nl_tokens: Constructor for DatasetClientsCleaner .
pl_tokens: function DatasetClientsCleaner ( opts ) { this . retentionPeriod = opts . retentionPeriod || '24h' ; this . checkFrequency = opts . checkFrequency || '1h' ; this . cleanerLockName = opts . cleanerLockName || 'locks:sync:DatasetCleaner' ; this . lockTimeout = parseDuration ( this . checkFrequency ) / 2 ; this . <mask> ; }