[英]Resilience4j retry with CompletionStage
private CompletionStage<org.asynchttpclient.Response> executeWithRetries(Request request) {
RetryConfig retryConfig = RetryConfig.<org.asynchttpclient.Response>custom()
.maxAttempts(5)
.intervalFunction(IntervalFunction
.ofExponentialBackoff(TimeUnit.SECONDS.toMillis(2), 1.2))
.build();
Retry retry = Retry.of("proxy-retry" , retryConfig);
Supplier<CompletionStage<org.asynchttpclient.Response>> retryableSupplier = Retry.decorateCompletionStage(
retry , Executors.newScheduledThreadPool(10), () -> executeCall(request));
return retryableSupplier.get();
}
我正在使用這種方法,希望 executeCall 在拋出異常時至少重試 3 次。 executeCall(request) 方法返回一個 CompletionStage。
當我嘗試對這段代碼進行單元測試時,executeCall(request) 方法的調用次數僅為一次(我在此方法中拋出異常)。
我如何確保它至少重試 5 次(這是默認值)
可能您在供應商中拋出異常,而不是在供應商.get() 代碼返回的未來內。 我試過以下代碼:
import java.util.concurrent.*;
import java.util.function.*;
import io.github.resilience4j.retry.*;
public class Main {
private static final ScheduledExecutorService scheduledExecutorService =
Executors.newScheduledThreadPool(10);
public static void main(final String[] args) {
RetryConfig retryConfig = RetryConfig.custom()
.maxAttempts(5)
.intervalFunction(
IntervalFunction.ofExponentialBackoff(10, 1.2))
.build();
Retry retry = Retry.of("proxy-retry", retryConfig);
Supplier<CompletionStage<String>> supplier =
() -> CompletableFuture.supplyAsync(() -> {
System.out.println("failing code");
throw new RuntimeException();
});
retry.executeCompletionStage(scheduledExecutorService, supplier);
}
}
輸出是:
failing code
failing code
failing code
failing code
failing code
正如預期的那樣!
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