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finished cleanup of caching components.

tags/2.0.0-beta
Qiang Xue 12 years ago
parent
ce168fb3c8
commit
11d374a83d
7 changed files with 122 additions and 127 deletions
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  1. 165
      framework/caching/Cache.php
  2. 4
      framework/caching/ChainedDependency.php
  3. 40
      framework/caching/DbCache.php
  4. 9
      framework/caching/DbDependency.php
  5. 10
      framework/caching/FileCache.php
  6. 5
      framework/caching/MemCache.php
  7. 2
      framework/caching/ZendDataCache.php

165
framework/caching/Cache.php
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@ -9,8 +9,7 @@
namespace yii\caching; namespace yii\caching;
use yii\base\ApplicationComponent; use yii\base\Component;
use yii\base\InvalidCallException;
/** /**
* Cache is the base class for cache classes supporting different cache storage implementation. * Cache is the base class for cache classes supporting different cache storage implementation.
@ -21,13 +20,16 @@ use yii\base\InvalidCallException;
* can also be specified when calling [[set()]]. If the data item expires or the dependency * can also be specified when calling [[set()]]. If the data item expires or the dependency
* changes at the time of calling [[get()]], the cache will return no data. * changes at the time of calling [[get()]], the cache will return no data.
* *
* Derived classes should implement the following methods: * A typical usage pattern of cache is like the following:
* *
* - [[getValue]]: retrieve the value with a key (if any) from cache * ~~~
* - [[setValue]]: store the value with a key into cache * $key = 'demo';
* - [[addValue]]: store the value only if the cache does not have this key before * $data = $cache->get($key);
* - [[deleteValue]]: delete the value with the specified key from cache * if ($data === false) {
* - [[flushValues]]: delete all values from cache * // ...generate $data here...
* $cache->set($key, $data, $expire, $dependency);
* }
* ~~~
* *
* Because Cache implements the ArrayAccess interface, it can be used like an array. For example, * Because Cache implements the ArrayAccess interface, it can be used like an array. For example,
* *
@ -36,10 +38,19 @@ use yii\base\InvalidCallException;
* echo $cache['foo']; * echo $cache['foo'];
* ~~~ * ~~~
* *
* Derived classes should implement the following methods:
*
* - [[getValue()]]: retrieve the value with a key (if any) from cache
* - [[setValue()]]: store the value with a key into cache
* - [[addValue()]]: store the value only if the cache does not have this key before
* - [[deleteValue()]]: delete the value with the specified key from cache
* - [[flushValues()]]: delete all values from cache
*
*
* @author Qiang Xue <qiang.xue@gmail.com> * @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0 * @since 2.0
*/ */
abstract class Cache extends ApplicationComponent implements \ArrayAccess abstract class Cache extends Component implements \ArrayAccess
{ {
/** /**
* @var string a string prefixed to every cache key so that it is unique. Defaults to null, meaning using * @var string a string prefixed to every cache key so that it is unique. Defaults to null, meaning using
@ -59,64 +70,45 @@ abstract class Cache extends ApplicationComponent implements \ArrayAccess
*/ */
public $serializer; public $serializer;
/**
* Initializes the application component.
* This method overrides the parent implementation by setting default cache key prefix.
*/
public function init()
{
parent::init();
if ($this->keyPrefix === null) {
$this->keyPrefix = \Yii::$application->id;
}
}
/** /**
* Generates a cache key from one or multiple parameters. * Builds a normalized cache key from one or multiple parameters.
* The cache key generated is safe to be used to access cache via methods such as [[get()]], [[set()]]. *
* For example: * The generated key contains letters and digits only, and its length is no more than 32.
*
* If only one parameter is given and it is already a normalized key, then
* it will be returned back without change. Otherwise, a normalized key
* is generated by serializing all given parameters and applying MD5 hashing.
