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<head><title>Commit-Time Callbacks </title>
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<h1>Commit-Time Callbacks</h1>
<p>Commit-time callbacks allow a user to add some specific
behavior just before and just after a transaction is committed. </p>
<p>Typical use-cases for commit-time callbacks:</p>
<ul>
<li value="1">Add constraint-violation checking before commit.</li>
<li value="2">Check application-specific conditions before commit is done.</li>
<li value="3">Start synchronization or backup after commit.</li>
<li value="4">Notify other clients/applications about
successful/unsuccessful commit.</li>
</ul>
<p>Commit-time callbacks can be triggered by the following 2 events:</p>
<ul>
<li value="1"><b>Committing</b>: Event
subscribers are notified before the container starts any meaningful commit
work and are allowed to cancel the entire operation by throwing an
exception; the object container instance is completely blocked while
subscribers are being notified which is both a blessing because
subscribers can count on a stable and safe environment and a curse because
it prevents any parallelism with the container;</li>
<li value="2"><b>Committed</b>:
Event subscribers are notified in a separate thread after the container has completely
finished the commit operation; exceptions if any will be ignored.
</li>
</ul>
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