RE: Memory Management: Revamped Engine Example

• Subject: RE: Memory Management: Revamped Engine Example
• From: Jordan Evans <email@hidden>
• Date: Sun, 1 Jan 2006 02:12:41 -0800 (PST)
• Delivered-to: email@hidden
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1.  I added a EnginePart Class and made each engine
part a subclass of the EnginePart Class.
2.  I removed the superfluous pointer.
3.  I added the NSMutableIndexSet.

Thanks Chris Hanson.

I have to get some more practice in, but I think the
NSIndexSet is going to be handy.  Is there anything
else that could be done to straighten this thing up?

Source code attached.

#import <Foundation/Foundation.h>

//EngineParts Class
@interface EngineParts : NSObject{} @end
@implementation EngineParts @end

//Individual Sub-Classes of EngineParts Class
@interface CombustionChamber : EngineParts{} @end
@implementation CombustionChamber @end

@interface Compressor : EngineParts{} @end
@implementation Compressor @end

@interface FuelInjector : EngineParts{} @end
@implementation FuelInjector @end

@interface Shaft : EngineParts{} @end
@implementation Shaft @end

@interface Turbine : EngineParts{} @end
@implementation Turbine @end


@interface Engine : NSObject
{
	 NSMutableArray *enginePartsArray;
}

- (id)init;
- (void)maintenance:(NSMutableIndexSet*)badParts;

@end


@implementation Engine

- (id)init;
{
	int i;
	
	[super init];
	 
	enginePartsArray = [[NSMutableArray alloc] init];
	 
	[enginePartsArray addObject:[[CombustionChamber
alloc] init]];
	[enginePartsArray addObject:[[Compressor alloc]
init]];
	[enginePartsArray addObject:[[FuelInjector alloc]
init]];
	[enginePartsArray addObject:[[FuelInjector alloc]
init]];
	[enginePartsArray addObject:[[Shaft alloc] init]];
	[enginePartsArray addObject:[[Turbine alloc] init]];
	
	for( i=0; i<[enginePartsArray count]; i++ )
		[[enginePartsArray objectAtIndex:i] release];
	 
	return self;
}

- (void)dealloc;
{
	[enginePartsArray release];
        
	[super dealloc];
}

- (void)maintenance:(NSMutableIndexSet*)badParts
{
	int i, part, partCount;
	 
	id PartClass;

	NSLog(@"Parts before maintenance:\n");
	for(i=0; i<[enginePartsArray count]; i++)
		NSLog(@"Part%i:  %@", i, [[enginePartsArray
objectAtIndex:i] description]);
	
	partCount = [badParts count];
	
	for( i=0; i<partCount; i++ )
	{
		part = [badParts firstIndex];
		
		PartClass = [[enginePartsArray objectAtIndex:part]
class];
		
		[enginePartsArray replaceObjectAtIndex:[badParts
firstIndex] withObject:[[PartClass alloc] init]];
		
		[[enginePartsArray objectAtIndex:part] release];
		
		[badParts removeIndex:part];
	}
        
	NSLog(@"Parts after maintenance:\n");
	for(i=0; i<[enginePartsArray count]; i++)
		NSLog(@"Part%i:  %@", i, [[enginePartsArray
objectAtIndex:i] description]);
		
		printf("\n");
}

@end

int main (int argc, const char *argv[])
{
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc]
init];
	
	Engine *myEngine = [[[Engine alloc] init]
autorelease];
	 
	NSMutableIndexSet *badPartsIndexSet1 =
[[NSMutableIndexSet alloc] init];
	NSMutableIndexSet *badPartsIndexSet2 =
[[NSMutableIndexSet alloc] init];
	
	[badPartsIndexSet1 addIndex:0];
	[badPartsIndexSet1 addIndex:1];
	
	[badPartsIndexSet2 addIndex:5];
	 
	[myEngine maintenance:badPartsIndexSet1];
	[myEngine maintenance:badPartsIndexSet2];

	[badPartsIndexSet1 release];
	[badPartsIndexSet2 release];

	[pool release];
	 
     return 0;
}


	
		
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Attachment: MemoryEngine.m
Description: 1471405315-MemoryEngine.m

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