/**
* Runs a standard series of access and use tests on a cache instance.
*
* This function is great because we can use it to ensure all of the loaders perform exactly the same way.
*
* @param cache_loader $cache
*/
protected function run_on_cache(cache_loader $cache)
{
$key = 'testkey';
$datascalar = 'test data';
$dataarray = array('test' => 'data', 'part' => 'two');
$dataobject = (object) $dataarray;
$this->assertTrue($cache->purge());
// Check all read methods.
$this->assertFalse($cache->get($key));
$this->assertFalse($cache->has($key));
$result = $cache->get_many(array($key));
$this->assertCount(1, $result);
$this->assertFalse(reset($result));
$this->assertFalse($cache->has_any(array($key)));
$this->assertFalse($cache->has_all(array($key)));
// Set the data.
$this->assertTrue($cache->set($key, $datascalar));
// Setting it more than once should be permitted.
$this->assertTrue($cache->set($key, $datascalar));
// Recheck the read methods.
$this->assertEquals($datascalar, $cache->get($key));
$this->assertTrue($cache->has($key));
$result = $cache->get_many(array($key));
$this->assertCount(1, $result);
$this->assertEquals($datascalar, reset($result));
$this->assertTrue($cache->has_any(array($key)));
$this->assertTrue($cache->has_all(array($key)));
// Delete it.
$this->assertTrue($cache->delete($key));
// Check its gone.
$this->assertFalse($cache->get($key));
$this->assertFalse($cache->has($key));
// Test arrays.
$this->assertTrue($cache->set($key, $dataarray));
$this->assertEquals($dataarray, $cache->get($key));
// Test objects.
$this->assertTrue($cache->set($key, $dataobject));
$this->assertEquals($dataobject, $cache->get($key));
$specobject = new cache_phpunit_dummy_object('red', 'blue');
$this->assertTrue($cache->set($key, $specobject));
$result = $cache->get($key);
$this->assertInstanceOf('cache_phpunit_dummy_object', $result);
$this->assertEquals('red_ptc_wfc', $result->property1);
$this->assertEquals('blue_ptc_wfc', $result->property2);
// Test set many.
$cache->set_many(array('key1' => 'data1', 'key2' => 'data2'));
$this->assertEquals('data1', $cache->get('key1'));
$this->assertEquals('data2', $cache->get('key2'));
$this->assertTrue($cache->delete('key1'));
$this->assertTrue($cache->delete('key2'));
// Test delete many.
$this->assertTrue($cache->set('key1', 'data1'));
$this->assertTrue($cache->set('key2', 'data2'));
$this->assertEquals('data1', $cache->get('key1'));
$this->assertEquals('data2', $cache->get('key2'));
$this->assertEquals(2, $cache->delete_many(array('key1', 'key2')));
$this->assertFalse($cache->get('key1'));
$this->assertFalse($cache->get('key2'));
// Quick reference test.
$obj = new stdClass();
$obj->key = 'value';
$ref =& $obj;
$this->assertTrue($cache->set('obj', $obj));
$obj->key = 'eulav';
$var = $cache->get('obj');
$this->assertInstanceOf('stdClass', $var);
$this->assertEquals('value', $var->key);
$ref->key = 'eulav';
$var = $cache->get('obj');
$this->assertInstanceOf('stdClass', $var);
$this->assertEquals('value', $var->key);
$this->assertTrue($cache->delete('obj'));
// Deep reference test.
$obj1 = new stdClass();
$obj1->key = 'value';
$obj2 = new stdClass();
$obj2->key = 'test';
$obj3 = new stdClass();
$obj3->key = 'pork';
$obj1->subobj =& $obj2;
$obj2->subobj =& $obj3;
$this->assertTrue($cache->set('obj', $obj1));
$obj1->key = 'eulav';
$obj2->key = 'tset';
$obj3->key = 'krop';
$var = $cache->get('obj');
$this->assertInstanceOf('stdClass', $var);
$this->assertEquals('value', $var->key);
$this->assertInstanceOf('stdClass', $var->subobj);
$this->assertEquals('test', $var->subobj->key);
$this->assertInstanceOf('stdClass', $var->subobj->subobj);
$this->assertEquals('pork', $var->subobj->subobj->key);
$this->assertTrue($cache->delete('obj'));
// Death reference test... basicaly we don't want this to die.
