|
1
|
|
|
<?php |
|
2
|
|
|
/** |
|
3
|
|
|
* Scabbia2 Events Component |
|
4
|
|
|
* https://github.com/eserozvataf/scabbia2 |
|
5
|
|
|
* |
|
6
|
|
|
* For the full copyright and license information, please view the LICENSE |
|
7
|
|
|
* file that was distributed with this source code. |
|
8
|
|
|
* |
|
9
|
|
|
* @link https://github.com/eserozvataf/scabbia2-events for the canonical source repository |
|
10
|
|
|
* @copyright 2010-2016 Eser Ozvataf. (http://eser.ozvataf.com/) |
|
11
|
|
|
* @license http://www.apache.org/licenses/LICENSE-2.0 - Apache License, Version 2.0 |
|
12
|
|
|
*/ |
|
13
|
|
|
|
|
14
|
|
|
namespace Scabbia\Events; |
|
15
|
|
|
|
|
16
|
|
|
/** |
|
17
|
|
|
* Delegate is an inline members which executes an event-chain execution similar to Events, |
|
18
|
|
|
* but designed for object-oriented architecture |
|
19
|
|
|
* |
|
20
|
|
|
* @package Scabbia\Events |
|
21
|
|
|
* @author Eser Ozvataf <[email protected]> |
|
22
|
|
|
* @since 2.0.0 |
|
23
|
|
|
* |
|
24
|
|
|
* @remark SplPriorityQueue could be used, but it doesn't support serialiations. |
|
25
|
|
|
*/ |
|
26
|
|
|
class Delegate |
|
27
|
|
|
{ |
|
28
|
|
|
/** @type array list of callbacks */ |
|
29
|
|
|
public $callbacks = null; |
|
30
|
|
|
/** @type mixed stop propagation if false is returned */ |
|
31
|
|
|
public $stopPropagationWithReturn = true; |
|
32
|
|
|
/** @type bool priorities sorted or not */ |
|
33
|
|
|
private $prioritiesSorted = true; |
|
34
|
|
|
|
|
35
|
|
|
|
|
36
|
|
|
/** |
|
37
|
|
|
* Constructs a new delegate in order to assign it to a member |
|
38
|
|
|
* |
|
39
|
|
|
* @return Delegate a delegate |
|
40
|
|
|
*/ |
|
41
|
|
|
public static function assign() |
|
42
|
|
|
{ |
|
43
|
|
|
$tNewInstance = new static(); |
|
44
|
|
|
|
|
45
|
|
|
return function (/* callable */ $uCallback = null, $uState = null, $uPriority = 10) use ($tNewInstance) { |
|
46
|
|
|
if ($uCallback !== null) { |
|
47
|
|
|
$tNewInstance->subscribe($uCallback, $uState, $uPriority); |
|
48
|
|
|
} |
|
49
|
|
|
|
|
50
|
|
|
return $tNewInstance; |
|
51
|
|
|
}; |
|
52
|
|
|
} |
|
53
|
|
|
|
|
54
|
|
|
// @codingStandardsIgnoreStart |
|
55
|
|
|
/** |
|
56
|
|
|
* Unserializes an instance of delegate |
|
57
|
|
|
* |
|
58
|
|
|
* @param array $uPropertyBag properties set of unserialized object |
|
59
|
|
|
* |
|
60
|
|
|
* @return Delegate a delegate |
|
61
|
|
|
*/ |
|
62
|
|
|
public static function __set_state(array $uPropertyBag) |
|
63
|
|
|
{ |
|
64
|
|
|
$tNewInstance = new static(); |
|
65
|
|
|
$tNewInstance->callbacks = $uPropertyBag["callbacks"]; |
|
66
|
|
|
|
|
67
|
|
|
return $tNewInstance; |
|
68
|
|
|
} |
|
69
|
|
|
// @codingStandardsIgnoreEnd |
|
70
|
|
|
|
|
71
|
|
|
/** |
|
72
|
|
|
* Subscribes a callback to delegate |
|
73
|
|
|
* |
|
74
|
|
|
* @param callback $uCallback callback method |
|
75
|
|
|
* @param mixed $uState state object |
|
76
|
|
|
* @param null|int $uPriority priority level |
|
77
|
|
|
* |
|
78
|
|
|
* @return void |
|
79
|
|
|
*/ |
|
80
|
|
|
public function subscribe(/* callable */ $uCallback, $uState = null, $uPriority = null) |
|
81
|
|
|
{ |
|
82
|
|
|
if ($uPriority === null) { |
|
83
|
|
|
$uPriority = 10; |
|
84
|
|
|
} |
|
85
|
|
|
|
|
86
|
|
|
if ($this->callbacks === null) { |
|
87
|
|
|
$this->callbacks = [[$uCallback, $uState, $uPriority]]; |
|
88
|
|
|
} else { |
|
89
|
|
|
$this->callbacks[] = [$uCallback, $uState, $uPriority]; |
|
90
|
|
|
$this->prioritiesSorted = false; |
|
91
|
|
|
} |
|
92
|
|
|
} |
|
93
|
|
|
|
|
94
|
|
|
/** |
|
95
|
|
|
* Invokes the event-chain execution |
|
96
|
|
|
* |
|
97
|
|
|
* @param array $uParameters execution parameters |
|
98
|
|
|
* |
|
99
|
|
|
* @return bool whether the propagation is stopped or not |
|
100
|
|
|
*/ |
|
101
|
|
|
public function invoke(...$uParameters) |
|
102
|
|
|
{ |
|
103
|
|
|
if ($this->callbacks !== null) { |
|
104
|
|
|
if ($this->prioritiesSorted === false) { |
|
105
|
|
|
usort($this->callbacks, [$this, 'prioritySort']); |
|
106
|
|
|
$this->prioritiesSorted = true; |
|
107
|
|
|
} |
|
108
|
|
|
|
|
109
|
|
|
foreach ($this->callbacks as $tCallback) { |
|
110
|
|
|
if (call_user_func($tCallback[0], ...$uParameters) === false && $this->stopPropagationWithReturn) { |
|
111
|
|
|
return false; |
|
112
|
|
|
} |
|
113
|
|
|
} |
|
114
|
|
|
} |
|
115
|
|
|
|
|
116
|
|
|
return true; |
|
117
|
|
|
} |
|
118
|
|
|
|
|
119
|
|
|
/** |
|
120
|
|
|
* Sorts callbacks in order to their priority |
|
121
|
|
|
* |
|
122
|
|
|
* @param int $uFirst first array item |
|
123
|
|
|
* @param int $uSecond second array item |
|
124
|
|
|
* |
|
125
|
|
|
* @return int comparision result that indicates which item comes first |
|
126
|
|
|
*/ |
|
127
|
|
|
private function prioritySort($uFirst, $uSecond) |
|
128
|
|
|
{ |
|
129
|
|
|
if ($uFirst[2] < $uSecond[2]) { |
|
130
|
|
|
return -1; |
|
131
|
|
|
} |
|
132
|
|
|
|
|
133
|
|
|
if ($uFirst[2] > $uSecond[2]) { |
|
134
|
|
|
return 1; |
|
135
|
|
|
} |
|
136
|
|
|
|
|
137
|
|
|
return 0; |
|
138
|
|
|
} |
|
139
|
|
|
} |
|
140
|
|
|
|