94 lines
2.4 KiB
JavaScript
94 lines
2.4 KiB
JavaScript
'use strict';
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const v8Util = process.atomBinding('v8_util');
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class ObjectsRegistry {
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constructor() {
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this.nextId = 0;
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// Stores all objects by ref-counting.
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// (id) => {object, count}
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this.storage = {};
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// Stores the IDs of objects referenced by WebContents.
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// (webContentsId) => [id]
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this.owners = {};
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}
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// Register a new object and return its assigned ID. If the object is already
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// registered then the already assigned ID would be returned.
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add(webContents, obj) {
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// Get or assign an ID to the object.
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let id = this.saveToStorage(obj);
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// Add object to the set of referenced objects.
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let webContentsId = webContents.getId();
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let owner = this.owners[webContentsId];
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if (!owner) {
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owner = this.owners[webContentsId] = new Set();
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// Clear the storage when webContents is reloaded/navigated.
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webContents.once('render-view-deleted', (event, id) => {
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this.clear(id);
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});
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}
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if (!owner.has(id)) {
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owner.add(id);
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// Increase reference count if not referenced before.
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this.storage[id].count++;
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}
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return id;
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}
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// Get an object according to its ID.
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get(id) {
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return this.storage[id].object;
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}
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// Dereference an object according to its ID.
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remove(webContentsId, id) {
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// Dereference from the storage.
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this.dereference(id);
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// Also remove the reference in owner.
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this.owners[webContentsId].delete(id);
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}
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// Clear all references to objects refrenced by the WebContents.
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clear(webContentsId) {
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let owner = this.owners[webContentsId];
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if (!owner)
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return;
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for (let id of owner)
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this.dereference(id);
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delete this.owners[webContentsId];
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}
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// Private: Saves the object into storage and assigns an ID for it.
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saveToStorage(object) {
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let id = v8Util.getHiddenValue(object, 'atomId');
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if (!id) {
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id = ++this.nextId;
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this.storage[id] = {
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count: 0,
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object: object
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};
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v8Util.setHiddenValue(object, 'atomId', id);
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}
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return id;
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}
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// Private: Dereference the object from store.
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dereference(id) {
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let pointer = this.storage[id];
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if (pointer == null) {
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return;
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}
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pointer.count -= 1;
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if (pointer.count === 0) {
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v8Util.deleteHiddenValue(pointer.object, 'atomId');
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return delete this.storage[id];
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}
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}
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}
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module.exports = new ObjectsRegistry;
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