spring-data-redis StaticMasterReplicaConnectionProvider 源码

spring-data-redis StaticMasterReplicaConnectionProvider 代码

文件路径：/src/main/java/org/springframework/data/redis/connection/lettuce/StaticMasterReplicaConnectionProvider.java

/*
 * Copyright 2018-2022 the original author or authors.
 *
 * 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
 *
 *      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.
 */
package org.springframework.data.redis.connection.lettuce;

import io.lettuce.core.ReadFrom;
import io.lettuce.core.RedisClient;
import io.lettuce.core.RedisURI;
import io.lettuce.core.api.StatefulConnection;
import io.lettuce.core.codec.RedisCodec;
import io.lettuce.core.masterreplica.MasterReplica;
import io.lettuce.core.masterreplica.StatefulRedisMasterReplicaConnection;
import io.lettuce.core.pubsub.StatefulRedisPubSubConnection;

import java.util.Collection;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;

import org.springframework.lang.Nullable;

/**
 * {@link LettuceConnectionProvider} implementation for a static Master/Replica connection suitable for eg. AWS
 * ElastiCache with replicas setup.<br/>
 * Lettuce auto-discovers node roles from the static {@link RedisURI} collection.
 *
 * @author Mark Paluch
 * @author Christoph Strobl
 * @since 2.1
 */
class StaticMasterReplicaConnectionProvider implements LettuceConnectionProvider {

	private final RedisClient client;
	private final RedisCodec<?, ?> codec;
	private final Optional<ReadFrom> readFrom;
	private final Collection<RedisURI> nodes;

	/**
	 * Create new {@link StaticMasterReplicaConnectionProvider}.
	 *
	 * @param client must not be {@literal null}.
	 * @param codec must not be {@literal null}.
	 * @param nodes must not be {@literal null}.
	 * @param readFrom can be {@literal null}.
	 */
	StaticMasterReplicaConnectionProvider(RedisClient client, RedisCodec<?, ?> codec, Collection<RedisURI> nodes,
			@Nullable ReadFrom readFrom) {

		this.client = client;
		this.codec = codec;
		this.readFrom = Optional.ofNullable(readFrom);
		this.nodes = nodes;
	}

	@Override
	public <T extends StatefulConnection<?, ?>> T getConnection(Class<T> connectionType) {

		if (connectionType.equals(StatefulRedisPubSubConnection.class)) {
			throw new UnsupportedOperationException("Pub/Sub connections not supported with Master/Replica configurations");
		}

		if (StatefulConnection.class.isAssignableFrom(connectionType)) {

			StatefulRedisMasterReplicaConnection<?, ?> connection = MasterReplica.connect(client, codec, nodes);
			readFrom.ifPresent(connection::setReadFrom);

			return connectionType.cast(connection);
		}

		throw new UnsupportedOperationException(String.format("Connection type %s not supported", connectionType));
	}

	@Override
	public <T extends StatefulConnection<?, ?>> CompletionStage<T> getConnectionAsync(Class<T> connectionType) {

		if (StatefulConnection.class.isAssignableFrom(connectionType)) {

			CompletableFuture<? extends StatefulRedisMasterReplicaConnection<?, ?>> connection = MasterReplica
					.connectAsync(client, codec, nodes);

			return connection.thenApply(it -> {

				readFrom.ifPresent(it::setReadFrom);
				return connectionType.cast(it);
			});
		}

		throw new UnsupportedOperationException(String.format("Connection type %s not supported", connectionType));
	}
}

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