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Should services always return DTOs, or can they also return domain models?
...o, in which case the answer is that they should not return DTOs. I suggest reading chapter 4 in the blue book, titled "Isolating the Domain".
In that chapter, Evans says the following about the layers:
Partition a complex program into layers. Develop a design within each layer that is cohesive ...
Is there a difference between copy initialization and direct initialization?
... that when the copy constructor is explicit, then the first one will fail. Read 8.6/14
double b1 = 0.5;
double b2(0.5);
This is doing the same because it's a built-in type (this means not a class type here). Read 8.6/14.
A c1;
A c2 = A();
A c3(A());
This is not doing the same. The first defau...
How to get .pem file from .key and .crt files?
...
Your keys may already be in PEM format, but just named with .crt or .key.
If the file's content begins with -----BEGIN and you can read it in a text editor:
The file uses base64, which is readable in ASCII, not binary format. The certifica...
Why use getters and setters/accessors?
...ink?) allows you to define properties as 1st class citizens where they can read / write a field directly initially but - should you need it - do so via getter / setter methods as well. Mucho convenient. Java, alas, does not - not to mention the javabeans standard which forces you to use getters / se...
libevent+protobuf轻松搭建tcpserver - C/C++ - 清泛网 - 专注C/C++及内核技术
...ent*)malloc(sizeof(struct event));
event_set(ev_accept, listen_fd, EV_READ|EV_PERSIST, on_accept, (void*)accept_param);
event_add(ev_accept, NULL);
return 0;
}
void on_accept(int fd, short ev, void *arg)
{
int client_fd = accept(fd, (struct sockaddr*)&client_addr, &client_l...
HashMap with multiple values under the same key
...ple.add(new Person("Bob Jones"));
peopleByForename.put("Bob", people);
// read from it
List<Person> bobs = peopleByForename["Bob"];
Person bob1 = bobs[0];
Person bob2 = bobs[1];
The disadvantage with this approach is that the list is not bound to exactly two values.
2. Using wrapper class
...
Send string to stdin
...ut from a command, like
diff <(ls /bin) <(ls /usr/bin)
or you can read as
while read line
do
echo =$line=
done < some_file
or simply
echo something | read param
share
|
improve t...
What is the difference between NaN and None?
I am reading two columns of a csv file using pandas readcsv() and then assigning the values to a dictionary. The columns contain strings of numbers and letters. Occasionally there are cases where a cell is empty. In my opinion, the value read to that dictionary entry should be None but instead ...
Equivalent to 'app.config' for a library (DLL)
...
You can have separate configuration file, but you'll have to read it "manually", the ConfigurationManager.AppSettings["key"] will read only the config of the running assembly.
Assuming you're using Visual Studio as your IDE, you can right click the desired project → Add → New item...
RESTful Services - WSDL Equivalent
I have been reading about REST and SOAP, and understand why implementing REST can be beneficial over using a SOAP protocol. However, I still don't understand why there isn't the "WSDL" equivalent in the REST world. I have seen posts saying there is "no need" for the WSDL or that it would be redund...