IOSID生成器 - 王朝网络宽屏版

// IdGenerator.m

#import "IdGenerator.h"

static long long time_stamp = 0;

static long long time_stamp_now = 0;

static NSMutableArray *temp = NULL;

static NSNumber *random_n = NULL;

static NSLock *theLock = NULL;

@implementation IdGenerator

* 获取下一个Id

+ (long long)next{

if(theLock == NULL)

theLock = [[NSLock alloc]init];

if(temp == NULL)

temp = [[NSMutableArray alloc]init];

@synchronized(theLock){

time_stamp_now = [[NSDate date] timeIntervalSince1970];

if(time_stamp_now != time_stamp){

//清空缓存，更新时间戳

[temp removeAllObjects];

time_stamp = time_stamp_now;

}

//判断缓存中是否存在当前随机数

while ([temp containsObject:(random_n = [NSNumber numberWithLong:arc4random() % 8999 + 1000])])

;

if ([temp containsObject:random_n]) {

return -1;

}

[temp addObject:[NSNumber numberWithLong:[random_n longValue]]];

}

return (time_stamp * 10000) + [random_n longValue];

}

@end

不重复的Id生成器，理论上每秒钟最多可以生成8999条Id，实际上每秒钟约能生成6000条Id。

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