Java Code Examples for io.github.resilience4j.retry.Retry#decorateCallable()

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Example 1
Source File: ResilienceHandler.java    From cloud-espm-cloud-native with Apache License 2.0 7 votes vote down vote up 
/**
 * This method returns a desired Tax(taxAmount, taxPercentage) value when the TaxService is up. 
 * If the TaxService is down, it applies a combination of following fault tolerance patterns 
 * in a sequence: TimeLimiter, CircuitBreaker and Retry using a Callable. When all the attempts 
 * are exhausted it calls a fallback method to recover from failure and offers the default tax value.
 * 
 * @param amount
 * @return
 */
public Tax applyResiliencePatterns(BigDecimal amount) {

	CircuitBreaker circuitBreaker = configureCircuitBreaker();
	TimeLimiter timeLimiter = configureTimeLimiter();
	Retry retry = configureRetry();
	
	Supplier<CompletableFuture<Tax>> futureSupplier = () -> CompletableFuture.supplyAsync(() -> salesOrderService.supplyTax(amount));
	Callable<Tax> callable = TimeLimiter.decorateFutureSupplier(timeLimiter, futureSupplier);
	callable = CircuitBreaker.decorateCallable(circuitBreaker, callable);
	callable = Retry.decorateCallable(retry, callable);
	
	//Executing the decorated callable and recovering from any exception by calling the fallback method
	Try<Tax> result = Try.ofCallable(callable).recover(throwable -> taxServiceFallback(amount));
	return result.get();
}
Example 2
Source File: SupplierRetryTest.java    From resilience4j with Apache License 2.0 6 votes vote down vote up 
@Test
public void testDecorateCallableWithRetryResult() throws Exception {
    given(helloWorldService.returnHelloWorldWithException())
        .willThrow(new HelloWorldException())
        .willReturn("Hello world");
    final RetryConfig tryAgain = RetryConfig.<String>custom()
        .retryOnResult(s -> s.contains("Hello world"))
        .maxAttempts(2).build();
    Retry retry = Retry.of("id", tryAgain);
    Callable<String> callable = Retry
        .decorateCallable(retry, helloWorldService::returnHelloWorldWithException);

    String result = callable.call();

    then(helloWorldService).should(times(2)).returnHelloWorldWithException();
    assertThat(result).isEqualTo("Hello world");
    assertThat(sleptTime).isEqualTo(RetryConfig.DEFAULT_WAIT_DURATION);
}
Example 3
Source File: SupplierRetryTest.java    From resilience4j with Apache License 2.0 5 votes vote down vote up 
@Test
public void testDecorateCallable() throws Exception {
    given(helloWorldService.returnHelloWorldWithException())
        .willThrow(new HelloWorldException())
        .willReturn("Hello world");
    Retry retry = Retry.ofDefaults("id");
    Callable<String> callable = Retry
        .decorateCallable(retry, helloWorldService::returnHelloWorldWithException);

    String result = callable.call();

    then(helloWorldService).should(times(2)).returnHelloWorldWithException();
    assertThat(result).isEqualTo("Hello world");
    assertThat(sleptTime).isEqualTo(RetryConfig.DEFAULT_WAIT_DURATION);
}
Example 4
Source File: Decorators.java    From resilience4j with Apache License 2.0 4 votes vote down vote up 
public DecorateCallable<T> withRetry(Retry retryContext) {
    callable = Retry.decorateCallable(retryContext, callable);
    return this;
}