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Commit d48b3db

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Badacadabra
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Add Mediator (ES5 + ES6 + CoffeeScript + TypeScript)
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‎doc/GoF/Behavioral/Mediator/README.md

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# Synopsis
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Tom and Dick are neighbors. Dick makes a lot of noise on Sunday mornings, which drives Tom crazy. Communication has become difficult between them because of this.
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# Problem
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If Tom and Dick cannot talk to each other directly, Dick will continue to make noise and Tom will get angry every Sunday.
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# Solution
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When communication is difficult between two objects or in a system (here the neighborhood), the solution is delegation to a third-party object. This object will make communication easier between all other objects.
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This is exactly the solution proposed by the Mediator pattern. To implement this pattern, we need:
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* An abstract representation of a neighbor (abstract class should be preferred because it centralizes the reference to the mediator)
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* An abstract representation of a neighborhood mediator (abstract class or interface)
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* Concrete neighbors (Tom and Dick)
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* A concrete mediator (Harry)
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# ==============================
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# ABSTRACT COLLEAGUE
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# ==============================
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class Neighbor
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constructor: (mediator) ->
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throw new Error "You cannot instantiate an abstract class!" if @constructor is Neighbor
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@_mediator = mediator
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send: (message) ->
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throw new Error "You cannot instantiate an abstract class!"
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receive: (message, sender) ->
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throw new Error "You cannot instantiate an abstract class!"
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# ==============================
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# ABSTRACT MEDIATOR
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# ==============================
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class Mediator
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constructor: ->
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throw new Error "You cannot instantiate an abstract class!" if @constructor is Mediator
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send: (message, neighbor) ->
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throw new Error "You cannot instantiate an abstract class!"
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# ==============================
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# CONCRETE COLLEAGUES (NEIGHBORS)
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# ==============================
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class Tom extends Neighbor
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constructor: (mediator) ->
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super mediator
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send: (message) ->
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@_mediator.send(message, @)
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receive: (message, sender) ->
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"[Tom] Message from #{sender}: '#{message}'\n"
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class Dick extends Neighbor
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constructor: (mediator) ->
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super mediator
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send: (message) ->
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return @_mediator.send(message, @)
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receive: (message, sender) ->
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"[Dick] Message from #{sender}: '#{message}'\n"
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# ==============================
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# CONCRETE MEDIATOR
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# ==============================
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class Harry extends Mediator
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constructor: ->
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@_tom = new Tom(@)
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@_dick = new Dick(@)
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send: (message, neighbor) ->
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if neighbor instanceof Tom
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@_dick.receive message, "Tom"
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else if neighbor instanceof Dick
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@_tom.receive message, "Dick"
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else
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throw new Error "Unknown neighbor"
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# ==============================
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# CLIENT CODE
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# ==============================
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harry = new Harry
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tom = new Tom harry
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dick = new Dick harry
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conversation = ""
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conversation += tom.send "Could you lower the volume of your music, please?"
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conversation += dick.send "Are you serious? The volume is actually very low..."
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console.log conversation
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// ==============================
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// ABSTRACT COLLEAGUE
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// ==============================
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abstract class Neighbor {
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protected mediator: Mediator;
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constructor(mediator: Mediator) {
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this.mediator = mediator;
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}
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public abstract send(message: string): string;
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public abstract receive(message: string, sender: string): string;
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}
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// ==============================
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// ABSTRACT MEDIATOR
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// ==============================
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interface Mediator {
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send(message: string, neighbor: Neighbor): string;
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}
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// ==============================
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// CONCRETE COLLEAGUES (NEIGHBORS)
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// ==============================
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class Tom extends Neighbor {
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constructor(mediator: Mediator) {
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super(mediator);
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}
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send(message: string): string {
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return this.mediator.send(message, this);
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}
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receive(message: string, sender: string): string {
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return `[Tom] Message from ${sender}: '${message}'\n`;
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}
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}
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class Dick extends Neighbor {
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constructor(mediator: Mediator) {
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super(mediator);
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}
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send(message: string): string {
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return this.mediator.send(message, this);
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}
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receive(message: string, sender: string): string {
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return `[Dick] Message from ${sender}: '${message}'\n`;
