Abstract
The next stop on your voyage through the Design Patterns galaxy takes you to the Observer design pattern, another of the design patterns found in the GoF catalog. You will find this design pattern useful in situations where one class needs to be kept aware of changes occurring in another class.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Notes
- 1.
At that time, Interstate Commerce Commission (ICC) regulations allowed for a driver to drive continuously for up to 10 hours, after which the driver must take an 8-hour break.
- 2.
In those days, the nationwide maximum speed limit on U.S. interstate highways was 55 miles per hour.
- 3.
This was a career change for me. Three days after returning from my final run I attended my first class of the summer semester at my local community college, where I began to study computer programming.
- 4.
These days, GPS tracking technology makes this estimation technique unnecessary, and companies such as Qualcomm specialize in providing up-to-the-moment commercial fleet tracking systems.
- 5.
GoF, p. 293.
- 6.
GoF, p. 295.
- 7.
Somewhere before arriving in Los Angeles Ed and I would have changed drivers, but we would not have made our usual 2-hour stop to do this.
Author information
Authors and Affiliations
Rights and permissions
Copyright information
© 2017 James E. McDonough
About this chapter
Cite this chapter
McDonough, J.E. (2017). Observer Design Pattern. In: Object-Oriented Design with ABAP. Apress, Berkeley, CA. https://doi.org/10.1007/978-1-4842-2838-8_13
Download citation
DOI: https://doi.org/10.1007/978-1-4842-2838-8_13
Published:
Publisher Name: Apress, Berkeley, CA
Print ISBN: 978-1-4842-2837-1
Online ISBN: 978-1-4842-2838-8
eBook Packages: Professional and Applied ComputingProfessional and Applied Computing (R0)Apress Access Books