On 05/10/15 8:13 AM, Andre wrote:
I want to share my experiences with D and the platform as a service
solution Cloud Foundry. Cloud Foundry supports any development language
as long it is runnable on Linux 64 bit and the application has a http
Server listening on a port which Cloud Foundry provides you using system
environment variable PORT.
I am used to develop on Windows. Using VirtuaBox I created a Linux
virtual machine. I defined a shared directory between my windows host
system and the Linux virtual machine. In Addition I use Putty as SSH
client. In the Putty terminal I execute dub and after that the Cloud
Foundry console application to push the binary to the cloud.
I tried different http servers available for D. At the end I decided to
build my own.
vibe-d: The linking time of a vibe-d application on a Linux system is
quite high, I think this is due to the dependencies like pthreads and so
on. Also the binary size is also quite high. As far as I remember around
20 mb for a test application. The size matters as you have to upload the
application again and again. Cloud Foundry provides some shared objects
libraries. In case you have special requirements like pthreads you must
create a build pack. With a build pack you can download external
dependencies and install them while pushing the binary to the cloud.
There already exists build packs for vibe-d but they are outdated. They
run a long time and then stops.
From windows I know vibe-d is a great library but on Linux out of the
box it doesn't make fun due to the usage of external dependencies.
I also had a look at the arsdnet http server. But I didn't achieved to
get my scenario running. In addition to my http server component I have
a thread which executes 10 some database calls and some http requests.
If I am not completely wrong the scenario of starting a thread in
addition to the main server thread is not supported unless I duplicate a
big amount of coding from the template "main" of the arsdnet http
server component.
In the end I build my own very simple http server component. By using
the pure phobos library compiling and linking is super fast and the size
of the full application is around 8 mb. Compile, link and pushing to the
cloud is possible in less than a minute.
In sum, it is just fun to develop cloud applications with D!
Vibe.d has a provider called libasync. Libasync is fully implemented in
D. You probably should have tried that at least.
Although I still would recommend trying it ;) It's a lot better then
what we have in Phobos.
