* Returns the loader associated with this instance.
*
* @since 2.4.4
- * @return cache_loader|false
+ * @return cache|false
*/
protected function get_loader() {
return $this->loader;
* @todo we should support locking in the session as well. Should be pretty simple to set up.
*
* @internal don't use me directly.
+ * @method cache_store|cache_is_searchable get_store() Returns the cache store which must implement both cache_is_searchable.
*
* @package core
* @category cache
*/
const KEY_PREFIX = 'sess_';
+ /**
+ * This is the key used to track last access.
+ */
+ const LASTACCESS = 'lastaccess';
+
/**
* Override the cache::construct method.
*
* @param cache_definition $definition
* @param cache_store $store
* @param cache_loader|cache_data_source $loader
- * @return void
*/
public function __construct(cache_definition $definition, cache_store $store, $loader = null) {
// First up copy the loadeduserid to the current user id.
$this->currentuserid = self::$loadeduserid;
parent::__construct($definition, $store, $loader);
+
+ // This will trigger check tracked user. If this gets removed a call to that will need to be added here in its place.
+ $this->set(self::LASTACCESS, cache::now());
+
if ($definition->has_invalidation_events()) {
$lastinvalidation = $this->get('lastsessioninvalidation');
if ($lastinvalidation === false) {
}
}
+ /**
+ * Sets the session id for the loader.
+ */
+ protected function set_session_id() {
+ $this->sessionid = preg_replace('#[^a-zA-Z0-9_]#', '_', session_id());
+ }
+
+ /**
+ * Returns the prefix used for all keys.
+ * @return string
+ */
+ protected function get_key_prefix() {
+ return 'u'.$this->currentuserid.'_'.$this->sessionid;
+ }
+
/**
* Parses the key turning it into a string (or array is required) suitable to be passed to the cache store.
*
* @return string|array String unless the store supports multi-identifiers in which case an array if returned.
*/
protected function parse_key($key) {
- if ($key === 'lastaccess') {
- $key = '__lastaccess__';
+ $prefix = $this->get_key_prefix();
+ if ($key === self::LASTACCESS) {
+ return '__lastaccess__'.$prefix;
}
- return 'sess_'.parent::parse_key($key);
+ return $prefix.'_'.parent::parse_key($key);
}
/**
* Check that this cache instance is tracking the current user.
*/
protected function check_tracked_user() {
- if (isset($_SESSION['USER']->id)) {
+ if (isset($_SESSION['USER']->id) && $_SESSION['USER']->id !== null) {
// Get the id of the current user.
$new = $_SESSION['USER']->id;
} else {
// This way we don't bloat the session.
$this->purge();
// Update the session id just in case!
- $this->sessionid = session_id();
+ $this->set_session_id();
}
self::$loadeduserid = $new;
$this->currentuserid = $new;
} else if ($new !== $this->currentuserid) {
// The current user matches the loaded user but not the user last used by this cache.
- $this->purge();
+ $this->purge_current_user();
$this->currentuserid = $new;
// Update the session id just in case!
- $this->sessionid = session_id();
+ $this->set_session_id();
}
}
/**
- * Gets the session data.
- *
- * @param bool $force If true the session data will be loaded from the store again.
- * @return array An array of session data.
+ * Purges the session cache of all data belonging to the current user.
*/
- protected function get_session_data($force = false) {
- if ($this->sessionid === null) {
- $this->sessionid = session_id();
- }
- if (is_array($this->session) && !$force) {
- return $this->session;
- }
- $session = parent::get($this->sessionid);
- if ($session === false) {
- $session = array();
- }
- // We have to write here to ensure that the lastaccess time is recorded.
- // And also in order to ensure the session entry exists as when we save it on __destruct
- // $CFG is likely to have already been destroyed.
- $this->save_session($session);
- return $this->session;
- }
-
- /**
- * Saves the session data.
- *
- * This function also updates the last access time.
- *
- * @param array $session
- * @return bool
- */
- protected function save_session(array $session) {
- $session['lastaccess'] = time();
- $this->session = $session;
- return parent::set($this->sessionid, $this->session);
+ public function purge_current_user() {
+ $keys = $this->get_store()->find_all($this->get_key_prefix());
+ $this->get_store()->delete_many($keys);
}
/**
// 2. Parse the key.
