joopschilder/reactphp-input-stream
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Simplified codebase in a major refactor before moving to initial Toalett release

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Joop Schilder 2021-01-06 18:11:09 +01:00
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1
.gitignore vendored
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/.idea/
/vendor/
/tags

125
README.md
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# ```reactphp-input-stream```
## What is this?
A compact library that can wrap a non-blocking input to behave like a [stream](https://reactphp.org/stream/) in a [ReactPHP EventLoop](https://reactphp.org/event-loop/).
# 🚽 Toalett
Welcome to Toalett, a humble initiative. Toalett is the Norwegian word for toilet 💩.
## What is `toalett/react-stream-adapter`?
It is a library that allows any datasource to be used as a stream with ReactPHP. It is very small - there
is [one interface](src/Source.php), [one class](src/StreamAdapter.php)
and [one trait](src/EndlessTrait.php). Its only dependency is `react/stream`.
The [`StreamAdapter`](src/StreamAdapter.php) takes an implementation of the [`Source`](src/Source.php) interface and
makes it approachable as a [stream](https://reactphp.org/stream/) in applications using
an [event loop](https://reactphp.org/event-loop/).
## Installation
It is available on [Packagist](https://packagist.org/packages/toalett/):
```bash
composer require toalett/react-stream-adapter
```
## Motivation
I was working on a project that required an application to respond to AMQP messages in a non-blocking way. The
application made use of an event loop. Initially I used a periodic timer with a callback, but as the application grew
this became a cluttered mess. It slowly started to feel more natural to treat the message queue as a stream. This makes
sense if you think about it:
> In computer science, a stream is a sequence of data elements made available over time. A stream can be thought of as items
> on a conveyor belt being processed one at a time rather than in large batches.
>
> &mdash; <cite> [Stream (computing) on Wikipedia](https://en.wikipedia.org/wiki/Stream_(computing)) </cite>
This definition suits a message queue.
In the project I mentioned earlier, I use this library to poll an AMQP queue every 10 seconds. This keeps my load low
and allows me to do other things in the meantime. This abstraction turned out really useful, so I thought that others
might enjoy it too.
## How do I use this?
Check out the `examples` folder. It contains a very basic example of a non-blocking input implementation, as well
as a very (_very_) lame joke generator.
## Why is this useful?
I needed to respond to incoming AMQP messages in my event loop and I was feeling adventurous.
Admittedly, I could have just used a periodic timer directly (that is what this library uses under the hood), but where's the fun in that?
There are only three components to worry about, and one of them is optional! The main components are
the [`Source`](src/Source.php) interface and the [`StreamAdapter`](src/StreamAdapter.php) class. The optional component
is the [`EndlessTrait`](src/EndlessTrait.php), which can be used in an endless source.
I hear you ask: "_Where's the code that deals with the AMQP messages_?"
While I was writing this, I felt like it would be useful to
separate the logic of dealing with input in a stream-like manner from the logic that
deals with AMQP messages.
This means you can reuse this library to map practically anything to a readable stream.
An extra-lame example of this can be found in `examples/jokes_example.php`.
The steps you need to take to use this library are as follows:
When the code for AMQP consumption as stream is finished, I will link it here.
1. Define a class that is able to generate or provide some data. It must implement the [`Source`](src/Source.php)
interface.
2. The `select()` method is called periodically. This is where you return your next piece of data. Make sure
the `select()` method returns anything that is not `null` when data is available (anything goes) or `null`
when there is none. You may add a typehint to your implementation of `select()` such as `select(): ?string`
or `select(): ?MyData` for improved clarity.
3. The interface also specifies the `close(): void` and `eof(): bool` methods. In an endless (infinite)
stream, `close()` may be left empty and `eof()` should return false (EOF is never reached).
The [`EndlessTrait`](src/EndlessTrait.php)
provides these implementations.
4. Use the [`StreamAdapter`](src/StreamAdapter.php) to attach your [`Source`](src/Source.php) to the loop.
5. Interact with the adapter as if it were any other `ReadableInputStream`.
## Where are the unit tests?
_Errrrrr..._
_Note:_ This library uses polling under the hood. The default polling interval is 0.5 seconds, though if checking for
data is an intensive operation, you might want to increase the interval a bit to prevent slowdowns. This is a tradeoff
between responsiveness and load. Custom intervals can be set by passing them as a third argument to
the [`StreamAdapter`](src/StreamAdapter.php) constructor.
## How do I install this?
This should do it [once it's available on Packagist](https://packagist.org/packages/joopschilder/):
```bash
composer require joopschilder/reactphp-input-stream
```
_Note:_ The [`StreamAdapter`](src/StreamAdapter.php) reads data eagerly from the source - it won't stop reading until
there is nothing left to read. This prevents congestion when high polling intervals are used but it might block
execution for a while when there is a lot of data to be read or if your `select()` routine takes some time.
## Mandatory block of example code
```php
// Say, we have an event loop...
$loop = Factory::create();
// And say, we have a non-blocking input called $input...
$input = new DemoNonBlockingInput();
$source = new MySource(); // implements Source
$stream = new StreamAdapter($source, $loop);
$stream->on('data', function(MyData $data) {
/* do something with data */
});
// Then we can create a ReadableStream from it like so:
$stream = new ReadableNonBlockingInputStream($input, $loop);
// If your 'select()' method takes a long time to execute, or you just don't
// feel like polling the input availability that often, you can
// set a custom polling interval by supplying an instance of PollingInterval
// as the third constructor parameter:
$lowPollingStream = new ReadableNonBlockingInputStream($input, $loop, new PollingInterval(5));
// Of course, the stream emits all expected events (except end)
$stream->on('data', fn() => print('m'));
$stream->on('error', fn() => print('e'));
$stream->on('close', fn() => print('c'));
// If you know what data your input returns, you may type-hint it:
$stream->on('data', fn(Joke $joke) => print($joke . PHP_EOL));
// Add a periodic timer for demonstration purposes
$loop->addPeriodicTimer(0.2, fn() => print('.'));
// And kick 'er off.
$loop->run();
```
Check out the [examples](examples) folder for some simple implementations.
## Questions
__Q__: _Where is the code that deals with AMQP messages_?
__A__: It will be released in a separate package, but it needs some work before it can be published.
__Q__: _Where are the tests_?
__A__: There is only one class, and it is mostly based on the `ReadableResourceStream` from `react/stream`. Tests might
be added later, but as of now, I don't really see the value. Feel free to create an issue if this bothers you!