*
* The following example builds a cache key using three parameters:
* *
* ~~~ * ~~~
* $key = $cache->buildKey($className, $method, $id); * $key = $cache->buildKey($className, $method, $id);
* ~~~ * ~~~
* *
* @param string $id the * @param string $key the first parameter
* @return string the cache key * @return string the generated cache key
* @throws InvalidCallException if the method receives no parameter
*/ */
public function generateKey($id) public function buildKey($key)
{ {
$n = func_num_args(); if (func_num_args() === 1 && ctype_alnum($key) && strlen($key) <= 32) {
if ($n === 1 && is_string($id) && ctype_alnum($id) && strlen($id) <= 32) { return (string)$key;
return $this->keyPrefix . $id;
} elseif ($n < 1) {
throw new InvalidCallException(__METHOD__ . ' requires at least one parameter.');
} else { } else {
$params = func_get_args(); $params = func_get_args();
return $this->keyPrefix . md5(serialize($params)); return md5(serialize($params));
} }
} }
/** /**
* Generates a normalized key from a given key.
* The normalized key is obtained by hashing the given key via MD5 and then prefixing it with [[keyPrefix]].
* @param string $key a key identifying a value to be cached
* @return string a key generated from the provided key which ensures the uniqueness across applications
*/
protected function generateKey($key)
{
return $this->keyPrefix . md5($key);
}
/**
* Retrieves a value from cache with a specified key. * Retrieves a value from cache with a specified key.
* @param string $id a key identifying the cached value * @param string $key a key identifying the cached value
* @return mixed the value stored in cache, false if the value is not in the cache, expired, * @return mixed the value stored in cache, false if the value is not in the cache, expired,
* or the dependency associated with the cached data has changed. * or the dependency associated with the cached data has changed.
*/ */
public function get($id) public function get($key)
{ {
$value = $this->getValue($this->generateKey($id)); $key = $this->keyPrefix . $this->buildKey($key);
$value = $this->getValue($key);
if ($value === false || $this->serializer === false) { if ($value === false || $this->serializer === false) {
return $value; return $value;
} elseif ($this->serializer === null) { } elseif ($this->serializer === null) {
@ -124,7 +116,7 @@ abstract class Cache extends ApplicationComponent implements \ArrayAccess
} else { } else {
$value = call_user_func($this->serializer[1], $value); $value = call_user_func($this->serializer[1], $value);
} }
if (is_array($value) && ($value[1] instanceof Dependency) || !$value[1]->getHasChanged()) { if (is_array($value) && !($value[1] instanceof Dependency && $value[1]->getHasChanged())) {
return $value[0]; return $value[0];
} else { } else {
return false; return false;
@ -136,30 +128,30 @@ abstract class Cache extends ApplicationComponent implements \ArrayAccess
* Some caches (such as memcache, apc) allow retrieving multiple cached values at the same time, * Some caches (such as memcache, apc) allow retrieving multiple cached values at the same time,
* which may improve the performance. In case a cache does not support this feature natively, * which may improve the performance. In case a cache does not support this feature natively,
* this method will try to simulate it. * this method will try to simulate it.
* @param array $ids list of keys identifying the cached values * @param array $keys list of keys identifying the cached values
* @return array list of cached values corresponding to the specified keys. The array * @return array list of cached values corresponding to the specified keys. The array
* is returned in terms of (key,value) pairs. * is returned in terms of (key,value) pairs.
* If a value is not cached or expired, the corresponding array value will be false. * If a value is not cached or expired, the corresponding array value will be false.
*/ */
public function mget($ids) public function mget($keys)
{ {
$uids = array(); $keyMap = array();
foreach ($ids as $id) { foreach ($keys as $key) {
$uids[$id] = $this->generateKey($id); $keyMap[$key] = $this->keyPrefix . $this->buildKey($key);
} }
$values = $this->getValues($uids); $values = $this->getValues(array_values($keyMap));
$results = array(); $results = array();
foreach ($keyMap as $key => $newKey) {
$results[$key] = false;
if (isset($values[$newKey])) {
if ($this->serializer === false) { if ($this->serializer === false) {
foreach ($uids as $id => $uid) { $results[$key] = $values[$newKey];
$results[$id] = isset($values[$uid]) ? $values[$uid] : false;
}
} else { } else {
foreach ($uids as $id => $uid) { $value = $this->serializer === null ? unserialize($values[$newKey])
$results[$id] = false; : call_user_func($this->serializer[1], $values[$newKey]);
if (isset($values[$uid])) {
$value = $this->serializer === null ? unserialize($values[$uid]) : call_user_func($this->serializer[1], $values[$uid]); if (is_array($value) && !($value[1] instanceof Dependency && $value[1]->getHasChanged())) {
if (is_array($value) && (!($value[1] instanceof Dependency) || !$value[1]->getHasChanged())) { $results[$key] = $value[0];
$results[$id] = $value[0];
} }
} }
} }
@ -172,14 +164,15 @@ abstract class Cache extends ApplicationComponent implements \ArrayAccess
* If the cache already contains such a key, the existing value and * If the cache already contains such a key, the existing value and
* expiration time will be replaced with the new ones, respectively. * expiration time will be replaced with the new ones, respectively.
