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Advanced and thread-safe Java Redis client for synchronous, asynchronous, and reactive usage. Supports Cluster, Sentinel, Pipelining, Auto-Reconnect, Codecs and much more.

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/*
 * Copyright 2011-Present, Redis Ltd. and Contributors
 * All rights reserved.
 *
 * Licensed under the MIT License.
 *
 * This file contains contributions from third-party contributors
 * 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 io.lettuce.core.cluster;

import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Collectors;

import io.lettuce.core.RedisURI;
import io.lettuce.core.api.StatefulRedisConnection;
import io.lettuce.core.cluster.models.partitions.RedisClusterNode;
import io.lettuce.core.protocol.ConnectionIntent;

/**
 * Static selection of nodes.
 *
 * @param  API type.
 * @param  Command command interface type to invoke multi-node operations.
 * @param  Key type.
 * @param  Value type.
 * @author Mark Paluch
 */
class StaticNodeSelection extends AbstractNodeSelection {

    private final ClusterDistributionChannelWriter writer;

    private final ConnectionIntent connectionIntent;

    private final List redisClusterNodes;

    private final Function, API> apiExtractor;

    public StaticNodeSelection(ClusterDistributionChannelWriter writer, Predicate selector,
            ConnectionIntent connectionIntent, Function, API> apiExtractor) {

        this.writer = writer;
        this.connectionIntent = connectionIntent;
        this.apiExtractor = apiExtractor;

        this.redisClusterNodes = writer.getPartitions().stream().filter(selector).collect(Collectors.toList());
    }

    @Override
    protected CompletableFuture> getConnection(RedisClusterNode redisClusterNode) {

        RedisURI uri = redisClusterNode.getUri();

        AsyncClusterConnectionProvider async = (AsyncClusterConnectionProvider) writer.getClusterConnectionProvider();
        return async.getConnectionAsync(connectionIntent, uri.getHost(), uri.getPort());
    }

    @Override
    protected CompletableFuture getApi(RedisClusterNode redisClusterNode) {
        return getConnection(redisClusterNode).thenApply(apiExtractor);
    }

    @Override
    protected List nodes() {
        return redisClusterNodes;
    }

}