Multiton - registry of singletons

Multiton - registry of singletons
http://en.wikipedia.org/wiki/Multiton_pattern

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	import java.util.HashMap;
	import java.util.Map;
	public class FooMultiton {
	private static final Map<Object, FooMultiton> instances = new HashMap<Object, FooMultiton>();
	private FooMultiton() {
	// no explicit implementation
	}
	public static synchronized FooMultiton getInstance(Object key) {
	// Our "per key" singleton
	FooMultiton instance = instances.get(key);
	if (instance == null) {
	// Lazily create instance
	instance = new FooMultiton();
	// Add it to map
	instances.put(key, instance);
	}
	return instance;
	}
	// other fields and methods ...
	}

view raw FooMultiton.java hosted with ❤ by GitHub

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