Re: [Wonder-disc] Locking

[Mike S. <ms...@md...>]

hmm .. looking at that code in Wonder, it's:

					EODatabaseContext._EOAssertSafeMultiThreadedAccess(dbc);
					dbc.lock();

seems a little weird and unnecessary?

On Apr 26, 2007, at 8:39 AM, Frank Stock wrote:

> Hi,
>
> When control the Locking in one of my routines with an update I get  
> the following:
>
> 28079 [Thread-1] DEBUG NSLog  - *** EODatabaseContext: access  
> without lock!
> [2007-04-26 14:28:48 CEST] <Thread-1> java.lang.Exception: This is  
> not a real exception, just a stack trace of the location of the  
> missing lock:
> 	at  
> com.webobjects.eoaccess.EODatabaseContext._EOAssertSafeMultiThreadedAc 
> cess(EODatabaseContext.java:4452)
> 	at er.extensions.ERXObjectStoreCoordinatorSynchronizer 
> $ProcessChangesQueue._process 
> (ERXObjectStoreCoordinatorSynchronizer.java:429)
> 	at er.extensions.ERXObjectStoreCoordinatorSynchronizer 
> $ProcessChangesQueue.process 
> (ERXObjectStoreCoordinatorSynchronizer.java:450)
> 	at er.extensions.ERXObjectStoreCoordinatorSynchronizer 
> $ProcessChangesQueue.run(ERXObjectStoreCoordinatorSynchronizer.java: 
> 524)
> 	at java.lang.Thread.run(Thread.java:613)
>
> This is all the information I get.
>
> This is the routine, sorry for the long code. It is indicated when  
> the error occures:
>
> 	public void setWebtext_F (String webtext, String language, String  
> value, String edited) {
> 		//ec = session().defaultEditingContext();
> 		ERXEC ec=(ERXEC) ERXEC.newEditingContext();
> 		try{
> 		ec.lock();
> 		EOQualifier aQual;
> 		NSMutableArray qbind;
> 		EOFetchSpecification fs;
> 		
> 		Webtext wObject;
> 		Language lObject;
> 		LanguageWebtext lwObject;
>
> 		if ((null==edited) || (edited.equals("")))
> 			edited = "N";
>
> 		// Bepaal het webtext-object voor de gegeven webtext
> 		qbind=new NSMutableArray();
> 		qbind.addObject(webtext);
> 		aQual = EOQualifier.qualifierWithQualifierFormat("(webtext=% 
> @)",qbind);
> 		fs = new EOFetchSpecification("Webtext",aQual,null);
> 		NSArray arWebtext = ec.objectsWithFetchSpecification(fs);
> 		
> 		try {
> 			wObject=(Webtext)EOUtilities.objectMatchingKeyAndValue 
> (ec,"Webtext","webtext",webtext);
> 		}
> 		catch (Exception e) {
> 			wObject=null;
> 		}
> 		// In principe mag er maximum 1 resultaat zijn
> 		
> 		if (null ==wObject) {
> 			// Indien er geen resultaat is -> maak eerst deze webtext aan
> 			wObject = new Webtext();
> 			wObject.setWebtext(webtext);
> 			ec.insertObject(wObject);
> 			wObject.validateForSave();
> 			ec.saveChanges();
> 		}
>
> 		// Bepaal het language-object voor de gegeven language
> 				
> 		try {
> 			lObject=(Language)EOUtilities.objectMatchingKeyAndValue 
> (ec,"Language","language",language);
> 		}
> 		catch (Exception e) {
> 			lObject=null;
> 		}
> 		
> 		if (null==lObject) {
> 			// Indien er geen resultaat is -> maak eerst deze language aan
> 			lObject = new Language();
> 			ec.insertObject(lObject);
> 			lObject.setLanguage(language);
> 			lObject.validateForSave();
> 			ec.saveChanges();
> 		}
> 		
> 		// Bepaal het language_webtext-object voor de combinatie van  
> webtext-object en language-object
> 		qbind=new NSMutableArray();
> 		qbind.addObject(language);
> 		aQual = EOQualifier.qualifierWithQualifierFormat("(language=% 
> @)",qbind);
> 		NSArray arLanguageWebText = EOQualifier.filteredArrayWithQualifier 
> (wObject.languagewebtext(),aQual);
>
> 		// In principe mag er maximum 1 resultaat zijn
> 		int iLW = arLanguageWebText.count();
> 		if (iLW > 0) {
> 			// pas de waarde aan voor deze languagewebtext
> 			for (int i=0;i<iLW;i++) {
> 				lwObject = (LanguageWebtext)arLanguageWebText.objectAtIndex(i);
> 				lwObject.setValue(value);
> 				lwObject.setEdited(edited);
> 				lwObject.validateForSave();
> ------->				ec.saveChanges();   <----------------------- Here Is  
> the lock
> 			}
> 		} else {
> 			// er bestaat nog geen dergelijke languagewebtext
> 			lwObject = new LanguageWebtext();
> 			lwObject.setValue(value);
> 			lwObject.setLanguage(lObject);
> 			lwObject.addObjectToBothSidesOfRelationshipWithKey 
> (lObject,"language");
> 			lwObject.setWebtext(wObject);
> 			lwObject.addObjectToBothSidesOfRelationshipWithKey 
> (wObject,"webtext");
> 			lwObject.setEdited(edited);
> 			ec.insertObject(lwObject);
> 			ec.saveChanges();
> 		}
> 		
> 		}
> 		finally {
> 			ec.unlock();
> 			ec.dispose();
> 		}
> 	}
>
>
> Thanks,
> Frank Stock
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