$parsedkey = $this->parse_key($key);
// 3. Get it from the store.
- $result = false;
- $session = $this->get_session_data();
- if (array_key_exists($parsedkey, $session)) {
- $result = $session[$parsedkey];
+ $result = $this->get_store()->get($parsedkey);
+ if ($result !== false) {
if ($result instanceof cache_ttl_wrapper) {
if ($result->has_expired()) {
$this->get_store()->delete($parsedkey);
}
}
// 4. Load if from the loader/datasource if we don't already have it.
- $setaftervalidation = false;
if ($result === false) {
if ($this->perfdebug) {
- cache_helper::record_cache_miss('**static session**', $this->get_definition()->get_id());
+ cache_helper::record_cache_miss($this->storetype, $this->get_definition()->get_id());
}
if ($this->get_loader() !== false) {
// We must pass the original (unparsed) key to the next loader in the chain.
} else if ($this->get_datasource() !== false) {
$result = $this->get_datasource()->load_for_cache($key);
}
- $setaftervalidation = ($result !== false);
+ // 5. Set it to the store if we got it from the loader/datasource.
+ if ($result !== false) {
+ $this->set($key, $result);
+ }
} else if ($this->perfdebug) {
- cache_helper::record_cache_hit('**static session**', $this->get_definition()->get_id());
+ cache_helper::record_cache_hit($this->storetype, $this->get_definition()->get_id());
}
// 5. Validate strictness.
if ($strictness === MUST_EXIST && $result === false) {
throw new moodle_exception('Requested key did not exist in any cache stores and could not be loaded.');
}
- // 6. Set it to the store if we got it from the loader/datasource.
- if ($setaftervalidation) {
- $this->set($key, $result);
- }
- // 7. Make sure we don't pass back anything that could be a reference.
+ // 6. Make sure we don't pass back anything that could be a reference.
// We don't want people modifying the data in the cache.
if (!is_scalar($result)) {
// If data is an object it will be a reference.
public function set($key, $data) {
$this->check_tracked_user();
if ($this->perfdebug) {
- cache_helper::record_cache_set('**static session**', $this->get_definition()->get_id());
+ cache_helper::record_cache_set($this->storetype, $this->get_definition()->get_id());
}
if (is_object($data) && $data instanceof cacheable_object) {
$data = new cache_cached_object($data);
$data = $this->unref($data);
}
// We dont' support native TTL here as we consolidate data for sessions.
- if ($this->has_a_ttl()) {
+ if ($this->has_a_ttl() && !$this->store_supports_native_ttl()) {
$data = new cache_ttl_wrapper($data, $this->get_definition()->get_ttl());
}
- $session = $this->get_session_data();
- $session[$this->parse_key($key)] = $data;
- return $this->save_session($session);
+ return $this->get_store()->set($this->parse_key($key), $data);
}
/**
* @return bool True of success, false otherwise.
*/
public function delete($key, $recurse = true) {
- $this->check_tracked_user();
$parsedkey = $this->parse_key($key);
if ($recurse && $this->get_loader() !== false) {
// Delete from the bottom of the stack first.
$this->get_loader()->delete($key, $recurse);
}
- $session = $this->get_session_data();
- unset($session[$parsedkey]);
- return $this->save_session($session);
+ return $this->get_store()->delete($parsedkey);
}
/**
*/
public function get_many(array $keys, $strictness = IGNORE_MISSING) {
$this->check_tracked_user();
- $return = array();
+ $parsedkeys = array();
+ $keymap = array();
foreach ($keys as $key) {
- $return[$key] = $this->get($key, $strictness);
+ $parsedkey = $this->parse_key($key);
+ $parsedkeys[] = $parsedkey;
+ $keymap[$parsedkey] = $key;
+ }
+ $result = $this->get_store()->get_many($parsedkeys);
+ $mustexist = $strictness === MUST_EXIST;
+ $return = array();
+ foreach ($result as $parsedkey => $value) {
+ if ($value instanceof cache_ttl_wrapper) {
+ /* @var cache_ttl_wrapper $value */
+ if ($value->has_expired()) {
+ $this->get_store()->delete($parsedkey);
+ $value = false;
+ } else {
+ $value = $value->data;
+ }
+ }
+ if ($value instanceof cache_cached_object) {
+ /* @var cache_cached_object $value */
+ $value = $value->restore_object();
+ }
+ if ($value === false && $mustexist) {
+ throw new moodle_exception('Not all the requested keys existed within the cache stores.');
+ }
+ $return[$keymap[$parsedkey]] = $value;
}
return $return;
+
}
/**
* @return int The number of items successfully deleted.
