separate rule priority in a sub interface

easyrules-core/src/main/java/io/github/benas/easyrules/api/PriorityRule.java

@@ -0,0 +1,52 @@
+/*
+ * The MIT License
+ *
+ *  Copyright (c) 2014, Mahmoud Ben Hassine (md.benhassine@gmail.com)
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in
+ *  all copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *  THE SOFTWARE.
+ */
+
+package io.github.benas.easyrules.api;
+
+import javax.management.MXBean;
+
+/**
+ * Abstraction for a priority rule : rules registered in a PriorityRulesEngine will be fired
+ * according to their natural order.<br/>
+ *
+ * Priority rules are by default manageable via JMX to allow changing their priorities dynamically at runtime.
+ *
+ * @author Mahmoud Ben Hassine (md.benhassine@gmail.com)
+ */
+@MXBean
+public interface PriorityRule extends Rule {
+
+    /**
+     * Getter for rule priority.
+     * @return rule priority
+     */
+    int getPriority();
+
+    /**
+     * Setter for rule priority.
+     * @param priority the priority to set
+     */
+    void setPriority(int priority);
+
+}

easyrules-core/src/main/java/io/github/benas/easyrules/api/Rule.java

@@ -33,6 +33,7 @@ import javax.management.MXBean;
  *
  * @author Mahmoud Ben Hassine (md.benhassine@gmail.com)
  */
+
 @MXBean
 public interface Rule {
 
@@ -48,18 +49,6 @@ public interface Rule {
      */
     String getDescription();
 
-    /**
-     * Getter for rule priority.
-     * @return rule priority
-     */
-    int getPriority();
-
-    /**
-     * Setter for rule priority.
-     * @param priority the priority to set
-     */
-    void setPriority(int priority);
-
     /**
      * Setter for rule description.
      * @param description new rule description