Amp\Observer::next PHP Method

Observer Class Documentation Show file Open project: amphp/amp

next() public method

Succeeds with true if an emitted value is available by calling getCurrent() or false if the observable has resolved. If the observable fails, the returned promise will fail with the same exception.

public next ( ) : Interop\Async\Promise
return	Interop\Async\Promise

    public function next() : Promise
    {
        if (isset($this->deferreds[$this->position])) {
            $future = $this->deferreds[$this->position];
            unset($this->values[$this->position], $this->deferreds[$this->position]);
            $future->resolve();
        }
        ++$this->position;
        if (\array_key_exists($this->position, $this->values)) {
            return new Success(true);
        }
        if ($this->resolved) {
            --$this->position;
            if ($this->exception) {
                return new Failure($this->exception);
            }
            return new Success(false);
        }
        $this->deferred = new Deferred();
        return $this->deferred->promise();
    }

Observer

__construct

__destruct

drain

getCurrent

getResult

observe