34
composer.json
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{
"name": "joopschilder/reactphp-input-stream",
"description": "Wraps a non-blocking input to behave like a stream so it can be used in a ReactPHP EventLoop",
"name": "toalett/react-stream-adapter",
"type": "library",
"description": "Use any data source as a stream with ReactPHP",
"keywords": [
"react",
"reactphp",
"event-driven",
"non-blocking",
"readable",
"eventloop",
"io",
"nio",
"stream",
"source",
"adapter"
],
"homepage": "https://github.com/toalett-io/react-stream-adapter",
"license": "MIT",
"authors": [
{
"name": "Joop Schilder",
"email": "jnmschilder@protonmail.com"
"email": "jnmschilder@protonmail.com",
"homepage": "https://joopschilder.nl/"
}
],
"require": {
"php": "^7.4",
"react/event-loop": "^1.1",
"react/stream": "^1.1"
},
"autoload": {
"psr-4": {
"JoopSchilder\\React\\Stream\\NonBlockingInput\\": "src"
}
"Toalett\\React\\Stream\\": "src"
}
},
"require": {
"php": "^7.4",
"react/stream": "^1.0"
}
}

33
composer.lock generated
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@ -4,7 +4,7 @@
"Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
"This file is @generated automatically"
],
"content-hash": "eb4b86d14372d5f65b57683c22bd760f",
"content-hash": "4c4c46859db5407b7a4dc036efcca228",
"packages": [
{
"name": "evenement/evenement",
@ -47,6 +47,10 @@
"event-dispatcher",
"event-emitter"
],
"support": {
"issues": "https://github.com/igorw/evenement/issues",
"source": "https://github.com/igorw/evenement/tree/master"
},
"time": "2017-07-23T21:35:13+00:00"
},
{
@ -89,20 +93,24 @@
"asynchronous",
"event-loop"
],
"support": {
"issues": "https://github.com/reactphp/event-loop/issues",
"source": "https://github.com/reactphp/event-loop/tree/v1.1.1"
},
"time": "2020-01-01T18:39:52+00:00"
},
{
"name": "react/stream",
"version": "v1.1.0",
"version": "v1.1.1",
"source": {
"type": "git",
"url": "https://github.com/reactphp/stream.git",
"reference": "50426855f7a77ddf43b9266c22320df5bf6c6ce6"
"reference": "7c02b510ee3f582c810aeccd3a197b9c2f52ff1a"
},
"dist": {
"type": "zip",
"url": "https://api.github.com/repos/reactphp/stream/zipball/50426855f7a77ddf43b9266c22320df5bf6c6ce6",
"reference": "50426855f7a77ddf43b9266c22320df5bf6c6ce6",
"url": "https://api.github.com/repos/reactphp/stream/zipball/7c02b510ee3f582c810aeccd3a197b9c2f52ff1a",
"reference": "7c02b510ee3f582c810aeccd3a197b9c2f52ff1a",
"shasum": ""
},
"require": {
@ -112,7 +120,7 @@
},
"require-dev": {
"clue/stream-filter": "~1.2",
"phpunit/phpunit": "^6.4 || ^5.7 || ^4.8.35"
"phpunit/phpunit": "^7.0 || ^6.4 || ^5.7 || ^4.8.35"
},
"type": "library",
"autoload": {
@ -135,7 +143,11 @@
"stream",
"writable"
],
"time": "2019-01-01T16:15:09+00:00"
"support": {
"issues": "https://github.com/reactphp/stream/issues",
"source": "https://github.com/reactphp/stream/tree/v1.1.1"
},
"time": "2020-05-04T10:17:57+00:00"
}
],
"packages-dev": [],
@ -144,6 +156,9 @@
"stability-flags": [],
