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I wouldn't say that synchronization is totally unneeded. If the singleton provides access to a shared resource, then some synchronization must take place. I agree that you don't have to synchronize everything, though.

Sergei Tachenov
– Sergei Tachenov

2011-02-12 17:01:33 +00:00
Commented Feb 12, 2011 at 17:01
@Sergey - I agree, what I am trying to expose is that “if in multithreading environment” as the question states; then simply the usage synchronization in some cases will not be the best. Certainly you can do that if the instantiation isn’t causing substantial overhead in the application. But if it does you might want to decrease this performance impact by using other options like either moving to an eagerly created instance or “double-check locking” to reduce the use of synchronization.

Bartzilla
– Bartzilla

2011-02-12 18:48:55 +00:00
Commented Feb 12, 2011 at 18:48
unfortunately, DCL is completely broken in Java.

Sergei Tachenov
– Sergei Tachenov

2011-02-12 18:55:33 +00:00
Commented Feb 12, 2011 at 18:55
@Sergey - If you use a JVM other than Java 5 consider other methods (other than DCL) to implement Singleton. Head First Design Patterns. Item 5: Dealing with multithreading. Here is a thread that shows how to implement DCL in Java 5 or higher How to solve DCL in java taken from Effective Java, Second Edition which is basically the purpose of DCL

Bartzilla
– Bartzilla

2011-02-12 19:33:49 +00:00
Commented Feb 12, 2011 at 19:33

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