*/
public function delete_many(array $keys, $recurse = true) {
- $this->check_tracked_user();
$parsedkeys = array_map(array($this, 'parse_key'), $keys);
if ($recurse && $this->get_loader() !== false) {
// Delete from the bottom of the stack first.
$this->get_loader()->delete_many($keys, $recurse);
}
- $session = $this->get_session_data();
- foreach ($parsedkeys as $parsedkey) {
- unset($session[$parsedkey]);
- }
- $this->save_session($session);
- return count($keys);
+ return $this->get_store()->delete_many($parsedkeys);
}
/**
*/
public function set_many(array $keyvaluearray) {
$this->check_tracked_user();
- $session = $this->get_session_data();
- $simulatettl = $this->has_a_ttl();
+ $data = array();
+ $definitionid = $this->get_definition()->get_ttl();
+ $simulatettl = $this->has_a_ttl() && !$this->store_supports_native_ttl();
foreach ($keyvaluearray as $key => $value) {
if (is_object($value) && $value instanceof cacheable_object) {
$value = new cache_cached_object($value);
$value = $this->unref($value);
}
if ($simulatettl) {
- $value = new cache_ttl_wrapper($value, $this->get_definition()->get_ttl());
+ $value = new cache_ttl_wrapper($value, $definitionid);
}
- $parsedkey = $this->parse_key($key);
- $session[$parsedkey] = $value;
+ $data[$key] = array(
+ 'key' => $this->parse_key($key),
+ 'value' => $value
+ );
}
if ($this->perfdebug) {
- cache_helper::record_cache_set($this->storetype, $this->get_definition()->get_id());
+ cache_helper::record_cache_set($this->storetype, $definitionid);
}
- $this->save_session($session);
- return count($keyvaluearray);
+ return $this->get_store()->set_many($data);
}
/**
* @return bool True on success, false otherwise
*/
public function purge() {
- // 1. Purge the session object.
- $this->session = array();
- // 2. Delete the record for this users session from the store.
- $this->get_store()->delete($this->sessionid);
- // 3. Optionally purge any stacked loaders in the same way.
+ $this->get_store()->purge();
if ($this->get_loader()) {
- $this->get_loader()->delete($this->sessionid);
+ $this->get_loader()->purge();
}
return true;
}
public function has($key, $tryloadifpossible = false) {
$this->check_tracked_user();
$parsedkey = $this->parse_key($key);
- $session = $this->get_session_data();
- $has = false;
- if ($this->has_a_ttl()) {
+ $store = $this->get_store();
+ if ($this->has_a_ttl() && !$this->store_supports_native_ttl()) {
// The data has a TTL and the store doesn't support it natively.
// We must fetch the data and expect a ttl wrapper.
- if (array_key_exists($parsedkey, $session)) {
- $data = $session[$parsedkey];
- $has = ($data instanceof cache_ttl_wrapper && !$data->has_expired());
- }
+ $data = $store->get($parsedkey);
+ $has = ($data instanceof cache_ttl_wrapper && !$data->has_expired());
+ } else if (!$this->store_supports_key_awareness()) {
+ // The store doesn't support key awareness, get the data and check it manually... puke.
+ // Either no TTL is set of the store supports its handling natively.
+ $data = $store->get($parsedkey);
+ $has = ($data !== false);
} else {
- $has = array_key_exists($parsedkey, $session);
+ // The store supports key awareness, this is easy!
+ // Either no TTL is set of the store supports its handling natively.
