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Instrument.js
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Instrument.js
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// TypeScript can't parse the MetricsClient type without explicitly importing it. On the other
// hand, JSDoc can. Prioritise documentation over type checking for now.
// @ts-nocheck
/**
* Provides a convenient API for writing an instrument.
*
* This class provides the same methods as {@link MetricsClient} but bound to the stream
* name/schema ID pair, allowing developers to minimize repetition.
*
* Further, each method will mix in a value for `funnel_event_sequence_position` to each submitted
* event. The value increases by 1 after the event is submitted. For example, if an instrument
* submits an `init` and a `click` event:
*
* ```
* // i is an instance of Instrument
* i.submitInteraciton( 'init' );
* i.submitClick( '#button', 'my_button' );
* ```
*
* then the events will look like `action="init",funnel_event_sequence_postion=0` and
* `action="click",funnel_event_sequence_position=1`.
*
* Note well that this class is not expected to be constructed directly. Instead, developers should
* use {@link MetricsClient#newInstrument}, e.g.
*
* ```
* const m = require( '/path/to/metrics-platform' ).createMetricsClient();
* const i = m.newInstrument( STREAM_NAME, SCHEMA_ID );
*
* // ...
*
* i.submitInteraction( 'init' );
* ```
*
* @param {MetricsClient} metricsClient
* @param {string} streamName
* @param {string} schemaID
* @constructor
*/
function Instrument( metricsClient, streamName, schemaID ) {
this.metricsClient = metricsClient;
this.streamName = streamName;
this.schemaID = schemaID;
this.eventSequencePosition = 1;
}
/**
* See {@link MetricsClient#isStreamInSample}.
*
* @return {boolean}
*/
Instrument.prototype.isStreamInSample = function () {
return this.metricsClient.isStreamInSample( this.streamName );
};
/**
* @return {boolean}
*/
Instrument.prototype.isEnabled = function () {
return this.isStreamInSample();
};
/**
* See {@link MetricsClient#submitInteraction}.
*
* @param {string} action
* @param {InteractionContextData} [interactionData]
*/
Instrument.prototype.submitInteraction = function ( action, interactionData ) {
interactionData = Object.assign(
{},
interactionData || {},
{
// eslint-disable-next-line camelcase
funnel_event_sequence_position: this.eventSequencePosition++
}
);
this.metricsClient.submitInteraction(
this.streamName,
this.schemaID,
action,
interactionData
);
};
/**
* See {@link MetricsClient#submitClick}.
*
* @param {ElementInteractionData} interactionData
*/
Instrument.prototype.submitClick = function ( interactionData ) {
// eslint-disable-next-line camelcase
interactionData.funnel_event_sequence_position = this.eventSequencePosition++;
this.metricsClient.submitClick( this.streamName, interactionData );
};
module.exports = Instrument;

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