$obj = new stdClass();
$obj->key = 'value';
$obj->self =& $obj;
$this->assertTrue($cache->set('obj', $obj));
$var = $cache->get('obj');
$this->assertInstanceOf('stdClass', $var);
$this->assertEquals('value', $var->key);
// Reference test after retrieve.
$obj = new stdClass();
$obj->key = 'value';
$this->assertTrue($cache->set('obj', $obj));
$var1 = $cache->get('obj');
$this->assertInstanceOf('stdClass', $var1);
$this->assertEquals('value', $var1->key);
$var1->key = 'eulav';
$this->assertEquals('eulav', $var1->key);
$var2 = $cache->get('obj');
$this->assertInstanceOf('stdClass', $var2);
$this->assertEquals('value', $var2->key);
$this->assertTrue($cache->delete('obj'));
}
/**
* Retrieves an array of values for an array of keys.
*
* Using this function comes with potential performance implications.
* Not all cache stores will support get_many/set_many operations and in order to replicate this functionality will call
* the equivalent singular method for each item provided.
* This should not deter you from using this function as there is a performance benefit in situations where the cache store
* does support it, but you should be aware of this fact.
*
* @param array $keys The keys of the data being requested.
* Each key can be any structure although using a scalar string or int is recommended in the interests of performance.
* In advanced cases an array may be useful such as in situations requiring the multi-key functionality.
* @param int $strictness One of IGNORE_MISSING or MUST_EXIST.
* @return array An array of key value pairs for the items that could be retrieved from the cache.
* If MUST_EXIST was used and not all keys existed within the cache then an exception will be thrown.
* Otherwise any key that did not exist will have a data value of false within the results.
* @throws coding_exception
*/
public function get_many(array $keys, $strictness = IGNORE_MISSING)
{
$keysparsed = array();
$parsedkeys = array();
$resultpersist = array();
$resultstore = array();
$keystofind = array();
// First up check the persist cache for each key.
$isusingpersist = $this->is_using_persist_cache();
foreach ($keys as $key) {
$pkey = $this->parse_key($key);
$keysparsed[$key] = $pkey;
$parsedkeys[$pkey] = $key;
$keystofind[$pkey] = $key;
if ($isusingpersist) {
$value = $this->get_from_persist_cache($pkey);
if ($value !== false) {
$resultpersist[$pkey] = $value;
unset($keystofind[$pkey]);
}
}
}
// Next assuming we didn't find all of the keys in the persist cache try loading them from the store.
if (count($keystofind)) {
$resultstore = $this->store->get_many(array_keys($keystofind));
// Process each item in the result to "unwrap" it.
foreach ($resultstore as $key => $value) {
if ($value instanceof cache_ttl_wrapper) {
if ($value->has_expired()) {
$value = false;
} else {
$value = $value->data;
}
}
if ($value instanceof cache_cached_object) {
$value = $value->restore_object();
}
if ($value !== false && $this->is_using_persist_cache()) {
$this->set_in_persist_cache($key, $value);
}
$resultstore[$key] = $value;
}
}
// Merge the result from the persis cache with the results from the store load.
$result = $resultpersist + $resultstore;
unset($resultpersist);
unset($resultstore);
// Next we need to find any missing values and load them from the loader/datasource next in the chain.
$usingloader = $this->loader !== false;
$usingsource = !$usingloader && $this->datasource !== false;
if ($usingloader || $usingsource) {
$missingkeys = array();
foreach ($result as $key => $value) {
if ($value === false) {
$missingkeys[] = $parsedkeys[$key];
}
}
if (!empty($missingkeys)) {
if ($usingloader) {
$resultmissing = $this->loader->get_many($missingkeys);
} else {
$resultmissing = $this->datasource->load_many_for_cache($missingkeys);
}
foreach ($resultmissing as $key => $value) {
$result[$keysparsed[$key]] = $value;
if ($value !== false) {
$this->set($key, $value);
}
}
unset($resultmissing);
}
unset($missingkeys);
}
// Create an array with the original keys and the found values. This will be what we return.
