本文实例讲述了Zend Framework教程之分发器Zend_Controller_Dispatcher用法。分享给大家供大家参考，具体如下：
分发器的具体实现
Zend Framework的分发器Zend_Controller_Dispatcher设计主要有，如下类和接口组成：
├── Dispatcher
│ ├── Abstract.php
│ ├── Exception.php
│ ├── Interface.php
│ └── Standard.php
Zend_Controller_Dispatcher_Interface
定义了分发器提供的基本和标准功能。
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
|
interface Zend_Controller_Dispatcher_Interface{ public function formatControllerName($unformatted); public function formatModuleName($unformatted); public function formatActionName($unformatted); public function isDispatchable(Zend_Controller_Request_Abstract $request); public function setParam($name, $value); public function setParams(array $params); public function getParam($name); public function getParams(); public function clearParams($name = null); public function setResponse(Zend_Controller_Response_Abstract $response = null); public function getResponse(); public function addControllerDirectory($path, $args = null); public function setControllerDirectory($path); public function getControllerDirectory(); public function dispatch(Zend_Controller_Request_Abstract $request, Zend_Controller_Response_Abstract $response); public function isValidModule($module); public function getDefaultModule(); public function getDefaultControllerName(); public function getDefaultAction();} |
Zend_Controller_Dispatcher_Abstract
实现了Zend_Controller_Dispatcher_Interface接口，提供了分发器提供的基本和标准功能的抽象父类。
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
<?php/** Zend_Controller_Dispatcher_Interface */require_once 'Zend/Controller/Dispatcher/Interface.php';abstract class Zend_Controller_Dispatcher_Abstract implements Zend_Controller_Dispatcher_Interface{ protected $_defaultAction = 'index'; protected $_defaultController = 'index'; protected $_defaultModule = 'default'; protected $_frontController; protected $_invokeParams = array(); protected $_pathDelimiter = '_'; protected $_response = null; protected $_wordDelimiter = array('-', '.'); public function __construct(array $params = array()) { $this->setParams($params); } public function formatControllerName($unformatted) { return ucfirst($this->_formatName($unformatted)) . 'Controller'; } public function formatActionName($unformatted) { $formatted = $this->_formatName($unformatted, true); return strtolower(substr($formatted, 0, 1)) . substr($formatted, 1) . 'Action'; } public function _verifyDelimiter($spec) { if (is_string($spec)) { return (array) $spec; } elseif (is_array($spec)) { $allStrings = true; foreach ($spec as $delim) { if (!is_string($delim)) { $allStrings = false; break; } } if (!$allStrings) { require_once 'Zend/Controller/Dispatcher/Exception.php'; throw new Zend_Controller_Dispatcher_Exception('Word delimiter array must contain only strings'); } return $spec; } require_once 'Zend/Controller/Dispatcher/Exception.php'; throw new Zend_Controller_Dispatcher_Exception('Invalid word delimiter'); } public function getWordDelimiter() { return $this->_wordDelimiter; } public function setWordDelimiter($spec) { $spec = $this->_verifyDelimiter($spec); $this->_wordDelimiter = $spec; return $this; } public function getPathDelimiter() { return $this->_pathDelimiter; } public function setPathDelimiter($spec) { if (!is_string($spec)) { require_once 'Zend/Controller/Dispatcher/Exception.php'; throw new Zend_Controller_Dispatcher_Exception('Invalid path delimiter'); } $this->_pathDelimiter = $spec; return $this; } protected function _formatName($unformatted, $isAction = false) { // preserve directories if (!$isAction) { $segments = explode($this->getPathDelimiter(), $unformatted); } else { $segments = (array) $unformatted; } foreach ($segments as $key => $segment) { $segment = str_replace($this->getWordDelimiter(), ' ', strtolower($segment)); $segment = preg_replace('/[^a-z0-9 ]/', '', $segment); $segments[$key] = str_replace(' ', '', ucwords($segment)); } return implode('_', $segments); } public function getFrontController() { if (null === $this->_frontController) { require_once 'Zend/Controller/Front.php'; $this->_frontController = Zend_Controller_Front::getInstance(); } return $this->_frontController; } public function setFrontController(Zend_Controller_Front $controller) { $this->_frontController = $controller; return $this; } public function setParam($name, $value) { $name = (string) $name; $this->_invokeParams[$name] = $value; return $this; } public function setParams(array $params) { $this->_invokeParams = array_merge($this->_invokeParams, $params); return $this; } public function getParam($name) { if(isset($this->_invokeParams[$name])) { return $this->_invokeParams[$name]; } return null; } public function getParams() { return $this->_invokeParams; } public function clearParams($name = null) { if (null === $name) { $this->_invokeParams = array(); } elseif (is_string($name) && isset($this->_invokeParams[$name])) { unset($this->_invokeParams[$name]); } elseif (is_array($name)) { foreach ($name as $key) { if (is_string($key) && isset($this->_invokeParams[$key])) { unset($this->_invokeParams[$key]); } } } return $this; } public function setResponse(Zend_Controller_Response_Abstract $response = null) { $this->_response = $response; return $this; } public function getResponse() { return $this->_response; } public function setDefaultControllerName($controller) { $this->_defaultController = (string) $controller; return $this; } public function getDefaultControllerName() { return $this->_defaultController; } public function setDefaultAction($action) { $this->_defaultAction = (string) $action; return $this; } public function getDefaultAction() { return $this->_defaultAction; } public function setDefaultModule($module) { $this->_defaultModule = (string) $module; return $this; } public function getDefaultModule() { return $this->_defaultModule; }} |
Zend_Controller_Dispatcher_Standard
ZendFramework继承抽象类Zend_Controller_Dispatcher_Abstract，定义了Zend_Controller_Dispatcher_Standard。Zend_Controller_Dispatcher_Standard是ZendFramework提供的基本的分发器，完成了分发功能。
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
|
<?php/** Zend_Loader */require_once 'Zend/Loader.php';/** Zend_Controller_Dispatcher_Abstract */require_once 'Zend/Controller/Dispatcher/Abstract.php';class Zend_Controller_Dispatcher_Standard extends Zend_Controller_Dispatcher_Abstract{ protected $_curDirectory; protected $_curModule; protected $_controllerDirectory = array(); public function __construct(array $params = array()) { parent::__construct($params); $this->_curModule = $this->getDefaultModule(); } public function addControllerDirectory($path, $module = null) { if (null === $module) { $module = $this->_defaultModule; } $module = (string) $module; $path = rtrim((string) $path, '/\\'); $this->_controllerDirectory[$module] = $path; return $this; } public function setControllerDirectory($directory, $module = null) { $this->_controllerDirectory = array(); if (is_string($directory)) { $this->addControllerDirectory($directory, $module); } elseif (is_array($directory)) { foreach ((array) $directory as $module => $path) { $this->addControllerDirectory($path, $module); } } else { require_once 'Zend/Controller/Exception.php'; throw new Zend_Controller_Exception('Controller directory spec must be either a string or an array'); } return $this; } public function getControllerDirectory($module = null) { if (null === $module) { return $this->_controllerDirectory; } $module = (string) $module; if (array_key_exists($module, $this->_controllerDirectory)) { return $this->_controllerDirectory[$module]; } return null; } public function removeControllerDirectory($module) { $module = (string) $module; if (array_key_exists($module, $this->_controllerDirectory)) { unset($this->_controllerDirectory[$module]); return true; } return false; } public function formatModuleName($unformatted) { if (($this->_defaultModule == $unformatted) && !$this->getParam('prefixDefaultModule')) { return $unformatted; } return ucfirst($this->_formatName($unformatted)); } public function formatClassName($moduleName, $className) { return $this->formatModuleName($moduleName) . '_' . $className; } public function classToFilename($class) { return str_replace('_', DIRECTORY_SEPARATOR, $class) . '.php'; } public function isDispatchable(Zend_Controller_Request_Abstract $request) { $className = $this->getControllerClass($request); if (!$className) { return false; } $finalClass = $className; if (($this->_defaultModule != $this->_curModule) || $this->getParam('prefixDefaultModule')) { $finalClass = $this->formatClassName($this->_curModule, $className); } if (class_exists($finalClass, false)) { return true; } $fileSpec = $this->classToFilename($className); $dispatchDir = $this->getDispatchDirectory(); $test = $dispatchDir . DIRECTORY_SEPARATOR . $fileSpec; return Zend_Loader::isReadable($test); } public function dispatch(Zend_Controller_Request_Abstract $request, Zend_Controller_Response_Abstract $response) { $this->setResponse($response); /** * Get controller class */ if (!