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Introduces new AsyncLocal API to provide capabilities for building continuation local storage on top of it. The implementation is based on async hooks. Public API is inspired by ThreadLocal class in Java. Co-authored-by: Gerhard Stoebich <[email protected]>
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,29 @@ | ||
'use strict'; | ||
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require('../common'); | ||
const assert = require('assert'); | ||
const async_hooks = require('async_hooks'); | ||
const { AsyncLocal } = async_hooks; | ||
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// This test ensures isolation of `AsyncLocal`s | ||
// from each other in terms of stored values | ||
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const asyncLocalOne = new AsyncLocal(); | ||
const asyncLocalTwo = new AsyncLocal(); | ||
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setTimeout(() => { | ||
assert.strictEqual(asyncLocalOne.get(), undefined); | ||
assert.strictEqual(asyncLocalTwo.get(), undefined); | ||
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asyncLocalOne.set('foo'); | ||
asyncLocalTwo.set('bar'); | ||
assert.strictEqual(asyncLocalOne.get(), 'foo'); | ||
assert.strictEqual(asyncLocalTwo.get(), 'bar'); | ||
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asyncLocalOne.set('baz'); | ||
asyncLocalTwo.set(42); | ||
setTimeout(() => { | ||
assert.strictEqual(asyncLocalOne.get(), 'baz'); | ||
assert.strictEqual(asyncLocalTwo.get(), 42); | ||
}, 0); | ||
}, 0); |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,30 @@ | ||
'use strict'; | ||
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require('../common'); | ||
const assert = require('assert'); | ||
const async_hooks = require('async_hooks'); | ||
const { AsyncLocal } = async_hooks; | ||
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// This test ensures correct work of the global hook | ||
// that serves for propagation of all `AsyncLocal`s | ||
// in the context of `.get()`/`.set(value)` calls | ||
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const asyncLocal = new AsyncLocal(); | ||
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setTimeout(() => { | ||
assert.strictEqual(asyncLocal.get(), undefined); | ||
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asyncLocal.set('A'); | ||
setTimeout(() => { | ||
assert.strictEqual(asyncLocal.get(), 'A'); | ||
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asyncLocal.set('B'); | ||
setTimeout(() => { | ||
assert.strictEqual(asyncLocal.get(), 'B'); | ||
}, 0); | ||
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assert.strictEqual(asyncLocal.get(), 'B'); | ||
}, 0); | ||
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assert.strictEqual(asyncLocal.get(), 'A'); | ||
}, 0); |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,30 @@ | ||
'use strict'; | ||
|
||
require('../common'); | ||
const assert = require('assert'); | ||
const async_hooks = require('async_hooks'); | ||
const { AsyncLocal } = async_hooks; | ||
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// This test ensures correct work of the global hook | ||
// that serves for propagation of all `AsyncLocal`s | ||
// in the context of `.remove()` call | ||
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const asyncLocalOne = new AsyncLocal(); | ||
asyncLocalOne.set(1); | ||
const asyncLocalTwo = new AsyncLocal(); | ||
asyncLocalTwo.set(2); | ||
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setImmediate(() => { | ||
// Removal of one local should not affect others | ||
asyncLocalTwo.remove(); | ||
assert.strictEqual(asyncLocalOne.get(), 1); | ||
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// Removal of the last active local should not | ||
// prevent propagation of locals created later | ||
asyncLocalOne.remove(); | ||
const asyncLocalThree = new AsyncLocal(); | ||
asyncLocalThree.set(3); | ||
setImmediate(() => { | ||
assert.strictEqual(asyncLocalThree.get(), 3); | ||
}); | ||
}); |
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