|
1
|
|
|
<?php declare(strict_types=1); |
|
2
|
|
|
|
|
3
|
|
|
namespace Initx\Driver; |
|
4
|
|
|
|
|
5
|
|
|
use Initx\Envelope; |
|
6
|
|
|
use Initx\Exception\IllegalStateException; |
|
7
|
|
|
use Initx\Exception\NoSuchElementException; |
|
8
|
|
|
use Initx\Queue; |
|
9
|
|
|
use JMS\Serializer\SerializerBuilder; |
|
10
|
|
|
use JMS\Serializer\SerializerInterface; |
|
11
|
|
|
use Throwable; |
|
12
|
|
|
|
|
13
|
|
|
final class FilesystemQueue implements Queue |
|
14
|
|
|
{ |
|
15
|
|
|
/** |
|
16
|
|
|
* @var string |
|
17
|
|
|
*/ |
|
18
|
|
|
private $path; |
|
19
|
|
|
|
|
20
|
|
|
/** |
|
21
|
|
|
* @var SerializerInterface |
|
22
|
|
|
*/ |
|
23
|
|
|
private $serializer; |
|
24
|
|
|
|
|
25
|
11 |
|
public function __construct(string $path, SerializerInterface $serializer = null) |
|
26
|
|
|
{ |
|
27
|
11 |
|
if (!$serializer) { |
|
28
|
11 |
|
$separator = DIRECTORY_SEPARATOR; |
|
29
|
11 |
|
$metaDir = sprintf('%s%s..%s..%sconfig%sjms', __DIR__, $separator, $separator, $separator, $separator); |
|
30
|
11 |
|
$serializer = SerializerBuilder::create() |
|
31
|
11 |
|
->addMetadataDir($metaDir, 'Initx') |
|
32
|
11 |
|
->build(); |
|
33
|
|
|
} |
|
34
|
11 |
|
$this->serializer = $serializer; |
|
35
|
11 |
|
$this->path = $path; |
|
36
|
11 |
|
} |
|
37
|
|
|
|
|
38
|
|
|
/** |
|
39
|
|
|
* Inserts an element if possible, otherwise throwing exception. |
|
40
|
|
|
* |
|
41
|
|
|
* @param Envelope $envelope |
|
42
|
|
|
* @return void |
|
43
|
|
|
* @throws IllegalStateException |
|
44
|
|
|
*/ |
|
45
|
5 |
|
public function add(Envelope $envelope): void |
|
46
|
|
|
{ |
|
47
|
5 |
|
if (!$this->write($envelope)) { |
|
48
|
1 |
|
throw IllegalStateException::create("Could not write to {$this->path}"); |
|
49
|
|
|
} |
|
50
|
4 |
|
} |
|
51
|
|
|
|
|
52
|
|
|
/** |
|
53
|
|
|
* Inserts an element if possible. |
|
54
|
|
|
* |
|
55
|
|
|
* @param Envelope $envelope |
|
56
|
|
|
* @return void |
|
57
|
|
|
*/ |
|
58
|
2 |
|
public function offer(Envelope $envelope): void |
|
59
|
|
|
{ |
|
60
|
2 |
|
$this->write($envelope); |
|
61
|
2 |
|
} |
|
62
|
|
|
|
|
63
|
7 |
|
private function write(Envelope $envelope): bool |
|
64
|
|
|
{ |
|
65
|
7 |
|
$content = $this->serializer->serialize($envelope, 'json') . PHP_EOL; |
|
66
|
|
|
try { |
|
67
|
7 |
|
$result = (bool)file_put_contents( |
|
68
|
7 |
|
$this->path, |
|
69
|
7 |
|
$content, |
|
70
|
7 |
|
FILE_APPEND |
|
71
|
|
|
); |
|
72
|
2 |
|
} catch (Throwable $exception) { |
|
73
|
2 |
|
$result = false; |
|
74
|
|
|
} |
|
75
|
|
|
|
|
76
|
7 |
|
return $result; |
|
77
|
|
|
} |
|
78
|
|
|
|
|
79
|
|
|
/** |
|
80
|
|
|
* Remove and return head of queue, otherwise throwing exception. |
|
81
|
|
|
* |
|
82
|
|
|
* @return Envelope |
|
83
|
|
|
* @throws NoSuchElementException | IllegalStateException |
|
84
|
|
|
*/ |
|
85
|
3 |
|
public function remove(): Envelope |
|
86
|
|
|
{ |
|
87
|
3 |
|
if (!$envelope = $this->poll()) { |
|
88
|
1 |
|
throw new NoSuchElementException('Queue empty'); |
|
89
|
|
|
} |
|
90
|
|
|
|
|
91
|
1 |
|
return $envelope; |
|
92
|
|
|
} |
|
93
|
|
|
|
|
94
|
3 |
|
private function removeFirstLine(): ?string |
|
95
|
|
|
{ |
