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Jonathan,
On 6/14/2009 1:01 PM, Jonathan Mast wrote:
> class BeanBag {
> private static SomeBean someBean = null;
>
> public static synchronized getSomeBean() {
> if (someBean == null) someBean = new SomeBean();
> return someBean;
> }
> }
You can get a significant performance improvement by doing this instead:
private static final SomeBean someBean = new SomeBean();
public static getSomeBean() {
return someBean;
}
Of course, if you're going for delayed/lazy instantiation, you're not
going to get it, but you at least drop the penalty for synchronization.
> I have now numerous Servlets, JSPs and POJOs that use BeanBag to obtain
> singleton instances of my beans. Its worked great for me.
Remember that object instantiation isn't really a big deal. If you have
complex object /initialization/, then it may be worth using a
"singleton" (virtually impossible in the webapp realm unless you are
very careful), flyweight, pool, or other pattern to re-use objects yet
still retain a high degree of throughput.
- -chris
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