聊聊lettuce的shareNativeConnection参数

最新推荐文章于 2025-05-23 18:36:13 发布

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最新推荐文章于 2025-05-23 18:36:13 发布 · 3.8k 阅读

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原文链接：https://juejin.im/post/5b9e5f2fe51d450e6a2dfafb

文章标签：

#java #数据库 #netty

本文深入探讨了LettuceConnectionFactory的shareNativeConnection参数，解释了当该参数为true时，如何共享native connection，并分析了getReactiveConnection的行为。此外，还介绍了连接池的管理，包括ConnectionWatchdog的重连机制以及validateConnection参数的影响，当validateConnection为true时，可能出现的异常情况。

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序

本文主要研究一下lettuce的shareNativeConnection参数

LettuceConnectionFactory

spring-data-redis-2.0.10.RELEASE-sources.jar!/org/springframework/data/redis/connection/lettuce/LettuceConnectionFactory.java

public class LettuceConnectionFactory
		implements InitializingBean, DisposableBean, RedisConnectionFactory, ReactiveRedisConnectionFactory {

	private static final ExceptionTranslationStrategy EXCEPTION_TRANSLATION = new PassThroughExceptionTranslationStrategy(
			LettuceConverters.exceptionConverter());

	private final Log log = LogFactory.getLog(getClass());
	private final LettuceClientConfiguration clientConfiguration;

	private @Nullable AbstractRedisClient client;
	private @Nullable LettuceConnectionProvider connectionProvider;
	private @Nullable LettuceConnectionProvider reactiveConnectionProvider;
	private boolean validateConnection = false;
	private boolean shareNativeConnection = true;
	private @Nullable SharedConnection<byte[]> connection;
	private @Nullable SharedConnection<ByteBuffer> reactiveConnection;
	private @Nullable LettucePool pool;
	/** Synchronization monitor for the shared Connection */
	private final Object connectionMonitor = new Object();
	private boolean convertPipelineAndTxResults = true;
	private RedisStandaloneConfiguration standaloneConfig = new RedisStandaloneConfiguration("localhost", 6379);
	private @Nullable RedisSentinelConfiguration sentinelConfiguration;
	private @Nullable RedisClusterConfiguration clusterConfiguration;
	private @Nullable ClusterCommandExecutor clusterCommandExecutor;

	//......

	@Override
	public LettuceReactiveRedisConnection getReactiveConnection() {

		return getShareNativeConnection()
				? new LettuceReactiveRedisConnection(getSharedReactiveConnection(), reactiveConnectionProvider)
				: new LettuceReactiveRedisConnection(reactiveConnectionProvider);
	}

	@Override
	public LettuceReactiveRedisClusterConnection getReactiveClusterConnection() {

		if (!isClusterAware()) {
			throw new InvalidDataAccessApiUsageException("Cluster is not configured!");
		}

		RedisClusterClient client = (RedisClusterClient) this.client;

		return getShareNativeConnection()
				? new LettuceReactiveRedisClusterConnection(getSharedReactiveConnection(), reactiveConnectionProvider, client)
				: new LettuceReactiveRedisClusterConnection(reactiveConnectionProvider, client);
	}

	/**
	 * Indicates if multiple {@link LettuceConnection}s should share a single native connection.
	 *
	 * @return native connection shared.
	 */
	public boolean getShareNativeConnection() {
		return shareNativeConnection;
	}

	/**
	 * @return the shared connection using {@link ByteBuffer} encoding for reactive API use. {@literal null} if
	 *         {@link #getShareNativeConnection() connection sharing} is disabled.
	 * @since 2.0.1
	 */
	@Nullable
	protected StatefulConnection<ByteBuffer, ByteBuffer> getSharedReactiveConnection() {
		return shareNativeConnection ? getOrCreateSharedReactiveConnection().getConnection() : null;
	}

	private SharedConnection<ByteBuffer> getOrCreateSharedReactiveConnection() {

		synchronized (this.connectionMonitor) {

			if (this.reactiveConnection == null) {
				this.reactiveConnection = new SharedConnection<>(reactiveConnectionProvider, true);
			}

			return this.reactiveConnection;
		}
	}
}
复制代码

可以看到这里的shareNativeConnection默认为true，表示多个LettuceConnection将共享一个native connection
如果该值为true，则getReactiveConnection及getReactiveClusterConnection方法使用的是getSharedReactiveConnection<