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Speedup KnockoutJS by simplifying components loader system.

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Custom loaders are not used, so it is removed
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djmaze 2021-09-29 12:51:51 +02:00
parent 4142526ba6
commit bcc3dc51ef
5 changed files with 286 additions and 620 deletions
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221
vendors/knockout/src/components/loaderRegistry.js vendored
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@ -1,138 +1,137 @@
(() => {
var loadingSubscribablesCache = {}, // Tracks component loads that are currently in flight
loadedDefinitionsCache = {}; // Tracks component loads that have already completed
var loadingSubscribablesCache = Object.create(null), // Tracks component loads that are currently in flight
loadedDefinitionsCache = Object.create(null); // Tracks component loads that have already completed
ko.components = {
get: (componentName, callback) => {
var cachedDefinition = getObjectOwnProperty(loadedDefinitionsCache, componentName);
var cachedDefinition = loadedDefinitionsCache[componentName];
if (cachedDefinition) {
// It's already loaded and cached. Reuse the same definition object.
// Note that for API consistency, even cache hits complete asynchronously by default.
// You can bypass this by putting synchronous:true on your component config.
if (cachedDefinition.isSynchronousComponent) {
ko.dependencyDetection.ignore(() => // See comment in loaderRegistryBehaviors.js for reasoning
callback(cachedDefinition.definition)
);
} else {
ko.tasks.schedule(() => callback(cachedDefinition.definition) );
}
ko.tasks.schedule(() => callback(cachedDefinition.definition) );
} else {
// Join the loading process that is already underway, or start a new one.
loadComponentAndNotify(componentName, callback);
var subscribable = loadingSubscribablesCache[componentName],
completedAsync;
if (subscribable) {
subscribable.subscribe(callback);
} else {
// It's not started loading yet. Start loading, and when it's done, move it to loadedDefinitionsCache.
subscribable = loadingSubscribablesCache[componentName] = new ko.subscribable();
subscribable.subscribe(callback);
beginLoadingComponent(componentName, definition => {
loadedDefinitionsCache[componentName] = { definition: definition };
delete loadingSubscribablesCache[componentName];
// For API consistency, all loads complete asynchronously. However we want to avoid
// adding an extra task schedule if it's unnecessary (i.e., the completion is already
// async).
//
// You can bypass the 'always asynchronous' feature by putting the synchronous:true
// flag on your component configuration when you register it.
if (completedAsync) {
// Note that notifySubscribers ignores any dependencies read within the callback.
// See comment in loaderRegistryBehaviors.js for reasoning
subscribable['notifySubscribers'](definition);
} else {
ko.tasks.schedule(() => subscribable['notifySubscribers'](definition));
}
});
completedAsync = true;
}
}
},
clearCachedDefinition: componentName =>
delete loadedDefinitionsCache[componentName]
,
delete loadedDefinitionsCache[componentName],
_getFirstResultFromLoaders: getFirstResultFromLoaders
register: (componentName, config) => {
if (!config) {
throw new Error('Invalid configuration for ' + componentName);
}
if (defaultConfigRegistry[componentName]) {
throw new Error('Component ' + componentName + ' is already registered');
}
defaultConfigRegistry[componentName] = config;
}
};
function getObjectOwnProperty(obj, propName) {
return Object.prototype.hasOwnProperty.call(obj, propName) ? obj[propName] : undefined;
// The default loader is responsible for two things:
// 1. Maintaining the default in-memory registry of component configuration objects
// (i.e., the thing you're writing to when you call ko.components.register(someName, ...))
// 2. Answering requests for components by fetching configuration objects
// from that default in-memory registry and resolving them into standard
// component definition objects (of the form { createViewModel: ..., template: ... })
// Custom loaders may override either of these facilities, i.e.,
// 1. To supply configuration objects from some other source (e.g., conventions)
// 2. Or, to resolve configuration objects by loading viewmodels/templates via arbitrary logic.
var defaultConfigRegistry = Object.create(null);
var createViewModelKey = 'createViewModel';
// Takes a config object of the form { template: ..., viewModel: ... }, and asynchronously convert it
// into the standard component definition format:
// { template: <ArrayOfDomNodes>, createViewModel: function(params, componentInfo) { ... } }.
