libevent: intro minimal usage example

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/libevent/libevent_example.nit b/lib/libevent/libevent_example.nit
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+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Minimal usage example of libevent
+module libevent_example is example
+
+import libevent
+
+# Factory creating instances of `EchoConnection` to handle new connections
+class MyFactory
+       super ConnectionFactory
+
+       redef fun spawn_connection(buf, address)
+       do
+               return new EchoConnection(buf)
+       end
+end
+
+# Connection echoing data received from clients back at them
+class EchoConnection
+       super Connection
+
+       redef fun read_callback(content)
+       do
+               print "Received: {content}"
+               write content
+       end
+end
+
+# Skip the actual execution when testing
+if "NIT_TESTING".environ == "true" then exit 0
+
+# Setup libevent system
+var event_base = new NativeEventBase
+var factory = new MyFactory(event_base)
+
+# Open a TCP socket for listening
+factory.bind_tcp("localhost", 8888)
+
+# Open a UNIX domain socket for listening
+factory.bind_unix("/tmp/my.sck")
+
+# Launch event loop
+event_base.dispatch
+
+event_base.free