On Aug 11, 2010, at 1:41 PM, Farrukh Ijaz wrote: > > > Sent from my iPad > > On 11-Aug-2010, at 7:35 PM, Chuck Hill <[email protected]> wrote: > >> >> On Aug 11, 2010, at 2:11 AM, Farrukh Ijaz wrote: >> >>> Hi All, >>> >>> Is it safe to invoke editingContext().saveChange() or >>> editingContext().revert() in a method that is used through NSSelector and >>> invoked by the NSNotificationCenter on postNotification()? >> >> >> That likely depends on which notification. > > Okay, here is the real scenario. I have developed a Workflow Engine which is > capable to run multiple workflows in parallel in their individual threads. > Each workflow has methods as start(), stop(), suspend(), and resume(). The > behavior of these methods is understood. Everything remains in memory. Now in > order to persist their state I have created a corresponding entity. There are > two columns of the entity, status and serializedInstance which change at any > stage and that is depending upon user actions and workflow code. > > I have a workflow management dashboard which provides ability to view all the > workflows defined in the system and to start, stop, resume and suspend. When > I start the workflow, I call the method start() of the workflow entity, which > internally triggers the associated workflow's start() method and also > registers the entity to receive notifications from the workflow thread. The > workflow thread post notifications such as when it completes the job or > explicitly stopped, resumed, suspended etc. So upon these notifications, the > workflow entity's onNotify() method is invoked which in turn based on the > message, modifies the status column and serializedInstance column value and > invokes, editingContext().saveChanges() inside the onNotify() method.
You will have to make sure that the EC is locked before touching any of the entity's persistent values or calling saveChanges() > > I guess the story is too long but it is working fine so far. I just want to > confirm that if this does not break anything at any stage or cause a deadlock > situation? > >> >> Chuck >> >> -- >> Chuck Hill Senior Consultant / VP Development >> >> Practical WebObjects - for developers who want to increase their overall >> knowledge of WebObjects or who are trying to solve specific problems. >> http://www.global-village.net/products/practical_webobjects >> >> >> >> >> >> >> -- Chuck Hill Senior Consultant / VP Development Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems. http://www.global-village.net/products/practical_webobjects
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