|
96
|
3 |
|
if (!file_exists($this->path)) { |
|
97
|
1 |
|
throw new IllegalStateException("File $this->path not exists"); |
|
98
|
|
|
} |
|
99
|
2 |
|
$firstLine = null; |
|
100
|
2 |
|
if ($handle = fopen($this->path, 'cb+')) { |
|
101
|
2 |
|
if (!flock($handle, LOCK_EX)) { |
|
102
|
|
|
fclose($handle); |
|
103
|
|
|
} |
|
104
|
2 |
|
$offset = 0; |
|
105
|
2 |
|
$len = filesize($this->path); |
|
106
|
2 |
|
while (($line = fgets($handle, 4096)) !== false) { |
|
107
|
1 |
|
if (!$firstLine) { |
|
108
|
1 |
|
$firstLine = $line; |
|
109
|
1 |
|
$offset = strlen($firstLine); |
|
110
|
1 |
|
continue; |
|
111
|
|
|
} |
|
112
|
1 |
|
$pos = ftell($handle); |
|
113
|
1 |
|
fseek($handle, $pos - strlen($line) - $offset); |
|
114
|
1 |
|
fwrite($handle, $line); |
|
115
|
1 |
|
fseek($handle, $pos); |
|
116
|
|
|
} |
|
117
|
2 |
|
fflush($handle); |
|
118
|
2 |
|
ftruncate($handle, $len - $offset); |
|
119
|
2 |
|
flock($handle, LOCK_UN); |
|
120
|
2 |
|
fclose($handle); |
|
121
|
|
|
} |
|
122
|
|
|
|
|
123
|
2 |
|
return $firstLine; |
|
124
|
|
|
} |
|
125
|
|
|
|
|
126
|
4 |
|
private function readFirstLine(): ?string |
|
127
|
|
|
{ |
|
128
|
4 |
|
if (!file_exists($this->path)) { |
|
129
|
|
|
throw new IllegalStateException("File $this->path not exists"); |
|
130
|
|
|
} |
|
131
|
|
|
|
|
132
|
4 |
|
$firstLine = fgets(fopen($this->path, 'rb')); |
|
|
|
|
|
|
133
|
|
|
|
|
134
|
4 |
|
return $firstLine ?: null; |
|
135
|
|
|
} |
|
136
|
|
|
|
|
137
|
|
|
/** |
|
138
|
|
|
* Remove and return head of queue, otherwise returning null. |
|
139
|
|
|
* |
|
140
|
|
|
* @return Envelope | null |
|
141
|
|
|
* @throws IllegalStateException |
|
142
|
|
|
*/ |
|
143
|
3 |
|
public function poll(): ?Envelope |
|
144
|
|
|
{ |
|
145
|
3 |
|
$firstLine = $this->removeFirstLine(); |
|
146
|
|
|
|
|
147
|
2 |
|
if (!$firstLine) { |
|
148
|
1 |
|
return null; |
|
149
|
|
|
} |
|
150
|
|
|
|
|
151
|
1 |
|
return $this->serializer->deserialize($firstLine, Envelope::class, 'json'); |
|
152
|
|
|
} |
|
153
|
|
|
|
|
154
|
|
|
/** |
|
155
|
|
|
* Return but do not remove head of queue, otherwise throwing exception. |
|
156
|
|
|
* |
|
157
|
|
|
* @return Envelope |
|
158
|
|
|
* @throws NoSuchElementException | IllegalStateException |
|
159
|
|
|
*/ |
|
160
|
2 |
|
public function element(): Envelope |
|
161
|
|
|
{ |
|
162
|
2 |
|
if (!$envelope = $this->peek()) { |
|
163
|
1 |
|
throw new NoSuchElementException('Queue empty'); |
|
164
|
|
|
} |
|
165
|
|
|
|
|
166
|
1 |
|
return $envelope; |
|
167
|
|
|
} |
|
168
|
|
|
|
|
169
|
|
|
/** |
|
170
|
|
|
* Return but do not remove head of queue, otherwise returning null. |
|
171
|
|
|
* |
|
172
|
|
|
* @return Envelope | null |
|
173
|
|
|
* @throws IllegalStateException |
|
174
|
|
|
*/ |
|
175
|
4 |
|
public function peek(): ?Envelope |
|
176
|
|
|
{ |
|
177
|
4 |
|
$firstLine = $this->readFirstLine(); |
|
178
|
|
|
|
|
179
|
4 |
|
if (!$firstLine) { |
|
180
|
2 |
|
return null; |
|
181
|
|
|
} |
|
182
|
|
|
|
|
183
|
2 |
|
return $this->serializer->deserialize($firstLine, Envelope::class, 'json'); |
|
184
|
|
|
} |
|
185
|
|
|
} |
|
186
|
|
|
|
initx /
querabilis
Loading history...