Helfer Nonescalable

Jan Burse, erstellt 02. Jun 2019
package matula.util.misc;
import java.util.concurrent.Semaphore;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
/**
* <p>This class provides a unslotted and non-escalable read write pair.</p>
* <p>The class is implemented on top of the concurrent semaphore.</p>
* <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 Nonescalable extends Semaphore implements ReadWriteLock {
public static final int WRITE_PERMIT = 0x01000000;
final NonescalableRead read = new NonescalableRead(this);
final NonescalableWrite write = new NonescalableWrite(this);
/**
* <p>Create a non-esalable read write lock.</p>
*/
public Nonescalable() {
super(WRITE_PERMIT);
}
/**
* <p>Retrieve the read lock.</p>
*
* @return The read lock.
*/
public Lock readLock() {
return read;
}
/**
* <p>Retrieve the write lock.</p>
*
* @return The write lock.
*/
public Lock writeLock() {
return write;
}
}

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