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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 2011-2016 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
 *
 *      http://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 com.lambdaworks.redis.cluster;

import java.net.SocketAddress;
import java.util.ArrayList;
import java.util.Collection;
import java.util.function.Function;
import java.util.function.Supplier;

import com.lambdaworks.redis.cluster.models.partitions.RedisClusterNode;
import com.lambdaworks.redis.internal.LettuceAssert;
import com.lambdaworks.redis.resource.ClientResources;
import com.lambdaworks.redis.resource.SocketAddressResolver;

import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;

/**
 * Round-Robin socket address supplier. Cluster nodes are iterated circular/infinitely.
 *
 * @author Mark Paluch
 */
class RoundRobinSocketAddressSupplier implements Supplier {

    private static final InternalLogger logger = InternalLoggerFactory.getInstance(RoundRobinSocketAddressSupplier.class);

    private final Collection partitions;
    private final Collection clusterNodes = new ArrayList<>();
    private final Function, Collection> sortFunction;
    private final ClientResources clientResources;

    private RoundRobin roundRobin;

    public RoundRobinSocketAddressSupplier(Collection partitions,
            Function, Collection> sortFunction,
            ClientResources clientResources) {

        LettuceAssert.notNull(partitions, "Partitions must not be null");
        LettuceAssert.notNull(sortFunction, "Sort-Function must not be null");

        this.partitions = partitions;
        this.clusterNodes.addAll(partitions);
        this.roundRobin = new RoundRobin<>(clusterNodes);
        this.sortFunction = (Function) sortFunction;
        this.clientResources = clientResources;
        resetRoundRobin();
    }

    @Override
    public SocketAddress get() {
        if (!clusterNodes.containsAll(partitions)) {
            resetRoundRobin();
        }

        RedisClusterNode redisClusterNode = roundRobin.next();
        return getSocketAddress(redisClusterNode);
    }

    protected void resetRoundRobin() {
        clusterNodes.clear();
        clusterNodes.addAll(sortFunction.apply(partitions));
        roundRobin.offset = null;
    }

    protected SocketAddress getSocketAddress(RedisClusterNode redisClusterNode) {
        SocketAddress resolvedAddress = SocketAddressResolver.resolve(redisClusterNode.getUri(), clientResources.dnsResolver());
        logger.debug("Resolved SocketAddress {} using for Cluster node {}", resolvedAddress, redisClusterNode.getNodeId());
        return resolvedAddress;
    }
}