setnx #

Sets a value on a key, only if it does not already exist.

[Redis documentation]

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setnx(key, value, [options], [callback]) #

Arguments	Type	Description
key	string	Key identifier
value	string	Value to store
options	JSON Object	Optional parameters
callback	function	Callback

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Options #

Option	Type	Description	Default
queuable	boolean	Make this request queuable or not	true

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Return Value #

Returns the MemoryStorage object to allow chaining.

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Callback Response #

Returns a boolean specifying if the operation was successful or not.

Usage #

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// Using callbacks (NodeJS or Web Browser)
kuzzle.memoryStorage.setnx('key', 'value', function (err, status) {
  // callback called once the action has completed
});
// Using promises (NodeJS only)
kuzzle.memoryStorage.setnxPromise('key', 'value')
  .then(status => {
    // resolved once the action has completed
  });

Callback response:

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true