|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
/* |
|
4
|
|
|
* This file is part of the ONGR package. |
|
5
|
|
|
* |
|
6
|
|
|
* (c) NFQ Technologies UAB <[email protected]> |
|
7
|
|
|
* |
|
8
|
|
|
* For the full copyright and license information, please view the LICENSE |
|
9
|
|
|
* file that was distributed with this source code. |
|
10
|
|
|
*/ |
|
11
|
|
|
|
|
12
|
|
|
namespace ONGR\ElasticsearchBundle\Service\Json; |
|
13
|
|
|
|
|
14
|
|
|
/** |
|
15
|
|
|
* Serializes records one by one. Outputs given metadata before first record. |
|
16
|
|
|
* |
|
17
|
|
|
* Sample output: |
|
18
|
|
|
* <p> |
|
19
|
|
|
* [ |
|
20
|
|
|
* {"count":2}, |
|
21
|
|
|
* {"_id":"doc1","title":"Document 1"}, |
|
22
|
|
|
* {"_id":"doc2","title":"Document 2"} |
|
23
|
|
|
* ] |
|
24
|
|
|
* </p> |
|
25
|
|
|
*/ |
|
26
|
|
|
class JsonWriter |
|
27
|
|
|
{ |
|
28
|
|
|
/** |
|
29
|
|
|
* @var string |
|
30
|
|
|
*/ |
|
31
|
|
|
private $filename; |
|
32
|
|
|
|
|
33
|
|
|
/** |
|
34
|
|
|
* @var resource A file system pointer resource. |
|
35
|
|
|
*/ |
|
36
|
|
|
private $handle; |
|
37
|
|
|
|
|
38
|
|
|
/** |
|
39
|
|
|
* @var array |
|
40
|
|
|
*/ |
|
41
|
|
|
private $metadata; |
|
42
|
|
|
|
|
43
|
|
|
/** |
|
44
|
|
|
* @var int Current record number. |
|
45
|
|
|
*/ |
|
46
|
|
|
private $currentPosition = 0; |
|
47
|
|
|
|
|
48
|
|
|
/** |
|
49
|
|
|
* Constructor. |
|
50
|
|
|
* |
|
51
|
|
|
* Metadata can contain any fields but only the field "count" |
|
52
|
|
|
* is recognized and used while writing to file. If written lines count |
|
53
|
|
|
* reaches "count", writer will automatically finalize file. |
|
54
|
|
|
* |
|
55
|
|
|
* @param string $filename A file in which data will be saved. |
|
56
|
|
|
* @param array $metadata Additional metadata to be stored. |
|
57
|
|
|
*/ |
|
58
|
|
|
public function __construct($filename, $metadata = []) |
|
59
|
|
|
{ |
|
60
|
|
|
$this->filename = $filename; |
|
61
|
|
|
$this->metadata = $metadata; |
|
62
|
|
|
} |
|
63
|
|
|
|
|
64
|
|
|
/** |
|
65
|
|
|
* Destructor. Closes file handler if open. |
|
66
|
|
|
*/ |
|
67
|
|
|
public function __destruct() |
|
68
|
|
|
{ |
|
69
|
|
|
$this->finalize(); |
|
70
|
|
|
} |
|
71
|
|
|
|
|
72
|
|
|
/** |
|
73
|
|
|
* Performs initialization. |
|
74
|
|
|
*/ |
|
75
|
|
|
protected function initialize() |
|
76
|
|
|
{ |
|
77
|
|
|
if ($this->handle !== null) { |
|
78
|
|
|
return; |
|
79
|
|
|
} |
|
80
|
|
|
|
|
81
|
|
|
$this->handle = fopen($this->filename, 'w'); |
|
82
|
|
|
fwrite($this->handle, "[\n"); |
|
83
|
|
|
fwrite($this->handle, json_encode($this->metadata)); |
|
84
|
|
|
} |
|
85
|
|
|
|
|
86
|
|
|
/** |
|
87
|
|
|
* Performs finalization. |
|
88
|
|
|
*/ |
|
89
|
|
|
public function finalize() |
|
90
|
|
|
{ |
|
91
|
|
|
$this->initialize(); |
|
92
|
|
|
|
|
93
|
|
|
if (is_resource($this->handle)) { |
|
94
|
|
|
fwrite($this->handle, "\n]"); |
|
95
|
|
|
fclose($this->handle); |
|
96
|
|
|
} |
|
97
|
|
|
} |
|
98
|
|
|
|
|
99
|
|
|
/** |
|
100
|
|
|
* Writes single document to stream. |
|
101
|
|
|
* |
|
102
|
|
|
* @param mixed $document Object to insert into stream. |
|
103
|
|
|
* |
|
104
|
|
|
* @throws \OverflowException |
|
105
|
|
|
*/ |
|
106
|
|
|
public function push($document) |
|
107
|
|
|
{ |
|
108
|
|
|
$this->initialize(); |
|
109
|
|
|
$this->currentPosition++; |
|
110
|
|
|
|
|
111
|
|
|
if (isset($this->metadata['count']) && $this->currentPosition > $this->metadata['count']) { |
|
112
|
|
|
throw new \OverflowException( |
|
113
|
|
|
sprintf('This writer was set up to write %d documents, got more.', $this->metadata['count']) |
|
114
|
|
|
); |
|
115
|
|
|
} |
|
116
|
|
|
|
|
117
|
|
|
fwrite($this->handle, ",\n"); |
|
118
|
|
|
fwrite($this->handle, json_encode($document)); |
|
119
|
|
|
|
|
120
|
|
|
if (isset($this->metadata['count']) && $this->currentPosition == $this->metadata['count']) { |
|
121
|
|
|
$this->finalize(); |
|
122
|
|
|
} |
|
123
|
|
|
} |
|
124
|
|
|
} |
|
125
|
|
|
|
ongr-io /
ElasticsearchBundle
