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✨ [Observable] Make observable safe to remove handler while firing. #37887

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Merged
mszylkowski merged 22 commits into from
Mar 17, 2022
Merged

✨ [Observable] Make observable safe to remove handler while firing. #37887

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mszylkowski Dec 21, 2021
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mszylkowski Dec 21, 2021
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mszylkowski Dec 28, 2021
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mszylkowski Jan 10, 2022
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mszylkowski Jan 25, 2022
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mszylkowski Jan 28, 2022
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mszylkowski Feb 10, 2022
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mszylkowski Mar 8, 2022
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Merge branch 'main' of github.com:ampproject/amphtml
mszylkowski Mar 10, 2022
974e219
Make observable work with removing items while firing
mszylkowski Mar 17, 2022
e0a87a1
Using set for removing
mszylkowski Mar 17, 2022
5dc4e93
Remove previous code
mszylkowski Mar 17, 2022
c5d9d63
Added iterating depth
mszylkowski Mar 17, 2022
e844875
Added test to check iterations of handler removal
mszylkowski Mar 17, 2022
09809c6
Simplified impl and cleaned unused tests
mszylkowski Mar 17, 2022
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mszylkowski Mar 17, 2022
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Using set for removing
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@mszylkowski
mszylkowski committed Mar 17, 2022
commit e0a87a15cd5e649133f36d72e4989b9215447661
12 changes: 8 additions & 4 deletions src/core/data-structures/observable.js
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
import {removeItem} from '#core/types/array';
import {remove, removeItem} from '#core/types/array';

/**
* This class helps to manage observers. Observers can be added, removed or
Expand All @@ -13,8 +13,8 @@ export class Observable {
/** @type {?Array<function(TYPE=):void>} */
this.handlers_ = null;

/** @type {!Array<function(TYPE=):void>} */
this.handlersToRemove_ = [];
/** @type {!Set<function(TYPE=):void>} */
this.handlersToRemove_ = new Set();

/** @type {boolean} */
this.iterating_ = false;
Expand Down Expand Up @@ -45,7 +45,7 @@ export class Observable {
return;
}
if (this.iterating_) {
this.handlersToRemove_.push(handler);
this.handlersToRemove_.add(handler);
} else {
removeItem(this.handlers_, handler);
}
Expand Down Expand Up @@ -77,6 +77,10 @@ export class Observable {
for (const handler of this.handlersToRemove_) {
removeItem(this.handlers_, handler);
}
if (this.handlersToRemove_.size) {
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@jridgewell jridgewell Mar 17, 2022

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Old Code?

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@mszylkowski mszylkowski Mar 17, 2022

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Yes, removing it now

remove(this.handlers_, (handler) => this.handlersToRemove_.has(handler));
this.handlersToRemove_.clear();
}
}

/**
Expand Down