draws arrow head to signal binding direction
draws arrow head to signal binding direction

adrianzhang/RabbitMQSimulator,RabbitMQSimulator/RabbitMQSimulator,RabbitMQSimulator/RabbitMQSimulator,adrianzhang/RabbitMQSimulator,Stackato-Apps/RabbitMQSimulator,Stackato-Apps/RabbitMQSimulator