Add method to get a special jobhandler from jobcollection (#8)

* add optional parameter to function event
add job result to after execute event

* pecl install gearman failure

* pecl install gearman failure

* pecl install gearman failure

* GearmanJob->sendComplete() - Object error

* Get special job from JobCollection

Author: digitalcharacter

src/JobCollection.php

@@ -43,13 +43,29 @@ public function addMultipleJobs(array $jobs)
     }
 
     /**
-     * @return array of JobHandler
+     * @return JobHandlerInterface[]
      */
     public function getJobs()
     {
         return $this->jobs;
     }
 
+    /**
+     * @param $jobName
+     * @return JobHandlerInterface|null
+     */
+    public function getJob($jobName)
+    {
+        /** @var JobHandlerInterface $job  */
+        foreach ($this->getJobs() as $job) {
+            if ($job->listensToJob() === $jobName) {
+                return $job;
+            }
+        }
+
+        return null;
+    }
+
     /**
      * @return int
      */