SamplingController.js
No OneTemporary
Actions

Size

1 KB

Referenced Files

None

Subscribers

None

SamplingController.js
View Options

	const isValidSample = require( './StreamConfigUtils.js' ).isValidSample;

	const UINT32_MAX = 4294967295; // (2^32) - 1

	/**
	* Evaluate events for presence in sample based on the stream configuration.
	*
	* @param {Integration} integration
	* @constructor
	*/
	function SamplingController( integration ) {
	this.integration = integration;
	}

	/**
	* Determine whether a stream is in or out of sample.
	*
	* @param {?StreamConfig} streamConfig stream configuration
	* @return {boolean} true if in-sample, false if out-sample.
	*/
	SamplingController.prototype.isStreamInSample = function ( streamConfig ) {
	if ( !streamConfig ) {
	// If a stream is not defined, it is not in sample.
	return false;
	}

	if ( !streamConfig.sample ) {
	// If the stream does not specify sampling, it is in-sample.
	return true;
	}

	if ( !isValidSample( streamConfig.sample ) ) {
	return false;
	}

	let id;
	switch ( streamConfig.sample.unit ) {
	case 'pageview':
	id = this.integration.getPageviewId();
	break;
	case 'session':
	id = this.integration.getSessionId();
	break;
	default:
	return false;
	}

	return parseInt( id.slice( 0, 8 ), 16 ) / UINT32_MAX < streamConfig.sample.rate;
	};

	module.exports = SamplingController;