* *
* @param string $id the key identifying the value to be cached * @param string $key the key identifying the value to be cached
* @param mixed $value the value to be cached * @param mixed $value the value to be cached
* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire. * @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire.
* @param Dependency $dependency dependency of the cached item. If the dependency changes, * @param Dependency $dependency dependency of the cached item. If the dependency changes,
* the corresponding value in the cache will be invalidated when it is fetched via [[get()]]. * the corresponding value in the cache will be invalidated when it is fetched via [[get()]].
* This parameter is ignored if [[serializer]] is false.
* @return boolean whether the value is successfully stored into cache * @return boolean whether the value is successfully stored into cache
*/ */
public function set($id, $value, $expire = 0, $dependency = null) public function set($key, $value, $expire = 0, $dependency = null)
{ {
if ($dependency !== null && $this->serializer !== false) { if ($dependency !== null && $this->serializer !== false) {
$dependency->evaluateDependency(); $dependency->evaluateDependency();
@ -189,20 +182,22 @@ abstract class Cache extends ApplicationComponent implements \ArrayAccess
} elseif ($this->serializer !== false) { } elseif ($this->serializer !== false) {
$value = call_user_func($this->serializer[0], array($value, $dependency)); $value = call_user_func($this->serializer[0], array($value, $dependency));
} }
return $this->setValue($this->generateKey($id), $value, $expire); $key = $this->keyPrefix . $this->buildKey($key);
return $this->setValue($key, $value, $expire);
} }
/** /**
* Stores a value identified by a key into cache if the cache does not contain this key. * Stores a value identified by a key into cache if the cache does not contain this key.
* Nothing will be done if the cache already contains the key. * Nothing will be done if the cache already contains the key.
* @param string $id the key identifying the value to be cached * @param string $key the key identifying the value to be cached
* @param mixed $value the value to be cached * @param mixed $value the value to be cached
* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire. * @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire.
* @param Dependency $dependency dependency of the cached item. If the dependency changes, * @param Dependency $dependency dependency of the cached item. If the dependency changes,
* the corresponding value in the cache will be invalidated when it is fetched via [[get()]]. * the corresponding value in the cache will be invalidated when it is fetched via [[get()]].
* This parameter is ignored if [[serializer]] is false.
* @return boolean whether the value is successfully stored into cache * @return boolean whether the value is successfully stored into cache
*/ */
public function add($id, $value, $expire = 0, $dependency = null) public function add($key, $value, $expire = 0, $dependency = null)
{ {
if ($dependency !== null && $this->serializer !== false) { if ($dependency !== null && $this->serializer !== false) {
$dependency->evaluateDependency(); $dependency->evaluateDependency();
@ -212,17 +207,19 @@ abstract class Cache extends ApplicationComponent implements \ArrayAccess
} elseif ($this->serializer !== false) { } elseif ($this->serializer !== false) {
$value = call_user_func($this->serializer[0], array($value, $dependency)); $value = call_user_func($this->serializer[0], array($value, $dependency));
} }
return $this->addValue($this->generateKey($id), $value, $expire); $key = $this->keyPrefix . $this->buildKey($key);
return $this->addValue($key, $value, $expire);
} }
/** /**
* Deletes a value with the specified key from cache * Deletes a value with the specified key from cache
* @param string $id the key of the value to be deleted * @param string $key the key of the value to be deleted
* @return boolean if no error happens during deletion * @return boolean if no error happens during deletion
*/ */
public function delete($id) public function delete($key)
{ {
return $this->deleteValue($this->generateKey($id)); $key = $this->keyPrefix . $this->buildKey($key);
return $this->deleteValue($key);
} }
/** /**
@ -301,23 +298,23 @@ abstract class Cache extends ApplicationComponent implements \ArrayAccess
/** /**
* Returns whether there is a cache entry with a specified key. * Returns whether there is a cache entry with a specified key.
