β Bilanx, a fast and simplified command queue for 🂢 Deuces, a minimal Redis client. It is custom version of the ♎ Libra module, it handles only some commands, primarily pubsub ones and monitor. It implements an automatic rollback mechanism for subscriptions, when the connection is lost. It is heavily based on Train module, a well-tested and fast FIFO queue.
$ npm install bilanx [-g]// clone repo$ git clone email@example.com:rootslab/bilanx.git
install and update devDependencies:
$ cd bilanx/$ npm install --dev# update$ npm update --dev
var Bilanx = ;
$ cd bilanx/$ npm test
$ cd bilanx/$ npm run bench
NOTE: You should install devDependencies (Syllabus) for running benchmarks.
Create an instance, argument within [ ] is optional.
var l =// orvar l = opt
Default options are listed.
opt =// rollback queue max sizerollback : 64 * 1024// log the last access time to the queue's headtimestamps : false
WARNING: Don't mess with these properties.
// command queueBilanxcqueue : Train// status propertiesBilanxstatus :subscription :on : 0active : 0channels : 0patterns : 0last_update : -1monitoring :on : 0active : 0last_update : -1// it holds special AUTH commandauth :
Arguments within [ ] are optional.
/** Update the current auth status property. In this way the AUTH command* has priority over the other commands in the queue; when #pop() will be* called, it will return this command regardless if the command queue is* empty or not.** It returns the current auth status property ( encoded AUTH command ).** NOTE: only Syllabus AUTH command will be accepted and stored.*/Bilanx# : Object/** Update internal subscription status ( using a un/subscription reply ), passing the command and* the number of current subscribed channels, received as message reply. It returns the total number* of subscribed channels and patterns.** Examples: Bilanx#update( 'subscribe', 5 ) or Bilanx#update( 'unsubscribe', 3 )** NOTE: Except for subscription commands, QUIT is the only command accepted in pubsub mode.*/Bilanx# : Number/** Get the total number of channels/patterns in status.subscriptions*/Bilanx# : Bilanx/** Push a Syllabus command to the internal queue.* It returns the number of command objects currently in the queue, or -1* if the command wasn't allowed/pushed.** NOTE: only Syllabus commands are accepted.*/Bilanx# : Number/** Pop a Syllabus command from the internal queue.* It pops the current head of the command queue.*/Bilanx# : Object/** Get a element in the command queue without popping it.* The default position is 0.*/Bilanx# : Object/** Start rolling up.* From now, all items evicted from the queue could be restored, executing #rollBack().* Disable rollUp passing false.* It returns the current Bilanx instance.*/Bilanx# : Bilanx/** Do rollback; previously evicted items are restored to the head of queue.* Optionally, it is possible to re-enable rollUp mechanism after the rollBack,* passing true.* It returns the current Bilanx instance.** NOTE: no rollBack will be done if rollUp was not already activated.*/Bilanx# : Bilanx/** Apply a fn to every element of the internal command queue;* fn will get 3 arguments: Object element, Number index, Function done.* After that every fn will have called done(), the callback will be launched* with an err argument ( if any has occurred ) and a number, representing* the total processed / iterated elements in the queue.** If boolean "evict" was set to true, after the last fn call to done(),* the queue will be flushed.** NOTE: when queue size is 0, the callback will be immediately executed* with arguments: ( null, 0 ).** NOTE: on iteration, the size is fixed to the current queue size,* then it is possible to push other elements to the tail, these* added elements are not affected by iteration.*/Bilanx# : Bilanx/** Flush the internal queue, reset all internal status properties,* then disable rollback mechanism.* It returns the current Bilanx instance.*/Bilanx# : Bilanx/** Reset all internal status properties, then disable rollback mechanism.* It returns the current Bilanx instance.*/Bilanx# : Bilanx
Copyright (c) 2014 < Guglielmo Ferri : firstname.lastname@example.org >
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