$this->isDispatchable($request)) { $controller = $request->getControllerName(); if (!$this->getParam('useDefaultControllerAlways') && !empty($controller)) { require_once 'Zend/Controller/Dispatcher/Exception.php'; throw new Zend_Controller_Dispatcher_Exception('Invalid controller specified (' . $request->getControllerName() . ')'); } $className = $this->getDefaultControllerClass($request); } else { $className = $this->getControllerClass($request); if (!$className) { $className = $this->getDefaultControllerClass($request); } } /** * Load the controller class file */ $className = $this->loadClass($className); /** * Instantiate controller with request, response, and invocation * arguments; throw exception if it's not an action controller */ $controller = new $className($request, $this->getResponse(), $this->getParams()); if (!($controller instanceof Zend_Controller_Action_Interface) && !($controller instanceof Zend_Controller_Action)) { require_once 'Zend/Controller/Dispatcher/Exception.php'; throw new Zend_Controller_Dispatcher_Exception( 'Controller "' . $className . '" is not an instance of Zend_Controller_Action_Interface' ); } /** * Retrieve the action name */ $action = $this->getActionMethod($request); /** * Dispatch the method call */ $request->setDispatched(true); // by default, buffer output $disableOb = $this->getParam('disableOutputBuffering'); $obLevel = ob_get_level(); if (empty($disableOb)) { ob_start(); } try { $controller->dispatch($action); } catch (Exception $e) { // Clean output buffer on error $curObLevel = ob_get_level(); if ($curObLevel > $obLevel) { do { ob_get_clean(); $curObLevel = ob_get_level(); } while ($curObLevel > $obLevel); } throw $e; } if (empty($disableOb)) { $content = ob_get_clean(); $response->appendBody($content); } // Destroy the page controller instance and reflection objects $controller = null; } public function loadClass($className) { $finalClass = $className; if (($this->_defaultModule != $this->_curModule) || $this->getParam('prefixDefaultModule')) { $finalClass = $this->formatClassName($this->_curModule, $className); } if (class_exists($finalClass, false)) { return $finalClass; } $dispatchDir = $this->getDispatchDirectory(); $loadFile = $dispatchDir . DIRECTORY_SEPARATOR . $this->classToFilename($className); if (Zend_Loader::isReadable($loadFile)) { include_once $loadFile; } else { require_once 'Zend/Controller/Dispatcher/Exception.php'; throw new Zend_Controller_Dispatcher_Exception('Cannot load controller class "' . $className . '" from file "' . $loadFile . "'"); } if (!class_exists($finalClass, false)) { require_once 'Zend/Controller/Dispatcher/Exception.php'; throw new Zend_Controller_Dispatcher_Exception('Invalid controller class ("' . $finalClass . '")'); } return $finalClass; } public function getControllerClass(Zend_Controller_Request_Abstract $request) { $controllerName = $request->getControllerName(); if (empty($controllerName)) { if (!$this->getParam('useDefaultControllerAlways')) { return false; } $controllerName = $this->getDefaultControllerName(); $request->setControllerName($controllerName); } $className = $this->formatControllerName($controllerName); $controllerDirs = $this->getControllerDirectory(); $module = $request->getModuleName(); if ($this->isValidModule($module)) { $this->_curModule = $module; $this->_curDirectory = $controllerDirs[$module]; } elseif ($this->isValidModule($this->_defaultModule)) { $request->setModuleName($this->_defaultModule); $this->_curModule = $this->_defaultModule; $this->_curDirectory = $controllerDirs[$this->_defaultModule]; } else { require_once 'Zend/Controller/Exception.php'; throw new Zend_Controller_Exception('No default module defined for this application'); } return $className; } public function isValidModule($module) { if (!is_string($module)) { return false; } $module = strtolower($module); $controllerDir = $this->getControllerDirectory(); foreach (array_keys($controllerDir) as $moduleName) { if ($module == strtolower($moduleName)) { return true; } } return false; } public function getDefaultControllerClass(Zend_Controller_Request_Abstract $request) { $controller = $this->getDefaultControllerName(); $default = $this->formatControllerName($controller); $request->setControllerName($controller) ->setActionName(null); $module = $request->getModuleName(); $controllerDirs = $this->getControllerDirectory(); $this->_curModule = $this->_defaultModule; $this->_curDirectory = $controllerDirs[$this->_defaultModule]; if ($this->isValidModule($module)) { $found = false; if (class_exists($default, false)) { $found = true; } else { $moduleDir = $controllerDirs[$module]; $fileSpec = $moduleDir . DIRECTORY_SEPARATOR . $this->classToFilename($default); if (Zend_Loader::isReadable($fileSpec)) { $found = true; $this->_curDirectory = $moduleDir; } } if ($found) { $request->setModuleName($module); $this->_curModule = $this->formatModuleName($module); } } else { $request->setModuleName($this->_defaultModule); } return $default; } public function getDispatchDirectory() { return $this->_curDirectory; } public function getActionMethod(Zend_Controller_Request_Abstract $request) { $action = $request->getActionName(); if (empty($action)) { $action = $this->getDefaultAction(); $request->setActionName($action); } return $this->formatActionName($action); }} |
前端控制器和分发器
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
|
<?php/** Zend_Loader */require_once 'Zend/Loader.php';/** Zend_Controller_Action_HelperBroker */require_once 'Zend/Controller/Action/HelperBroker.php';/** Zend_Controller_Plugin_Broker */require_once 'Zend/Controller/Plugin/Broker.php';class Zend_Controller_Front{ protected $_baseUrl = null; protected $_controllerDir = null; protected $_dispatcher = null; protected static $_instance = null; protected $_invokeParams = array(); protected $_moduleControllerDirectoryName = 'controllers'; protected $_plugins = null; protected $_request = null; protected $_response = null; protected $_returnResponse = false; protected $_router = null; protected $_throwExceptions = false; protected function __construct() { $this->_plugins = new Zend_Controller_Plugin_Broker(); } private function __clone() { } public static function getInstance() { if (null === self::$_instance) { self::$_instance = new self(); } return self::$_instance; } public function resetInstance() { $reflection = new ReflectionObject($this); foreach ($reflection->getProperties() as $property) { $name = $property->getName(); switch ($name) { case '_instance': break; case '_controllerDir': case '_invokeParams': $this->{$name} = array(); break; case '_plugins': $this->{$name} = new Zend_Controller_Plugin_Broker(); break; case '_throwExceptions': case '_returnResponse': $this->{$name} = false; break; case '_moduleControllerDirectoryName': $this->{$name} = 'controllers'; break; default: $this->{$name} = null; break; } } Zend_Controller_Action_HelperBroker::resetHelpers(); } public static function run($controllerDirectory) { self::getInstance() ->setControllerDirectory($controllerDirectory) ->dispatch(); } public function addControllerDirectory($directory, $module = null) { $this->getDispatcher()->addControllerDirectory($directory, $module); return $this; } public function setControllerDirectory($directory, $module = null) { $this->getDispatcher()->setControllerDirectory($directory, $module); return $this; } public function getControllerDirectory($name = null) { return $this->getDispatcher()->getControllerDirectory($name); } public function removeControllerDirectory($module) { return $this->getDispatcher()->removeControllerDirectory($module); } public function addModuleDirectory($path) { try{ $dir = new DirectoryIterator($path); } catch(Exception $e) { require_once 'Zend/Controller/Exception.php'; throw new Zend_Controller_Exception("Directory $path not readable", 0, $e); } foreach ($dir as $file) { if ($file->isDot() || !$file->isDir()) { continue; } $module = $file->getFilename(); // Don't use SCCS directories as modules if (preg_match('/^[^a-z]/i', $module) || ('CVS' == $module)) { continue; } $moduleDir = $file->getPathname() . DIRECTORY_SEPARATOR . $this->getModuleControllerDirectoryName(); $this->addControllerDirectory($moduleDir, $module); } return $this; } public function getModuleDirectory($module = null) { if (null === $module) { $request = $this->getRequest(); if (null !