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#!/usr/bin/env php
<?php
use Sabre\Event\Promise;
use Sabre\Event\Loop;
use function Sabre\Event\coroutine;
require __DIR__ . '/../vendor/autoload.php';
/**
* This example shows demonstrates the Promise api.
*/
/* Creating a new promise */
$promise = new Promise();
/* After 2 seconds we fulfill it */
Loop\setTimeout(function() use ($promise) {
echo "Step 1\n";
$promise->fulfill("hello");
}, 2);
/* Callback chain */
$result = $promise
->then(function($value) {
echo "Step 2\n";
// Immediately returning a new value.
return $value . " world";
})
->then(function($value) {
echo "Step 3\n";
// This 'then' returns a new promise which we resolve later.
$promise = new Promise();
// Resolving after 2 seconds
Loop\setTimeout(function() use ($promise, $value) {
$promise->fulfill($value . ", how are ya?");
}, 2);
return $promise;
})
->then(function($value) {
echo "Step 4\n";
// This is the final event handler.
return $value . " you rock!";
})
// Making all async calls synchronous by waiting for the final result.
->wait();
echo $result, "\n";
/* Now an identical example, this time with coroutines. */
$result = coroutine(function() {
$promise = new Promise();
/* After 2 seconds we fulfill it */
Loop\setTimeout(function() use ($promise) {
echo "Step 1\n";
$promise->fulfill("hello");
}, 2);
$value = (yield $promise);
echo "Step 2\n";
$value .= ' world';
echo "Step 3\n";
$promise = new Promise();
Loop\setTimeout(function() use ($promise, $value) {
$promise->fulfill($value . ", how are ya?");
}, 2);
$value = (yield $promise);
echo "Step 4\n";
// This is the final event handler.
yield $value . " you rock!";
})->wait();
echo $result, "\n";