Initial project import

node_modules/three-stdlib/utils/WorkerPool.js

@@ -0,0 +1,63 @@
+class WorkerPool {
+  constructor(pool = 4) {
+    this.pool = pool;
+    this.queue = [];
+    this.workers = [];
+    this.workersResolve = [];
+    this.workerStatus = 0;
+  }
+  _initWorker(workerId) {
+    if (!this.workers[workerId]) {
+      const worker = this.workerCreator();
+      worker.addEventListener("message", this._onMessage.bind(this, workerId));
+      this.workers[workerId] = worker;
+    }
+  }
+  _getIdleWorker() {
+    for (let i = 0; i < this.pool; i++)
+      if (!(this.workerStatus & 1 << i))
+        return i;
+    return -1;
+  }
+  _onMessage(workerId, msg) {
+    const resolve = this.workersResolve[workerId];
+    resolve && resolve(msg);
+    if (this.queue.length) {
+      const { resolve: resolve2, msg: msg2, transfer } = this.queue.shift();
+      this.workersResolve[workerId] = resolve2;
+      this.workers[workerId].postMessage(msg2, transfer);
+    } else {
+      this.workerStatus ^= 1 << workerId;
+    }
+  }
+  setWorkerCreator(workerCreator) {
+    this.workerCreator = workerCreator;
+  }
+  setWorkerLimit(pool) {
+    this.pool = pool;
+  }
+  postMessage(msg, transfer) {
+    return new Promise((resolve) => {
+      const workerId = this._getIdleWorker();
+      if (workerId !== -1) {
+        this._initWorker(workerId);
+        this.workerStatus |= 1 << workerId;
+        this.workersResolve[workerId] = resolve;
+        this.workers[workerId].postMessage(msg, transfer);
+      } else {
+        this.queue.push({ resolve, msg, transfer });
+      }
+    });
+  }
+  dispose() {
+    this.workers.forEach((worker) => worker.terminate());
+    this.workersResolve.length = 0;
+    this.workers.length = 0;
+    this.queue.length = 0;
+    this.workerStatus = 0;
+  }
+}
+export {
+  WorkerPool
+};
+//# sourceMappingURL=WorkerPool.js.map