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Questions and Answers
What is the primary reason for using a proxy to control access to an object?
What is a potential drawback of directly implementing deferred initialization code in an object's class?
What is the benefit of using a proxy to control access to an object, in terms of code maintenance?
What type of object is a prime candidate for using a proxy to control access?
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What is a scenario where you might not be able to implement deferred initialization code directly in an object's class?
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Study Notes
Proxy Design Pattern
- Proxy is a structural design pattern that provides a substitute or placeholder for another object.
- A proxy controls access to the original object, allowing you to perform actions before or after the request reaches the original object.
Problem and Motivation
- The need to control access to an object arises when it consumes a vast amount of system resources.
- Example: a massive object that is needed only occasionally.
- Lazy initialization can be implemented to create the object only when it's needed.
- However, this approach can lead to code duplication, as all clients would need to execute deferred initialization code.
Limitations
- In some cases, it's not possible to put the deferred initialization code directly into the object's class, such as when the class is part of a closed 3rd-party library.
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Description
Learn about the proxy design pattern, which allows you to control access to an object and perform actions before or after the request reaches the original object. Understand the benefits of lazy initialization.