== $request) { $module = $this->getRequest()->getModuleName(); } if (empty($module)) { $module = $this->getDispatcher()->getDefaultModule(); } } $controllerDir = $this->getControllerDirectory($module); if ((null === $controllerDir) || !is_string($controllerDir)) { return null; } return dirname($controllerDir); } public function setModuleControllerDirectoryName($name = 'controllers') { $this->_moduleControllerDirectoryName = (string) $name; return $this; } public function getModuleControllerDirectoryName() { return $this->_moduleControllerDirectoryName; } public function setDefaultControllerName($controller) { $dispatcher = $this->getDispatcher(); $dispatcher->setDefaultControllerName($controller); return $this; } public function getDefaultControllerName() { return $this->getDispatcher()->getDefaultControllerName(); } public function setDefaultAction($action) { $dispatcher = $this->getDispatcher(); $dispatcher->setDefaultAction($action); return $this; } public function getDefaultAction() { return $this->getDispatcher()->getDefaultAction(); } public function setDefaultModule($module) { $dispatcher = $this->getDispatcher(); $dispatcher->setDefaultModule($module); return $this; } public function getDefaultModule() { return $this->getDispatcher()->getDefaultModule(); } public function setRequest($request) { ........................... return $this; } public function getRequest() { return $this->_request; } public function setRouter($router) { .................... return $this; } public function getRouter() { .................. return $this->_router; } public function setBaseUrl($base = null) { .............. return $this; } public function getBaseUrl() { return $this->_baseUrl; } /** * Set the dispatcher object. The dispatcher is responsible for * taking a Zend_Controller_Dispatcher_Token object, instantiating the controller, and * call the action method of the controller. * * @param Zend_Controller_Dispatcher_Interface $dispatcher * @return Zend_Controller_Front */ public function setDispatcher(Zend_Controller_Dispatcher_Interface $dispatcher) { $this->_dispatcher = $dispatcher; return $this; } /** * Return the dispatcher object. * * @return Zend_Controller_Dispatcher_Interface */ public function getDispatcher() { /** * Instantiate the default dispatcher if one was not set. */ if (!$this->_dispatcher instanceof Zend_Controller_Dispatcher_Interface) { require_once 'Zend/Controller/Dispatcher/Standard.php'; $this->_dispatcher = new Zend_Controller_Dispatcher_Standard(); } return $this->_dispatcher; } public function setResponse($response) {.................. return $this; } public function getResponse() { return $this->_response; } public function setParam($name, $value) { $name = (string) $name; $this->_invokeParams[$name] = $value; return $this; } public function setParams(array $params) { $this->_invokeParams = array_merge($this->_invokeParams, $params); return $this; } public function getParam($name) { if(isset($this->_invokeParams[$name])) { return $this->_invokeParams[$name]; } return null; } public function getParams() { return $this->_invokeParams; } public function clearParams($name = null) { if (null === $name) { $this->_invokeParams = array(); } elseif (is_string($name) && isset($this->_invokeParams[$name])) { unset($this->_invokeParams[$name]); } elseif (is_array($name)) { foreach ($name as $key) { if (is_string($key) && isset($this->_invokeParams[$key])) { unset($this->_invokeParams[$key]); } } } return $this; } public function registerPlugin(Zend_Controller_Plugin_Abstract $plugin, $stackIndex = null) { $this->_plugins->registerPlugin($plugin, $stackIndex); return $this; } public function unregisterPlugin($plugin) { $this->_plugins->unregisterPlugin($plugin); return $this; } public function hasPlugin($class) { return $this->_plugins->hasPlugin($class); } public function getPlugin($class) { return $this->_plugins->getPlugin($class); } public function getPlugins() { return $this->_plugins->getPlugins(); } public function throwExceptions($flag = null) { ..................... return $this->_throwExceptions; } public function returnResponse($flag = null) { ................ return $this->_returnResponse; } /** * Dispatch an HTTP request to a controller/action. * * @param Zend_Controller_Request_Abstract|null $request * @param Zend_Controller_Response_Abstract|null $response * @return void|Zend_Controller_Response_Abstract Returns response object if returnResponse() is true */ public function dispatch(Zend_Controller_Request_Abstract $request = null, Zend_Controller_Response_Abstract $response = null) { if (!