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Merge pull request #252 from ydb-platform/develop
Release v2.2.0
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| Original file line number | Diff line number | Diff line change |
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| Copyright 2019 YANDEX LLC | ||
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| 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 | ||
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| http://www.apache.org/licenses/LICENSE-2.0 | ||
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| 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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| Original file line number | Diff line number | Diff line change |
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| <project | ||
| xmlns="http://maven.apache.org/POM/4.0.0" | ||
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | ||
| xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> | ||
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| <modelVersion>4.0.0</modelVersion> | ||
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| <parent> | ||
| <groupId>tech.ydb</groupId> | ||
| <artifactId>ydb-sdk-parent</artifactId> | ||
| <version>2.2.0</version> | ||
| </parent> | ||
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| <artifactId>ydb-sdk-common</artifactId> | ||
| <name>Common module of Java SDK for YDB</name> | ||
| <description>Common module of Java SDK for YDB</description> | ||
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| <properties> | ||
| <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> | ||
| </properties> | ||
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| <dependencies> | ||
| <dependency> | ||
| <groupId>tech.ydb</groupId> | ||
| <artifactId>ydb-sdk-core</artifactId> | ||
| </dependency> | ||
| <dependency> | ||
| <groupId>org.slf4j</groupId> | ||
| <artifactId>slf4j-api</artifactId> | ||
| </dependency> | ||
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| <dependency> | ||
| <groupId>junit</groupId> | ||
| <artifactId>junit</artifactId> | ||
| <scope>test</scope> | ||
| </dependency> | ||
| <dependency> | ||
| <groupId>org.apache.logging.log4j</groupId> | ||
| <artifactId>log4j-slf4j-impl</artifactId> | ||
| <scope>test</scope> | ||
| </dependency> | ||
| </dependencies> | ||
| </project> |
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30
common/src/main/java/tech/ydb/common/retry/ErrorPolicy.java
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| package tech.ydb.common.retry; | ||
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| /** | ||
| * Recipes should use the configured error policy to decide how to retry | ||
| * errors like unsuccessful {@link tech.ydb.core.StatusCode}. | ||
| * | ||
| * @author Aleksandr Gorshenin | ||
| * @param <T> Type of errors to check | ||
| */ | ||
| public interface ErrorPolicy<T> { | ||
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| /** | ||
| * Returns true if the given value should be retried | ||
| * | ||
| * @param value value to check | ||
| * @return true if value is retryable | ||
| */ | ||
| boolean isRetryable(T value); | ||
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| /** | ||
| * Returns true if the given exception should be retried | ||
| * Usually exceptions are never retried, but some policies can implement more difficult logic | ||
| * | ||
| * @param ex exception to check | ||
| * @return true if exception is retryable | ||
| */ | ||
| default boolean isRetryable(Exception ex) { | ||
| return false; | ||
| } | ||
| } |
40 changes: 40 additions & 0 deletions
40
common/src/main/java/tech/ydb/common/retry/ExponentialBackoffRetry.java
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| package tech.ydb.common.retry; | ||
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| import java.util.concurrent.ThreadLocalRandom; | ||
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| /** | ||
| * | ||
| * @author Aleksandr Gorshenin | ||
| */ | ||
| public abstract class ExponentialBackoffRetry implements RetryPolicy { | ||
| private final long backoffMs; | ||
| private final int backoffCeiling; | ||
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| protected ExponentialBackoffRetry(long backoffMs, int backoffCeiling) { | ||
| this.backoffMs = backoffMs; | ||
| this.backoffCeiling = backoffCeiling; | ||
| } | ||
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| protected long backoffTimeMillis(int retryNumber) { | ||
| int slots = 1 << Math.min(retryNumber, backoffCeiling); | ||
| long delay = backoffMs * slots; | ||
| return delay + ThreadLocalRandom.current().nextLong(delay); | ||
| } | ||
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| /** | ||
| * Return current base of backoff delays | ||
| * @return backoff base duration in milliseconds | ||
| */ | ||
| public long getBackoffMillis() { | ||
| return backoffMs; | ||
| } | ||
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| /** | ||
| * Return current maximal level of backoff exponent | ||
| * @return maximal level of backoff exponent | ||
| */ | ||
| public int getBackoffCeiling() { | ||
| return backoffCeiling; | ||
| } | ||
| } |
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