1: <?php
 2: 
 3: class AtomicOperation {
 4: 
 5:     private $operations = array();
 6: 
 7:     public function add(UndoableOperation $operation) {
 8:         $this->operations[] = $operation;
 9:     }
10: 
11:     public function run() {
12:         $executed = array();
13:         $error = null;
14: 
15:         foreach ($this->operations as $operation) {
16:             try {
17:                 if ($operation->run()) {
18:                     array_unshift($executed, $operation);
19:                 } else {
20:                     $error = $operation;
21:                     break;
22:                 }
23:             } catch (Exception $ex) {
24:                 $error = $operation;
25:                 break;
26:             }
27:         }
28: 
29:         if ($error != null) {
30:             foreach ($executed as $operation) {
31:                 try {
32:                     $operation->undo();
33:                 } catch (Exception $ex) {
34:                     //Ignores fail
35:                 }
36:             }
37:             throw new Exception("Error on execute operation \"$error\"");
38:         }
39: 
40:         foreach ($this->operations as $operation) {
41:             if ($operation instanceof CommitableOperation) {
42:                 try {
43:                     $operation->commit();
44:                 } catch (Exception $ex) {
45:                     //Ignores fail
46:                 }
47:             }
48:         }
49:     }
50: 
51:     public function __toString() {
52:         $b = '';
53:         foreach ($this->operations as $operation) {
54:             $b .= "$operation\n";
55:         }
56:         return $b;
57:     }
58: 
59: }