java: added callback functionality

Signed-off-by: Stefan Andritoiu <stefan.andritoiu@intel.com>
Signed-off-by: Andrei Vasiliu <andrei.vasiliu@intel.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

src/IsrCallback.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#ifdef SWIGJAVA
+class IsrCallback
+{
+  public:
+    virtual ~IsrCallback()
+    {
+    }
+    virtual void run()
+    { /* empty, overloaded in Java*/
+    }
+
+  private:
+};
+
+
+static void generic_callback_isr (void* data)
+{
+    IsrCallback* callback = (IsrCallback*) data;
+    callback->run();
+}
+#endif