$fullresult = array();
foreach ($result as $key => $value) {
$fullresult[$parsedkeys[$key]] = $value;
}
unset($result);
// Final step is to check strictness.
if ($strictness === MUST_EXIST) {
foreach ($keys as $key) {
if (!array_key_exists($key, $fullresult)) {
throw new coding_exception('Not all the requested keys existed within the cache stores.');
}
}
}
if ($this->perfdebug) {
$hits = 0;
$misses = 0;
foreach ($fullresult as $value) {
if ($value === false) {
$misses++;
} else {
$hits++;
}
}
cache_helper::record_cache_hit($this->storetype, $this->definition->get_id(), $hits);
cache_helper::record_cache_miss($this->storetype, $this->definition->get_id(), $misses);
}
// Return the result. Phew!
return $fullresult;
}
/**
* Runs a standard series of access and use tests on a cache instance.
*
* This function is great because we can use it to ensure all of the loaders perform exactly the same way.
*
* @param cache_loader $cache
*/
protected function run_on_cache(cache_loader $cache)
{
$key = 'contestkey';
$datascalars = array('test data', null);
$dataarray = array('contest' => 'data', 'part' => 'two');
$dataobject = (object) $dataarray;
foreach ($datascalars as $datascalar) {
$this->assertTrue($cache->purge());
// Check all read methods.
$this->assertFalse($cache->get($key));
$this->assertFalse($cache->has($key));
$result = $cache->get_many(array($key));
$this->assertCount(1, $result);
$this->assertFalse(reset($result));
$this->assertFalse($cache->has_any(array($key)));
$this->assertFalse($cache->has_all(array($key)));
// Set the data.
$this->assertTrue($cache->set($key, $datascalar));
// Setting it more than once should be permitted.
$this->assertTrue($cache->set($key, $datascalar));
// Recheck the read methods.
$this->assertEquals($datascalar, $cache->get($key));
$this->assertTrue($cache->has($key));
$result = $cache->get_many(array($key));
$this->assertCount(1, $result);
$this->assertEquals($datascalar, reset($result));
$this->assertTrue($cache->has_any(array($key)));
$this->assertTrue($cache->has_all(array($key)));
// Delete it.
$this->assertTrue($cache->delete($key));
// Check its gone.
$this->assertFalse($cache->get($key));
$this->assertFalse($cache->has($key));
}
// Test arrays.
$this->assertTrue($cache->set($key, $dataarray));
$this->assertEquals($dataarray, $cache->get($key));
// Test objects.
$this->assertTrue($cache->set($key, $dataobject));
$this->assertEquals($dataobject, $cache->get($key));
$specobject = new cache_phpunit_dummy_object('red', 'blue');
$this->assertTrue($cache->set($key, $specobject));
$result = $cache->get($key);
$this->assertInstanceOf('cache_phpunit_dummy_object', $result);
$this->assertEquals('red_ptc_wfc', $result->property1);
$this->assertEquals('blue_ptc_wfc', $result->property2);
// Test array of objects.
$specobject = new cache_phpunit_dummy_object('red', 'blue');
$data = new cacheable_object_array(array(clone $specobject, clone $specobject, clone $specobject));
$this->assertTrue($cache->set($key, $data));
$result = $cache->get($key);
$this->assertInstanceOf('cacheable_object_array', $result);
$this->assertCount(3, $data);
foreach ($result as $item) {
$this->assertInstanceOf('cache_phpunit_dummy_object', $item);
$this->assertEquals('red_ptc_wfc', $item->property1);
$this->assertEquals('blue_ptc_wfc', $item->property2);
}
// Test set many.
