/*

File: QueueController.m

Abstract: Implementation file for the QueueController class. This class

acts as a controller/manager for the Queue class. When initialized, it

will create two Queue objects, a "free" queue and a "filled" queue. The

"free" queue contains objects that are available for use by the client. The

"filled" queue contains objects that have been "used" (it is up to the

client to define such usage). Objects may be added to both the "free" and

"filled" queues, and objects may be removed from both queues.

Version: 1.0

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND

 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL

 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

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*/

#import "QueueController.h"

#import "Queue.h"

#import "FrameReader.h"

@implementation QueueController

- (id) init

{

    //Make sure client goes through designated initializer

    [self doesNotRecognizeSelector:_cmd];

    return nil;

}

// Initialize a QueueController object with reader objects -- each

// of which has the specified OpenGL context and pixel width/height.

//

// Each QueueController object contains a "free" queue and

// a "filled" queue.

- (id) initWithReaderObjects:(unsigned)objectCount aContext:(NSOpenGLContext*)context pixelsWide:(unsigned)width pixelsHigh:(unsigned)height 

{

    if (self = [super init])

    {

        // initialize the "free" and "filled" queues

        mFreeQ = [[Queue alloc] init];

        mFilledQ = [[Queue alloc] init];

        mFreeQMutex = [[NSString alloc] initWithString:@"freeQMutex"];

        mFilledQMutex = [[NSString alloc] initWithString:@"filledQMutex"];

        // now fill the "free" queue with reader objects

        int i;

        for (i=0; i<objectCount; ++i)

        {

            FrameReader *readerObj;

            readerObj = [[FrameReader alloc] initWithOpenGLContext:context pixelsWide:width pixelsHigh:height queueController:self];

            if (readerObj)

            {

                [self addItemToFreeQ:readerObj];

                [readerObj release];

            }

        }

    }

    return self;

}

// Add the specified item to the "free" queue

-(void)addItemToFreeQ:(id)anItem

{

    @synchronized(mFreeQMutex)

    {

        [mFreeQ addItem:anItem];

    }

}

// Add the specified item to the "filled" queue

-(void)addItemToFilledQ:(id)anItem

{

    @synchronized(mFilledQMutex)

    {

        [mFilledQ addItem:anItem];

    }

}

// Removes the oldest item from the "free" queue

-(id)removeOldestItemFromFreeQ

{

    id anObject = nil;

    @synchronized(mFreeQMutex)

    {

        anObject = [mFreeQ returnAndRemoveOldest];

    }

    return (anObject);

}

// Remove the oldest item from the "filled" queue

-(id)removeOldestItemFromFilledQ

{

    id anObject = nil;

    @synchronized(mFilledQMutex)

    {

        anObject = [mFilledQ returnAndRemoveOldest];

    }

    return (anObject);

}

// Cleanup - free our queue resources

- (void) dealloc

{

    [super dealloc];

    [mFreeQ release];

    [mFilledQ release];

    [mFreeQMutex release];

    [mFilledQMutex release];    

}

@end