* This method is required by the interface ArrayAccess. * This method is required by the interface ArrayAccess.
* @param string $id a key identifying the cached value * @param string $key a key identifying the cached value
* @return boolean * @return boolean
*/ */
public function offsetExists($id) public function offsetExists($key)
{ {
return $this->get($id) !== false; return $this->get($key) !== false;
} }
/** /**
* Retrieves the value from cache with a specified key. * Retrieves the value from cache with a specified key.
* This method is required by the interface ArrayAccess. * This method is required by the interface ArrayAccess.
* @param string $id a key identifying the cached value * @param string $key a key identifying the cached value
* @return mixed the value stored in cache, false if the value is not in the cache or expired. * @return mixed the value stored in cache, false if the value is not in the cache or expired.
*/ */
public function offsetGet($id) public function offsetGet($key)
{ {
return $this->get($id); return $this->get($key);
} }
/** /**
@ -325,21 +322,21 @@ abstract class Cache extends ApplicationComponent implements \ArrayAccess
* If the cache already contains such a key, the existing value will be * If the cache already contains such a key, the existing value will be
* replaced with the new ones. To add expiration and dependencies, use the [[set()]] method. * replaced with the new ones. To add expiration and dependencies, use the [[set()]] method.
* This method is required by the interface ArrayAccess. * This method is required by the interface ArrayAccess.
* @param string $id the key identifying the value to be cached * @param string $key the key identifying the value to be cached
* @param mixed $value the value to be cached * @param mixed $value the value to be cached
*/ */
public function offsetSet($id, $value) public function offsetSet($key, $value)
{ {
$this->set($id, $value); $this->set($key, $value);
} }
/** /**
* Deletes the value with the specified key from cache * Deletes the value with the specified key from cache
* This method is required by the interface ArrayAccess. * This method is required by the interface ArrayAccess.
* @param string $id the key of the value to be deleted * @param string $key the key of the value to be deleted
*/ */
public function offsetUnset($id) public function offsetUnset($key)
{ {
$this->delete($id); $this->delete($key);
} }
} }

4
framework/caching/ChainedDependency.php
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@ -81,9 +81,9 @@ class ChainedDependency extends Dependency
*/ */
public function getHasChanged() public function getHasChanged()
{ {
foreach ($this->dependencies as $dependency) { foreach ($this->dependencies as $i => $dependency) {
if (!$dependency instanceof Dependency) { if (!$dependency instanceof Dependency) {
$dependency = \Yii::createObject($dependency); $this->dependencies[$i] = $dependency = \Yii::createObject($dependency);
} }
if ($this->dependOnAll && $dependency->getHasChanged()) { if ($this->dependOnAll && $dependency->getHasChanged()) {
return true; return true;

40
framework/caching/DbCache.php
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@ -9,7 +9,7 @@
namespace yii\caching; namespace yii\caching;
use yii\base\Exception; use yii\base\InvalidConfigException;
use yii\db\Connection; use yii\db\Connection;
use yii\db\Query; use yii\db\Query;
@ -57,7 +57,7 @@ class DbCache extends Cache
public $cacheTableName = 'tbl_cache'; public $cacheTableName = 'tbl_cache';
/** /**
* @var integer the probability (parts per million) that garbage collection (GC) should be performed * @var integer the probability (parts per million) that garbage collection (GC) should be performed
* when storing a piece of data in the cache. Defaults to 100, meaning 0.01% chance. * when storing a piece of data in the cache. Defaults to 10, meaning 0.001% chance.
* This number should be between 0 and 1000000. A value 0 meaning no GC will be performed at all. * This number should be between 0 and 1000000. A value 0 meaning no GC will be performed at all.
**/ **/
public $gcProbability = 100; public $gcProbability = 100;
@ -69,7 +69,7 @@ class DbCache extends Cache
/** /**
* Returns the DB connection instance used for caching purpose. * Returns the DB connection instance used for caching purpose.
* @return Connection the DB connection instance * @return Connection the DB connection instance
* @throws Exception if [[connectionID]] does not point to a valid application component. * @throws InvalidConfigException if [[connectionID]] does not point to a valid application component.
