chore: merge blocksuite source code (#9213)

blocksuite/framework/sync/src/utils/async-queue.ts

@@ -0,0 +1,102 @@
+export class AsyncQueue<T> {
+  private _queue: T[];
+
+  private _resolveUpdate: (() => void) | null = null;
+
+  private _waitForUpdate: Promise<void> | null = null;
+
+  get length() {
+    return this._queue.length;
+  }
+
+  constructor(init: T[] = []) {
+    this._queue = init;
+  }
+
+  clear() {
+    this._queue = [];
+  }
+
+  find(predicate: (update: T) => boolean) {
+    return this._queue.find(predicate);
+  }
+
+  async next(
+    abort?: AbortSignal,
+    dequeue: (arr: T[]) => T | undefined = a => a.shift()
+  ): Promise<T> {
+    const update = dequeue(this._queue);
+    if (update) {
+      return update;
+    } else {
+      if (!this._waitForUpdate) {
+        this._waitForUpdate = new Promise(resolve => {
+          this._resolveUpdate = resolve;
+        });
+      }
+
+      await Promise.race([
+        this._waitForUpdate,
+        new Promise((_, reject) => {
+          if (abort?.aborted) {
+            reject(abort?.reason);
+          }
+          abort?.addEventListener('abort', () => {
+            reject(abort.reason);
+          });
+        }),
+      ]);
+
+      return this.next(abort, dequeue);
+    }
+  }
+
+  push(...updates: T[]) {
+    this._queue.push(...updates);
+    if (this._resolveUpdate) {
+      const resolve = this._resolveUpdate;
+      this._resolveUpdate = null;
+      this._waitForUpdate = null;
+      resolve();
+    }
+  }
+
+  remove(predicate: (update: T) => boolean) {
+    const index = this._queue.findIndex(predicate);
+    if (index !== -1) {
+      this._queue.splice(index, 1);
+    }
+  }
+}
+
+export class PriorityAsyncQueue<
+  T extends { id: string },
+> extends AsyncQueue<T> {
+  constructor(
+    init: T[] = [],
+    readonly priorityTarget: SharedPriorityTarget = new SharedPriorityTarget()
+  ) {
+    super(init);
+  }
+
+  override next(abort?: AbortSignal | undefined): Promise<T> {
+    return super.next(abort, arr => {
+      if (this.priorityTarget.priorityRule !== null) {
+        const index = arr.findIndex(update =>
+          this.priorityTarget.priorityRule?.(update.id)
+        );
+        if (index !== -1) {
+          return arr.splice(index, 1)[0];
+        }
+      }
+      return arr.shift();
+    });
+  }
+}
+
+/**
+ * Shared priority target can be shared by multiple queues.
+ */
+export class SharedPriorityTarget {
+  priorityRule: ((id: string) => boolean) | null = null;
+}