ecsy/lib/ObjectPool.js

Entity Component System in JS

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.ObjectPool = void 0;

class ObjectPool {
  // @todo Add initial size
  constructor(T, initialSize) {
    this.freeList = [];
    this.count = 0;
    this.T = T;
    this.isObjectPool = true;

    if (typeof initialSize !== "undefined") {
      this.expand(initialSize);
    }
  }

  acquire() {
    // Grow the list by 20%ish if we're out
    if (this.freeList.length <= 0) {
      this.expand(Math.round(this.count * 0.2) + 1);
    }

    var item = this.freeList.pop();
    return item;
  }

  release(item) {
    item.reset();
    this.freeList.push(item);
  }

  expand(count) {
    for (var n = 0; n < count; n++) {
      var clone = new this.T();
      clone._pool = this;
      this.freeList.push(clone);
    }

    this.count += count;
  }

  totalSize() {
    return this.count;
  }

  totalFree() {
    return this.freeList.length;
  }

  totalUsed() {
    return this.count - this.freeList.length;
  }

}

exports.ObjectPool = ObjectPool;