@angular/core
Version:
Angular - the core framework
82 lines • 11.5 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { consumerAfterComputation, consumerBeforeComputation, consumerDestroy, consumerMarkDirty, consumerPollProducersForChange, isInNotificationPhase, REACTIVE_NODE, SIGNAL } from './graph';
export function createWatch(fn, schedule, allowSignalWrites) {
const node = Object.create(WATCH_NODE);
if (allowSignalWrites) {
node.consumerAllowSignalWrites = true;
}
node.fn = fn;
node.schedule = schedule;
const registerOnCleanup = (cleanupFn) => {
node.cleanupFn = cleanupFn;
};
function isWatchNodeDestroyed(node) {
return node.fn === null && node.schedule === null;
}
function destroyWatchNode(node) {
if (!isWatchNodeDestroyed(node)) {
consumerDestroy(node); // disconnect watcher from the reactive graph
node.cleanupFn();
// nullify references to the integration functions to mark node as destroyed
node.fn = null;
node.schedule = null;
node.cleanupFn = NOOP_CLEANUP_FN;
}
}
const run = () => {
if (node.fn === null) {
// trying to run a destroyed watch is noop
return;
}
if (isInNotificationPhase()) {
throw new Error(`Schedulers cannot synchronously execute watches while scheduling.`);
}
node.dirty = false;
if (node.hasRun && !consumerPollProducersForChange(node)) {
return;
}
node.hasRun = true;
const prevConsumer = consumerBeforeComputation(node);
try {
node.cleanupFn();
node.cleanupFn = NOOP_CLEANUP_FN;
node.fn(registerOnCleanup);
}
finally {
consumerAfterComputation(node, prevConsumer);
}
};
node.ref = {
notify: () => consumerMarkDirty(node),
run,
cleanup: () => node.cleanupFn(),
destroy: () => destroyWatchNode(node),
[SIGNAL]: node,
};
return node.ref;
}
const NOOP_CLEANUP_FN = () => { };
// Note: Using an IIFE here to ensure that the spread assignment is not considered
// a side-effect, ending up preserving `COMPUTED_NODE` and `REACTIVE_NODE`.
// TODO: remove when https://github.com/evanw/esbuild/issues/3392 is resolved.
const WATCH_NODE = /* @__PURE__ */ (() => {
return {
...REACTIVE_NODE,
consumerIsAlwaysLive: true,
consumerAllowSignalWrites: false,
consumerMarkedDirty: (node) => {
if (node.schedule !== null) {
node.schedule(node.ref);
}
},
hasRun: false,
cleanupFn: NOOP_CLEANUP_FN,
};
})();
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If registered, the\n * cleanup logic runs before the next watch execution.\n */\nexport type WatchCleanupFn = () => void;\n\n/**\n * A callback passed to the watch function that makes it possible to register cleanup logic.\n */\nexport type WatchCleanupRegisterFn = (cleanupFn: WatchCleanupFn) => void;\n\nexport interface Watch {\n  notify(): void;\n\n  /**\n   * Execute the reactive expression in the context of this `Watch` consumer.\n   *\n   * Should be called by the user scheduling algorithm when the provided\n   * `schedule` hook is called by `Watch`.\n   */\n  run(): void;\n\n  cleanup(): void;\n\n  /**\n   * Destroy the watcher:\n   * - disconnect it from the reactive graph;\n   * - mark it as destroyed so subsequent run and notify operations are noop.\n   */\n  destroy(): void;\n\n  [SIGNAL]: WatchNode;\n}\nexport interface WatchNode extends ReactiveNode {\n  hasRun: boolean;\n  fn: ((onCleanup: WatchCleanupRegisterFn) => void)|null;\n  schedule: ((watch: Watch) => void)|null;\n  cleanupFn: WatchCleanupFn;\n  ref: Watch;\n}\n\nexport function createWatch(\n    fn: (onCleanup: WatchCleanupRegisterFn) => void, schedule: (watch: Watch) => void,\n    allowSignalWrites: boolean): Watch {\n  const node: WatchNode = Object.create(WATCH_NODE);\n  if (allowSignalWrites) {\n    node.consumerAllowSignalWrites = true;\n  }\n\n  node.fn = fn;\n  node.schedule = schedule;\n\n  const registerOnCleanup = (cleanupFn: WatchCleanupFn) => {\n    node.cleanupFn = cleanupFn;\n  };\n\n  function isWatchNodeDestroyed(node: WatchNode) {\n    return node.fn === null && node.schedule === null;\n  }\n\n  function destroyWatchNode(node: WatchNode) {\n    if (!isWatchNodeDestroyed(node)) {\n      consumerDestroy(node);  // disconnect watcher from the reactive graph\n      node.cleanupFn();\n\n      // nullify references to the integration functions to mark node as destroyed\n      node.fn = null;\n      node.schedule = null;\n      node.cleanupFn = NOOP_CLEANUP_FN;\n    }\n  }\n\n  const run = () => {\n    if (node.fn === null) {\n      // trying to run a destroyed watch is noop\n      return;\n    }\n\n    if (isInNotificationPhase()) {\n      throw new Error(`Schedulers cannot synchronously execute watches while scheduling.`);\n    }\n\n    node.dirty = false;\n    if (node.hasRun && !consumerPollProducersForChange(node)) {\n      return;\n    }\n    node.hasRun = true;\n\n    const prevConsumer = consumerBeforeComputation(node);\n    try {\n      node.cleanupFn();\n      node.cleanupFn = NOOP_CLEANUP_FN;\n      node.fn(registerOnCleanup);\n    } finally {\n      consumerAfterComputation(node, prevConsumer);\n    }\n  };\n\n  node.ref = {\n    notify: () => consumerMarkDirty(node),\n    run,\n    cleanup: () => node.cleanupFn(),\n    destroy: () => destroyWatchNode(node),\n    [SIGNAL]: node,\n  };\n\n  return node.ref;\n}\n\nconst NOOP_CLEANUP_FN: WatchCleanupFn = () => {};\n\n// Note: Using an IIFE here to ensure that the spread assignment is not considered\n// a side-effect, ending up preserving `COMPUTED_NODE` and `REACTIVE_NODE`.\n// TODO: remove when https://github.com/evanw/esbuild/issues/3392 is resolved.\nconst WATCH_NODE: Partial<WatchNode> = /* @__PURE__ */ (() => {\n  return {\n    ...REACTIVE_NODE,\n    consumerIsAlwaysLive: true,\n    consumerAllowSignalWrites: false,\n    consumerMarkedDirty: (node: WatchNode) => {\n      if (node.schedule !== null) {\n        node.schedule(node.ref);\n      }\n    },\n    hasRun: false,\n    cleanupFn: NOOP_CLEANUP_FN,\n  };\n})();\n"]}