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e9b6d321f3
Adds a new top-level subscribe/unsubscribe which will ref/unref the channel WeakReference to prevent subscriptions from getting garbage collected. PR-URL: https://github.com/nodejs/node/pull/42714 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Chengzhong Wu <legendecas@gmail.com> Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> Reviewed-By: Vladimir de Turckheim <vlad2t@hotmail.com>
45 lines
1.2 KiB
JavaScript
45 lines
1.2 KiB
JavaScript
'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 { Channel } = dc;
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const name = 'test';
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const input = {
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foo: 'bar'
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};
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// Individual channel objects can be created to avoid future lookups
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const channel = dc.channel(name);
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assert.ok(channel instanceof Channel);
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// No subscribers yet, should not publish
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assert.ok(!channel.hasSubscribers);
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const subscriber = common.mustCall((message, name) => {
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assert.strictEqual(name, channel.name);
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assert.deepStrictEqual(message, input);
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});
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// Now there's a subscriber, should publish
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dc.subscribe(name, subscriber);
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assert.ok(channel.hasSubscribers);
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// The ActiveChannel prototype swap should not fail instanceof
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assert.ok(channel instanceof Channel);
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// Should trigger the subscriber once
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channel.publish(input);
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// Should not publish after subscriber is unsubscribed
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assert.ok(dc.unsubscribe(name, subscriber));
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assert.ok(!channel.hasSubscribers);
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// unsubscribe() should return false when subscriber is not found
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assert.ok(!dc.unsubscribe(name, subscriber));
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assert.throws(() => {
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dc.subscribe(name, null);
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}, { code: 'ERR_INVALID_ARG_TYPE' });
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