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   1  <?php
   2  
   3  namespace React\Promise;
   4  
   5  /**
   6   * @deprecated 2.8.0 LazyPromise is deprecated and should not be used anymore.
   7   */
   8  class LazyPromise implements ExtendedPromiseInterface, CancellablePromiseInterface
   9  {
  10      private $factory;
  11      private $promise;
  12  
  13      public function __construct(callable $factory)
  14      {
  15          $this->factory = $factory;
  16      }
  17  
  18      public function then(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
  19      {
  20          return $this->promise()->then($onFulfilled, $onRejected, $onProgress);
  21      }
  22  
  23      public function done(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
  24      {
  25          return $this->promise()->done($onFulfilled, $onRejected, $onProgress);
  26      }
  27  
  28      public function otherwise(callable $onRejected)
  29      {
  30          return $this->promise()->otherwise($onRejected);
  31      }
  32  
  33      public function always(callable $onFulfilledOrRejected)
  34      {
  35          return $this->promise()->always($onFulfilledOrRejected);
  36      }
  37  
  38      public function progress(callable $onProgress)
  39      {
  40          return $this->promise()->progress($onProgress);
  41      }
  42  
  43      public function cancel()
  44      {
  45          return $this->promise()->cancel();
  46      }
  47  
  48      /**
  49       * @internal
  50       * @see Promise::settle()
  51       */
  52      public function promise()
  53      {
  54          if (null === $this->promise) {
  55              try {
  56                  $this->promise = resolve(\call_user_func($this->factory));
  57              } catch (\Throwable $exception) {
  58                  $this->promise = new RejectedPromise($exception);
  59              } catch (\Exception $exception) {
  60                  $this->promise = new RejectedPromise($exception);
  61              }
  62          }
  63  
  64          return $this->promise;
  65      }
  66  }