Merged HEAD-BUG-FIX (5.1/Cloud) to HEAD (5.1/Cloud)

108207: Merged 5.0.N (5.0.3) to HEAD-BUG-FIX (5.1/Cloud)
      108196: Merged DEV to 5.0.N (5.0.3)
         108195: MNT-13706 : Admin console unusable after we set any  busy port in Port Number Value for subsystem
            - New and improved fix.


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@108223 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/util/PortUtil.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2005-2015 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.util;
+
+import java.io.IOException;
+import java.net.ServerSocket;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+/**
+ * Alfresco port-related utility functions.
+ * 
+ * @author abalmus
+ */
+public class PortUtil
+{
+    private static Log logger = LogFactory.getLog(PortUtil.class);
+    
+    /**
+     * Check if specified port is free.
+     * @param port Port number to check.
+     * @return true if port is free or false if it's already in use.
+     */
+    public static boolean isPortFree(int port)
+    {
+        boolean isFree = true;
+        ServerSocket serverSocket = null;
+        
+        try
+        {
+           serverSocket = new ServerSocket(port);
+        }
+        catch (IOException ioe)
+        {
+            isFree = false;
+        }
+        finally
+        {
+            if (serverSocket != null)
+            {
+                try
+                {
+                    serverSocket.close();
+                }
+                catch (IOException ioe)
+                {
+                    if (logger.isDebugEnabled())
+                    {
+                        logger.debug(ioe.toString());
+                    }
+                }
+            }
+        }
+        
+        return isFree;
+    }
+}