通道长连接分配问题

netty服务端给了N个连接，我是客户端，有M个服务器，想要让N个连接平均分配在M个服务器上。例如，如果N为5，M为3，则最好是两台台服务器2个连接、一台服务器1个连接。N为1，M为3的话，1台服务器1个连接，其他服务器0个连接。算法要稳定，即如果N和M固定的话每次计算的结果要是一样的。可以借助服务器内网ip作为服务器标识。

请给出java算法，和不同的N和M值，对应的不同的结果。

java 复制代码

import java.util.*;

public class ConnectionDistributor {

    public static Map<String, List<Integer>> distributeConnections(List<String> serverIps, int connectionCount) {
        Map<String, List<Integer>> distribution = new HashMap<>();
        int serverCount = serverIps.size();
        
        // Initialize the map with empty lists for each server IP
        for (String ip : serverIps) {
            distribution.put(ip, new ArrayList<>());
        }

        for (int i = 0; i < connectionCount; i++) {
            // Use the modulo operation to ensure even distribution
            String server = serverIps.get(i % serverCount);
            distribution.get(server).add(i + 1); // Connection IDs are 1-based
        }

        return distribution;
    }

    public static void main(String[] args) {
        List<String> serverIps = Arrays.asList("192.168.0.1", "192.168.0.2", "192.168.0.3");

        int[] connectionCounts = {1, 5, 10, 15, 20};
        for (int connectionCount : connectionCounts) {
            Map<String, List<Integer>> result = distributeConnections(serverIps, connectionCount);
            System.out.println("For " + connectionCount + " connections:");
            for (Map.Entry<String, List<Integer>> entry : result.entrySet()) {
                System.out.println("Server " + entry.getKey() + " has connections: " + entry.getValue());
            }
            System.out.println();
        }
    }
}

执行结果

java 复制代码

For 1 connections:
Server 192.168.0.2 has connections: []
Server 192.168.0.1 has connections: [1]
Server 192.168.0.3 has connections: []

For 5 connections:
Server 192.168.0.2 has connections: [2, 5]
Server 192.168.0.1 has connections: [1, 4]
Server 192.168.0.3 has connections: [3]

For 10 connections:
Server 192.168.0.2 has connections: [2, 5, 8]
Server 192.168.0.1 has connections: [1, 4, 7, 10]
Server 192.168.0.3 has connections: [3, 6, 9]

For 15 connections:
Server 192.168.0.2 has connections: [2, 5, 8, 11, 14]
Server 192.168.0.1 has connections: [1, 4, 7, 10, 13]
Server 192.168.0.3 has connections: [3, 6, 9, 12, 15]

For 20 connections:
Server 192.168.0.2 has connections: [2, 5, 8, 11, 14, 17, 20]
Server 192.168.0.1 has connections: [1, 4, 7, 10, 13, 16, 19]
Server 192.168.0.3 has connections: [3, 6, 9, 12, 15, 18]