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Posted to commits@activemq.apache.org by ta...@apache.org on 2010/01/07 22:52:44 UTC
svn commit: r897025 -
/activemq/activemq-dotnet/Apache.NMS.Stomp/trunk/src/main/csharp/Util/IdGenerator.cs
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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