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// // IdGenerator.m // Copyright (c) 2014年 青岛拓宇网络科技有限公司. All rights reserved. // #import "IdGenerator.h" staticlonglongtime_stamp = 0; staticlonglongtime_stamp_now = 0; staticNSMutableArray*temp =NULL; staticNSNumber*random_n =NULL; staticNSLock*theLock =NULL; @implementationIdGenerator /* * 获取下一个Id */ + (longlong)next{ if(theLock ==NULL) theLock = [[NSLockalloc]init]; if(temp ==NULL) temp = [[NSMutableArrayalloc]init]; @synchronized(theLock){ time_stamp_now = [[NSDatedate] 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 = [NSNumbernumberWithLong:arc4random() % 8999 + 1000])]) ; if([temp containsObject:random_n]) { return-1; } [temp addObject:[NSNumbernumberWithLong:[random_n longValue]]]; } return(time_stamp * 10000) + [random_n longValue]; } @end