1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2014 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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4 | *
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5 | * This file is part of HeuristicLab.
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6 | *
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7 | * HeuristicLab is free software: you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation, either version 3 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * HeuristicLab is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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19 | */
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20 | #endregion
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21 |
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22 | using HeuristicLab.Common;
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23 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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24 | using System;
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25 | using System.Collections.Generic;
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26 | using System.Drawing;
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27 | using System.Linq;
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28 | using System.Threading;
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29 | using System.Threading.Tasks;
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30 |
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31 | namespace HeuristicLab.Core.Networks {
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32 | [Item("MessagePort", "A port of a network node for sending and receiving messages.")]
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33 | [StorableClass]
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34 | public class MessagePort : ParameterizedPort, IMessagePort {
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35 | public override Image ItemImage {
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36 | get {
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37 | if (PortConnectionValid) return base.ItemImage;
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38 | else return HeuristicLab.Common.Resources.VSImageLibrary.Error;
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39 | }
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40 | }
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41 |
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42 | new public PortParameterCollection Parameters {
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43 | get { return base.Parameters; }
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44 | }
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45 |
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46 | [Storable]
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47 | protected IMessagePort connectedPort;
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48 | public IMessagePort ConnectedPort {
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49 | get { return connectedPort; }
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50 | set {
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51 | if (connectedPort != value) {
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52 | DeregisterConnectedPortEvents();
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53 | connectedPort = value;
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54 | RegisterConnectedPortEvents();
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55 | OnConnectedPortChanged();
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56 | CheckPortConnection();
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57 | }
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58 | }
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59 | }
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60 | IPort IConnectablePort.ConnectedPort {
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61 | get { return ConnectedPort; }
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62 | set {
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63 | if (!(value is IMessagePort))
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64 | throw new InvalidOperationException("Type mismatch. ConnectedPort is not an IMessagePort.");
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65 | ConnectedPort = (IMessagePort)value;
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66 | }
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67 | }
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68 | [Storable]
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69 | protected bool portConnectionValid;
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70 | public bool PortConnectionValid {
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71 | get { return portConnectionValid; }
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72 | protected set {
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73 | if (value != portConnectionValid) {
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74 | portConnectionValid = value;
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75 | OnPortConnectionValidChanged();
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76 | OnItemImageChanged();
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77 | }
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78 | }
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79 | }
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80 | [Storable]
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81 | protected IMessage lastMessage;
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82 | public IMessage LastMessage {
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83 | get { return lastMessage; }
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84 | protected set {
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85 | if (value != lastMessage) {
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86 | lastMessage = value;
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87 | OnLastMessageChanged();
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88 | }
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89 | }
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90 | }
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91 |
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92 | [StorableConstructor]
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93 | protected MessagePort(bool deserializing) : base(deserializing) { }
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94 | protected MessagePort(MessagePort original, Cloner cloner)
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95 | : base(original, cloner) {
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96 | connectedPort = cloner.Clone(original.connectedPort);
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97 | portConnectionValid = original.portConnectionValid;
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98 | lastMessage = null;
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99 | RegisterConnectedPortEvents();
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100 | }
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101 | public MessagePort()
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102 | : base("MessagePort") {
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103 | portConnectionValid = true;
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104 | lastMessage = null;
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105 | }
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106 | public MessagePort(string name)
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107 | : base(name) {
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108 | portConnectionValid = true;
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109 | lastMessage = null;
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110 | }
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111 | public MessagePort(string name, string description)
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112 | : base(name, description) {
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113 | portConnectionValid = true;
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114 | lastMessage = null;
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115 | }
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116 |
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117 | [StorableHook(HookType.AfterDeserialization)]
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118 | private void AfterDeserialization() {
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119 | RegisterConnectedPortEvents();
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120 | }
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121 |
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122 | public override IDeepCloneable Clone(Cloner cloner) {
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123 | return new MessagePort(this, cloner);
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124 | }
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125 |
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126 | public bool CanConnectToPort(IPort port) {
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127 | return (port == null) || (port is IMessagePort);
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128 | }
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129 |
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130 | public IMessage PrepareMessage() {
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131 | if (!PortConnectionValid) throw new InvalidOperationException("Port connection is not valid");
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132 | var message = new Message();
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133 |
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134 | // collect output parameters from local port
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135 | message.Values.AddRange(
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136 | Parameters
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137 | .Where(p => p.Type.HasFlag(PortParameterType.Output))
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138 | .Select(p => p.CreateMessageValue())
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139 | );
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140 |
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141 | // collect remaining parameters from connected port
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142 | if (ConnectedPort != null) {