"prefer-stable": false,
"prefer-lowest": false,
"platform": [],
"platform-dev": []
"platform": {
"php": "^7.4"
},
"platform-dev": [],
"plugin-api-version": "2.0.0"
}

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examples/basic_example.php
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<?php
use JoopSchilder\React\Stream\NonBlockingInput\ReadableNonBlockingInputStream;
use React\EventLoop\Factory;
require_once __DIR__ . '/../vendor/autoload.php';
require_once __DIR__ . '/demo_classes.php';
$input = new DemoNonBlockingInput();
$loop = Factory::create();
$stream = new ReadableNonBlockingInputStream($input, $loop);
$stream->on('data', fn() => print('m'));
$stream->on('error', fn() => print('e'));
$stream->on('close', fn() => print('c'));
$loop->addPeriodicTimer(0.2, fn() => print('.'));
$loop->run();

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examples/classes.php Normal file
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<?php
use Toalett\React\Stream\EndlessTrait;
use Toalett\React\Stream\Source;
final class WillThrowExceptionAfter4Seconds implements Source
{
use EndlessTrait;
private const EMISSION_INTERVAL = 1.0;
private const SECONDS_BEFORE_EMITTING_ERROR = 4.0;
private float $lastEmission = 0;
private float $openedAt = 0;
public function open(): void
{
$this->openedAt = microtime(true);
}
public function select(): ?float
{
$now = microtime(true);
if ($now - $this->openedAt > self::SECONDS_BEFORE_EMITTING_ERROR) {
throw new RuntimeException('An error has occured!');
}
if ($now - $this->lastEmission > self::EMISSION_INTERVAL) {
$this->lastEmission = $now;
return $now;
}
return null;
}
}
final class Joker implements Source
{
use EndlessTrait;
private float $deadline = 0;
private array $jokes = [
'What did the Buddhist ask the hot dog vendor? - Make me one with everything.',
'You know why you never see elephants hiding up in trees? - Because they’re really good at it.',
'What is red and smells like blue paint? - Red paint.',
'A dyslexic man walks into a bra.',
'Where does the General keep his armies? - In his sleevies!',
'What do you call bears with no ears? - B',
'Why dont blind people skydive? - Because it scares the crap out of their dogs.',
];
public function open(): void
{
$this->scheduleNextJoke();
}
public function select(): ?string
{
if (microtime(true) < $this->deadline) {
return null;
}
$this->scheduleNextJoke();
return $this->jokes[array_rand($this->jokes)];
}
private function scheduleNextJoke(): void
{
$delay = mt_rand() / mt_getrandmax(); // somewhere between 0 - 1
$this->deadline = microtime(true) + (5.0 * $delay);
}
}
final class ReachesEofIn5Iterations implements Source
{
private array $buffer = [
'line 1',
'line 2',
'line 3',
'line 4',
'line 5',
];
public function open(): void
{
}
public function select(): ?string
{
return array_shift($this->buffer);
}
public function close(): void
{
}
public function eof(): bool
{
return count($this->buffer) === 0;
}
}

