September 2013
Intermediate to advanced
548 pages
12h 25m
English
Content preview from Programming Erlang, 2nd Edition
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The Application Servers
Our application has two servers: a prime number server and an area server.
The Prime Number Server
Here’s the prime number server. It has been written using
the gen_server behavior (see Getting Started with gen_server). Note how it includes the alarm
handling procedures we developed in the previous section.
| prime_server.erl | |
| | -module(prime_server). |
| | |
| | -behaviour(gen_server). |
| | |
| | -export([new_prime/1, start_link/0]). |
| | |
| | %% gen_server callbacks |
| | -export([init/1, handle_call/3, handle_cast/2, handle_info/2, |
| | terminate/2, code_change/3]). |
| | |
| | start_link() -> |
| | gen_server:start_link({local, ?MODULE}, ?MODULE, [], []). |
| | |
| | new_prime(N) -> |
| | %% 20000 is a timeout (ms) |
| | gen_server:call(?MODULE, {prime, N}, 20000). ... |
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