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/*
* ============LICENSE_START====================================
* DCAEGEN2-SERVICES-SDK
* =========================================================
* Copyright (C) 2021 Nokia. All rights reserved.
* =========================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=====================================
*/
package org.onap.dcaegen2.services.sdk.rest.services.adapters.http.retry;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.config.RetryConfig;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.exceptions.RetryableException;
import org.onap.dcaegen2.services.sdk.rest.services.model.logging.RequestDiagnosticContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import reactor.core.publisher.Mono;
import reactor.util.retry.Retry;
import java.time.Duration;
import java.util.Objects;
public class RetryLogic {
private static final Logger LOGGER = LoggerFactory.getLogger(RetryLogic.class);
private final RetryConfig retryConfig;
private final RetryIntervalExtractor delayExtractor;
public RetryLogic(RetryConfig retryConfig, RetryIntervalExtractor delayExtractor) {
this.retryConfig = Objects.requireNonNull(retryConfig, "retryConfig must not be null");
this.delayExtractor = Objects.requireNonNull(delayExtractor, "delayExtractor must not be null");
}
public Retry retry(RequestDiagnosticContext requestDiagnosticContext) {
return Retry
.max(retryConfig.retryCount())
.doAfterRetryAsync(rc -> Mono.delay(calculateDelay(rc.failure())).then())
.doBeforeRetry(retrySignal -> requestDiagnosticContext.withSlf4jMdc(
LOGGER.isTraceEnabled(), () -> LOGGER.trace("Retry: {}", retrySignal)))
.filter(ex -> isRetryable(retryConfig, ex))
.onRetryExhaustedThrow((retryBackoffSpec, retrySignal) -> retrySignal.failure());
}
public boolean shouldRetry(int code) {
return retryConfig.retryableHttpResponseCodes().contains(code);
}
private Duration calculateDelay(Throwable tx) {
Duration retryInterval = retryConfig.retryInterval();
if (tx instanceof RetryableException) {
RetryableException ex = (RetryableException) tx;
retryInterval = delayExtractor.extractDelay(ex.getResponse())
.getOrElse(retryInterval);
}
return retryInterval;
}
private boolean isRetryable(RetryConfig retryConfig, Throwable ex) {
return retryConfig.retryableExceptions()
.toStream()
.exists(clazz -> clazz.isAssignableFrom(ex.getClass()));
}
}
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