/**
* Sends several key => value pairs to the cache.
*
* 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.
*
* <code>
* // This code will add four entries to the cache, one for each url.
* $cache->set_many(array(
* 'main' => 'http://moodle.org',
* 'docs' => 'http://docs.moodle.org',
* 'tracker' => 'http://tracker.moodle.org',
* 'qa' => ''http://qa.moodle.net'
* ));
* </code>
*
* @param array $keyvaluearray An array of key => value pairs to send to the cache.
* @return int The number of items successfully set. It is up to the developer to check this matches the number of items.
* ... if they care that is.
*/
public function set_many(array $keyvaluearray)
{
if ($this->loader !== false) {
// We have a loader available set it there as well.
// We have to let the loader do its own parsing of data as it may be unique.
$this->loader->set_many($keyvaluearray);
}
$data = array();
$simulatettl = $this->has_a_ttl() && !$this->store_supports_native_ttl();
$usestaticaccelerationarray = $this->use_static_acceleration();
foreach ($keyvaluearray as $key => $value) {
if (is_object($value) && $value instanceof cacheable_object) {
$value = new cache_cached_object($value);
} else {
if (!is_scalar($value)) {
// If data is an object it will be a reference.
// If data is an array if may contain references.
// We want to break references so that the cache cannot be modified outside of itself.
// Call the function to unreference it (in the best way possible).
$value = $this->unref($value);
}
}
if ($simulatettl) {
$value = new cache_ttl_wrapper($value, $this->definition->get_ttl());
}
$data[$key] = array('key' => $this->parse_key($key), 'value' => $value);
if ($usestaticaccelerationarray) {
$this->static_acceleration_set($data[$key]['key'], $value);
}
}
if ($this->perfdebug) {
cache_helper::record_cache_set($this->storetype, $this->definition->get_id());
}
return $this->store->set_many($data);
}