singleton

简明释义

英[ˈsɪŋɡltən]美[ˈsɪŋɡltən]

n. 单独的人（或物体）；单生子女，单生幼畜；单身的人；（纸牌戏，尤指桥牌）单张；单元（素）集

n. （Singleton）（美）辛格尔顿（人名）

复 数 s i n g l e t o n s

英英释义

单词用法

同义词

反义词

例句

1.The Singleton pattern is shown in Figure 5.

Singleton模式如图5所示。

2.For example, take a look at the connection pool singleton in Listing 1.

例如，看一下清单1内所示的这个连接池单例。

3.I'll examine the idea of a singleton, memory pooling, and data streaming.

我将分析单元素、内存池和数据流的概念。

4.It is implemented as a singleton class.

它是一个单实例类。

5.Hence, SignalTranslator adopts a singleton design pattern.

因此，SignalTranslator采用了singleton设计模式。

6.A singleton bean is a singleton in the context of the owning container.

Singletonbean是一个在所属容器上下文中的单例对象。

7.In order to reduce memory usage, the resource bundle object is static and singleton.

为了减少内存使用，资源对象是静态和单一的。

8.The Singleton creation pattern is a common programming idiom.

单例创建模式是一个通用的编程习语。

9.The API is straightforward: You call a singleton method and get back a connection object.

API很直观：您调用单个方法，并返回一个连接对象。

10.In a multiplayer game, the game manager is often implemented as a singleton to manage game states.

在多人游戏中，游戏管理器通常作为 singleton 实现，以管理游戏状态。

11.In programming, a singleton is a design pattern that restricts a class to a single instance.

在编程中，singleton 是一种设计模式，它将类限制为单个实例。

12.The singleton instance of the database connection ensures that all parts of the application use the same connection.

数据库连接的 singleton 实例确保应用程序的所有部分使用相同的连接。

13.Using a singleton for logging can simplify access to the log file from different parts of an application.

使用 singleton 进行日志记录可以简化应用程序不同部分对日志文件的访问。

14.When creating a singleton, you often make the constructor private to prevent external instantiation.

创建 singleton 时，通常将构造函数设置为私有，以防止外部实例化。

作文

In the world of software development, the term singleton refers to a design pattern that restricts the instantiation of a class to one single instance. This means that no matter how many times you try to create an object of that class, you will always get the same instance back. The singleton pattern is particularly useful when exactly one object is needed to coordinate actions across the system. For example, if you have a logging class that records messages throughout your application, you would want to ensure that all parts of your application are writing to the same log file. By implementing a singleton, you can ensure that there is only one instance of the logger, which allows for consistent and centralized logging.The singleton pattern is not only limited to logging but can also be applied in various other scenarios. In a game development context, for instance, a game manager might be implemented as a singleton. This manager could handle the overall state of the game, track scores, and manage levels. By making the game manager a singleton, developers can ensure that there is only one point of control, which simplifies the management of game states and resources.However, while the singleton pattern has its advantages, it also comes with certain drawbacks. One of the main criticisms is that it can introduce global state into an application, which can make unit testing more difficult. Since a singleton provides a global access point, it can lead to tightly coupled code, where different parts of the application depend heavily on the singleton instance. This can hinder the flexibility and reusability of the code, making it harder to maintain in the long run.Moreover, in multi-threaded environments, implementing a singleton can pose challenges. If multiple threads attempt to access the singleton at the same time, it can lead to race conditions where two instances of the singleton are created. To prevent this, developers often use techniques such as lazy initialization or double-checked locking, but these methods can complicate the implementation.In conclusion, the singleton design pattern serves a specific purpose in software engineering by providing a way to limit class instantiation to a single instance. While it offers benefits such as controlled access to shared resources and simplified management of global states, it also presents challenges related to testing and thread safety. Developers must weigh these pros and cons carefully when deciding whether to implement a singleton in their applications. Understanding the implications of using a singleton can lead to better architectural decisions and ultimately result in more robust and maintainable software systems.

在软件开发的世界中，术语singleton指的是一种设计模式，该模式限制一个类的实例化为单一实例。这意味着无论你尝试多少次创建该类的对象，你总是会得到相同的实例。singleton模式在需要一个对象来协调系统各个部分的操作时尤其有用。例如，如果你有一个记录应用程序消息的日志类，你会希望确保应用程序的所有部分都写入同一个日志文件。通过实现一个singleton，你可以确保只有一个记录器实例，从而实现一致和集中化的日志记录。singleton模式不仅限于日志记录，还可以应用于各种其他场景。在游戏开发的背景下，例如，游戏管理器可能被实现为一个singleton。这个管理器可以处理游戏的整体状态、跟踪分数和管理关卡。通过将游戏管理器设为singleton，开发者可以确保只有一个控制点，这简化了游戏状态和资源的管理。然而，尽管singleton模式有其优点，但它也伴随着某些缺点。主要的批评之一是，它可能会在应用程序中引入全局状态，这可能使单元测试变得更加困难。由于singleton提供了一个全局访问点，这可能导致代码紧密耦合，应用程序的不同部分高度依赖于singleton实例。这可能会妨碍代码的灵活性和可重用性，长期来看使维护变得更加困难。此外，在多线程环境中，实现singleton可能会带来挑战。如果多个线程同时尝试访问singleton，可能会导致竞争条件，从而创建两个singleton实例。为了防止这种情况，开发者通常使用延迟初始化或双重检查锁定等技术，但这些方法可能会使实现变得复杂。总之，singleton设计模式在软件工程中具有特定的目的，通过提供一种将类实例化限制为单个实例的方法。虽然它提供了对共享资源的受控访问和全局状态的简化管理等好处，但也存在与测试和线程安全相关的挑战。开发者在决定是否在其应用程序中实现singleton时，必须仔细权衡这些利弊。理解使用singleton的影响可以导致更好的架构决策，并最终产生更健壮和可维护的软件系统。