public function getMessages ($channelId, $limit = 20, $since = null, $before = null)
	{
		$profiler = Neuron_Profiler_Profiler::getInstance ();

		if (isset ($since))
		{
			// Here we do some magic to check if the last id has changed
			$cName = $this->sPrefix . 'lastmessage_' . $channelId;

			$profiler->message ('Checking ' . $cName . ' against ' . $since);

			if (
				$this->objCache->hasCache ($cName)
				&& $this->objCache->getCache ($cName) <= $since
			) {
				$profiler->message ('Not checking for new messages');
				return array ();
			}
		}

		$profiler->message ('Checking for new messages');
		return parent::getMessages ($channelId, $limit, $since, $before);
	}
public function getMessages ($channelId, $limit = 20, $since = null, $before = null)
	{
		$profiler = Neuron_Profiler_Profiler::getInstance ();

		if (isset ($since))
		{
			// Here we do some magic to check if the last id has changed
			$cName = $this->sPrefix . 'lastmessage_' . $channelId;

			$profiler->message ('Checking ' . $cName . ' against ' . $since);

			if (
				$this->objCache->hasCache ($cName)
				&& $this->objCache->getCache ($cName) <= $since
			) {
				$profiler->message ('Not checking for new messages');
				return array ();
			}
		}

		$profiler->message ('Checking for new messages');
		return parent::getMessages ($channelId, $limit, $since, $before);
	}
Return the latest messages since $since.
$since should be the last received message ID.