Merge DEV to HEAD

ContentDiskDriver rework.

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@29451 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/filesys/repo/rules/ScenarioInstance.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2005-2010 Alfresco Software Limited.
+ *
+ * This file is part of Alfresco
+ *
+ * Alfresco is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Alfresco 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.alfresco.filesys.repo.rules;
+
+/**
+ * A scenario instance is an active scenario.   It has a ranking, an 
+ * evaluate method and knows whether it is complete.
+ * <p>
+ * The evaluate method is called repeatedly as operations are processed. 
+ */
+public interface ScenarioInstance
+{
+    enum Ranking
+    {
+        LOW,   // Bottom priority
+        MEDIUM, 
+        HIGH,
+        
+    };
+    
+    /**
+     * Get the Ranking
+     * @return
+     */
+    public Ranking getRanking();
+    
+    /**
+     * evaluate the scenario against the current operation
+     * 
+     * @param operation
+     */
+    public Command evaluate(Operation operation);
+    
+    /**
+     * Is the scenario complete?
+     *
+     * @return
+     */
+    public boolean isComplete();     
+    
+    
+}