .willThrow(new WebServiceException("BAM!"))
      .willThrow(new WebServiceException("BAM!"))
      .willThrow(new WebServiceException("BAM!"));
  // Setup circuitbreaker with retry
  String value1 = retry.executeSupplier(helloWorldService::returnHelloWorld);
  Try.ofSupplier(Retry.decorateSupplier(retry, helloWorldService::returnHelloWorld));
  //Then
  assertThat(value1).isEqualTo("Hello world");
  // Then the helloWorldService should be invoked 1 time
  BDDMockito.then(helloWorldService).should(times(5)).returnHelloWorld();
  assertThat(metricRegistry.getMetrics()).hasSize(4);
  assertThat(metricRegistry.getGauges().get("resilience4j.retry.testName." + SUCCESSFUL_CALLS_WITH_RETRY).getValue()).isEqualTo(1L);
  assertThat(metricRegistry.getGauges().get("resilience4j.retry.testName." + SUCCESSFUL_CALLS_WITHOUT_RETRY).getValue()).isEqualTo(0L);
  assertThat(metricRegistry.getGauges().get("resilience4j.retry.testName." + FAILED_CALLS_WITH_RETRY).getValue()).isEqualTo(1L);
  assertThat(metricRegistry.getGauges().get("resilience4j.retry.testName." + FAILED_CALLS_WITHOUT_RETRY).getValue()).isEqualTo(0L);
}

代码示例来源：origin: resilience4j/resilience4j

@Test
public void shouldConsumeOnRetryEvent() {
  given(helloWorldService.returnHelloWorld())
      .willThrow(new WebServiceException("BAM!"));
  retry.getEventPublisher()
    .onRetry(event ->
        logger.info(event.getEventType().toString()));
  Try.ofSupplier(Retry.decorateSupplier(retry, helloWorldService::returnHelloWorld));
  then(helloWorldService).should(times(3)).returnHelloWorld();
  then(logger).should(times(2)).info("RETRY");
}

代码示例来源：origin: resilience4j/resilience4j

@Test
public void shouldConsumeOnErrorEvent() {
  given(helloWorldService.returnHelloWorld())
      .willThrow(new WebServiceException("BAM!"));
  retry.getEventPublisher()
    .onError(event ->
        logger.info(event.getEventType().toString()));
  Try.ofSupplier(Retry.decorateSupplier(retry, helloWorldService::returnHelloWorld));
  then(logger).should(times(1)).info("ERROR");
  then(helloWorldService).should(times(3)).returnHelloWorld();
}

代码示例来源：origin: resilience4j/resilience4j

@Test
public void shouldConsumeIgnoredErrorEvent() {
  given(helloWorldService.returnHelloWorld())
      .willThrow(new WebServiceException("BAM!"));
  RetryConfig retryConfig = RetryConfig.custom()
      .retryOnException(throwable -> Match(throwable).of(
          Case($(instanceOf(WebServiceException.class)), false),
          Case($(), true)))
      .build();
  retry = Retry.of("testName", retryConfig);
  retry.getEventPublisher()
    .onIgnoredError(event ->
        logger.info(event.getEventType().toString()));
  Try.ofSupplier(Retry.decorateSupplier(retry, helloWorldService::returnHelloWorld));
  then(logger).should(times(1)).info("IGNORED_ERROR");
  then(helloWorldService).should(times(1)).returnHelloWorld();
}

代码示例来源：origin: com.github.robozonky/robozonky-common

private static <O> Either<Throwable, O> execute(final Supplier<O> operation) {
  LOGGER.trace("Will execute {}.", operation);
  return Try.ofSupplier(operation).map(Either::<Throwable, O>right)
      .recover(t -> {
        LOGGER.debug("Operation failed.", t);
        return Either.left(t);
      }).get();
}

代码示例来源：origin: RoboZonky/robozonky

private static <O> Either<Throwable, O> execute(final Supplier<O> operation) {
  LOGGER.trace("Will execute {}.", operation);
  return Try.ofSupplier(operation).map(Either::<Throwable, O>right)
      .recover(t -> {
        LOGGER.debug("Operation failed.", t);
        return Either.left(t);
      }).get();
}