*/ */
public function getDb() public function getDb()
{ {
@ -78,7 +78,7 @@ class DbCache extends Cache
if ($db instanceof Connection) { if ($db instanceof Connection) {
$this->_db = $db; $this->_db = $db;
} else { } else {
throw new Exception("DbCache.connectionID must refer to the ID of a DB connection application component."); throw new InvalidConfigException("DbCache::connectionID must refer to the ID of a DB application component.");
} }
} }
return $this->_db; return $this->_db;
@ -163,13 +163,13 @@ class DbCache extends Cache
*/ */
protected function setValue($key, $value, $expire) protected function setValue($key, $value, $expire)
{ {
$query = new Query; $command = $this->getDb()->createCommand();
$command = $query->update($this->cacheTableName, array( $command->update($this->cacheTableName, array(
'expire' => $expire > 0 ? $expire + time() : 0, 'expire' => $expire > 0 ? $expire + time() : 0,
'data' => array($value, \PDO::PARAM_LOB), 'data' => array($value, \PDO::PARAM_LOB),
), array( ), array(
'id' => $key, 'id' => $key,
))->createCommand($this->getDb()); ));;
if ($command->execute()) { if ($command->execute()) {
$this->gc(); $this->gc();
@ -198,16 +198,16 @@ class DbCache extends Cache
$expire = 0; $expire = 0;
} }
$query = new Query; $command = $this->getDb()->createCommand();
$command = $query->insert($this->cacheTableName, array( $command->insert($this->cacheTableName, array(
'id' => $key, 'id' => $key,
'expire' => $expire, 'expire' => $expire,
'data' => array($value, \PDO::PARAM_LOB), 'data' => array($value, \PDO::PARAM_LOB),
))->createCommand($this->getDb()); ));
try { try {
$command->execute(); $command->execute();
return true; return true;
} catch (Exception $e) { } catch (\Exception $e) {
return false; return false;
} }
} }
@ -220,10 +220,8 @@ class DbCache extends Cache
*/ */
protected function deleteValue($key) protected function deleteValue($key)
{ {
$query = new Query; $command = $this->getDb()->createCommand();
$query->delete($this->cacheTableName, array('id' => $key)) $command->delete($this->cacheTableName, array('id' => $key))->execute();
->createCommand($this->getDb())
->execute();
return true; return true;
} }
@ -235,10 +233,8 @@ class DbCache extends Cache
public function gc($force = false) public function gc($force = false)
{ {
if ($force || mt_rand(0, 1000000) < $this->gcProbability) { if ($force || mt_rand(0, 1000000) < $this->gcProbability) {
$query = new Query; $command = $this->getDb()->createCommand();
$query->delete($this->cacheTableName, 'expire > 0 AND expire < ' . time()) $command->delete($this->cacheTableName, 'expire > 0 AND expire < ' . time())->execute();
->createCommand($this->getDb())
->execute();
} }
} }
@ -249,10 +245,8 @@ class DbCache extends Cache
*/ */
protected function flushValues() protected function flushValues()
{ {
$query = new Query; $command = $this->getDb()->createCommand();
$query->delete($this->cacheTableName) $command->delete($this->cacheTableName)->execute();
->createCommand($this->getDb())
->execute();
return true; return true;
} }
} }

9
framework/caching/DbDependency.php
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@ -9,7 +9,7 @@
namespace yii\caching; namespace yii\caching;
use yii\base\Exception; use yii\base\InvalidConfigException;
use yii\db\Connection; use yii\db\Connection;
use yii\db\Query; use yii\db\Query;
@ -68,6 +68,9 @@ class DbDependency extends Dependency
protected function generateDependencyData() protected function generateDependencyData()
{ {
$db = $this->getDb(); $db = $this->getDb();
/**
* @var \yii\db\Command $command
*/
$command = $this->query->createCommand($db); $command = $this->query->createCommand($db);
if ($db->enableQueryCache) { if ($db->enableQueryCache) {
// temporarily disable and re-enable query caching // temporarily disable and re-enable query caching
@ -83,7 +86,7 @@ class DbDependency extends Dependency
/** /**
* Returns the DB connection instance used for caching purpose. * Returns the DB connection instance used for caching purpose.
