MediaWiki  1.28.1
ServiceContainerTest.php
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1 <?php
3 
9 class ServiceContainerTest extends PHPUnit_Framework_TestCase {
10 
11  private function newServiceContainer( $extraArgs = [] ) {
12  return new ServiceContainer( $extraArgs );
13  }
14 
15  public function testGetServiceNames() {
16  $services = $this->newServiceContainer();
17  $names = $services->getServiceNames();
18 
19  $this->assertInternalType( 'array', $names );
20  $this->assertEmpty( $names );
21 
22  $name = 'TestService92834576';
23  $services->defineService( $name, function() {
24  return null;
25  } );
26 
27  $names = $services->getServiceNames();
28  $this->assertContains( $name, $names );
29  }
30 
31  public function testHasService() {
32  $services = $this->newServiceContainer();
33 
34  $name = 'TestService92834576';
35  $this->assertFalse( $services->hasService( $name ) );
36 
37  $services->defineService( $name, function() {
38  return null;
39  } );
40 
41  $this->assertTrue( $services->hasService( $name ) );
42  }
43 
44  public function testGetService() {
45  $services = $this->newServiceContainer( [ 'Foo' ] );
46 
47  $theService = new stdClass();
48  $name = 'TestService92834576';
49  $count = 0;
50 
51  $services->defineService(
52  $name,
53  function( $actualLocator, $extra ) use ( $services, $theService, &$count ) {
54  $count++;
55  PHPUnit_Framework_Assert::assertSame( $services, $actualLocator );
56  PHPUnit_Framework_Assert::assertSame( $extra, 'Foo' );
57  return $theService;
58  }
59  );
60 
61  $this->assertSame( $theService, $services->getService( $name ) );
62 
63  $services->getService( $name );
64  $this->assertSame( 1, $count, 'instantiator should be called exactly once!' );
65  }
66 
67  public function testGetService_fail_unknown() {
68  $services = $this->newServiceContainer();
69 
70  $name = 'TestService92834576';
71 
72  $this->setExpectedException( 'MediaWiki\Services\NoSuchServiceException' );
73 
74  $services->getService( $name );
75  }
76 
77  public function testPeekService() {
78  $services = $this->newServiceContainer();
79 
80  $services->defineService(
81  'Foo',
82  function() {
83  return new stdClass();
84  }
85  );
86 
87  $services->defineService(
88  'Bar',
89  function() {
90  return new stdClass();
91  }
92  );
93 
94  // trigger instantiation of Foo
95  $services->getService( 'Foo' );
96 
97  $this->assertInternalType(
98  'object',
99  $services->peekService( 'Foo' ),
100  'Peek should return the service object if it had been accessed before.'
101  );
102 
103  $this->assertNull(
104  $services->peekService( 'Bar' ),
105  'Peek should return null if the service was never accessed.'
106  );
107  }
108 
109  public function testPeekService_fail_unknown() {
110  $services = $this->newServiceContainer();
111 
112  $name = 'TestService92834576';
113 
114  $this->setExpectedException( 'MediaWiki\Services\NoSuchServiceException' );
115 
116  $services->peekService( $name );
117  }
118 
119  public function testDefineService() {
120  $services = $this->newServiceContainer();
121 
122  $theService = new stdClass();
123  $name = 'TestService92834576';
124 
125  $services->defineService( $name, function( $actualLocator ) use ( $services, $theService ) {
126  PHPUnit_Framework_Assert::assertSame( $services, $actualLocator );
127  return $theService;
128  } );
129 
130  $this->assertTrue( $services->hasService( $name ) );
131  $this->assertSame( $theService, $services->getService( $name ) );
132  }
133 
135  $services = $this->newServiceContainer();
136 
137  $theService = new stdClass();
138  $name = 'TestService92834576';
139 
140  $services->defineService( $name, function() use ( $theService ) {
141  return $theService;
142  } );
143 
144  $this->setExpectedException( 'MediaWiki\Services\ServiceAlreadyDefinedException' );
145 
146  $services->defineService( $name, function() use ( $theService ) {
147  return $theService;
148  } );
149  }
150 
151  public function testApplyWiring() {
152  $services = $this->newServiceContainer();
153 
154  $wiring = [
155  'Foo' => function() {
156  return 'Foo!';
157  },
158  'Bar' => function() {
159  return 'Bar!';
160  },
161  ];
162 
163  $services->applyWiring( $wiring );
164 
165  $this->assertSame( 'Foo!', $services->getService( 'Foo' ) );
166  $this->assertSame( 'Bar!', $services->getService( 'Bar' ) );
167  }
168 
169  public function testImportWiring() {
170  $services = $this->newServiceContainer();
171 
172  $wiring = [
173  'Foo' => function() {
174  return 'Foo!';
175  },
176  'Bar' => function() {
177  return 'Bar!';
178  },
179  'Car' => function() {
180  return 'FUBAR!';
181  },
182  ];
183 
184  $services->applyWiring( $wiring );
185 
186  $newServices = $this->newServiceContainer();
187 
188  // define a service before importing, so we can later check that
189  // existing service instances survive importWiring()
190  $newServices->defineService( 'Car', function() {
191  return 'Car!';
192  } );
193 
194  // force instantiation
195  $newServices->getService( 'Car' );
196 
197  // Define another service, so we can later check that extra wiring
198  // is not lost.
