13 Questions
What is the primary goal of using an adapter in the context of the stock market app?
To convert the interface of the analytics library to work with XML data
What is the main reason why the analytics library cannot be used 'as is' in the stock market app?
The library expects data in a format that's incompatible with the app
What is the term for the object that an adapter wraps to hide the complexity of conversion?
Wrapped object
What is the benefit of using a two-way adapter in the stock market app?
It can convert the calls in both directions
What is the purpose of creating XML-to-JSON adapters for every class of the analytics library?
To make the analytics library compatible with the app's code
What pattern is the adapter an example of in the context of the stock market app?
Structural Pattern
What happens when an adapter receives a call in the context of the stock market app?
It translates the incoming XML data into a JSON structure and passes the call to the appropriate methods of a wrapped analytics object
What is the advantage of using adapters in the context of the stock market app?
It allows objects with incompatible interfaces to collaborate
Which creational pattern is most related to the concept of adapters?
Abstract Factory
What is the main advantage of using adapters in the context of the stock market app?
It enables the app to communicate with the analytics library without changing its source code.
How do adapters facilitate collaboration between objects with different interfaces?
By converting the data format of one object to match the other
What is the primary benefit of using a two-way adapter?
It enables bidirectional data conversion.
What is the relationship between the adapter and the wrapped object?
The adapter has a reference to the wrapped object.
Study Notes
Integrating a 3rd-Party Analytics Library
- A 3rd-party analytics library may not be compatible with an app due to differences in data format (e.g., JSON vs. XML).
- Modifying the library's source code may not be possible or desirable, especially if it breaks existing code.
Problem Scenario: Stock Market Monitoring App
- An app downloads stock data from multiple sources in XML format and displays charts and diagrams for the user.
- Integrating a 3rd-party analytics library that only works with JSON data is problematic.
Solution: Adapter Pattern
- An adapter is a special object that converts the interface of one object to make it compatible with another object.
- Adapters can convert data formats (e.g., meters to imperial units) and facilitate collaboration between objects with different interfaces.
- Adapters work by wrapping one object to hide the complexity of conversion, without the wrapped object being aware of the adapter.
Two-Way Adapters
- Two-way adapters can convert calls in both directions, enabling bi-directional communication between objects.
XML-to-JSON Adapter for the Analytics Library
- Create an adapter for each class of the analytics library that the app works with directly.
- The adapter translates incoming XML data into a JSON structure and passes the call to the appropriate methods of the wrapped analytics object.
- The app communicates with the library only via these adapters, enabling seamless integration despite incompatible data formats.
Integrating a 3rd-Party Analytics Library
- A 3rd-party analytics library may not be compatible with an app due to differences in data format (e.g., JSON vs. XML).
- Modifying the library's source code may not be possible or desirable, especially if it breaks existing code.
Problem Scenario: Stock Market Monitoring App
- An app downloads stock data from multiple sources in XML format and displays charts and diagrams for the user.
- Integrating a 3rd-party analytics library that only works with JSON data is problematic.
Solution: Adapter Pattern
- An adapter is a special object that converts the interface of one object to make it compatible with another object.
- Adapters can convert data formats (e.g., meters to imperial units) and facilitate collaboration between objects with different interfaces.
- Adapters work by wrapping one object to hide the complexity of conversion, without the wrapped object being aware of the adapter.
Two-Way Adapters
- Two-way adapters can convert calls in both directions, enabling bi-directional communication between objects.
XML-to-JSON Adapter for the Analytics Library
- Create an adapter for each class of the analytics library that the app works with directly.
- The adapter translates incoming XML data into a JSON structure and passes the call to the appropriate methods of the wrapped analytics object.
- The app communicates with the library only via these adapters, enabling seamless integration despite incompatible data formats.
Learn how to adapt and integrate third-party libraries into your app, overcoming compatibility issues and source code limitations.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