// Since both template and viewModel may need to be resolved asynchronously, both tasks are performed
// in parallel, and the results joined when both are ready. We don't depend on any promises infrastructure,
// so this is implemented manually below.
function loadComponent(componentName, callback) {
var result = {},
config = defaultConfigRegistry[componentName] || {},
templateConfig = config['template'],
viewModelConfig = config['viewModel'];
if (templateConfig) {
if (!templateConfig['element']) {
throwError(componentName, 'Unknown template value: ' + templateConfig);
}
// Element ID - find it, then copy its child nodes
var element = templateConfig['element'];
var elemInstance = document.getElementById(element);
if (!elemInstance) {
throwError(componentName, 'Cannot find element with ID ' + element);
}
if (!elemInstance.matches('TEMPLATE')) {
throwError(componentName, 'Template Source Element not a <template>');
}
// For browsers with proper <template> element support (i.e., where the .content property
// gives a document fragment), use that document fragment.
result['template'] = ko.utils.cloneNodes(elemInstance.content.childNodes);
}
if (viewModelConfig) {
if (typeof viewModelConfig[createViewModelKey] !== 'function') {
throwError(componentName, 'Unknown viewModel value: ' + viewModelConfig);
}
// Already a factory function - use it as-is
result[createViewModelKey] = viewModelConfig[createViewModelKey];
}
if (result['template'] && result[createViewModelKey]) {
callback(result);
} else {
callback(null);
}
}
function loadComponentAndNotify(componentName, callback) {
var subscribable = getObjectOwnProperty(loadingSubscribablesCache, componentName),
completedAsync;
if (!subscribable) {
// It's not started loading yet. Start loading, and when it's done, move it to loadedDefinitionsCache.
subscribable = loadingSubscribablesCache[componentName] = new ko.subscribable();
subscribable.subscribe(callback);
beginLoadingComponent(componentName, (definition, config) => {
var isSynchronousComponent = !!(config && config['synchronous']);
loadedDefinitionsCache[componentName] = { definition: definition, isSynchronousComponent: isSynchronousComponent };
delete loadingSubscribablesCache[componentName];
// For API consistency, all loads complete asynchronously. However we want to avoid
// adding an extra task schedule if it's unnecessary (i.e., the completion is already
// async).
//
// You can bypass the 'always asynchronous' feature by putting the synchronous:true
// flag on your component configuration when you register it.
if (completedAsync || isSynchronousComponent) {
// Note that notifySubscribers ignores any dependencies read within the callback.
// See comment in loaderRegistryBehaviors.js for reasoning
subscribable['notifySubscribers'](definition);
} else {
ko.tasks.schedule(() => subscribable['notifySubscribers'](definition));
}
});
completedAsync = true;
} else {
subscribable.subscribe(callback);
}
function throwError(componentName, message) {
throw new Error(`Component '${componentName}': ${message}`)
}
function beginLoadingComponent(componentName, callback) {
getFirstResultFromLoaders('getConfig', [componentName], config => {
if (config) {
// We have a config, so now load its definition
getFirstResultFromLoaders('loadComponent', [componentName, config], definition =>
callback(definition, config)
);
} else {
// The component has no config - it's unknown to all the loaders.
// Note that this is not an error (e.g., a module loading error) - that would abort the
// process and this callback would not run. For this callback to run, all loaders must
// have confirmed they don't know about this component.
callback(null, null);
}
// Try the candidates
var found = false;
loadComponent(componentName, result => {
// This candidate returned a value. Use it.
(found = result != null) && callback(result);
});
}
function getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders) {
// On the first call in the stack, start with the full set of loaders
if (!candidateLoaders) {
candidateLoaders = ko.components['loaders'].slice(0); // Use a copy, because we'll be mutating this array
}
// Try the next candidate
var currentCandidateLoader = candidateLoaders.shift();
if (currentCandidateLoader) {
var methodInstance = currentCandidateLoader[methodName];
if (methodInstance) {
var wasAborted = false,
synchronousReturnValue = methodInstance.apply(currentCandidateLoader, argsExceptCallback.concat(function(result) {
if (wasAborted) {
callback(null);
} else if (result !== null) {
// This candidate returned a value. Use it.
callback(result);
} else {
// Try the next candidate
getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders);
}
}));
// Currently, loaders may not return anything synchronously. This leaves open the possibility
// that we'll extend the API to support synchronous return values in the future. It won't be
// a breaking change, because currently no loader is allowed to return anything except undefined.
if (synchronousReturnValue !== undefined) {
wasAborted = true;
// Method to suppress exceptions will remain undocumented. This is only to keep
// KO's specs running tidily, since we can observe the loading got aborted without
// having exceptions cluttering up the console too.
if (!currentCandidateLoader['suppressLoaderExceptions']) {
throw new Error('Component loaders must supply values by invoking the callback, not by returning values synchronously.');
}
}
} else {
// This candidate doesn't have the relevant handler. Synchronously move on to the next one.
getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders);
}
} else {
if (!found) {
// No candidates returned a value
callback(null);
}
}
// Reference the loaders via string name so it's possible for developers
// to replace the whole array by assigning to ko.components.loaders
ko.components['loaders'] = [];
ko.exportSymbol('components', ko.components);
ko.exportSymbol('components.register', ko.components.register);
})();