199  $newServices->defineService( 'Xar', function() {
200  return 'Xar!';
201  } );
202 
203  // import wiring, but skip `Bar`
204  $newServices->importWiring( $services, [ 'Bar' ] );
205 
206  $this->assertNotContains( 'Bar', $newServices->getServiceNames(), 'Skip `Bar` service' );
207  $this->assertSame( 'Foo!', $newServices->getService( 'Foo' ) );
208 
209  // import all wiring, but preserve existing service instance
210  $newServices->importWiring( $services );
211 
212  $this->assertContains( 'Bar', $newServices->getServiceNames(), 'Import all services' );
213  $this->assertSame( 'Bar!', $newServices->getService( 'Bar' ) );
214  $this->assertSame( 'Car!', $newServices->getService( 'Car' ), 'Use existing service instance' );
215  $this->assertSame( 'Xar!', $newServices->getService( 'Xar' ), 'Predefined services are kept' );
216  }
217 
218  public function testLoadWiringFiles() {
219  $services = $this->newServiceContainer();
220 
221  $wiringFiles = [
222  __DIR__ . '/TestWiring1.php',
223  __DIR__ . '/TestWiring2.php',
224  ];
225 
226  $services->loadWiringFiles( $wiringFiles );
227 
228  $this->assertSame( 'Foo!', $services->getService( 'Foo' ) );
229  $this->assertSame( 'Bar!', $services->getService( 'Bar' ) );
230  }
231 
233  $services = $this->newServiceContainer();
234 
235  $wiringFiles = [
236  __DIR__ . '/TestWiring1.php',
237  __DIR__ . '/./TestWiring1.php',
238  ];
239 
240  // loading the same file twice should fail, because
241  $this->setExpectedException( 'MediaWiki\Services\ServiceAlreadyDefinedException' );
242 
243  $services->loadWiringFiles( $wiringFiles );
244  }
245 
246  public function testRedefineService() {
247  $services = $this->newServiceContainer( [ 'Foo' ] );
248 
249  $theService1 = new stdClass();
250  $name = 'TestService92834576';
251 
252  $services->defineService( $name, function() {
253  PHPUnit_Framework_Assert::fail(
254  'The original instantiator function should not get called'
255  );
256  } );
257 
258  // redefine before instantiation
259  $services->redefineService(
260  $name,
261  function( $actualLocator, $extra ) use ( $services, $theService1 ) {
262  PHPUnit_Framework_Assert::assertSame( $services, $actualLocator );
263  PHPUnit_Framework_Assert::assertSame( 'Foo', $extra );
264  return $theService1;
265  }
266  );
267 
268  // force instantiation, check result
269  $this->assertSame( $theService1, $services->getService( $name ) );
270  }
271 
272  public function testRedefineService_disabled() {
273  $services = $this->newServiceContainer( [ 'Foo' ] );
274 
275  $theService1 = new stdClass();
276  $name = 'TestService92834576';
277 
278  $services->defineService( $name, function() {
279  return 'Foo';
280  } );
281 
282  // disable the service. we should be able to redefine it anyway.
