lib/libevent/libevent_example.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #     http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14
  15 # Minimal usage example of libevent
  16 module libevent_example is example
  17
  18 import libevent
  19
  20 # Factory creating instances of `EchoConnection` to handle new connections
  21 class MyFactory
  22         super ConnectionFactory
  23
  24         redef fun spawn_connection(buf, address)
  25         do
  26                 return new EchoConnection(buf)
  27         end
  28 end
  29
  30 # Connection echoing data received from clients back at them
  31 class EchoConnection
  32         super Connection
  33
  34         redef fun read_callback(content)
  35         do
  36                 print "Received: {content}"
  37                 write content
  38         end
  39 end
  40
  41 # Skip the actual execution when testing
  42 if "NIT_TESTING".environ == "true" then exit 0
  43
  44 # Setup libevent system
  45 var event_base = new NativeEventBase
  46 var factory = new MyFactory(event_base)
  47
  48 # Open a TCP socket for listening
  49 factory.bind_tcp("localhost", 8888)
  50
  51 # Open a UNIX domain socket for listening
  52 factory.bind_unix("/tmp/my.sck")
  53
  54 # Launch event loop
  55 event_base.dispatch
  56
  57 event_base.free