public InvokeFuture addInvokeFuture(InvokeFuture future) {
        return this.invokeFutureMap.putIfAbsent(future.invokeId(), future);
    }
Add an InvokeFuture

@param future InvokeFuture
@return previous InvokeFuture with same invoke id
src/main/java/com/alipay/remoting/Connection.java