Events
JIRA is an event driven system. This means that usually when an action occurs (for example, when an issue is created), JIRA fires off a corresponding event. This event is then picked up by components that are designed to listen to the event. Not surprisingly, they are called listeners. When a listener picks up an event, it will perform its duty such as keeping issues up to date with changes or send an e-mail to users watching the issue.
This mechanism allows JIRA to process operations asynchronously. The advantage of this model is operations, such as sending e-mails, are separated from JIRA's core functions like issue creation. If there is a problem with the mail server, for example, then you will not want this problem to prevent your ...
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