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@@ -977,6 +977,43 @@ channels.asyncStart.bindStore(myStore, (data) => {
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});
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```
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#### `tracingChannel.hasSubscribers`
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<!-- YAML
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added:
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- v22.0.0
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- v20.13.0
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-->
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> Stability: 1 - Experimental
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* Returns: {boolean} `true` if any of the individual channels has a subscriber,
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`false` if not.
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This is a helper method available on a [`TracingChannel`][] instance to check if
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any of the [TracingChannel Channels][] have subscribers. A `true` is returned if
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any of them have at least one subscriber, a `false` is returned otherwise.
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```mjs
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import diagnostics_channel from 'node:diagnostics_channel';
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const channels = diagnostics_channel.tracingChannel('my-channel');
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if (channels.hasSubscribers) {
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// Do something
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}
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```
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```cjs
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const diagnostics_channel = require('node:diagnostics_channel');
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const channels = diagnostics_channel.tracingChannel('my-channel');
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if (channels.hasSubscribers) {
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// Do something
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}
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```
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### TracingChannel Channels
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A TracingChannel is a collection of several diagnostics\_channels representing
@@ -0,0 +1,51 @@
1 +
'use strict';
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const common = require('../common');
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const dc = require('diagnostics_channel');
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const assert = require('assert');
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const handler = common.mustNotCall();
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{
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const handlers = {
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start: common.mustNotCall()
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};
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const channel = dc.tracingChannel('test');
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assert.strictEqual(channel.hasSubscribers, false);
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channel.subscribe(handlers);
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assert.strictEqual(channel.hasSubscribers, true);
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channel.unsubscribe(handlers);
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assert.strictEqual(channel.hasSubscribers, false);
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channel.start.subscribe(handler);
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assert.strictEqual(channel.hasSubscribers, true);
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channel.start.unsubscribe(handler);
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assert.strictEqual(channel.hasSubscribers, false);
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}
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{
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const handlers = {
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asyncEnd: common.mustNotCall()
34 +
};
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const channel = dc.tracingChannel('test');
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assert.strictEqual(channel.hasSubscribers, false);
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channel.subscribe(handlers);
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assert.strictEqual(channel.hasSubscribers, true);
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channel.unsubscribe(handlers);
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assert.strictEqual(channel.hasSubscribers, false);
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channel.asyncEnd.subscribe(handler);
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assert.strictEqual(channel.hasSubscribers, true);
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channel.asyncEnd.unsubscribe(handler);
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assert.strictEqual(channel.hasSubscribers, false);
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}
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