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Added mediator pattern
1 parent 0e7b586 commit a163e11

10 files changed

Lines changed: 269 additions & 76 deletions

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‎src/SoftwarePatterns.Core/Mediator/Airbus577.cs‎

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namespace SoftwarePatterns.Core.Mediator
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{
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public class Airbus577 : Aircraft
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{
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public Airbus577(string ident, double initialAltitude, IAircraftController controller)
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: base(ident, initialAltitude, controller)
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{
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}
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protected override string Make
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{
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get { return "Airbus577"; }
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}
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}
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}

‎src/SoftwarePatterns.Core/Mediator/Aircraft.cs‎

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using System;
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namespace SoftwarePatterns.Core.Mediator
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{
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public abstract class Aircraft : IAircraft
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{
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private readonly string _ident;
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private double _altitude;
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protected Aircraft(string ident, double initialAltitude, IAircraftController controller)
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{
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_ident = ident;
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_altitude = initialAltitude;
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Controller = controller;
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controller.RegisterAircraft(this);
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}
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protected abstract string Make { get; }
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public double Altitude
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{
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get { return _altitude; }
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set
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{
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_altitude = value;
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Controller.RecieveAircraftLocation(this);
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}
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}
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public IAircraftController Controller { get; set; }
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public string Identifer
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{
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get
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{
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return _ident;
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}
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}
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public void WarnOfAirspaceIntrusion(IAircraft aircraftIntruding)
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{
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Intrusion = true;
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Console.WriteLine("Aircraft {0} just intruded into airspace of {1}", Identifer, aircraftIntruding.Identifer);
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}
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public bool Intrusion { get; set; }
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public void WarnOfIntrusionIntoAirspace(IAircraft intrudingBy)
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{
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Intrusion = true;
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Console.WriteLine("Aircraft " + Identifer + " just had airspace intruded on by " + intrudingBy.Identifer);
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}
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}
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}

‎src/SoftwarePatterns.Core/Mediator/AircraftController.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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namespace SoftwarePatterns.Core.Mediator
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{
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public class AircraftController : IAircraftController
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{
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private readonly List<IAircraft> _aircraft = new List<IAircraft>();
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public void RegisterAircraft(IAircraft aircraft)
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{
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if (!_aircraft.Contains(aircraft))
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{
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_aircraft.Add(aircraft);
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}
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}
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public void RecieveAircraftLocation(IAircraft reportingAircraft)
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{
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foreach (var aircraft in _aircraft.Where(a => a != reportingAircraft)
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.Where(aircraft => Math.Abs(aircraft.Altitude - reportingAircraft.Altitude) > 100))
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{
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reportingAircraft.WarnOfAirspaceIntrusion(aircraft);
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aircraft.WarnOfIntrusionIntoAirspace(reportingAircraft);
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}
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}
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}
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public interface IAircraftController
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{
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void RegisterAircraft(IAircraft aircraft);
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void RecieveAircraftLocation(IAircraft reportingAircraft);
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}
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}

‎src/SoftwarePatterns.Core/Mediator/Boeing747.cs‎

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namespace SoftwarePatterns.Core.Mediator
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{
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public class Boeing747 : Aircraft
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{
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public Boeing747(string ident, double initialAltitude, IAircraftController controller)
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: base(ident, initialAltitude, controller)
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{
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}
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protected override string Make
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{
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get { return "Boeing747"; }
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}
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}
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}

‎src/SoftwarePatterns.Core/Mediator/IAircraft.cs‎

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namespace SoftwarePatterns.Core.Mediator
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{
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public interface IAircraft
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{
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bool Intrusion { get; set; }
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double Altitude { get; set; }
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IAircraftController Controller { get; set; }
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string Identifer { get; }
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void WarnOfAirspaceIntrusion(IAircraft aircraftIntruding);
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void WarnOfIntrusionIntoAirspace(IAircraft intrudingBy);
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}
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}

‎src/SoftwarePatterns.Core/Mediator/ReadMe.txt‎

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Define:
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The mediator pattern defines an object that encapsulates how a set of objects interact. This pattern is considered to be a behavioural pattern due to the way it can alter the program's running behaviour.
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Usage:
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Components need to communicate with each other
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They communicate via the mediator
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The components all have knowledge of the mediator
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Advantages:
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Hides coordination between components
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Component no longer need to know about each other
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Mediator turns many to many relationships into one to many/many to one.
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Disadvantages:
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The mediator can become large and very complicated

‎src/SoftwarePatterns.Core/SoftwarePatterns.Core.csproj‎

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<Compile Include="LazyLoad\Customer.cs" />
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<Compile Include="LazyLoad\LazyInitialisation\Order.cs" />
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<Compile Include="LazyLoad\Proxy\Order.cs" />
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<Compile Include="Mediator\Airbus577.cs" />
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<Compile Include="Mediator\Aircraft.cs" />
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<Compile Include="Mediator\AircraftController.cs" />
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<Compile Include="Mediator\Boeing747.cs" />
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<Compile Include="Mediator\IAircraft.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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</ItemGroup>
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<ItemGroup>
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<Content Include="Interpreter\ReadMe.txt" />
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<Content Include="Iterator\ReadMe.txt" />
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<Content Include="LazyLoad\ReadMe.txt" />
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<Content Include="Mediator\ReadMe.txt" />
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</ItemGroup>
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<ItemGroup />
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<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />

‎src/SoftwarePatterns.Tests/Mediator/AircraftControllerTests.cs‎

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using SoftwarePatterns.Core.Mediator;
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using Xunit;
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namespace SoftwarePatterns.Tests.Mediator
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{
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public class AircraftControllerTests
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{
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[Fact]
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public void IntrusionStateWhenAtSameAltitude()
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{
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var controller = new AircraftController();
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var aircraft = new Boeing747("1234", 10000, controller);
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var aircraft1 = new Airbus577("4567", 8000, controller);
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aircraft.Altitude += 1000;
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Assert.True(aircraft.Intrusion);
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Assert.True(aircraft1.Intrusion);
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}
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}
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}

‎src/SoftwarePatterns.Tests/SoftwarePatterns.Tests.csproj‎

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<Compile Include="Flyweight\TileFactoryTests.cs" />
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<Compile Include="Iterator\BinaryTreeTests.cs" />
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<Compile Include="LazyLoad\OrderTests.cs" />
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<Compile Include="Mediator\AircraftControllerTests.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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</ItemGroup>
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<ItemGroup>

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