Add retry limiter support #6318
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * Copyright 2025 LY Corporation | ||
| * | ||
| * LY Corporation licenses this file to you 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: | ||
| * | ||
| * https://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. | ||
| */ | ||
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| package com.linecorp.armeria.client.retry; | ||
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| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| import com.linecorp.armeria.client.ClientRequestContext; | ||
| import com.linecorp.armeria.client.retry.limiter.RetryLimiter; | ||
| import com.linecorp.armeria.common.annotation.Nullable; | ||
| import com.linecorp.armeria.common.logging.RequestLog; | ||
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| /** | ||
| * Executes {@link RetryLimiter} operations with proper exception handling. | ||
| * <p> | ||
| * This class provides static utility methods to safely execute retry limiter operations. | ||
| * It handles null limiters gracefully and catches any exceptions thrown by the limiter | ||
| * to prevent them from affecting the retry logic. | ||
| * </p> | ||
| * <p> | ||
| * When a limiter throws an exception, it is logged as an error and the operation | ||
| * defaults to allowing the retry to proceed (returning {@code true} for {@link #shouldRetry} | ||
| * and doing nothing for {@link #onCompletedAttempt}). | ||
| * </p> | ||
| */ | ||
| final class RetryLimiterExecutor { | ||
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| private RetryLimiterExecutor() {} | ||
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| private static final Logger logger = LoggerFactory.getLogger(RetryLimiterExecutor.class); | ||
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| /** | ||
| * Determines whether a retry should be attempted based on the provided limiter. | ||
| * <p> | ||
| * This method safely executes the limiter's {@link RetryLimiter#shouldRetry} method. | ||
| * If the limiter is null, this method returns {@code true} to allow retries. | ||
| * If the limiter throws an exception, it is logged and {@code true} is returned | ||
| * to ensure retries can still proceed. | ||
| * </p> | ||
| * | ||
| * @param limiter the retry limiter to consult, or {@code null} if no limiter is configured | ||
| * @param ctx the client request context | ||
| * @param numAttemptsSoFar the number of attempts made so far (0-based) | ||
| * @return {@code true} if a retry should be attempted, {@code false} otherwise. | ||
| * Returns {@code true} if the limiter is null or throws an exception. | ||
| */ | ||
| public static boolean shouldRetry(@Nullable RetryLimiter limiter, ClientRequestContext ctx, | ||
| int numAttemptsSoFar) { | ||
| try { | ||
| if (limiter != null) { | ||
| return limiter.shouldRetry(ctx, numAttemptsSoFar); | ||
| } else { | ||
| return true; | ||
| } | ||
| } catch (Throwable t) { | ||
| logger.error("Failed to execute RetryLimiter.shouldRetry: limiter={}, attempts={}", limiter, | ||
| numAttemptsSoFar, t); | ||
| return true; | ||
| } | ||
| } | ||
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| /** | ||
| * Notifies the limiter that an attempt has been completed. | ||
| * <p> | ||
| * This method safely executes the limiter's {@link RetryLimiter#onCompletedAttempt} method. | ||
| * If the limiter is null, this method does nothing. | ||
| * If the limiter throws an exception, it is logged but does not affect the retry flow. | ||
| * </p> | ||
| * | ||
| * @param limiter the retry limiter to notify, or {@code null} if no limiter is configured | ||
| * @param ctx the client request context | ||
| * @param requestLog the request log containing details about the completed attempt | ||
| * @param numAttemptsSoFar the number of attempts made so far (0-based) | ||
| */ | ||
| public static void onCompletedAttempt(@Nullable RetryLimiter limiter, ClientRequestContext ctx, | ||
| RequestLog requestLog, int numAttemptsSoFar) { | ||
| try { | ||
| if (limiter != null) { | ||
| limiter.onCompletedAttempt(ctx, requestLog, numAttemptsSoFar); | ||
| } | ||
| } catch (Throwable t) { | ||
| logger.error("Failed to execute RetryLimiter.onCompletedAttempt: limiter={}, attempts={}", limiter, | ||
| numAttemptsSoFar, t); | ||
| } | ||
| } | ||
| } |
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Note:
AbstractRetryingClientis public so this and the change above are breaking changes. Let us note it in the PR description.There was a problem hiding this comment.
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But these are protected methods, do they also count as public api?
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As this class is also not final people could inherit from it and use those methods. I cannot think of a use-case for it but theoretically it is possible. In the doc comments we are also not advising against it 🤷