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examples/demo_classes.php
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@ -1,124 +0,0 @@
<?php
use JoopSchilder\React\Stream\NonBlockingInput\NonBlockingInputInterface;
/**
* Class DemoNonBlockingInput
* Provides an implementation of a non-blocking input that generates
* some data every second. After a lifetime of 4 seconds, an exception
* is thrown to show how the stream handles exceptions from the input.
*/
final class DemoNonBlockingInput implements NonBlockingInputInterface
{
private const DATA_AVAILABLE_INTERVAL_S = 1.0;
private const ERROR_AFTER_S = 4.0;
private float $lastEmission = 0;
private float $initialEmission = 0;
public function open(): void
{
$this->initialEmission = microtime(true);
}
public function select(): ?object
{
$now = microtime(true);
if ($now - $this->initialEmission > self::ERROR_AFTER_S) {
throw new Exception('Oh no!');
}
if ($now - $this->lastEmission > self::DATA_AVAILABLE_INTERVAL_S) {
$this->lastEmission = $now;
return new stdClass();
}
return null;
}
public function close(): void
{
}
}
/**
* Class Joke
* Used as a payload for the DemoJokeGenerator.
* @see DemoJokeGenerator
*/
final class Joke
{
private string $joke;
public function __construct(string $joke)
{
$this->joke = $joke;
}
public function __toString()
{
return $this->joke;
}
}
/**
* Class DemoJokeGenerator
* Generates a random joke at a random interval (0 - 2 seconds).
*/
final class DemoJokeGenerator implements NonBlockingInputInterface
{
private float $lastEmission = 0;
private float $deadline = 0;
private array $jokes = [
'What did the Buddhist ask the hot dog vendor? - Make me one with everything.',
'You know why you never see elephants hiding up in trees? - Because they’re really good at it.',
'What is red and smells like blue paint? - Red paint.',
'A dyslexic man walks into a bra.',
'Where does the General keep his armies? - In his sleevies!',
'What do you call bears with no ears? - B',
'Why dont blind people skydive? - Because it scares the crap out of their dogs.',
];
private function scheduleNextJoke()
{
$this->lastEmission = microtime(true);
$delay = mt_rand() / mt_getrandmax();
$this->deadline = $this->lastEmission + (2.0 * $delay);
}
public function open(): void
{
$this->scheduleNextJoke();
}
public function select(): ?object
{
$now = microtime(true);
if ($now > $this->deadline) {
$this->scheduleNextJoke();
return new Joke($this->jokes[array_rand($this->jokes)]);
}
return null;
}
public function close(): void
{
}
}

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examples/eof_in_5_iterations.php Normal file
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<?php
use React\EventLoop\Factory;
use Toalett\React\Stream\StreamAdapter;
require_once __DIR__ . '/../vendor/autoload.php';
require_once __DIR__ . '/classes.php';
$loop = Factory::create();
$stream = new StreamAdapter(new ReachesEofIn5Iterations(), $loop, 0.1);
$stream->on('data', fn(string $s) => printf('Data received: %s.%s', $s, PHP_EOL));
$stream->on('end', fn() => print('Stream reached eof.' . PHP_EOL));
$stream->on('close', fn() => print('Stream closed.' . PHP_EOL));
print(<<<EOF
This program demonstrates an example of a source that reaches EOF after 5 lines.
The stream adapter reads eagerly from the source: data is emitted as long as
select() on the source returns a non-null value. This means that all lines from
the source in this example ar read at once. If you want the adapter to read
at most one unit (message) from the source, you should probably be using a
periodic timer directly, or use time mechanics as used by the other examples.
EOF
);
$loop->run();

