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This Package contains Microsoft Azure Cosmos SDK (with Reactive Extension Reactor support) for Azure Cosmos DB SQL API
There is a newer version: 4.63.3
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
package com.azure.cosmos.implementation;

import com.azure.cosmos.CosmosException;
import com.azure.cosmos.implementation.apachecommons.lang.time.StopWatch;
import com.azure.cosmos.implementation.directconnectivity.AddressSelector;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import reactor.core.scheduler.Schedulers;

import java.time.Duration;
import java.util.function.Function;

/**
 * While this class is public, but it is not part of our published public APIs.
 * This is meant to be internally used only by our sdk.
 */
public class RetryUtils {
    private final static Logger logger = LoggerFactory.getLogger(BackoffRetryUtility.class);

    static Function, Flux> toRetryWhenFunc(IRetryPolicy policy) {
        return throwableFlux -> throwableFlux.flatMap(t -> {
            Exception e = Utils.as(t, Exception.class);
            if (e == null) {
                return Flux.error(t);
            }
            policy.captureStartTimeIfNotSet();
            Flux shouldRetryResultFlux = policy.shouldRetry(e).flux();
            return shouldRetryResultFlux.flatMap(s -> {
                CosmosException clientException = Utils.as(e, CosmosException.class);
                if(clientException != null) {
                    policy.addStatusAndSubStatusCode(null, clientException.getStatusCode(), clientException.getSubStatusCode());
                }

                if (s.backOffTime != null) {
                    policy.incrementRetry();
                    return Mono.delay(Duration.ofMillis(s.backOffTime.toMillis()), CosmosSchedulers.COSMOS_PARALLEL).flux();
                } else if (s.exception != null) {
                    return Flux.error(s.exception);
                } else {
                    // NoRetry return original failure
                    return Flux.error(t);
                }
            });
        });
    }

    /**
     * This method will be called after getting error on callbackMethod , and then keep trying between
     * callbackMethod and inBackoffAlternateCallbackMethod until success or as stated in
     * retry policy.
     * @param callbackMethod The callbackMethod
     * @param retryPolicy Retry policy
     * @param inBackoffAlternateCallbackMethod The inBackoffAlternateCallbackMethod
     * @param minBackoffForInBackoffCallback Minimum backoff for InBackoffCallbackMethod
     * @return
     */

    public static  Function> toRetryWithAlternateFunc(Function, Mono> callbackMethod,
                                                                            IRetryPolicy retryPolicy,
                                                                            Function,
                                                                            Mono> inBackoffAlternateCallbackMethod, Duration minBackoffForInBackoffCallback,
                                                                            RxDocumentServiceRequest rxDocumentServiceRequest,
                                                                            AddressSelector addressSelector) {
        return throwable -> {
            if(rxDocumentServiceRequest.requestContext != null && retryPolicy.getRetryCount() > 0) {
                retryPolicy.updateEndTime();
                rxDocumentServiceRequest.requestContext.updateRetryContext(retryPolicy, false);
            }

            Exception e = Utils.as(throwable, Exception.class);
            if (e == null) {
                return Mono.error(throwable);
            }
            retryPolicy.captureStartTimeIfNotSet();
            Mono shouldRetryResultFlux = retryPolicy.shouldRetry(e);
            return shouldRetryResultFlux.flatMap(shouldRetryResult -> {
                CosmosException clientException = Utils.as(e, CosmosException.class);
                if(clientException != null) {
                    retryPolicy.addStatusAndSubStatusCode(null, clientException.getStatusCode(), clientException.getSubStatusCode());
                }

                if (!shouldRetryResult.shouldRetry) {
                    retryPolicy.updateEndTime();

                    final Throwable errorToReturn = shouldRetryResult.exception != null ? shouldRetryResult.exception : e;
                    final Mono failure = Mono.error(errorToReturn);

                    if (shouldRetryResult.policyArg != null) {
                        Boolean forceAddressRefresh = shouldRetryResult.policyArg.getValue0();

