Verzeichnisstruktur phpBB-3.2.0
- Veröffentlicht
- 06.01.2017
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StreamedResponse.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\HttpFoundation;
013
014 /**
015 * StreamedResponse represents a streamed HTTP response.
016 *
017 * A StreamedResponse uses a callback for its content.
018 *
019 * The callback should use the standard PHP functions like echo
020 * to stream the response back to the client. The flush() method
021 * can also be used if needed.
022 *
023 * @see flush()
024 *
025 * @author Fabien Potencier <fabien@symfony.com>
026 */
027 class StreamedResponse extends Response
028 {
029 protected $callback;
030 protected $streamed;
031 private $headersSent;
032
033 /**
034 * Constructor.
035 *
036 * @param callable|null $callback A valid PHP callback or null to set it later
037 * @param int $status The response status code
038 * @param array $headers An array of response headers
039 */
040 public function __construct($callback = null, $status = 200, $headers = array())
041 {
042 parent::__construct(null, $status, $headers);
043
044 if (null !== $callback) {
045 $this->setCallback($callback);
046 }
047 $this->streamed = false;
048 $this->headersSent = false;
049 }
050
051 /**
052 * Factory method for chainability.
053 *
054 * @param callable|null $callback A valid PHP callback or null to set it later
055 * @param int $status The response status code
056 * @param array $headers An array of response headers
057 *
058 * @return StreamedResponse
059 */
060 public static function create($callback = null, $status = 200, $headers = array())
061 {
062 return new static($callback, $status, $headers);
063 }
064
065 /**
066 * Sets the PHP callback associated with this Response.
067 *
068 * @param callable $callback A valid PHP callback
069 *
070 * @throws \LogicException
071 */
072 public function setCallback($callback)
073 {
074 if (!is_callable($callback)) {
075 throw new \LogicException('The Response callback must be a valid PHP callable.');
076 }
077 $this->callback = $callback;
078 }
079
080 /**
081 * {@inheritdoc}
082 *
083 * This method only sends the headers once.
084 */
085 public function sendHeaders()
086 {
087 if ($this->headersSent) {
088 return;
089 }
090
091 $this->headersSent = true;
092
093 parent::sendHeaders();
094 }
095
096 /**
097 * {@inheritdoc}
098 *
099 * This method only sends the content once.
100 */
101 public function sendContent()
102 {
103 if ($this->streamed) {
104 return;
105 }
106
107 $this->streamed = true;
108
109 if (null === $this->callback) {
110 throw new \LogicException('The Response callback must not be null.');
111 }
112
113 call_user_func($this->callback);
114 }
115
116 /**
117 * {@inheritdoc}
118 *
119 * @throws \LogicException when the content is not null
120 */
121 public function setContent($content)
122 {
123 if (null !== $content) {
124 throw new \LogicException('The content cannot be set on a StreamedResponse instance.');
125 }
126 }
127
128 /**
129 * {@inheritdoc}
130 *
131 * @return false
132 */
133 public function getContent()
134 {
135 return false;
136 }
137 }
138