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examples/exception_after_4_seconds.php Normal file
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@ -0,0 +1,25 @@
<?php
use React\EventLoop\Factory;
use Toalett\React\Stream\StreamAdapter;
require_once __DIR__ . '/../vendor/autoload.php';
require_once __DIR__ . '/classes.php';
$loop = Factory::create();
$loop->addPeriodicTimer(0.2, fn() => print('.'));
$stream = new StreamAdapter(new WillThrowExceptionAfter4Seconds(), $loop);
$stream->on('data', fn() => print('Data received.' . PHP_EOL));
$stream->on('error', fn(Throwable $t) => print('Error: ' . $t->getMessage() . PHP_EOL));
$stream->on('close', fn() => print('Stream closed.' . PHP_EOL));
print(<<<EOF
This program demonstrates an example of a source that fails after 4 seconds.
Press CTRL+C to stop.
EOF
);
$loop->run();

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examples/infinite_stream_of_jokes.php Normal file
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@ -0,0 +1,23 @@
<?php
use React\EventLoop\Factory;
use Toalett\React\Stream\StreamAdapter;
require_once __DIR__ . '/../vendor/autoload.php';
require_once __DIR__ . '/classes.php';
$loop = Factory::create();
$stream = new StreamAdapter(new Joker(), $loop);
$stream->on('data', fn(string $joke) => print($joke . PHP_EOL));
print(<<<EOF
This program demonstrates an example of an endless source.
The stream presents a joke at random intervals (0.0 - 5.0 seconds).
Press CTRL+C to stop.
EOF
);
$loop->run();

16
examples/jokes_example.php
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@ -1,16 +0,0 @@
<?php
use JoopSchilder\React\Stream\NonBlockingInput\ReadableNonBlockingInputStream;
use React\EventLoop\Factory;
require_once __DIR__ . '/../vendor/autoload.php';
require_once __DIR__ . '/demo_classes.php';
$input = new DemoJokeGenerator();
$loop = Factory::create();
$stream = new ReadableNonBlockingInputStream($input, $loop);
$stream->on('data', fn(Joke $joke) => print($joke . PHP_EOL));
$loop->addPeriodicTimer(0.2, fn() => print('.' . PHP_EOL));
$loop->run();

15
src/EndlessTrait.php Normal file
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@ -0,0 +1,15 @@
<?php
namespace Toalett\React\Stream;
trait EndlessTrait
{
public function close(): void
{
}
public function eof(): bool
{
return false;
}
}

16
src/NonBlockingInputInterface.php
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@ -1,16 +0,0 @@
<?php
namespace JoopSchilder\React\Stream\NonBlockingInput;
interface NonBlockingInputInterface
{
function open(): void;
function select(): ?object;
function close(): void;
}

5
src/README.md Normal file
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@ -0,0 +1,5 @@
Three files, because there are only three things to do:
- Create a data source by implementing `Source`.
- If it is endless, use the `EndlessTrait` in your implementation.
- Create a readable stream with the `StreamAdapter`.

140
src/ReadableNonBlockingInputStream.php
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@ -1,140 +0,0 @@
<?php
namespace JoopSchilder\React\Stream\NonBlockingInput;
use Evenement\EventEmitter;
use JoopSchilder\React\Stream\NonBlockingInput\ValueObject\PollingInterval;
use React\EventLoop\LoopInterface;
use React\EventLoop\TimerInterface;
use React\Stream\ReadableResourceStream;
use React\Stream\ReadableStreamInterface;
use React\Stream\Util;
use React\Stream\WritableStreamInterface;
use RuntimeException;
use Throwable;
/**
* @see ReadableStreamInterface
* @see ReadableResourceStream
*/
final class ReadableNonBlockingInputStream extends EventEmitter implements ReadableStreamInterface
{
private NonBlockingInputInterface $input;
private LoopInterface $loop;
private PollingInterval $interval;
private ?TimerInterface $periodicTimer = null;
private bool $isClosed = false;
private bool $isListening = false;
/**
* @see ReadableStreamInterface
* @see ReadableResourceStream for an example
*/
public function __construct(NonBlockingInputInterface $input, LoopInterface $loop, ?PollingInterval $interval = null)
{
$this->input = $input;
$this->loop = $loop;
$this->interval = $interval ?? new PollingInterval();
$this->resume();
}
public function isReadable()
{
return !$this->isClosed;
}
/**
* @see ReadableResourceStream::pause()
* Pause consumption of the AMQP queue but do not mark the stream as closed
*/
public function pause()
{
if (!$this->isListening) {
return;
}
$this->input->close();
$this->loop->cancelTimer($this->periodicTimer);
$this->isListening = false;
}
/**
* @see ReadableResourceStream::resume()
* Register the consumer with the broker and add consumer again
*/
public function resume()
{
if ($this->isListening || $this->isClosed) {
return;
}
$this->input->open();
$this->periodicTimer = $this->loop->addPeriodicTimer(
$this->interval->getInterval(),
function () {
if ($data = $this->read()) {
$this->emit('data', [$data]);
}
}
);
$this->isListening = true;
}
/**
* @param WritableStreamInterface $dest
* @param array $options
* @return WritableStreamInterface
* @see ReadableResourceStream::pipe()
*/
public function pipe(WritableStreamInterface $dest, array $options = [])
{
return Util::pipe($this, $dest, $options);
}
/**
* @see ReadableResourceStream::close()
*/
public function close()
{
if ($this->isClosed) {
return;
}
$this->isClosed = true;
$this->emit('close');
$this->pause();
$this->removeAllListeners();
$this->input->close();
}
private function read(): ?object
{
try {
return $this->input->select();
} catch (Throwable $t) {
$this->emit('error', [
new RuntimeException('Unable to read data from input: ' . $t->getMessage(), 0, $t),
]);
$this->close();
}
return null;
}
}

