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OHMRingBuffer.m
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OHMRingBuffer.m
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//
// OHMRingBuffer.m
// OHMTagLib
//
// Created by Tobias Hieta on 2011-02-07.
// Copyright 2011 OHM Interactive. All rights reserved.
//
#import "OHMRingBuffer.h"
@implementation OHMRingBuffer
@synthesize storageSize;
#pragma mark Properties
-(NSUInteger)freeSpace
{
@synchronized(self) {
return storageSize - [storage length];
}
}
-(NSUInteger)usedSpace
{
@synchronized(self) {
return [storage length];
}
}
-(BOOL)canRead
{
@synchronized(self) {
return [storage length] > 0;
}
}
-(BOOL)canWrite
{
@synchronized(self) {
return storageSize > [storage length];
}
}
#pragma mark public
-(id)initWithStorageSize:(NSUInteger)size
{
if ((self = [super init])) {
storageSize = size;
storage = [[OHMData alloc] initWithSize:size];
freeCondition = [NSCondition new];
usedCondition = [NSCondition new];
}
return self;
}
-(NSData*)popData:(NSUInteger)bytes waitForData:(BOOL)wait
{
[usedCondition lock];
while (self.usedSpace < 1) {
if (wait) {
GTMLoggerDebug(@"waiting for data");
[usedCondition wait];
} else {
GTMLoggerDebug(@"not waiting for data");
[usedCondition unlock];
return nil;
}
}
[usedCondition unlock];
NSData *ret;
@synchronized(self) {
ret = [storage popDataWithRange:NSMakeRange(0, MIN (bytes, [storage length]))];
}
[freeCondition broadcast];
return ret;
}
-(BOOL)addData:(NSData *)data waitForFreeSpace:(BOOL)wait
{
if ([data length] > self.storageSize) {
NSAssert(NO, @"You tried to write something to the ringbuffer that doesn't fit %d > %d.", [data length], self.storageSize);
}
[freeCondition lock];
while (self.freeSpace < [data length]) {
if (wait) {
GTMLoggerDebug(@"Waiting for freeSpace");
[freeCondition wait];
} else {
return NO;
}
}
[freeCondition unlock];
@synchronized(self) {
[storage addData:data];
}
[usedCondition broadcast];
return YES;
}
-(void)removeAllData
{
@synchronized(self) {
[storage removeAllData];
}
[freeCondition broadcast];
}
-(void)dealloc
{
[storage release];
[freeCondition release];
[usedCondition release];
[super dealloc];
}
@end