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Considerations for creating custom controllers and controller extensions

When you are creating custom controllers and controller extensions, keep the following consideration in mind:
  • The most important thing to keep in your mind is Apex governor limits.
  • Apex classes can be run in the system mode and user mode by using without sharing and with sharing respectively. Sensitive data can be exposed without sharing controllers.
  • The webservice methods must be defined as global. All other methods are public.
  • Try to access the database in less time by using sets, maps, or lists. This will increase the efficiency of your code.
  • Apex methods and variables are not instantiated in a guaranteed order.
  • You cannot implement Data Manipulation Language (DML) in the constructor method of a controller.
  • You cannot define the @future annotation for any getter method, setter method, or constructor method of a controller.
  • Primitive data types (String, Integer, and so on) are passed by value and non-primitive Apex data types (list, maps, set, sObject, and so on) are passed by the reference to a component's controller.

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