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}
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}
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// ==============================
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// CONCRETE MEDIATOR
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// ==============================
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class Harry implements Mediator {
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private tom: Tom = new Tom(this);
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private dick: Dick = new Dick(this);
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send(message: string, neighbor: Neighbor): string {
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if (neighbor instanceof Tom) {
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return this.dick.receive(message, "Tom");
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} else if (neighbor instanceof Dick) {
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return this.tom.receive(message, "Dick");
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} else {
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throw new Error("Unknown neighbor");
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}
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}
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}
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// ==============================
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// CLIENT CODE
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// ==============================
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let harry: Mediator = new Harry(),
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tom: Neighbor = new Tom(harry),
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dick: Neighbor = new Dick(harry),
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conversation: string = "";
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conversation += tom.send("Could you lower the volume of your music, please?");
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conversation += dick.send("Are you serious? The volume is actually very low...");
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console.log(conversation);
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'use strict';
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// ==============================
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// ABSTRACT COLLEAGUE
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// ==============================
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var Neighbor = (function() {
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function Neighbor(mediator) {
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if (this.constructor === Neighbor) {
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throw new Error("You cannot instantiate an abstract class!");
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}
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this._mediator = mediator;
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}
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Neighbor.prototype.send = function (message) {
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throw new Error("You cannot instantiate an abstract class!");
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};
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Neighbor.prototype.receive = function (message, sender) {
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throw new Error("You cannot instantiate an abstract class!");
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};
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return Neighbor;
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})();
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// ==============================
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// ABSTRACT MEDIATOR
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// ==============================
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var Mediator = (function() {
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function Mediator() {
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if (this.constructor === Mediator) {
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throw new Error("You cannot instantiate an abstract class!");
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}
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}
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Mediator.prototype.send = function (message, neighbor) {
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throw new Error("You cannot instantiate an abstract class!");
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};
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return Mediator;
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})();
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// ==============================
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// CONCRETE COLLEAGUES (NEIGHBORS)
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// ==============================
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var Tom = (function () {
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function Tom(mediator) {
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Neighbor.call(this, mediator);
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}
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Tom.prototype = Object.create(Neighbor.prototype);
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Tom.prototype.constructor = Tom;
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Tom.prototype.send = function (message) {
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return this._mediator.send(message, this);
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};
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Tom.prototype.receive = function (message, sender) {
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return "[Tom] Message from " + sender + ": '" + message + "'\n";
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};
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return Tom;
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})();
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var Dick = (function () {
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function Dick(mediator) {
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Neighbor.call(this, mediator);
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}
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Dick.prototype = Object.create(Neighbor.prototype);
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Dick.prototype.constructor = Dick;
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Dick.prototype.send = function (message) {
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return this._mediator.send(message, this);
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};
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Dick.prototype.receive = function (message, sender) {
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return "[Dick] Message from " + sender + ": '" + message + "'\n";
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};
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return Dick;
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})();
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// ==============================
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// CONCRETE MEDIATOR
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// ==============================
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var Harry = (function () {
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var tom = new Tom(this),
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dick = new Dick(this);
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function Harry() {}
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Harry.prototype = Object.create(Mediator.prototype);
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Harry.prototype.constructor = Harry;
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Harry.prototype.send = function (message, neighbor) {
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if (neighbor instanceof Tom) {
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return dick.receive(message, "Tom");
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} else if (neighbor instanceof Dick) {
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return tom.receive(message, "Dick");
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} else {
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throw new Error("Unknown neighbor");
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}
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};
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return Harry;
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})();
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// ==============================
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// CLIENT CODE
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// ==============================
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var harry = new Harry(),
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tom = new Tom(harry),
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dick = new Dick(harry),
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conversation = "";
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conversation += tom.send("Could you lower the volume of your music, please?");
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conversation += dick.send("Are you serious? The volume is actually very low...");
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console.log(conversation);

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