Question
What is double checked locking in Singleton
Answers
Double checked locking is a technique to prevent creating another instance of Singleton when call to getInstance() method is made in multi-threading environment. In Double checked locking pattern as shown in below example, singleton instance is checked two times before initialization.

public static Singleton getInstance()
{
if(_INSTANCE == null)
{
synchronized(Singleton.class)
{
//double checked locking - because second check of Singleton instance with lock
if(_INSTANCE == null)
{
_INSTANCE = new Singleton();
}
}
}
return _INSTANCE;
}



Double checked locking should only be used when you have requirement for lazy initialization otherwise use Enum to implement singleton or simple static final variable.   Your Comment




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