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异步与多线程-王瀚森-笃实43 #26

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29 changes: 26 additions & 3 deletions homework.cs
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Expand Up @@ -29,7 +29,25 @@ public Task<List<Book>> GetBooksAsync()
public async Task UpdateInventoryAsync(string title, int quantity)
{
await Task.Delay(100); // 模拟网络延迟

lock (_lock) {
var book = _books.Find(b => b.Title == title);
if (book != null)
{
if (book.Inventory >= quantity)
{
book.Inventory -= quantity;
Console.WriteLine($"成功购买 {quantity} 本《{title}》，剩余库存：{book.Inventory} 本");
}
else
{
Console.WriteLine($"库存不足，无法购买 {quantity} 本《{title}》，当前库存：{book.Inventory} 本");
}
}
else
{
Console.WriteLine($"书籍《{title}》不存在");
}
}
// TODO: 使用 lock 语句保证线程安全
// 提示：在 lock 块中查找书籍并更新库存，若库存不足则输出提示
}
Expand All @@ -42,6 +60,7 @@ public class BookStore
// TODO: 实现异步购书方法CheckoutAsync，调用 UpdateInventoryAsync
public async Task CheckoutAsync(string bookTitle, int quantity)
{
await _db.UpdateInventoryAsync(bookTitle, quantity);
}

public async Task SimulateMultipleUsers()
Expand All @@ -59,10 +78,14 @@ public async Task SimulateMultipleUsers()
// 提示：创建多个 Task 调用 CheckoutAsync，并传入不同书名和数量
var tasks = new List<Task>
{

CheckoutAsync("C#入门", 2),
CheckoutAsync("C#入门", 3),
CheckoutAsync("异步编程", 1),
CheckoutAsync("异步编程", 2),
CheckoutAsync("异步编程", 3)
};


await Task.WhenAll(tasks);
Console.WriteLine("\n购买后库存：");
books = await _db.GetBooksAsync();
foreach (var book in books)
Expand Down