'IODH'에 해당되는 글 1건

  1. 2012.11.23 [Java] Initialization on demand holder idiom (4)


When to use it

Use this pattern if the initialization of the class is expensive and it cannot be done safely at class-loading time and the initialization is highly concurrent. The crux of the pattern is the safe removal of the synchronization overhead associated with accessing a singleton instance.

[edit]When not to use it

Avoid this idiom if the construction of INSTANCE can fail. If construction of INSTANCE fails, an invocation of Something.getInstance() will result in a java.lang.NoClassDefFoundError error. Handling, or mishandling, of these types of construction initialization failures is a common criticism of this idiom and the singleton pattern in general.

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