+ /* @var cache_store|cache_is_key_aware $store */
+ $has = $store->has($parsedkey);
}
if (!$has && $tryloadifpossible) {
+ $result = null;
if ($this->get_loader() !== false) {
- $result = $this->get_loader()->get($key);
+ $result = $this->get_loader()->get($parsedkey);
} else if ($this->get_datasource() !== null) {
$result = $this->get_datasource()->load_for_cache($key);
}
*/
public function has_all(array $keys) {
$this->check_tracked_user();
- $session = $this->get_session_data();
- foreach ($keys as $key) {
- $has = false;
- $parsedkey = $this->parse_key($key);
- if ($this->has_a_ttl()) {
- // The data has a TTL and the store doesn't support it natively.
- // We must fetch the data and expect a ttl wrapper.
- if (array_key_exists($parsedkey, $session)) {
- $data = $session[$parsedkey];
- $has = ($data instanceof cache_ttl_wrapper && !$data->has_expired());
+ if (($this->has_a_ttl() && !$this->store_supports_native_ttl()) || !$this->store_supports_key_awareness()) {
+ foreach ($keys as $key) {
+ if (!$this->has($key)) {
+ return false;
}
- } else {
- $has = array_key_exists($parsedkey, $session);
- }
- if (!$has) {
- return false;
}
+ return true;
}
- return true;
+ // The cache must be key aware and if support native ttl if it a ttl is set.
+ /* @var cache_store|cache_is_key_aware $store */
+ $store = $this->get_store();
+ return $store->has_all(array_map(array($this, 'parse_key'), $keys));
}
/**
* @return bool True if the cache has at least one of the given keys
*/
public function has_any(array $keys) {
- $this->check_tracked_user();
- $session = $this->get_session_data();
- foreach ($keys as $key) {
- $has = false;
- $parsedkey = $this->parse_key($key);
- if ($this->has_a_ttl()) {
- // The data has a TTL and the store doesn't support it natively.
- // We must fetch the data and expect a ttl wrapper.
- if (array_key_exists($parsedkey, $session)) {
- $data = $session[$parsedkey];
- $has = ($data instanceof cache_ttl_wrapper && !$data->has_expired());
+ if (($this->has_a_ttl() && !$this->store_supports_native_ttl()) || !$this->store_supports_key_awareness()) {
+ foreach ($keys as $key) {
+ if ($this->has($key)) {
+ return true;
}
- } else {
- $has = array_key_exists($parsedkey, $session);
- }
- if ($has) {
- return true;
}
+ return false;
}
- return false;
+ /* @var cache_store|cache_is_key_aware $store */
+ $store = $this->get_store();
+ return $store->has_any(array_map(array($this, 'parse_key'), $keys));
}
/**
* Test the maxsize option.
*/
public function test_maxsize() {
- $defid = 'phpunit/testmaxsize';
$config = cache_config_phpunittest::instance();
- $config->phpunit_add_definition($defid, array(
+ $config->phpunit_add_definition('phpunit/one', array(
'mode' => cache_store::MODE_SESSION,
'component' => 'phpunit',
- 'area' => 'testmaxsize',
+ 'area' => 'one',
'maxsize' => 3
));
- $definition = cache_definition::load($defid, $config->get_definition_by_id($defid));
- $instance = cachestore_session::initialise_test_instance($definition);
- $this->assertTrue($instance->set('key1', 'value1'));
- $this->assertTrue($instance->set('key2', 'value2'));
- $this->assertTrue($instance->set('key3', 'value3'));
+ $config->phpunit_add_definition('phpunit/two', array(
+ 'mode' => cache_store::MODE_SESSION,
+ 'component' => 'phpunit',
+ 'area' => 'two',
+ 'maxsize' => 3
+ ));
- $this->assertTrue($instance->has('key1'));
- $this->assertTrue($instance->has('key2'));
- $this->assertTrue($instance->has('key3'));
+ $cacheone = cache::make('phpunit', 'one');
- $this->assertTrue($instance->set('key4', 'value4'));
- $this->assertTrue($instance->set('key5', 'value5'));
+ $this->assertTrue($cacheone->set('key1', 'value1'));
+ $this->assertTrue($cacheone->set('key2', 'value2'));
+ $this->assertTrue($cacheone->set('key3', 'value3'));
- $this->assertFalse($instance->has('key1'));
- $this->assertFalse($instance->has('key2'));
- $this->assertTrue($instance->has('key3'));
- $this->assertTrue($instance->has('key4'));
- $this->assertTrue($instance->has('key5'));
+ $this->assertTrue($cacheone->has('key1'));
+ $this->assertTrue($cacheone->has('key2'));
+ $this->assertTrue($cacheone->has('key3'));
- $this->assertFalse($instance->get('key1'));
- $this->assertFalse($instance->get('key2'));
- $this->assertEquals('value3', $instance->get('key3'));
- $this->assertEquals('value4', $instance->get('key4'));
- $this->assertEquals('value5', $instance->get('key5'));
+ $this->assertTrue($cacheone->set('key4', 'value4'));
+ $this->assertTrue($cacheone->set('key5', 'value5'));
+
+ $this->assertFalse($cacheone->has('key1'));
+ $this->assertFalse($cacheone->has('key2'));
+ $this->assertTrue($cacheone->has('key3'));
+ $this->assertTrue($cacheone->has('key4'));
+ $this->assertTrue($cacheone->has('key5'));
+
+ $this->assertFalse($cacheone->get('key1'));
+ $this->assertFalse($cacheone->get('key2'));
+ $this->assertEquals('value3', $cacheone->get('key3'));
+ $this->assertEquals('value4', $cacheone->get('key4'));
+ $this->assertEquals('value5', $cacheone->get('key5'));
// Test adding one more.
