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Echantillon C #
Blackboard.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
namespace Blackboard
{
public class BlackBoard
{
public List<KnowledgeWorker> knowledgeWorkers;
protected Dictionary<string, ControlData> data;
public Control control;
public BlackBoard()
{
this.knowledgeWorkers = new List<KnowledgeWorker>();
this.control = new Control(this);
this.data = new Dictionary<string, ControlData>();
}
public void addKnowledgeWorker(KnowledgeWorker newKnowledgeWorker)
{
newKnowledgeWorker.blackboard = this;
this.knowledgeWorkers.Add(newKnowledgeWorker);
}
public Dictionary<string, ControlData> inspect()
{
return (Dictionary<string, ControlData>) this.data.ToDictionary(k => k.Key, k => (ControlData) k.Value.Clone());
}
public void update(KeyValuePair<string, ControlData> blackboardEntry)
{
if (this.data.ContainsKey(blackboardEntry.Key))
{
this.data[blackboardEntry.Key] = blackboardEntry.Value;
}
else
throw new InvalidOperationException(blackboardEntry.Key + " Not Found!");
}
public void update(string key, ControlData data)
{
if (this.data.ContainsKey(key))
{
this.data[key] = data;
}
else
{
this.data.Add(key, data);
}
}
public void print()
{
System.Console.WriteLine("Blackboard state");
foreach (KeyValuePair<string, ControlData> cdata in this.data)
{
Console.WriteLine(string.Format("data:{0}", cdata.Key));
Console.WriteLine(string.Format("\tProblem:{0}", cdata.Value.problem));
if(cdata.Value.input!=null)
Console.WriteLine(string.Format("\tInput:{0}", string.Join(",",cdata.Value.input)));
if(cdata.Value.output!=null)
Console.WriteLine(string.Format("\tOutput:{0}", string.Join(",",cdata.Value.output)));
}
}
}
}
Control.cs
using System;
using System.Collections.Generic;
namespace Blackboard
{
public class Control
{
BlackBoard blackBoard = null;
public Control(BlackBoard blackBoard)
{
this.blackBoard = blackBoard;
}
public void loop()
{
System.Console.WriteLine("Starting loop");
if (blackBoard == null)
throw new InvalidOperationException("blackboard is null");
this.nextSource();
System.Console.WriteLine("Loop ended");
}
/// <summary>
/// Selects the next source of knowledge (knowledgeworker by inspecting the blackgoard)
/// </summary>
void nextSource()
{
// observers the blackboard
foreach (KeyValuePair<string, ControlData> value in this.blackBoard.inspect())
{
if (value.Value.problem == "PrimeNumbers")
{
foreach (KnowledgeWorker worker in this.blackBoard.knowledgeWorkers)
{
if (worker.getName() == "PrimeFinder")
{
Console.WriteLine("Knowledge Worker Found");
worker.executeCondition();
worker.executeAction();
worker.updateBlackboard();
}
}
}
}
}
}
}
ControlData.cs
using System;
using System.Collections.Generic;
namespace Blackboard
{
public class ControlData:ICloneable
{
public string problem;
public object[] input;
public object[] output;
public string updateby;
public DateTime updated;
public ControlData()
{
this.problem = null;
this.input = this.output = null;
}
public ControlData(string problem, object[] input)
{
this.problem = problem;
this.input = input;
this.updated = DateTime.Now;
}
public object getResult()
{
return this.output;
}
public object Clone()
{
ControlData clone;
clone = new ControlData(this.problem, this.input);
clone.updated = this.updated;
clone.updateby = this.updateby;
clone.output = this.output;
return clone;
}
}
}
KnowledgeWorker.cs
using System; using System.Collections.Generic;
namespace Blackboard {
/// <summary>
/// each knowledgeworker is resposible for knowing the conditions under which it can contribute to a solution.
/// </summary>
abstract public class KnowledgeWorker
{
protected Boolean canContribute;
protected string Name;
public BlackBoard blackboard = null;
protected List<KeyValuePair<string, ControlData>> keys;
public KnowledgeWorker(BlackBoard blackboard, String Name)
{
this.blackboard = blackboard;
this.Name = Name;
}
public KnowledgeWorker(String Name)
{
this.Name = Name;
}
public string getName()
{
return this.Name;
}
abstract public void executeAction();
abstract public void executeCondition();
abstract public void updateBlackboard();
} }
Modified text is an extract of the original Stack Overflow Documentation
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