                        if (forceAddressRefresh != null && forceAddressRefresh) {
                            startBackgroundAddressRefresh(rxDocumentServiceRequest, addressSelector);
                        }
                    }

                    return failure;
                }
                retryPolicy.incrementRetry();
                if(rxDocumentServiceRequest.requestContext != null && retryPolicy.getRetryCount() > 0) {
                    retryPolicy.updateEndTime();
                    rxDocumentServiceRequest.requestContext.updateRetryContext(retryPolicy, false);
                }

                if (inBackoffAlternateCallbackMethod != null
                        && shouldRetryResult.backOffTime.compareTo(minBackoffForInBackoffCallback) > 0) {
                    StopWatch stopwatch = new StopWatch();
                    startStopWatch(stopwatch);
                    return inBackoffAlternateCallbackMethod.apply(shouldRetryResult.policyArg)
                            .onErrorResume(recursiveWithAlternateFunc(callbackMethod, retryPolicy,
                                    inBackoffAlternateCallbackMethod, shouldRetryResult, stopwatch,
                                    minBackoffForInBackoffCallback, rxDocumentServiceRequest, addressSelector));
                } else if (shouldRetryResult.backOffTime == Duration.ZERO) {
                    return recursiveFunc(callbackMethod, retryPolicy, inBackoffAlternateCallbackMethod,
                            shouldRetryResult, minBackoffForInBackoffCallback, rxDocumentServiceRequest, addressSelector);
                } else {
                    return recursiveFunc(callbackMethod, retryPolicy, inBackoffAlternateCallbackMethod,
                        shouldRetryResult, minBackoffForInBackoffCallback, rxDocumentServiceRequest, addressSelector)
                        .delaySubscription(
                            Duration.ofMillis(shouldRetryResult.backOffTime.toMillis()),
                            CosmosSchedulers.COSMOS_PARALLEL);
                }
            });
        };
    }

    private static void startBackgroundAddressRefresh(
        RxDocumentServiceRequest request,
        AddressSelector addressSelector) {

        addressSelector.resolveAddressesAsync(request, true)
                       .publishOn(Schedulers.boundedElastic())
                       .subscribe(
                           r -> {
                           },
                           e -> logger.warn(
                               "Background refresh of addresses failed with {}", e.getMessage(), e)
                       );
    }

    private static  Mono recursiveFunc(
        Function, Mono> callbackMethod,
        IRetryPolicy retryPolicy,
        Function, Mono> inBackoffAlternateCallbackMethod,
        ShouldRetryResult shouldRetryResult,
        Duration minBackoffForInBackoffCallback,
        RxDocumentServiceRequest rxDocumentServiceRequest,
        AddressSelector addressSelector) {

        return callbackMethod.apply(shouldRetryResult.policyArg).onErrorResume(toRetryWithAlternateFunc(
                callbackMethod, retryPolicy, inBackoffAlternateCallbackMethod, minBackoffForInBackoffCallback, rxDocumentServiceRequest, addressSelector));
    }

    private static  Function> recursiveWithAlternateFunc(
        Function, Mono> callbackMethod,
        IRetryPolicy retryPolicy,
        Function, Mono> inBackoffAlternateCallbackMethod,
        ShouldRetryResult shouldRetryResult,
        StopWatch stopwatch,
        Duration minBackoffForInBackoffCallback,
        RxDocumentServiceRequest rxDocumentServiceRequest,
        AddressSelector addressSelector) {

        return throwable -> {
            Exception e = Utils.as(throwable, Exception.class);
            if (e == null) {
                return Mono.error(throwable);
            }

            stopStopWatch(stopwatch);
            logger.info("Failed inBackoffAlternateCallback with {}, proceeding with retry. Time taken: {}ms",
                    e.toString(), stopwatch.getTime());
            Duration backoffTime = shouldRetryResult.backOffTime.toMillis() > stopwatch.getTime()
                    ? Duration.ofMillis(shouldRetryResult.backOffTime.toMillis() - stopwatch.getTime())
                    : Duration.ZERO;
            return recursiveFunc(callbackMethod, retryPolicy, inBackoffAlternateCallbackMethod, shouldRetryResult,
                    minBackoffForInBackoffCallback, rxDocumentServiceRequest, addressSelector)
                    .delaySubscription(
                        Duration.ofMillis(backoffTime.toMillis()),
                        CosmosSchedulers.COSMOS_PARALLEL);
        };
    }

    private static void stopStopWatch(StopWatch stopwatch) {
        synchronized (stopwatch) {
            stopwatch.stop();
        }
    }

    private static void startStopWatch(StopWatch stopwatch) {
        synchronized (stopwatch) {
            stopwatch.start();
        }
    }
}