如何通过实现对象池模式在Java函数中优化内存分配？

// Pool 类
public class Pool<T extends PooledObject> {
    private LinkedList<T> availableObjects;
    private PooledObjectFactory<T> factory;

    public Pool(PooledObjectFactory<T> factory) {
        this.availableObjects = new LinkedList<>();
        this.factory = factory;
    }

    public synchronized T acquireObject() {
        if (availableObjects.isEmpty()) {
            return factory.createObject();
        }
        return availableObjects.removeFirst();
    }

    public synchronized void releaseObject(T object) {
        availableObjects.add(object);
    }
}

// PooledObject 接口
public interface PooledObject {
    void use();
    void release();
}

// PooledObjectFactory 接口
public interface PooledObjectFactory<T extends PooledObject> {
    T createObject();
    void releaseObject(T object);
}

import com.google.cloud.functions.HttpFunction;
import com.google.cloud.functions.HttpRequest;
import com.google.cloud.functions.HttpResponse;
import java.io.BufferedWriter;
import java.io.IOException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

// 创建对象池
Pool<ExecutorService> executorPool = new Pool<>(new ExecutorServiceFactory());

public class WordCount implements HttpFunction {
    @Override
    public void service(HttpRequest request, HttpResponse response)
            throws IOException {
        // 获取单词
        String word = request.getFirstQueryParameter("word").orElse("");

        // 从对象池中获取线程池
        ExecutorService executor = executorPool.acquireObject();

        // 创建并执行计数任务
        executor.submit(() -> {
            long count = countWords(word);
            try (BufferedWriter writer = response.getWriter()) {
                writer.write(String.format("Count of words: %d", count));
            } catch (IOException e) {
                e.printStackTrace();
            }
            // 将线程池释放回对象池
            executorPool.releaseObject(executor);
        });
    }

    // 线程池工厂
    private static class ExecutorServiceFactory
            implements PooledObjectFactory<ExecutorService> {
        @Override
        public ExecutorService createObject() {
            return Executors.newFixedThreadPool(1);
        }

        @Override
        public void releaseObject(ExecutorService object) {
            object.shutdown();
            try {
                object.awaitTermination(1, TimeUnit.SECONDS);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}