example: adding a sample to show a simple case of callbacks with FFI

[nit.git] / examples / callback_chimpanze.nit

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+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Copyright 2013 Matthieu Lucas <lucasmatthieu@gmail.com>
+#
+# 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.
+
+# This sample has been implemented to show you how simple is it to play 
+# with native callbacks (C) through an high level with NIT program.
+
+module callback_chimpanze
+import callback_monkey
+
+class Chimpanze
+       super MonkeyActionCallable
+
+       fun create
+       do
+               var monkey = new Monkey
+               print "Hum, I'm sleeping ..."
+               # Invoking method which will take some time to compute, and 
+               # will be back in wokeUp method with information.
+               # - Callback method defined in MonkeyActionCallable Interface
+               monkey.wokeUpAction(self, "Hey, I'm awake.")
+       end
+
+       # Inherit callback method, defined by MonkeyActionCallable interface
+       # - Back of wokeUpAction method 
+       redef fun wokeUp( sender:Monkey, message:Object )
+       do
+               print message
+       end
+end
+
+var m = new Chimpanze
+m.create