Mercurial > silverbladetech

annotate Chronosv2/source/SingleInstance.cs @ 13:87905693f506

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SCC: TFS to HG
author stevenh7776 stevenhollidge@hotmail.com
date Tue, 21 Feb 2012 17:49:06 +0700
parents 443821e55f06
children 741981715d94
rev   line source
10
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1 namespace Chronos
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2 {
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3 using System;
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4 using System.Collections.Generic;
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5 using System.Diagnostics.CodeAnalysis;
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6 using System.Runtime.Remoting;
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7 using System.Runtime.Remoting.Channels;
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8 using System.Runtime.Remoting.Channels.Ipc;
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9 using System.Runtime.Serialization.Formatters;
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10 using System.Threading;
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11 using System.Windows;
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12
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13 /// <summary>
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14 /// http://www.fishbowlclient.com/
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15 /// </summary>
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16 public static class SingleInstance
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17 {
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18 #region · Consts ·
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19
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20 private const string RemoteServiceName = "SingleInstanceApplicationService";
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21
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22 #endregion
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23
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24 #region · Inner Types ·
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25
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26 private class IpcRemoteService : MarshalByRefObject
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27 {
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28 #region · Methods ·
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29
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30 /// <summary>Activate the first instance of the application.</summary>
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31 /// <param name="args">Command line arguemnts to proxy.</param>
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32 public void InvokeFirstInstance(IList<string> args)
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33 {
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34 if (Application.Current != null && !Application.Current.Dispatcher.HasShutdownStarted)
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35 {
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36 Application.Current.Dispatcher.BeginInvoke((Action<object>)((arg) => SingleInstance.ActivateFirstInstance((IList<string>)arg)), args);
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37 }
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38 }
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39
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40 /// <summary>Overrides the default lease lifetime of 5 minutes so that it never expires.</summary>
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41 public override object InitializeLifetimeService()
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42 {
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43 return null;
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44 }
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45
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46 #endregion
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47 }
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48
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49 #endregion
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50
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51 #region · Events ·
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52
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53 public static event EventHandler<SingleInstanceEventArgs> SingleInstanceActivated;
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54
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55 #endregion
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56
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57 #region · Fields ·
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58
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59 private static Mutex SingleInstanceMutex;
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60 private static IpcServerChannel Channel;
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61
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62 #endregion
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63
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64 #region · Methods ·
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65
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66 [SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
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67 public static void SafeDispose<T>(ref T disposable) where T : IDisposable
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68 {
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69 // Dispose can safely be called on an object multiple times.
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70 IDisposable t = disposable;
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71 disposable = default(T);
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72
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73 if (null != t)
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74 {
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75 t.Dispose();
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76 }
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77 }
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78
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79 public static bool InitializeAsFirstInstance(string applicationName)
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80 {
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81 IList<string> commandLineArgs = Environment.GetCommandLineArgs() ?? new string[0];
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82
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83 // Build a repeatable machine unique name for the channel.
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84 string appId = applicationName + Environment.UserName;
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85 string channelName = String.Format("{0}:SingleInstanceIPCChannel", appId);
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86
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87 bool isFirstInstance;
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88
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89 SingleInstanceMutex = new Mutex(true, appId, out isFirstInstance);
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90
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91 if (isFirstInstance)
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92 {
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93 CreateRemoteService(channelName);
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94 }
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95 else
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96 {
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97 SignalFirstInstance(channelName, commandLineArgs);
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98 }
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99
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100 return isFirstInstance;
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101 }
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102
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103 public static void Cleanup()
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104 {
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105 SafeDispose(ref SingleInstanceMutex);
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106
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107 if (Channel != null)
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108 {
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109 ChannelServices.UnregisterChannel(Channel);
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110 Channel = null;
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111 }
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112 }
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113
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114 #endregion
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115
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116 #region · Private Methods ·
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117
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118 private static void CreateRemoteService(string channelName)
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119 {
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120 Channel = new IpcServerChannel(
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121 new Dictionary<string, string>
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122 {
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123 { "name", channelName },
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124 { "portName", channelName },
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125 { "exclusiveAddressUse", "false" },
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126 },
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127 new BinaryServerFormatterSinkProvider { TypeFilterLevel = TypeFilterLevel.Full });
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128
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129 ChannelServices.RegisterChannel(Channel, true);
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130 RemotingServices.Marshal(new IpcRemoteService(), RemoteServiceName);
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131 }
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132
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133 private static void SignalFirstInstance(string channelName, IList<string> args)
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134 {
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135 var secondInstanceChannel = new IpcClientChannel();
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136 ChannelServices.RegisterChannel(secondInstanceChannel, true);
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137
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138 string remotingServiceUrl = String.Format("ipc://{0}/{1}", channelName, RemoteServiceName);
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139
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140 // Obtain a reference to the remoting service exposed by the first instance of the application
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141 var firstInstanceRemoteServiceReference = (IpcRemoteService)RemotingServices.Connect(typeof(IpcRemoteService), remotingServiceUrl);
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142
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143 // Pass along the current arguments to the first instance if it's up and accepting requests.
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144 if (firstInstanceRemoteServiceReference != null)
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145 {
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146 firstInstanceRemoteServiceReference.InvokeFirstInstance(args);
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147 }
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148 }
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149
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150 private static void ActivateFirstInstance(IList<string> args)
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151 {
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152 if (Application.Current != null && !Application.Current.Dispatcher.HasShutdownStarted)
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153 {
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154 var handler = SingleInstanceActivated;
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155
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156 if (handler != null)
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157 {
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158 handler(Application.Current, new SingleInstanceEventArgs { Args = args });
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159 }
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160 }
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161 }
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162
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163 #endregion
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164 }
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165 }