$cache->set_many(array('key1' => 'data1', 'key2' => 'data2', 'key3' => null));
$this->assertEquals('data1', $cache->get('key1'));
$this->assertEquals('data2', $cache->get('key2'));
$this->assertEquals(null, $cache->get('key3'));
$this->assertTrue($cache->delete('key1'));
$this->assertTrue($cache->delete('key2'));
$this->assertTrue($cache->delete('key3'));
$cache->set_many(array('key1' => array(1, 2, 3), 'key2' => array(3, 2, 1)));
$this->assertInternalType('array', $cache->get('key1'));
$this->assertInternalType('array', $cache->get('key2'));
$this->assertCount(3, $cache->get('key1'));
$this->assertCount(3, $cache->get('key2'));
$this->assertInternalType('array', $cache->get_many(array('key1', 'key2')));
$this->assertCount(2, $cache->get_many(array('key1', 'key2')));
$this->assertEquals(2, $cache->delete_many(array('key1', 'key2')));
// Test delete many.
$this->assertTrue($cache->set('key1', 'data1'));
$this->assertTrue($cache->set('key2', 'data2'));
$this->assertTrue($cache->set('key3', null));
$this->assertEquals('data1', $cache->get('key1'));
$this->assertEquals('data2', $cache->get('key2'));
$this->assertEquals(null, $cache->get('key3'));
$this->assertEquals(3, $cache->delete_many(array('key1', 'key2', 'key3')));
$this->assertFalse($cache->get('key1'));
$this->assertFalse($cache->get('key2'));
$this->assertFalse($cache->get('key3'));
// Quick reference test.
$obj = new stdClass();
$obj->key = 'value';
$ref =& $obj;
$this->assertTrue($cache->set('obj', $obj));
$obj->key = 'eulav';
$var = $cache->get('obj');
$this->assertInstanceOf('stdClass', $var);
$this->assertEquals('value', $var->key);
$ref->key = 'eulav';
$var = $cache->get('obj');
$this->assertInstanceOf('stdClass', $var);
$this->assertEquals('value', $var->key);
$this->assertTrue($cache->delete('obj'));
// Deep reference test.
$obj1 = new stdClass();
$obj1->key = 'value';
$obj2 = new stdClass();
$obj2->key = 'test';
$obj3 = new stdClass();
$obj3->key = 'pork';
$obj1->subobj =& $obj2;
$obj2->subobj =& $obj3;
$this->assertTrue($cache->set('obj', $obj1));
$obj1->key = 'eulav';
$obj2->key = 'tset';
$obj3->key = 'krop';
$var = $cache->get('obj');
$this->assertInstanceOf('stdClass', $var);
$this->assertEquals('value', $var->key);
$this->assertInstanceOf('stdClass', $var->subobj);
$this->assertEquals('test', $var->subobj->key);
$this->assertInstanceOf('stdClass', $var->subobj->subobj);
$this->assertEquals('pork', $var->subobj->subobj->key);
$this->assertTrue($cache->delete('obj'));
// Death reference test... basicaly we don't want this to die.
$obj = new stdClass();
$obj->key = 'value';
$obj->self =& $obj;
$this->assertTrue($cache->set('obj', $obj));
$var = $cache->get('obj');
$this->assertInstanceOf('stdClass', $var);
$this->assertEquals('value', $var->key);
// Reference test after retrieve.
$obj = new stdClass();
$obj->key = 'value';
$this->assertTrue($cache->set('obj', $obj));
$var1 = $cache->get('obj');
$this->assertInstanceOf('stdClass', $var1);
$this->assertEquals('value', $var1->key);
$var1->key = 'eulav';
$this->assertEquals('eulav', $var1->key);
$var2 = $cache->get('obj');
$this->assertInstanceOf('stdClass', $var2);
$this->assertEquals('value', $var2->key);
$this->assertTrue($cache->delete('obj'));
// Test strictness exceptions.
try {
$cache->get('exception', MUST_EXIST);
$this->fail('Exception expected from cache::get using MUST_EXIST');
} catch (Exception $e) {
$this->assertTrue(true);
}
try {
$cache->get_many(array('exception1', 'exception2'), MUST_EXIST);
$this->fail('Exception expected from cache::get_many using MUST_EXIST');
} catch (Exception $e) {
$this->assertTrue(true);
}
$cache->set('test', 'test');
try {
$cache->get_many(array('test', 'exception'), MUST_EXIST);
$this->fail('Exception expected from cache::get_many using MUST_EXIST');
} catch (Exception $e) {
$this->assertTrue(true);
}
}
