GearmanClient class extended to prevent duplicate jobs

GearmanClient.php

<?php

class GearmanClient extends \GearmanClient
{
	const PRIORITY_LOW    = 'low';
	const PRIORITY_HIGH   = 'high';
	const PRIORITY_NORMAL = 'normal';

	public function getUniqueId($function_name, $workload, $priority = null)
	{
		return sha1($function_name.$workload.$priority);
	}

	public function getMethodName($runBackground, $priority)
	{
		$method = 'do';
		if ($priority !== self::PRIORITY_NORMAL || !$runBackground) {
			$method .= ucfirst($priority);
		}
		if ($runBackground) {
			$method .= 'Background';
		}
		return $method;
	}

	public function doSpecific($function_name, $workload, $runBackground, $priority = self::PRIORITY_NORMAL, $unique = null)
	{
		$method = $this->getMethodName($runBackground, $priority);
		return $this->$method($function_name, $workload, $unique);
	}

	public function doNormal($function_name, $workload, $unique = null)
	{
		$unique = $this->getUniqueId($function_name, $workload, self::PRIORITY_NORMAL);
		return parent::doNormal($function_name, $workload, $unique);
	}

	public function doHigh($function_name, $workload, $unique = null)
	{
		$unique = $this->getUniqueId($function_name, $workload, self::PRIORITY_HIGH);
		return parent::doHigh($function_name, $workload, $unique);
	}

	public function doLow($function_name, $workload, $unique = null)
	{
		$unique = $this->getUniqueId($function_name, $workload, self::PRIORITY_LOW);
		return parent::doLow($function_name, $workload, $unique);
	}

	public function doBackground($function_name, $workload, $unique = null)
	{
		$unique = $this->getUniqueId($function_name, $workload, self::PRIORITY_NORMAL);
		return parent::doBackground($function_name, $workload, $unique);
	}

	public function doHighBackground($function_name, $workload, $unique = null)
	{
		$unique = $this->getUniqueId($function_name, $workload, self::PRIORITY_HIGH);
		return parent::doHighBackground($function_name, $workload, $unique);
	}

	public function doLowBackground($function_name, $workload, $unique = null)
	{
		$unique = $this->getUniqueId($function_name, $workload, self::PRIORITY_LOW);
		return parent::doLowBackground($function_name, $workload, $unique);
	}

	public function addTask($function_name, $workload, $context = null, $unique = null)
	{
		$unique = $this->getUniqueId($function_name, $workload, self::PRIORITY_NORMAL);
		return parent::addTask($function_name, $workload, $context, $unique);
	}

	public function addTaskHigh($function_name, $workload, $context = null, $unique = null)
	{
		$unique = $this->getUniqueId($function_name, $workload, self::PRIORITY_HIGH);
		return parent::addTaskHigh($function_name, $workload, $context, $unique);
	}

	public function addTaskLow($function_name, $workload, $context = null, $unique = null)
	{
		$unique = $this->getUniqueId($function_name, $workload, self::PRIORITY_LOW);
		return parent::addTaskLow($function_name, $workload, $context, $unique);
	}

	public function addTaskBackground($function_name, $workload, $context = null, $unique = null)
	{
		$unique = $this->getUniqueId($function_name, $workload, self::PRIORITY_NORMAL);
		return parent::addTaskBackground($function_name, $workload, $context, $unique);
	}

	public function addTaskHighBackground($function_name, $workload, $context = null, $unique = null)
	{
		$unique = $this->getUniqueId($function_name, $workload, self::PRIORITY_HIGH);
		return parent::addTaskHighBackground($function_name, $workload, $context, $unique);
	}

	public function addTaskLowBackground($function_name, $workload, $context = null, $unique = null)
	{
		$unique = $this->getUniqueId($function_name, $workload, self::PRIORITY_LOW);
		return parent::addTaskLowBackground($function_name, $workload, $context, $unique);
	}
}