Win a copy of Microservices Testing (Live Project) this week in the Spring forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Tim Cooke
  • Ron McLeod
  • Jeanne Boyarsky
  • Paul Clapham
Sheriffs:
  • Liutauras Vilda
  • Henry Wong
  • Devaka Cooray
Saloon Keepers:
  • Tim Moores
  • Stephan van Hulst
  • Tim Holloway
  • Al Hobbs
  • Carey Brown
Bartenders:
  • Piet Souris
  • Mikalai Zaikin
  • Himai Minh

which method is idempotent?

 
Greenhorn
Posts: 9
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
hi all,
which methode is called idempotent. why ?

Expalin?
 
Sheriff
Posts: 67650
173
Mac Mac OS X IntelliJ IDE jQuery TypeScript Java iOS
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Sounds like a homework question to me. What's your answer?
 
Ranch Hand
Posts: 8944
Firefox Browser Spring Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
HTTP Get is supposed to be idempotent.
 
Ranch Hand
Posts: 294
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
It doesn't look like idempotent for me. I'd rather to have init and destroy as idempotent.
 
Ranch Hand
Posts: 96
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
When talking about idempotent methods, we're 99% of the time referring to the HTTP methods; of which the GET method is supposed to be idempotent by nature. That's not to say that you can't do something wacky in your doGet() method to make it non-idempotent....
 
Ranch Hand
Posts: 72
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Idempotent - A function, is idempotent if, whenever it is applied twice to any element, it gives the same result as if it were applied once.

The idempotent method can be safely repeated.

POST method is considered non-idempotent. The reason is that the POST is supposed to post data to the server, which means it may be used to save the data in persistent location OR to do some action based on that posted data.

Similarly, GET is NOT supposed to update data, but to get data, although we can(and we do) implement GET to update data, by posting data using query string. So, GET may sometimes behave non-idempotently.
 
dema rogatkin
Ranch Hand
Posts: 294
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Right, it's a problem of many applications, because a browser considers get as idempotent and doesn't do repeat calls just uses caching result.
 
Don't get me started about those stupid light bulbs.
reply
    Bookmark Topic Watch Topic
  • New Topic