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| | 19 | <b>GetsetCommand: Contents</b><br> <a href="#GETSET _key_ _value_">GETSET _key_ _value_</a><br> <a href="#Return value">Return value</a><br> <a href="#Design patterns">Design patterns</a> |
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| | 22 | <h1 class="wikiname">GetsetCommand</h1> |
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| | 29 | #sidebar <a href="StringCommandsSidebar.html">StringCommandsSidebar</a><h1><a name="GETSET _key_ _value_">GETSET _key_ _value_</a></h1> |
| | 30 | <i>Time complexity: O(1)</i><blockquote>GETSET is an atomic <i>set this value and return the old value</i> command.Set <i>key</i> to the string <i>value</i> and return the old value stored at <i>key</i>.The string can't be longer than 1073741824 bytes (1 GB).</blockquote> |
| | 31 | <h2><a name="Return value">Return value</a></h2><a href="ReplyTypes.html">Bulk reply</a><h2><a name="Design patterns">Design patterns</a></h2><blockquote>GETSET can be used together with INCR for counting with atomic reset whena given condition arises. For example a process may call INCR against thekey <i>mycounter</i> every time some event occurred, but from time totime we need to get the value of the counter and reset it to zero atomicallyusing <code name="code" class="python">GETSET mycounter 0</code>.</blockquote> |
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