17
src/Source.php Normal file
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@ -0,0 +1,17 @@
<?php
namespace Toalett\React\Stream;
interface Source
{
public function open(): void;
/**
* @return mixed|null
*/
public function select();
public function close(): void;
public function eof(): bool;
}

107
src/StreamAdapter.php Normal file
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@ -0,0 +1,107 @@
<?php
namespace Toalett\React\Stream;
use Evenement\EventEmitterTrait;
use React\EventLoop\LoopInterface;
use React\EventLoop\TimerInterface;
use React\Stream\ReadableResourceStream;
use React\Stream\ReadableStreamInterface;
use React\Stream\Util;
use React\Stream\WritableStreamInterface;
use RuntimeException;
use Throwable;
/**
* @see ReadableResourceStream
*/
final class StreamAdapter implements ReadableStreamInterface
{
use EventEmitterTrait;
private Source $source;
private LoopInterface $loop;
private float $pollingInterval;
private ?TimerInterface $timer = null;
private bool $closed = false;
private bool $listening = false;
public function __construct(Source $source, LoopInterface $loop, float $pollingInterval = 0.5)
{
$this->source = $source;
$this->loop = $loop;
$this->pollingInterval = $pollingInterval;
$this->resume();
}
public function isReadable(): bool
{
return !$this->closed;
}
public function pause(): void
{
if (!$this->listening) {
return;
}
$this->source->close();
$this->loop->cancelTimer($this->timer);
$this->listening = false;
}
public function resume(): void
{
if ($this->listening || $this->closed) {
return;
}
$this->source->open();
$this->timer = $this->loop->addPeriodicTimer($this->pollingInterval, function () {
while (!is_null($data = $this->read())) {
$this->emit('data', [$data]);
}
if ($this->source->eof()) {
$this->emit('end');
$this->close();
}
});
$this->listening = true;
}
public function pipe(WritableStreamInterface $dest, array $options = []): WritableStreamInterface
{
return Util::pipe($this, $dest, $options);
}
public function close(): void
{
if ($this->closed) {
return;
}
$this->closed = true;
$this->emit('close');
$this->pause();
$this->removeAllListeners();
$this->source->close();
}
/**
* @return mixed|null
*/
private function read()
{
try {
return $this->source->select();
} catch (Throwable $t) {
$this->emit('error', [new RuntimeException('Unable to read data from source: ' . $t->getMessage(), 0, $t)]);
$this->close();
}
return null;
}
}

29
src/ValueObject/PollingInterval.php
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@ -1,29 +0,0 @@
<?php
namespace JoopSchilder\React\Stream\NonBlockingInput\ValueObject;
use InvalidArgumentException;
final class PollingInterval
{
private const DEFAULT_INTERVAL = 0.05;
private float $interval;
public function __construct(float $interval = self::DEFAULT_INTERVAL)
{
if ($interval < 0.0) {
throw new InvalidArgumentException('Interval must be greater than 0');
}
$this->interval = $interval;
}
public function getInterval(): float
{
return $this->interval;
}
}