Helfer Counter

Jan Burse, erstellt 13. Okt 2018
package jekpro.frequent.basic;
import java.util.concurrent.atomic.AtomicInteger;
/**
* <p>This class provides an atomic integer counter.</p>
* Warranty & Liability
* To the extent permitted by applicable law and unless explicitly
* otherwise agreed upon, XLOG Technologies GmbH makes no warranties
* regarding the provided information. XLOG Technologies GmbH assumes
* no liability that any problems might be solved with the information
* provided by XLOG Technologies GmbH.
* <p/>
* Rights & License
* All industrial property rights regarding the information - copyright
* and patent rights in particular - are the sole property of XLOG
* Technologies GmbH. If the company was not the originator of some
* excerpts, XLOG Technologies GmbH has at least obtained the right to
* reproduce, change and translate the information.
* <p/>
* Reproduction is restricted to the whole unaltered document. Reproduction
* of the information is only allowed for non-commercial uses. Selling,
* giving away or letting of the execution of the library is prohibited.
* The library can be distributed as part of your applications and libraries
* for execution provided this comment remains unchanged.
* <p/>
* Restrictions
* Only to be distributed with programs that add significant and primary
* functionality to the library. Not to be distributed with additional
* software intended to replace any components of the library.
* <p/>
* Trademarks
* Jekejeke is a registered trademark of XLOG Technologies GmbH.
*/
public final class Counter {
private final AtomicInteger counter = new AtomicInteger();
/**
* <p>Increment this counter and return the old value.</p>
*
* @return The old value.
*/
public int next() {
int oldcount, newcount;
AtomicInteger atomic = counter;
do {
oldcount = atomic.get();
newcount = oldcount + 1;
} while (!atomic.compareAndSet(oldcount, newcount));
return oldcount;
}
}

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