//

 //  ConcurrentOperation.m

 //  MYUtilities

 //

 //  Created by Jens Alfke on 2/5/08.

 //  Copyright 2008 Jens Alfke. All rights reserved.

 //

 #import "ConcurrentOperation.h"

 // See file:///Developer/Documentation/DocSets/com.apple.ADC_Reference_Library.CoreReference.docset/Contents/Resources/Documents/documentation/Cocoa/Reference/NSOperation_class/Reference/Reference.html#//apple_ref/doc/uid/TP40004591-RH2-DontLinkElementID_4

 @implementation ConcurrentOperation

 - (BOOL) isConcurrent {return YES;}

 - (void) main

 {

     Assert(NO,@"Shouldn't call -main method of ConcurrentOperation");

 }

 - (BOOL) isExecuting

 {

     return _isExecuting;

 }

 - (BOOL) isFinished

 {

     return _isFinished;

 }

 - (void) start

 {

     // don't call super!

     Log(@"Starting %@",self);

     [self willChangeValueForKey: @"isExecuting"];

     _isExecuting = YES;

     [self didChangeValueForKey: @"isExecuting"];

 }

 - (void) finish

 {

     Log(@"Finished %@",self);

     [self willChangeValueForKey: @"isExecuting"];

     [self willChangeValueForKey: @"isFinished"];

     _isExecuting = NO;

     _isFinished = YES;

     [self didChangeValueForKey: @"isFinished"];

     [self didChangeValueForKey: @"isExecuting"];

 }

 - (void) cancel

 {

     Log(@"Canceling %@",self);

     [super cancel];

     if( _isExecuting ) {

         [self willChangeValueForKey: @"isExecuting"];

         _isExecuting = NO;

         [self didChangeValueForKey: @"isExecuting"];

     }

 }

 @end