因此,我将块操作存储到 nsmutabledictionary 中,然后在 websocket 上返回响应时调用它们。这会将异步请求转换为块语法。这是精简的代码:
- (void)sendMessage:(NSString*)message responseAction:(void (^)(id))responseAction
{
NSString *correlationID = (NSString*)[[message JSONValue] objectForKey:@"correlationId"];
[self.messageBlocks setObject:responseAction forKey:correlationID];
NSLog(@"Sending message: %@", correlationID);
[webSocket send:message];
}
- (void)webSocket:(SRWebSocket *)wsocket didReceiveMessage:(id)message;
{
NSString *correlationID = (NSString*)[[message JSONValue] objectForKey:@"correlationId"];
NSLog(@"Incoming message. CorrelationID: %@", correlationID);
void (^action)(id) = nil;
if (correlationID) {
action = [messageBlocks objectForKey:correlationID];
if (action) action([message JSONValue]);
[messageBlocks removeObjectForKey:correlationID];
}
}
注意:服务器使用随请求发送的相关 ID 进行响应。因此,每个响应都通过该 ID 链接到每个请求。
这工作得很好,比我预期的要好。我的问题是,以这种方式运行块是否安全?正在调用 [messageBlocks removeObjectForKey:correlationID];足以将其从内存中删除。我记得在 ARC 之前,block_release 是一个选项。