$this->getParam('noErrorHandler') && !$this->_plugins->hasPlugin('Zend_Controller_Plugin_ErrorHandler')) { // Register with stack index of 100 require_once 'Zend/Controller/Plugin/ErrorHandler.php'; $this->_plugins->registerPlugin(new Zend_Controller_Plugin_ErrorHandler(), 100); } if (!$this->getParam('noViewRenderer') && !Zend_Controller_Action_HelperBroker::hasHelper('viewRenderer')) { require_once 'Zend/Controller/Action/Helper/ViewRenderer.php'; Zend_Controller_Action_HelperBroker::getStack()->offsetSet(-80, new Zend_Controller_Action_Helper_ViewRenderer()); } /** * Instantiate default request object (HTTP version) if none provided */ if (null !== $request) { $this->setRequest($request); } elseif ((null === $request) && (null === ($request = $this->getRequest()))) { require_once 'Zend/Controller/Request/Http.php'; $request = new Zend_Controller_Request_Http(); $this->setRequest($request); } /** * Set base URL of request object, if available */ if (is_callable(array($this->_request, 'setBaseUrl'))) { if (null !== $this->_baseUrl) { $this->_request->setBaseUrl($this->_baseUrl); } } /** * Instantiate default response object (HTTP version) if none provided */ if (null !== $response) { $this->setResponse($response); } elseif ((null === $this->_response) && (null === ($this->_response = $this->getResponse()))) { require_once 'Zend/Controller/Response/Http.php'; $response = new Zend_Controller_Response_Http(); $this->setResponse($response); } /** * Register request and response objects with plugin broker */ $this->_plugins ->setRequest($this->_request) ->setResponse($this->_response); /** * Initialize router */ $router = $this->getRouter(); $router->setParams($this->getParams()); /** * Initialize dispatcher */ $dispatcher = $this->getDispatcher(); $dispatcher->setParams($this->getParams()) ->setResponse($this->_response); // Begin dispatch try { /** * Route request to controller/action, if a router is provided */ /** * Notify plugins of router startup */ $this->_plugins->routeStartup($this->_request); try { $router->route($this->_request); } catch (Exception $e) { if ($this->throwExceptions()) { throw $e; } $this->_response->setException($e); } /** * Notify plugins of router completion */ $this->_plugins->routeShutdown($this->_request); /** * Notify plugins of dispatch loop startup */ $this->_plugins->dispatchLoopStartup($this->_request); /** * Attempt to dispatch the controller/action. If the $this->_request * indicates that it needs to be dispatched, move to the next * action in the request. */ do { $this->_request->setDispatched(true); /** * Notify plugins of dispatch startup */ $this->_plugins->preDispatch($this->_request); /** * Skip requested action if preDispatch() has reset it */ if (!$this->_request->isDispatched()) { continue; } /** * Dispatch request */ try { $dispatcher->dispatch($this->_request, $this->_response); } catch (Exception $e) { if ($this->throwExceptions()) { throw $e; } $this->_response->setException($e); } /** * Notify plugins of dispatch completion */ $this->_plugins->postDispatch($this->_request); } while (!$this->_request->isDispatched()); } catch (Exception $e) { if ($this->throwExceptions()) { throw $e; } $this->_response->setException($e); } /** * Notify plugins of dispatch loop completion */ try { $this->_plugins->dispatchLoopShutdown(); } catch (Exception $e) { if ($this->throwExceptions()) { throw $e; } $this->_response->setException($e); } if ($this->returnResponse()) { return $this->_response; } $this->_response->sendResponse(); }} |
以上对Zend_Controller_Front和Zend_Controller_Dispatcher做了简单的标记，通过分析代码不难看出，基本的运行机制。
分发发生在前端控制器中的一个循环（loop）中。分发之前，前端控制器通过路由请求，找到用户指定的模块、控制器、动作和可选参数。然后进入分发循环，分发请求。
分发器需要大量数据完成任务——它需要知道如何格式化控制器和动作的名称，到哪儿找到控制器类文件，模块名是否有效，以及基于其它可用信息判定请求是否能分发的API。
每次迭代（iteration）过程开始时，在请求对象中设置一个标志指示该动作已分发。如果在动作或者前/后分发（pre/postDispatch）插件重置了该标志，分发循环将继续下去并试图分发新的请求。通过改变请求中的控制器或者动作并重置已分发标志，开发人员可以定制执行一个请求链。
控制这种分发过程的动作控制器方法是_forward()；在任意的pre/postDispatch()或者动作中调用该方法，并传入动作、控制器、模块、以及可选的附加参数，就可以进入新的动作。
自定义分发器
Zend_Controller_Dispatcher_Interface定义了下列所有分发器需要实现的方法。
不过大多数情况下，只需要简单地扩展抽象类Zend_Controller_Dispatcher_Abstract，其中已经定义好了上面的大部分方法。或者扩展Zend_Controller_Dispatcher_Standard类，基于标准分发器来修改功能。
需要子类化分发器的可能原因包括：期望在动作控制器中使用不同的类和方法命名模式，或者期望使用不同的分发方式，比如分发到控制器目录下的动作文件，而不是控制器类的动作方法。
希望本文所述对大家PHP程序设计有所帮助。
