ohvitorino · June 10, 2016 12:04 · Jul 15, 2011
diff --git a/Overview.txt b/Overview.txt
@@ -0,0 +1,43 @@
+Overview: 
+This was an example I have given to my co-developer who was doing some Task/Coodinator type of code. Hope this is helpful to many other developers out there. 
+
+Note that the example only supports one-to-one dependency between TaskObject instance. The TaskAbstract class can be easily modified to support 1-to-many dependency.
+
+For simpicity, I have combined all three classes in this single gist:
+  1. TaskAbstract
+  2. TaskObject        (extends TaskAbstract) 
+  3. TaskCoordinator  (extends TaskAbstract)
+
+The TaskCoordinator class shows an example that resembles the following dependency:
+
+    1. A $queue contains multiple TaskObject instances
+    2. TaskObject."Raul" is dependent on TaskObject."Mark"
+    3. TaskObject."Mark" is dependent on TaskObject."Tim"
+    4. TaskObject."Faustino" is independent.
+
+       ```php
+         $queue[] = new TaskObject("Raul");
+         $queue[] = new TaskObject("Mark");
+         $queue[] = new TaskObject("Tim");
+         $queue[] = new TaskObject("Faustino");
+
+         $queue[0]->setDependency($queue[1]);
+         $queue[1]->setDependency($queue[2]);
+       ```
+
+      [Raul] -> [Mark] -> [Tim]   [Faustino]
+        ^                               ^ 
+        |                               |
+        |                               |
+      [Coordinator]                     |
+                 .............       [Coordinator]                
+
+
+The output is:
+
+   Hello! I'm task: Tim
+   Hello! I'm task: Mark
+   Hello! I'm task: Raul
+   Hello! I'm task: Faustino
+
+
diff --git a/TestTaskCoord.php b/TestTaskCoord.php
@@ -0,0 +1,84 @@
+<?php
+
+abstract class TaskAbstract {
+
+    const STATUS_READY = 1;
+    const STATUS_DONE  = 2;
+
+    protected $dependency;
+    protected $status;
+
+    abstract public function run($caller);
+    public function getStatus() { 
+        return $this->status;
+    }
+
+    public function setDependency(TaskAbstract $task) {
+       $this->dependency = $task;
+    }
+
+}
+
+
+class TaskObject extends TaskAbstract {
+
+    private $taskName = "";
+
+    public function __construct($taskName) {
+        $this->taskName = $taskName;
+        $this->status = self::STATUS_READY;       
+    }
+
+    public function run($caller) {
+	if ($this->status == self::STATUS_DONE) {
+	    return true;
+        }
+
+        if ($this->status != self::STATUS_READY) {
+	    return false;
+        }
+
+        //run dependency if available
+        if (!empty($this->dependency)) {
+            $this->dependency->run($this);
+        }
+
+        echo "Hello! I'm task: {$this->taskName} \n";
+        $this->status = self::STATUS_DONE;
+    }
+
+}
+
+
+class TaskCoordinator  extends TaskAbstract {
+
+     public function run( $caller) {
+
+         $queue = array();
+         $queue[] = new TaskObject("Raul");
+         $queue[] = new TaskObject("Mark");
+         $queue[] = new TaskObject("Tim");
+         $queue[] = new TaskObject("Faustino");
+
+         $queue[0]->setDependency($queue[1]);
+         $queue[1]->setDependency($queue[2]);
+
+/*
+         $queue[0]->run($this);
+         $queue[3]->run($this);
+
+         $queue[3]->run($this);
+*/
+	foreach ($queue as $q) {
+	    $q->run($this);
+        }
+     }
+
+}
+
+
+
+$coordinator = new TaskCoordinator();
+$coordinator->run(null);
+
+?>
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