volos-spikearrest-memory

volos-quota-memory

This is a memory-backed implementation of Spike Arrest support for Volos.

Once initialized, the interface to the module is exactly what is in the "volos-spikearrest-common" module. See that module for detailed docs.

Initialization

To initialize a SpikeArrest, you call "create" on the exported module and pass a single "options" object. It can contain the following parameters:

• timeUnit: How often the SpikeArrest resets - may be in seconds or minutes
• allow: The maximum number of requests to allow during the timeUnit.
• bufferSize: (optional, default = 0) if bufferSize > 0, SpikeArrest will attempt to smooth requests by returning only when the next appropriate execution window is available. bufferSize is how many requests to "queue" before returning (immediately) with a isAllowed = false.

Once the quota has been initialized, the module that is returned has the programming interface defined by the "volos-quota-common" module.

Example

var SpikeArrest = require('volos-spikearrest-memory');
var spikeArrest = SpikeArrest.create({
  timeUnit: 'second',
  allow: 10,
  bufferSize: 10
});

spikeArrest.apply({ key: 'Foo', weight: 1 }, function(err, result) {
  if (err) { throw err; }
  console.log('Status: %s', result.isAllowed);
});