283  $services->disableService( $name );
284 
285  $services->redefineService( $name, function() use ( $theService1 ) {
286  return $theService1;
287  } );
288 
289  // force instantiation, check result
290  $this->assertSame( $theService1, $services->getService( $name ) );
291  }
292 
294  $services = $this->newServiceContainer();
295 
296  $theService = new stdClass();
297  $name = 'TestService92834576';
298 
299  $this->setExpectedException( 'MediaWiki\Services\NoSuchServiceException' );
300 
301  $services->redefineService( $name, function() use ( $theService ) {
302  return $theService;
303  } );
304  }
305 
307  $services = $this->newServiceContainer( [ 'Foo' ] );
308 
309  $theService = new stdClass();
310  $name = 'TestService92834576';
311 
312  $services->defineService( $name, function() {
313  return 'Foo';
314  } );
315 
316  // create the service, so it can no longer be redefined
317  $services->getService( $name );
318 
319  $this->setExpectedException( 'MediaWiki\Services\CannotReplaceActiveServiceException' );
320 
321  $services->redefineService( $name, function() use ( $theService ) {
322  return $theService;
323  } );
324  }
325 
326  public function testDisableService() {
327  $services = $this->newServiceContainer( [ 'Foo' ] );
328 
329  $destructible = $this->getMock( 'MediaWiki\Services\DestructibleService' );
330  $destructible->expects( $this->once() )
331  ->method( 'destroy' );
332 
333  $services->defineService( 'Foo', function() use ( $destructible ) {
334  return $destructible;
335  } );
336  $services->defineService( 'Bar', function() {
337  return new stdClass();
338  } );
339  $services->defineService( 'Qux', function() {
340  return new stdClass();
341  } );
342 
343  // instantiate Foo and Bar services
344  $services->getService( 'Foo' );
345  $services->getService( 'Bar' );
346 
347  // disable service, should call destroy() once.
348  $services->disableService( 'Foo' );
349 
350  // disabled service should still be listed
351  $this->assertContains( 'Foo', $services->getServiceNames() );
352 
353  // getting other services should still work
354  $services->getService( 'Bar' );
355 
356  // disable non-destructible service, and not-yet-instantiated service
357  $services->disableService( 'Bar' );
358  $services->disableService( 'Qux' );
359 
360  $this->assertNull( $services->peekService( 'Bar' ) );
361  $this->assertNull( $services->peekService( 'Qux' ) );
362 
363  // disabled service should still be listed
364  $this->assertContains( 'Bar', $services->getServiceNames() );
365  $this->assertContains( 'Qux', $services->getServiceNames() );
366 
367  $this->setExpectedException( 'MediaWiki\Services\ServiceDisabledException' );
368  $services->getService( 'Qux' );
369  }
370 
372  $services = $this->newServiceContainer();
373 
374  $theService = new stdClass();
375  $name = 'TestService92834576';
376 
377  $this->setExpectedException( 'MediaWiki\Services\NoSuchServiceException' );
378 
379  $services->redefineService( $name, function() use ( $theService ) {
380  return $theService;
381  } );
382  }
383 
384  public function testDestroy() {
385  $services = $this->newServiceContainer();
386 
387  $destructible = $this->getMock( 'MediaWiki\Services\DestructibleService' );
388  $destructible->expects( $this->once() )
389  ->method( 'destroy' );
390 
391  $services->defineService( 'Foo', function() use ( $destructible ) {
392  return $destructible;
393  } );
394 
395  $services->defineService( 'Bar', function() {
396  return new stdClass();
397  } );
398 
399  // create the service
400  $services->getService( 'Foo' );
401 
402  // destroy the container
403  $services->destroy();
404 
405  $this->setExpectedException( 'MediaWiki\Services\ContainerDisabledException' );
406  $services->getService( 'Bar' );
407  }
408 
409 }
MediaWiki\Services\ServiceContainer.
Apache License January AND DISTRIBUTION Definitions License shall mean the terms and conditions for use
ServiceContainer provides a generic service to manage named services using lazy instantiation based o...
newServiceContainer($extraArgs=[])
static configuration should be added through ResourceLoaderGetConfigVars instead can be used to get the real title after the basic globals have been set but before ordinary actions take place or wrap services the preferred way to define a new service is the $wgServiceWiringFiles array $services
Definition: hooks.txt:2159
injection txt This is an overview of how MediaWiki makes use of dependency injection The design described here grew from the discussion of RFC T384 The term dependency this means that anything an object needs to operate should be injected from the the object itself should only know narrow no concrete implementation of the logic it relies on The requirement to inject everything typically results in an architecture that based on two main types of and essentially stateless service objects that use other service objects to operate on the value objects As of the beginning MediaWiki is only starting to use the DI approach Much of the code still relies on global state or direct resulting in a highly cyclical dependency which acts as the top level factory for services in MediaWiki which can be used to gain access to default instances of various services MediaWikiServices however also allows new services to be defined and default services to be redefined Services are defined or redefined by providing a callback the instantiator that will return a new instance of the service When it will create an instance of MediaWikiServices and populate it with the services defined in the files listed by thereby bootstrapping the DI framework Per $wgServiceWiringFiles lists includes ServiceWiring php
Definition: injection.txt:35
$count
Allows to change the fields on the form that will be generated $name
Definition: hooks.txt:300