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143 | message.Values.AddRange(
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144 | ConnectedPort.Parameters
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145 | .Where(p => !message.Values.ContainsKey(p.Name))
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146 | .Select(p => p.CreateMessageValue())
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147 | );
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148 | }
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149 |
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150 | // collect remaining input parameters from local port
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151 | message.Values.AddRange(
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152 | Parameters
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153 | .Where(p => p.Type.HasFlag(PortParameterType.Input) && !message.Values.ContainsKey(p.Name))
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154 | .Select(p => p.CreateMessageValue())
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155 | );
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156 |
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157 | return message;
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158 | }
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159 | public void SendMessage(IMessage message) {
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160 | SendMessage(message, CancellationToken.None);
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161 | }
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162 | public void SendMessage(IMessage message, CancellationToken token) {
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163 | if (!PortConnectionValid) throw new InvalidOperationException("Port connection is not valid");
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164 | if (ConnectedPort != null) ConnectedPort.ReceiveMessage(message, token);
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165 | LastMessage = message;
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166 | OnMessageSent(message, token);
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167 | }
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168 | public async Task SendMessageAsync(IMessage message) {
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169 | await SendMessageAsync(message, CancellationToken.None);
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170 | }
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171 | public async Task SendMessageAsync(IMessage message, CancellationToken token) {
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172 | await Task.Run(() => { SendMessage(message, token); }, token);
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173 | }
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174 | public event EventHandler<EventArgs<IMessage, CancellationToken>> MessageSent;
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175 | protected virtual void OnMessageSent(IMessage message, CancellationToken token) {
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176 | var handler = MessageSent;
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177 | if (handler != null) handler(this, new EventArgs<IMessage, CancellationToken>(message, token));
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178 | }
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179 |
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180 | public void ReceiveMessage(IMessage message, CancellationToken token) {
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181 | if (!PortConnectionValid) throw new InvalidOperationException("Port connection is not valid");
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182 | LastMessage = message;
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183 | OnMessageReceived(message, token);
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184 | token.ThrowIfCancellationRequested();
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185 | }
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186 | public event EventHandler<EventArgs<IMessage, CancellationToken>> MessageReceived;
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187 | protected virtual void OnMessageReceived(IMessage message, CancellationToken token) {
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188 | var handler = MessageReceived;
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189 | if (handler != null) handler(this, new EventArgs<IMessage, CancellationToken>(message, token));
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190 | }
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191 |
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192 | public event EventHandler ConnectedPortChanged;
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193 | protected virtual void OnConnectedPortChanged() {
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194 | var handler = ConnectedPortChanged;
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195 | if (handler != null) handler(this, EventArgs.Empty);
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196 | }
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197 | public event EventHandler PortConnectionValidChanged;
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198 | protected virtual void OnPortConnectionValidChanged() {
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199 | var handler = PortConnectionValidChanged;
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200 | if (handler != null) handler(this, EventArgs.Empty);
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201 | }
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202 | public event EventHandler LastMessageChanged;
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203 | protected virtual void OnLastMessageChanged() {
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204 | var handler = LastMessageChanged;
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205 | if (handler != null) handler(this, EventArgs.Empty);
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206 | }
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207 |
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208 | protected override void OnInterfaceChanged() {
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209 | CheckPortConnection();
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210 | base.OnInterfaceChanged();
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211 | }
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212 |
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213 | #region ConnectedPort Events
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214 | protected virtual void RegisterConnectedPortEvents() {
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215 | if (connectedPort != null) {
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216 | connectedPort.InterfaceChanged += ConnectedPort_InterfaceChanged;
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217 | connectedPort.MessageSent += ConnectedPort_MessageSent;
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218 | }
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219 | }
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220 | protected virtual void DeregisterConnectedPortEvents() {
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221 | if (connectedPort != null) {
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222 | connectedPort.InterfaceChanged -= ConnectedPort_InterfaceChanged;
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223 | connectedPort.MessageSent -= ConnectedPort_MessageSent;
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224 | }
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225 | }
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226 | protected virtual void ConnectedPort_InterfaceChanged(object sender, EventArgs e) {
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227 | CheckPortConnection();
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228 | }
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229 | protected virtual void ConnectedPort_MessageSent(object sender, EventArgs<IMessage, CancellationToken> e) {
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230 | ReceiveMessage(e.Value, e.Value2);
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231 | }
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232 | #endregion
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233 |
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234 | #region Helpers
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235 | protected virtual void CheckPortConnection() {
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236 | PortConnectionValid = (ConnectedPort == null) ||
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237 | (ParametersCompatibleToTarget(Parameters, ConnectedPort.Parameters) &&
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238 | ParametersCompatibleToTarget(ConnectedPort.Parameters, Parameters));
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239 | }
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240 | protected virtual bool ParametersCompatibleToTarget(IEnumerable<IPortParameter> source, IEnumerable<IPortParameter> target) {
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241 | // checks if the source parameters are compatible to the input parameters of the target
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242 | foreach (var input in target.Where(p => p.Type.HasFlag(PortParameterType.Input))) {
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243 | var param = source.Where(p => input.Name == p.Name).FirstOrDefault();
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244 | if (param == null) {
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245 | if (input.DefaultValue == null) return false;
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246 | } else {
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247 | if (!param.Type.HasFlag(PortParameterType.Output)) return false;
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248 | if (!input.DataType.IsAssignableFrom(param.DataType)) return false;
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249 | }
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250 | }
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251 | return true;
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252 | }
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253 | #endregion
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254 | }
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255 | }
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