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A multipurpose java library

There is a newer version: 12.3.1

package gate.cache;

import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Supplier;

class LazyCache implements Cache
{

	private final Supplier supplier;
	private final AtomicReference value = new AtomicReference<>();

	LazyCache(Supplier supplier)
	{
		this.supplier = supplier;
	}

	@Override
	public T get()
	{
		return value.updateAndGet(e -> e != null ? e : supplier.get());
	}

}