代码示例来源：origin: RoboZonky/robozonky

CompletableFuture<Void> refreshIfNotAlreadyRefreshing(final CompletableFuture<Void> old) {
  if (old == null || old.isDone()) {
    logger.trace("Starting async reload.");
    final Runnable asyncOperation = () -> Try.ofSupplier(() -> getOperation().apply(value.get()))
        .peek(v -> processRetrievedValue(v, value::set)) // set the value on success
        .getOrElseGet(t -> {
          logger.warn("Async reload failed, operating with stale value.", t);
          return null;
        });
    return CompletableFuture.runAsync(asyncOperation, Scheduler.inBackground().getExecutor());
  } else {
    logger.trace("Reload already in progress on {} with {}.", this, old);
    return old;
  }
}

代码示例来源：origin: com.github.robozonky/robozonky-common

CompletableFuture<Void> refresh(final CompletableFuture<Void> old) {
  if (old == null || old.isDone()) {
    logger.trace("Starting async reload.");
    final Runnable asyncOperation = () -> Try.ofSupplier(getOperation())
        .peek(v -> processRetrievedValue(v, value::set)) // set the value on success
        .getOrElseGet(t -> {
          logger.warn("Async reload failed, operating with stale value.", t);
          return null;
        });
    return CompletableFuture.runAsync(asyncOperation, Scheduler.inBackground().getExecutor());
  } else {
    logger.trace("Reload already in progress on {} with {}.", this, old);
    return old;
  }
}

代码示例来源：origin: com.github.robozonky/robozonky-common

@Override
  public synchronized Either<Throwable, T> get() {
    if (!needsReload()) {
      logger.trace("Not reloading {}.", this);
      return Either.right(value.get());
    }
    logger.trace("Reloading {}.", this);
    return Try.ofSupplier(getOperation())
        .peek(v -> processRetrievedValue(v, value::set))
        .toEither();
  }
}

代码示例来源：origin: RoboZonky/robozonky

@Override
public Either<Throwable, T> get() {
  if (needsReload()) { // double-checked locking to make sure the reload only happens once
    synchronized (this) {
      if (needsReload()) {
        logger.trace("Reloading {}.", this);
        return Try.ofSupplier(() -> getOperation().apply(value.get()))
            .peek(v -> processRetrievedValue(v, value::set))
            .toEither();
      }
      // otherwise fall through to retrieve the value
    }
  }
  logger.trace("Not reloading {}.", this);
  return Either.right(value.get());
}

代码示例来源：origin: com.github.robozonky/robozonky-common

@Override
  public synchronized Either<Throwable, T> get() {
    if (value.get() == null) { // force value retrieval and wait for it
      logger.debug("Fetching initial value synchronously on {}.", this);
      return Try.ofSupplier(getOperation())
          .peek(v -> processRetrievedValue(v, value::set))
          .toEither();
    }
    if (!needsReload()) { // return old value
      logger.trace("Not reloading {}.", this);
      return Either.right(value.get());
    }
    // trigger retrieval but return existing value
    final CompletableFuture<Void> currentFuture = future.getAndUpdate(this::refresh);
    logger.debug("Retrieved potentially stale value on {}, while {}.", this, currentFuture);
    return Either.right(value.get());
  }
}

代码示例来源：origin: RoboZonky/robozonky

@Override
public Either<Throwable, T> get() {
  if (!hasValue()) { // force value retrieval and wait for it
    synchronized (this) {
      if (!hasValue()) { // double-checked locking to make sure the value is only ever loaded once
        logger.debug("Fetching initial value synchronously on {}.", this);
        return Try.ofSupplier(() -> getOperation().apply(null))
            .peek(v -> processRetrievedValue(v, value::set))
            .toEither();
      }
      // otherwise fall through to retrieve the current value
    }
  }
  if (needsReload()) { // trigger value retrieval on the background
    synchronized (this) {
      final CompletableFuture<Void> currentFuture = future.getAndUpdate(this::refreshIfNotAlreadyRefreshing);
      logger.debug("Retrieved potentially stale value on {}, while {}.", this, currentFuture);
    }
  }
  // return the current value
  return Either.right(value.get());
}

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