Jump to content
Sign in to follow this  
RedHawkLuffy

[Tutorial] Singleton Pattern

Recommended Posts

Hi, I'm just posting this tutorial for people who want to structure their application in a cleaner more environmentally friendly way.

A lot of people tend to static variables which is not terrible but if it can be avoided, it should be also I've seen some code that creates a new object for every class when they only need one instance of it which the Singleton Pattern takes care of.

The singleton pattern restricts instantiation of a class to ONE object. This is useful if you need to use an object in every one of your classes like a Variables object but don't want to keep creating a new object every time.

It's fairly simple to implement.

http://pastebin.com/mukKN5pJ

It basically takes advantage of a private constructor. So to create an object it has to be done inside the class which is done by the method getInstance(); Also it is synchronized and therefore thread-safe of course.

To get the instance simply call

Singleton singleton = Singleton.getInstance();

On the first call it will instantiate the object, and every other call it will simply return the instance that was already instantiated.

For more info: https://en.wikipedia.org/wiki/Singleton_pattern

The wikipedia page shows different ways you can implement the singleton pattern.

 

  • Like 2

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

  • Our picks

    • This update will:

      Fix GE inventory item positioning bug


      Fix broken object hooks
        • Like
      • 21 replies
    • This release will:

      Fix some ClosedChannelException bug


      Fix bug in RSObject#getAllTiles


      Add game tab support for "Kourend Favour"
        • Like
      • 15 replies
    • This release will:

      Fix Settings UI placement bug


      Fix game object location bug


      Fix small layout bug making the client shift up and down


      Fix client crashing bug where loading the client with a small display area will cause the client to crash


      Fix annoying Linux bug relating to painting events and peers


      Fix settings saving bug where settings are saved to disk more often than they should


      Fix RSInterface#isBeingDrawn bug affecting a limited amount of people


      Drop Java 1.7 bytecode version for 1.8


      Important: Since the downloadable RS client uses Java 7, it will no longer be compatible with Looking Glass. To make up for this, we will add support for using other clients such as RuneLite (at a later date).


      This change was necessary to allow us to use Java 8 syntax. It also paves the way for Java 9/10/11 support.
        • Like
      • 40 replies
    • This update will:

      Fix the RSMenuNode bug which also fixes the bug with bank opening


      Fix the incorrect object positions bug


      Fix and re-enable the LG Objects API Accelerator


      Fix the RSObject#getAllTiles bug
        • Like
      • 22 replies
    • Try our development release by checking "Development Release" on the TRiBot Loader. Note that these new features are currently in beta.

      This release features:

      Re-sizable mode support for both LG and the regular client


      Slightly improved login bot


      Removed final access modifiers from API classes


      Added RSServer hook wrapper to get the client's cached list of server/world info


      [NEW] Bug fix for intelligent banking


      [NEW] Improvement to the stability of LG over time


      [NEW] Vastly improved the reliability and speed of Screen#getColorAt on both LG and the regular client


      [NEW] Fix LG login problems


      [NEW] Fixed re-sizable mode container bug


      [NEW] Fixed re-sizable mode mouse bug


      [NEW] Use of public constants in the Banking API


      [NEW] Use of other various constants such as Projection#NULL_PT and Screen#EMPTY_COLOR



      More features to come very soon!

      Please test it and let us know here if there are any new bugs introduced in this release.
        • Thanks
        • Like
      • 12 replies
  • Recently Browsing   0 members

    No registered users viewing this page.

×