在处理大量并发连接时，如何有效地管理和调度连接，以避免资源耗尽或性能下降？

import java.nio.*;
import java.nio.channels.*;
import java.net.*;
import java.io.*;
import java.util.*;

public class ReactorServer {
    public static void main(String[] args) throws IOException {
        ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
        serverSocketChannel.bind(new InetSocketAddress(8080));
        serverSocketChannel.configureBlocking(false);

        Selector selector = Selector.open();
        serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);

        while (true) {
            if (selector.select() > 0) {
                Set<SelectionKey> selectedKeys = selector.selectedKeys();
                Iterator<SelectionKey> keyIterator = selectedKeys.iterator();
                while (keyIterator.hasNext()) {
                    SelectionKey key = keyIterator.next();
                    keyIterator.remove();

                    if (key.isAcceptable()) {
                        // 处理连接
                        SocketChannel client = ((ServerSocketChannel) key.channel()).accept();
                        client.configureBlocking(false);
                        client.register(selector, SelectionKey.OP_READ);
                    } else if (key.isReadable()) {
                        // 处理数据
                        SocketChannel client = (SocketChannel) key.channel();
                        ByteBuffer buffer = ByteBuffer.allocate(1024);
                        int bytesRead = client.read(buffer);
                        if (bytesRead == -1) {
                            client.close();
                        } else {
                            buffer.flip();
                            // 处理数据
                        }
                    }
                }
            }
        }
    }
}

import java.util.concurrent.*;

public class ThreadPoolExample {
    private static final ExecutorService threadPool = Executors.newFixedThreadPool(10); // 线程池大小

    public static void main(String[] args) {
        for (int i = 0; i < 100; i++) {
            threadPool.submit(() -> {
                // 模拟处理请求的任务
                try {
                    Thread.sleep(1000); // 模拟处理任务的延时
                    System.out.println("Task completed by " + Thread.currentThread().getName());
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            });
        }
    }
}