FutureProxy.php
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	<?php

	/**
	* Wraps another Future and allows you to post-process its result once it
	* resolves.
	*
	* @group futures
	* @stable
	*/
	abstract class FutureProxy extends Future {

	private $proxied;

	public function __construct(Future $proxied = null) {
	if ($proxied) {
	$this->setProxiedFuture($proxied);
	}
	}

	public function setProxiedFuture(Future $proxied) {
	$this->proxied = $proxied;
	return $this;
	}

	protected function getProxiedFuture() {
	if (!$this->proxied) {
	throw new Exception("The proxied future has not been provided yet.");
	}
	return $this->proxied;
	}

	public function isReady() {
	return $this->getProxiedFuture()->isReady();
	}

	public function resolve($timeout = null) {
	$this->getProxiedFuture()->resolve($timeout);
	return $this->getResult();
	}

	public function setException(Exception $ex) {
	$this->getProxiedFuture()->setException($ex);
	return $this;
	}

	public function getException() {
	return $this->getProxiedFuture()->getException();
	}

	public function getReadSockets() {
	return $this->getProxiedFuture()->getReadSockets();
	}

	public function getWriteSockets() {
	return $this->getProxiedFuture()->getWriteSockets();
	}

	protected function getResult() {
	if ($this->result === null) {
	$result = $this->getProxiedFuture()->resolve();
	$result = $this->didReceiveResult($result);
	$this->result = $result;
	}
	return $this->result;
	}

	public function start() {
	$this->getProxiedFuture()->start();
	return $this;
	}

	abstract protected function didReceiveResult($result);

	}