前言
有时候在调用多个模块时，会对同一个API进行多次请求，但因为内容都是一样的，所以最好就是加上锁，防止重复请求造成网络资源浪费
处理方法
@synchronized (self) {//加锁，避免数组重复创建添加等问题
static NSMutableArray * successBlocks;//用数组保存回调
static NSMutableArray * failureBlocks;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{//仅创建一次数组
successBlocks = [NSMutableArray new];
failureBlocks = [NSMutableArray new];
});
if (success) {//每调用一次此函数，就把回调加进数组中
[successBlocks addObject:success];
}
if (failure) {
[failureBlocks addObject:failure];
}
static BOOL isProcessing = NO;
if (isProcessing == YES) {//如果已经在请求了，就不再发出新的请求
return;
}
isProcessing = YES;
[self callerPostTransactionId:transactionId parameters:dic showActivityIndicator:showActivityIndicator showErrorAlterView:showErrorAlterView success:^(id responseObject) {
@synchronized (self) {//网络请求的回调也要加锁，这里是另一个线程了
for (successBlock eachSuccess in successBlocks) { //遍历回调数组，把结果发给每个调用者
eachSuccess(responseObject);
}
[successBlocks removeAllObjects];
[failureBlocks removeAllObjects];
isProcessing = NO;
}
} failure:^(id data) {
@synchronized (self) {
for (failureBlock eachFailure in failureBlocks) {
eachFailure(data);
}
[successBlocks removeAllObjects];
[failureBlocks removeAllObjects];
isProcessing = NO;
}
}];
}
