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PHP design pattern command chain pattern_PHP tutorial
- WBOYOriginal
- 2016-07-13 09:54:201016browse
php design pattern command chain mode
Command chain mode:
The chain of command pattern is based on loosely coupled topics, sending messages, commands and requests, or sending arbitrary content through a set of handlers. Each handler makes its own judgment about whether it can handle the request. If it can, the request is processed and the process stops. You can add or remove handlers from the system without affecting other handlers.
1.interface Validator
2.{
3. /**
4. * The method could have any parameters.
5. * @param mixed
6. * @return boolean
7.*/
8. public function isValid($value);
9.}
10.
11./**
12. * ConcreteCommand.
13.*/
14.class MoreThanZeroValidator implements Validator
15.{
16. public function isValid($value)
17. {
18. return $value > 0;
19. }
20.}
21.
22./**
23. * ConcreteCommand.
24.*/
25.class EvenValidator implements Validator
26.{
27. public function isValid($value)
28. {
29. return $value % 2 == 0;
30. }
31.}
32.
33./**
34. * The Invoker. An implementation could store more than one
35. * Validator if needed.
36.*/
37.class ArrayProcessor
38.{
39. protected $_rule;
40.
41. public function __construct (Validator $rule)
42. {
43. $this->_rule = $rule;
44. }
45.
46. public function process(array $numbers)
47. {
48. foreach ($numbers as $n) {
49. if ($this->_rule->IsValid($n)) {
50. echo $n, "n";
51. }
52. }
53. }
54.}
55.
56.// Client code
57.$processor = new ArrayProcessor(new EvenValidator());
58.$processor->process(array(1, 20, 18, 5, 0, 31, 42));