tests/phpunit/includes/objectcache/BagOStuffTest.php

   1 <?php
   2 /**
   3  * This class will test BagOStuff.
   4  *
   5  * @author     Matthias Mullie <mmullie@wikimedia.org>
   6  */
   7 class BagOStuffTest extends MediaWikiTestCase {
   8         private $cache;
   9
  10         protected function setUp() {
  11                 parent::setUp();
  12
  13                 // type defined through parameter
  14                 if ( $this->getCliArg( 'use-bagostuff=' ) ) {
  15                         $name = $this->getCliArg( 'use-bagostuff=' );
  16
  17                         $this->cache = ObjectCache::newFromId( $name );
  18                 } else {
  19                         // no type defined - use simple hash
  20                         $this->cache = new HashBagOStuff;
  21                 }
  22
  23                 $this->cache->delete( wfMemcKey( 'test' ) );
  24         }
  25
  26         protected function tearDown() {
  27         }
  28
  29         public function testMerge() {
  30                 $key = wfMemcKey( 'test' );
  31
  32                 $usleep = 0;
  33
  34                 /**
  35                  * Callback method: append "merged" to whatever is in cache.
  36                  *
  37                  * @param BagOStuff $cache
  38                  * @param string $key
  39                  * @param int $existingValue
  40                  * @use int $usleep
  41                  * @return int
  42                  */
  43                 $callback = function ( BagOStuff $cache, $key, $existingValue ) use ( &$usleep ) {
  44                         // let's pretend this is an expensive callback to test concurrent merge attempts
  45                         usleep( $usleep );
  46
  47                         if ( $existingValue === false ) {
  48                                 return 'merged';
  49                         }
  50
  51                         return $existingValue . 'merged';
  52                 };
  53
  54                 // merge on non-existing value
  55                 $merged = $this->cache->merge( $key, $callback, 0 );
  56                 $this->assertTrue( $merged );
  57                 $this->assertEquals( $this->cache->get( $key ), 'merged' );
  58
  59                 // merge on existing value
  60                 $merged = $this->cache->merge( $key, $callback, 0 );
  61                 $this->assertTrue( $merged );
  62                 $this->assertEquals( $this->cache->get( $key ), 'mergedmerged' );
  63
  64                 /*
  65                  * Test concurrent merges by forking this process, if:
  66                  * - not manually called with --use-bagostuff
  67                  * - pcntl_fork is supported by the system
  68                  * - cache type will correctly support calls over forks
  69                  */
  70                 $fork = (bool)$this->getCliArg( 'use-bagostuff=' );
  71                 $fork &= function_exists( 'pcntl_fork' );
  72                 $fork &= !$this->cache instanceof HashBagOStuff;
  73                 $fork &= !$this->cache instanceof EmptyBagOStuff;
  74                 $fork &= !$this->cache instanceof MultiWriteBagOStuff;
  75                 if ( $fork ) {
  76                         // callback should take awhile now so that we can test concurrent merge attempts
  77                         $usleep = 5000;
  78
  79                         $pid = pcntl_fork();
  80                         if ( $pid == -1 ) {
  81                                 // can't fork, ignore this test...
  82                         } elseif ( $pid ) {
  83                                 // wait a little, making sure that the child process is calling merge
  84                                 usleep( 3000 );
  85
  86                                 // attempt a merge - this should fail
  87                                 $merged = $this->cache->merge( $key, $callback, 0, 1 );
  88
  89                                 // merge has failed because child process was merging (and we only attempted once)
  90                                 $this->assertFalse( $merged );
  91
  92                                 // make sure the child's merge is completed and verify
  93                                 usleep( 3000 );
  94                                 $this->assertEquals( $this->cache->get( $key ), 'mergedmergedmerged' );
  95                         } else {
  96                                 $this->cache->merge( $key, $callback, 0, 1 );
  97
  98                                 // Note: I'm not even going to check if the merge worked, I'll
  99                                 // compare values in the parent process to test if this merge worked.
 100                                 // I'm just going to exit this child process, since I don't want the
 101                                 // child to output any test results (would be rather confusing to
 102                                 // have test output twice)
 103                                 exit;
 104                         }
 105                 }
 106         }
 107
 108         public function testAdd() {
 109                 $key = wfMemcKey( 'test' );
 110                 $this->assertTrue( $this->cache->add( $key, 'test' ) );
 111         }
 112
 113         public function testGet() {
 114                 $value = array( 'this' => 'is', 'a' => 'test' );
 115
 116                 $key = wfMemcKey( 'test' );
 117                 $this->cache->add( $key, $value );
 118                 $this->assertEquals( $this->cache->get( $key ), $value );
 119         }
 120
 121         public function testGetMulti() {
 122                 $value1 = array( 'this' => 'is', 'a' => 'test' );
 123                 $value2 = array( 'this' => 'is', 'another' => 'test' );
 124
 125                 $key1 = wfMemcKey( 'test1' );
 126                 $key2 = wfMemcKey( 'test2' );
 127
 128                 $this->cache->add( $key1, $value1 );
 129                 $this->cache->add( $key2, $value2 );
 130
 131                 $this->assertEquals( $this->cache->getMulti( array( $key1, $key2 ) ), array( $key1 => $value1, $key2 => $value2 ) );
 132
 133                 // cleanup
 134                 $this->cache->delete( $key1 );
 135                 $this->cache->delete( $key2 );
 136         }
 137 }