Helfer "DefinedGroupLocal"

Jan Burse, erstellt 17. Feb 2021
package jekpro.model.inter;
import jekpro.model.pretty.AbstractSource;
import jekpro.model.rope.Bouquet;
import matula.util.data.ListArray;
import java.util.concurrent.locks.ReadWriteLock;
/**
* <p>The delegate class for group local delegate.</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.
*/
final class DefinedGroupLocal extends AbstractDefined {
private final int seqid;
/**
* <p>Create a thread local group predicate.</p>
*
* @param s The sequence id.
* @param flags The store flags.
*/
DefinedGroupLocal(int s, int flags) {
super(flags);
seqid = s;
}
/**************************************************************/
/* Variation Points */
/**************************************************************/
/**
* <p>Shrink this predicate from the store for a source.</p>
*
* @param pick The predicate.
* @param scope The source.
*/
public void shrinkPredicate(Predicate pick, AbstractSource scope) {
/* do nothing */
}
/**
* <p>Release this predicate from the store.</p>
*
* @param pick The predicate.
*/
public void releasePredicate(Predicate pick) {
pick.getSource().getStore().foyer.releaseHole(seqid);
}
/**
* <p>Retrieve the read write lock.</p>
*
* @param en The engine.
* @return The read write lock.
*/
public ReadWriteLock getLock(Engine en) {
LocalBlocking ep = defineLocalBlocking(en);
return ep.lock;
}
/**
* <p>Retrieve the clause and index bouquet.</p>
*
* @param en The engine.
* @return The read write lock.
*/
public Bouquet getBouquet(Engine en) {
LocalBlocking ep = defineLocalBlocking(en);
return ep.cr;
}
/***********************************************************/
/* Groupe State */
/***********************************************************/
/**
* <p>Retrieve an engine private locked.</p>
*
* @param en The engine.
* @return The engine private locked.
*/
private LocalBlocking defineLocalBlocking(Engine en) {
LocalBlocking ep = prefetchLocalBlocking(en);
if (ep != null)
return ep;
synchronized (en.store) {
ListArray<LocalBlocking> privs = en.store.privates;
if (privs == null) {
privs = new ListArray<>();
en.store.privates = privs;
}
while (seqid >= privs.size())
privs.add(null);
ep = privs.get(seqid);
if (ep == null) {
ep = new LocalBlocking(this);
privs.set(seqid, ep);
} else if (ep.del != this) {
ep.cr = new Bouquet();
ep.del = this;
}
}
return ep;
}
/**
* <p>Prefetch an engine private locked.</p>
*
* @param en The engine.
* @return The engine private locked.
*/
private LocalBlocking prefetchLocalBlocking(Engine en) {
ListArray<LocalBlocking> privs = en.store.privates;
if (privs == null)
return null;
if (seqid >= privs.size())
return null;
LocalBlocking ep = privs.get(seqid);
if (ep == null)
return null;
if (ep.del != this)
return null;
return ep;
}
}

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