From 42ad6ee6c9a5d0ab6a855e63ef3b8a199c9cf68e Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?=
 <bombe@pterodactylus.net>
Date: Wed, 2 Jan 2013 02:37:39 +0100
Subject: [PATCH] Add action interface.

---
 .../java/net/pterodactylus/reactor/Action.java     | 40 ++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 src/main/java/net/pterodactylus/reactor/Action.java

diff --git a/src/main/java/net/pterodactylus/reactor/Action.java b/src/main/java/net/pterodactylus/reactor/Action.java
new file mode 100644
index 0000000..9d743b2
--- /dev/null
+++ b/src/main/java/net/pterodactylus/reactor/Action.java
@@ -0,0 +1,40 @@
+/*
+ * Reactor - Action.java - Copyright © 2013 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.reactor;
+
+/**
+ * An action is performed when a {@link Trigger} determines that two given
+ * {@link State}s of a {@link Query} signify a change.
+ *
+ * @param <S>
+ *            The type of the state
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public interface Action<S extends State> {
+
+	/**
+	 * Performs the action.
+	 *
+	 * @param currentState
+	 *            The current state of a system
+	 * @param previousState
+	 *            The previous state of the system
+	 */
+	void execute(S currentState, S previousState);
+
+}
-- 
2.7.4