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PHP7 Chain Of Responsibilities

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This commit is contained in:
Dominik Liebler
2016-09-22 12:17:22 +02:00
parent ea8c91ac68
commit 2b4b3beeff
10 changed files with 178 additions and 226 deletions
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37
Behavioral/ChainOfResponsibilities/Responsible/FastStorage.php
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@@ -1,37 +0,0 @@
<?php
namespace DesignPatterns\Behavioral\ChainOfResponsibilities\Responsible;
use DesignPatterns\Behavioral\ChainOfResponsibilities\Handler;
use DesignPatterns\Behavioral\ChainOfResponsibilities\Request;
class FastStorage extends Handler
{
/**
* @var array
*/
protected $data = array();
/**
* @param array $data
*/
public function __construct($data = array())
{
$this->data = $data;
}
protected function processing(Request $req)
{
if ('get' === $req->verb) {
if (array_key_exists($req->key, $this->data)) {
// the handler IS responsible and then processes the request
$req->response = $this->data[$req->key];
// instead of returning true, I could return the value but it proves
// to be a bad idea. What if the value IS "false" ?
return true;
}
}
return false;
}
}

45
Behavioral/ChainOfResponsibilities/Responsible/HttpInMemoryCacheHandler.php Normal file
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<?php
namespace DesignPatterns\Behavioral\ChainOfResponsibilities\Responsible;
use DesignPatterns\Behavioral\ChainOfResponsibilities\Handler;
use Psr\Http\Message\RequestInterface;
class HttpInMemoryCacheHandler extends Handler
{
/**
* @var array
*/
private $data;
/**
* @param array $data
* @param Handler|null $successor
*/
public function __construct(array $data, Handler $successor = null)
{
parent::__construct($successor);
$this->data = $data;
}
/**
* @param RequestInterface $request
*
* @return string|null
*/
protected function processing(RequestInterface $request)
{
$key = sprintf(
'%s?%s',
$request->getUri()->getPath(),
$request->getUri()->getQuery()
);
if ($request->getMethod() == 'GET' && isset($this->data[$key])) {
return $this->data[$key];
}
return null;
}
}

21
Behavioral/ChainOfResponsibilities/Responsible/SlowDatabaseHandler.php Normal file
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<?php
namespace DesignPatterns\Behavioral\ChainOfResponsibilities\Responsible;
use DesignPatterns\Behavioral\ChainOfResponsibilities\Handler;
use Psr\Http\Message\RequestInterface;
class SlowDatabaseHandler extends Handler
{
/**
* @param RequestInterface $request
*
* @return string|null
*/
protected function processing(RequestInterface $request)
{
// this is a mockup, in production code you would ask a slow (compared to in-memory) DB for the results
return 'Hello World!';
}
}

44
Behavioral/ChainOfResponsibilities/Responsible/SlowStorage.php
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@@ -1,44 +0,0 @@
<?php
namespace DesignPatterns\Behavioral\ChainOfResponsibilities\Responsible;
use DesignPatterns\Behavioral\ChainOfResponsibilities\Handler;
use DesignPatterns\Behavioral\ChainOfResponsibilities\Request;
/**
* This is mostly the same code as FastStorage but in fact, it may greatly differs.
*
* One important fact about CoR: each item in the chain MUST NOT assume its position
* in the chain. A CoR is not responsible if the request is not handled UNLESS
* you make an "ExceptionHandler" which throws exception if the request goes there.
*
* To be really extendable, each handler doesn't know if there is something after it.
*/
class SlowStorage extends Handler
{
/**
* @var array
*/
protected $data = array();
/**
* @param array $data
*/
public function __construct($data = array())
{
$this->data = $data;
}
protected function processing(Request $req)
{
if ('get' === $req->verb) {
if (array_key_exists($req->key, $this->data)) {
$req->response = $this->data[$req->key];
return true;
}
}
return false;
}
}