- $this->assertTrue($instance->set('key6', 'value6'));
- $this->assertFalse($instance->get('key3'));
+ $this->assertTrue($cacheone->set('key6', 'value6'));
+ $this->assertFalse($cacheone->get('key3'));
// Test reducing and then adding to make sure we don't lost one.
- $this->assertTrue($instance->delete('key6'));
- $this->assertTrue($instance->set('key7', 'value7'));
- $this->assertEquals('value4', $instance->get('key4'));
+ $this->assertTrue($cacheone->delete('key6'));
+ $this->assertTrue($cacheone->set('key7', 'value7'));
+ $this->assertEquals('value4', $cacheone->get('key4'));
// Set the same key three times to make sure it doesn't count overrides.
for ($i = 0; $i < 3; $i++) {
- $this->assertTrue($instance->set('key8', 'value8'));
+ $this->assertTrue($cacheone->set('key8', 'value8'));
}
- $this->assertEquals('value7', $instance->get('key7'), 'Overrides are incorrectly incrementing size');
+ $this->assertEquals('value7', $cacheone->get('key7'), 'Overrides are incorrectly incrementing size');
// Test adding many.
- $this->assertEquals(3, $instance->set_many(array(
- array('key' => 'keyA', 'value' => 'valueA'),
- array('key' => 'keyB', 'value' => 'valueB'),
- array('key' => 'keyC', 'value' => 'valueC')
+ $this->assertEquals(3, $cacheone->set_many(array(
+ 'keyA' => 'valueA',
+ 'keyB' => 'valueB',
+ 'keyC' => 'valueC'
)));
$this->assertEquals(array(
'key4' => false,
'keyA' => 'valueA',
'keyB' => 'valueB',
'keyC' => 'valueC'
- ), $instance->get_many(array(
+ ), $cacheone->get_many(array(
'key4', 'key5', 'key6', 'key7', 'keyA', 'keyB', 'keyC'
)));
+
+ $cachetwo = cache::make('phpunit', 'two');
+
+ // Test adding many.
+ $this->assertEquals(3, $cacheone->set_many(array(
+ 'keyA' => 'valueA',
+ 'keyB' => 'valueB',
+ 'keyC' => 'valueC'
+ )));
+
+ $this->assertEquals(3, $cachetwo->set_many(array(
+ 'key1' => 'value1',
+ 'key2' => 'value2',
+ 'key3' => 'value3'
+ )));
+
+ $this->assertEquals(array(
+ 'keyA' => 'valueA',
+ 'keyB' => 'valueB',
+ 'keyC' => 'valueC'
+ ), $cacheone->get_many(array(
+ 'keyA', 'keyB', 'keyC'
+ )));
+
+ $this->assertEquals(array(
+ 'key1' => 'value1',
+ 'key2' => 'value2',
+ 'key3' => 'value3'
+ ), $cachetwo->get_many(array(
+ 'key1', 'key2', 'key3'
+ )));
+
}
}
\ No newline at end of file
