This is an experiment in the use of the adapter pattern

I have made simple adapters for misultin/mochiweb and cowboy.

The example assumes that misultin/mochiweb and cowboy have been installed and compiled on your machine.

On my machine I have downloaded the latest zip files from github and built the packages

I have added three lines in ${HOME}.erlang so that the erlang loader can find these three programs.

code:add_patha("/Users/joe/nobackup/mochi-mochiweb-af4cb95/ebin"). code:add_patha("/Users/joe/nobackup/extend-cowboy-e7b6e2a/ebin"). code:add_patha("/Users/joe/nobackup/installed/mochi-mochiweb-b7f3693/ebin").

There are three adapters

misultin_adapter.erl cowboy_adapter.erl mochiweb_adapter.erl

Using these adapters we can write server.erl in a generic manner.

I have also made a simple scripting language ehe.

About ehe

Ehe is very simple.

Files with the .ehe extension are assumed to be html files containing embedded Erlang.

The syntax assumes the bit inside the delimiters is a sequence or Erlang expressions. The replacement value of the sequence is the last value in the sequence. Binndings created in the squence are propagated to the next block of embedded erlang.

The Global variable 'Req' inside an embedded Erlang expression is the paramterised module which allows the appropriate adapter to be called.

Thus 'Req:magic()' calls (for example) calls mochiweb_adapter:magic(Req) if we are using the mochiweb adapter.

To play with this

1. install mochiweb, misultin and cowboy
2. edit your .erlang so that the system can find the mochiweb, misultin and cowboy compiled beam files
3. type

   make server1 make server2 make server3 to test

4. Take a look at the (generic) server.erl
5. Take a look at json_round_trip.ehe

Note: this assumes the script openchrome starts a chrome browser
you will have to tweak openchrome to start some other browser