* @return Connection the DB connection instance * @return Connection the DB connection instance
* @throws Exception if [[connectionID]] does not point to a valid application component. * @throws InvalidConfigException if [[connectionID]] does not point to a valid application component.
*/ */
public function getDb() public function getDb()
{ {
@ -92,7 +95,7 @@ class DbDependency extends Dependency
if ($db instanceof Connection) { if ($db instanceof Connection) {
$this->_db = $db; $this->_db = $db;
} else { } else {
throw new Exception("DbDependency.connectionID must refer to the ID of a DB connection application component."); throw new InvalidConfigException("DbCache::connectionID must refer to the ID of a DB application component.");
} }
} }
return $this->_db; return $this->_db;

10
framework/caching/FileCache.php
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@ -9,7 +9,7 @@
namespace yii\caching; namespace yii\caching;
use yii\base\Exception; use yii\base\InvalidConfigException;
/** /**
* FileCache implements a cache component using files. * FileCache implements a cache component using files.
@ -42,10 +42,10 @@ class FileCache extends Cache
public $directoryLevel = 1; public $directoryLevel = 1;
/** /**
* @var integer the probability (parts per million) that garbage collection (GC) should be performed * @var integer the probability (parts per million) that garbage collection (GC) should be performed
* when storing a piece of data in the cache. Defaults to 100, meaning 0.01% chance. * when storing a piece of data in the cache. Defaults to 10, meaning 0.001% chance.
* This number should be between 0 and 1000000. A value 0 meaning no GC will be performed at all. * This number should be between 0 and 1000000. A value 0 means no GC will be performed at all.
**/ **/
public $gcProbability = 100; public $gcProbability = 10;
/** /**
* Initializes this component by ensuring the existence of the cache path. * Initializes this component by ensuring the existence of the cache path.
@ -55,7 +55,7 @@ class FileCache extends Cache
parent::init(); parent::init();
$this->cachePath = \Yii::getAlias($this->cachePath); $this->cachePath = \Yii::getAlias($this->cachePath);
if ($this->cachePath === false) { if ($this->cachePath === false) {
throw new Exception('FileCache.cachePath must be a valid path alias.'); throw new InvalidConfigException('FileCache.cachePath must be a valid path alias.');
} }
if (!is_dir($this->cachePath)) { if (!is_dir($this->cachePath)) {
mkdir($this->cachePath, 0777, true); mkdir($this->cachePath, 0777, true);

5
framework/caching/MemCache.php
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@ -10,6 +10,7 @@
namespace yii\caching; namespace yii\caching;
use yii\base\Exception; use yii\base\Exception;
use yii\base\InvalidConfigException;
/** /**
* MemCache implements a cache application component based on [memcache](http://pecl.php.net/package/memcache) * MemCache implements a cache application component based on [memcache](http://pecl.php.net/package/memcache)
@ -109,12 +110,12 @@ class MemCache extends Cache
* @return \Memcache|\Memcached the memcache (or memcached) object used by this cache component. * @return \Memcache|\Memcached the memcache (or memcached) object used by this cache component.
* @throws Exception if memcache or memcached extension is not loaded * @throws Exception if memcache or memcached extension is not loaded
*/ */
public function getMemCache() public function getMemcache()
{ {
if ($this->_cache === null) { if ($this->_cache === null) {
$extension = $this->useMemcached ? 'memcached' : 'memcache'; $extension = $this->useMemcached ? 'memcached' : 'memcache';
if (!extension_loaded($extension)) { if (!extension_loaded($extension)) {
throw new Exception("MemCache requires PHP $extension extension to be loaded."); throw new InvalidConfigException("MemCache requires PHP $extension extension to be loaded.");
} }
$this->_cache = $this->useMemcached ? new \Memcached : new \Memcache; $this->_cache = $this->useMemcached ? new \Memcached : new \Memcache;
} }

2
framework/caching/ZendDataCache.php
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@ -31,7 +31,7 @@ class ZendDataCache extends Cache
protected function getValue($key) protected function getValue($key)
{ {
$result = zend_shm_cache_fetch($key); $result = zend_shm_cache_fetch($key);
return $result !== NULL ? $result : false; return $result === null ? false : $result;
} }
/** /**

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