Method use

lib/Pool.js:478–491

* [use method, aquires a resource, passes the resource to a user supplied function and releases it] * @param {Function} fn [a function that accepts a resource and returns a promise that resolves/rejects once it has finished using the resource] * @return {Promise} [resolves once the resou

(fn, priority)

   * @return {Promise}      [resolves once the resource is released to the pool]
   */
  use(fn, priority) {
    return this.acquire(priority).then(resource => {
      return fn(resource).then(
        result => {
          this.release(resource);
          return result;
        },
        err => {
          this.destroy(resource);
          throw err;
        }
      );
    });
  }

  /**
   * Check if resource is currently on loan from the pool