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From tab...@apache.org
Subject svn commit: r897025 - /activemq/activemq-dotnet/Apache.NMS.Stomp/trunk/src/main/csharp/Util/IdGenerator.cs
Date Thu, 07 Jan 2010 21:52:44 GMT
Author: tabish
Date: Thu Jan  7 21:52:43 2010
New Revision: 897025

URL: http://svn.apache.org/viewvc?rev=897025&view=rev
Log:
Add an IdGenerator class to the Stomp client to generate ActiveMQ like unique Ids

Added:
    activemq/activemq-dotnet/Apache.NMS.Stomp/trunk/src/main/csharp/Util/IdGenerator.cs  
(with props)

Added: activemq/activemq-dotnet/Apache.NMS.Stomp/trunk/src/main/csharp/Util/IdGenerator.cs
URL: http://svn.apache.org/viewvc/activemq/activemq-dotnet/Apache.NMS.Stomp/trunk/src/main/csharp/Util/IdGenerator.cs?rev=897025&view=auto
==============================================================================
--- activemq/activemq-dotnet/Apache.NMS.Stomp/trunk/src/main/csharp/Util/IdGenerator.cs (added)
+++ activemq/activemq-dotnet/Apache.NMS.Stomp/trunk/src/main/csharp/Util/IdGenerator.cs Thu
Jan  7 21:52:43 2010
@@ -0,0 +1,193 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+using System;
+using System.Net;
+using System.Net.Sockets;
+using System.Threading;
+
+namespace Apache.NMS.Stomp.Util
+{
+    public class IdGenerator
+    {
+        private static String UNIQUE_STUB;
+        private static int instanceCount;
+        private static String hostName;
+        private String seed;
+        private long sequence;
+
+        static IdGenerator()
+        {
+            String stub = "-1-" + DateTime.Now.Ticks;
+            hostName = "localhost";
+
+            try
+            {
+                hostName = Dns.GetHostName();
+                IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, 0);
+                Socket tempSocket = new Socket(endPoint.AddressFamily, SocketType.Stream,
ProtocolType.Tcp);
+                tempSocket.Bind(endPoint);
+                stub = "-" + ((IPEndPoint)tempSocket.LocalEndPoint).Port + "-" + DateTime.Now.Ticks
+ "-";
+                Thread.Sleep(100);
+                tempSocket.Close();
+            }
+            catch(Exception ioe)
+            {
+                Tracer.Warn("could not generate unique stub: " + ioe.Message);
+            }
+
+            UNIQUE_STUB = stub;
+        }
+
+        /**
+         * Construct an IdGenerator
+         */
+        public IdGenerator(String prefix)
+        {
+            lock(UNIQUE_STUB)
+            {
+                this.seed = prefix + UNIQUE_STUB + (instanceCount++) + ":";
+            }
+        }
+
+        public IdGenerator() : this("ID:" + hostName)
+        {
+        }
+
+        /// <summary>
+        /// As we have to find the hostname as a side-affect of generating a unique
+        /// stub, we allow it's easy retrevial here
+        /// </summary>
+        public static String HostName
+        {
+            get { return hostName; }
+        }
+
+        /// <summary>
+        /// Generate a Unique Id
+        /// </summary>
+        /// <returns>
+        /// A <see cref="String"/>
+        /// </returns>
+        public String GenerateId()
+        {
+            lock(UNIQUE_STUB)
+            {
+                return this.seed + (this.sequence++);
+            }
+        }
+
+        /// <summary>
+        /// Generate a unique ID - that is friendly for a URL or file system
+        /// </summary>
+        /// <returns>
+        /// A <see cref="String"/>
+        /// </returns>
+        public String GenerateSanitizedId()
+        {
+            String result = GenerateId();
+            result = result.Replace(':', '-');
+            result = result.Replace('_', '-');
+            result = result.Replace('.', '-');
+            return result;
+        }
+
+        /// <summary>
+        /// From a generated id - return the seed (i.e. minus the count)
+        /// </summary>
+        /// <param name="id">
+        /// A <see cref="String"/>
+        /// </param>
+        /// <returns>
+        /// A <see cref="String"/>
+        /// </returns>
+        public static String GetSeedFromId(String id)
+        {
+            String result = id;
+
+            if(id != null)
+            {
+                int index = id.LastIndexOf(':');
+                if(index > 0 && (index + 1) < id.Length)
+                {
+                    result = id.Substring(0, index + 1);
+                }
+            }
+
+            return result;
+        }
+
+        /// <summary>
+        /// From a generated id - return the generator count
+        /// </summary>
+        /// <param name="id">
+        /// A <see cref="String"/>
+        /// </param>
+        /// <returns>
+        /// A <see cref="System.Int64"/>
+        /// </returns>
+        public static long GetSequenceFromId(String id)
+        {
+            long result = -1;
+            if(id != null)
+            {
+                int index = id.LastIndexOf(':');
+
+                if(index > 0 && (index + 1) < id.Length)
+                {
+                    String numStr = id.Substring(index + 1, id.Length);
+                    result = Int64.Parse(numStr);
+                }
+            }
+            return result;
+        }
+
+        /// <summary>
+        /// Does a proper compare on the ids
+        /// </summary>
+        /// <param name="id1">
+        /// A <see cref="String"/>
+        /// </param>
+        /// <param name="id2">
+        /// A <see cref="String"/>
+        /// </param>
+        /// <returns>
+        /// A <see cref="System.Int32"/>
+        /// </returns>
+        public static int Compare(String id1, String id2)
+        {
+            int result = -1;
+
+            String seed1 = IdGenerator.GetSeedFromId(id1);
+            String seed2 = IdGenerator.GetSeedFromId(id2);
+
+            if(seed1 != null && seed2 != null)
+            {
+                result = seed1.CompareTo(seed2);
+
+                if(result == 0)
+                {
+                    long count1 = IdGenerator.GetSequenceFromId(id1);
+                    long count2 = IdGenerator.GetSequenceFromId(id2);
+                    result = (int)(count1 - count2);
+                }
+            }
+
+            return result;
+        }
+    }
+}

Propchange: activemq/activemq-dotnet/Apache.NMS.Stomp/trunk/src/main/csharp/Util/IdGenerator.cs
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    svn:eol-style = native



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