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New method Memcached_DataObject::pivotGet()

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This method lets you get all the objects with a given variable key and
another set of "fixed" keys. A good example is getting all the avatars
for a notice list; the avatar size stays the same, but the IDs change.

Since it's very similar to multiGet(), I refactored that function to
use pivotGet().

And, yes, I realize these are kind of hard to follow.
This commit is contained in:
Evan Prodromou 2011-08-02 10:46:29 -04:00
parent 200e18cd71
commit 72ed297214
1 changed files with 46 additions and 15 deletions
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109
classes/Memcached_DataObject.php
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@ -76,46 +76,13 @@ class Memcached_DataObject extends Safe_DataObject
*/ */
function multiGet($cls, $keyCol, $keyVals, $skipNulls=true) function multiGet($cls, $keyCol, $keyVals, $skipNulls=true)
{ {
$result = array_fill_keys($keyVals, null); $result = self::pivotGet($cls, $keyCol, $keyVals);
$toFetch = array(); common_log(LOG_INFO, sprintf("Got %d results for class %s with %d keys on column %s",
count($result),
foreach ($keyVals as $keyVal) { $cls,
$i = self::getcached($cls, $keyCol, $keyVal); count($keyVals),
if ($i !== false) { $keyCol));
$result[$keyVal] = $i;
} else if (!empty($keyVal)) {
$toFetch[] = $keyVal;
}
}
if (count($toFetch) > 0) {
$i = DB_DataObject::factory($cls);
if (empty($i)) {
throw new Exception(_('Cannot instantiate class ' . $cls));
}
$i->whereAddIn($keyCol, $toFetch, $i->columnType($keyCol));
if ($i->find()) {
while ($i->fetch()) {
$copy = clone($i);
$copy->encache();
$result[$i->$keyCol] = $copy;
}
}
// Save state of DB misses
foreach ($toFetch as $keyVal) {
if (empty($result[$keyVal])) {
// save the fact that no such row exists
$c = self::memcache();
if (!empty($c)) {
$ck = self::cachekey($cls, $keyCol, $keyVal);
$c->set($ck, null);
}
}
}
}
$values = array_values($result); $values = array_values($result);
@ -132,6 +99,70 @@ class Memcached_DataObject extends Safe_DataObject
return new ArrayWrapper($values); return new ArrayWrapper($values);
} }
/**
* Get multiple items from the database by key
*
* @param string $cls Class to fetch
* @param string $keyCol name of column for key
* @param array $keyVals key values to fetch
* @param boolean $otherCols Other columns to hold fixed
*
* @return array Array mapping $keyVals to objects, or null if not found
*/
static function pivotGet($cls, $keyCol, $keyVals, $otherCols = array())
{
$result = array_fill_keys($keyVals, null);
$toFetch = array();
foreach ($keyVals as $keyVal) {
$kv = array_merge($otherCols, array($keyCol => $keyVal));
$i = self::multicache($cls, $kv);
if ($i !== false) {
$result[$keyVal] = $i;
} else if (!empty($keyVal)) {
$toFetch[] = $keyVal;
}
}
if (count($toFetch) > 0) {
$i = DB_DataObject::factory($cls);
if (empty($i)) {
throw new Exception(_('Cannot instantiate class ' . $cls));
}
foreach ($otherCols as $otherKeyCol => $otherKeyVal) {
$i->$otherKeyCol = $otherKeyVal;
}
$i->whereAddIn($keyCol, $toFetch, $i->columnType($keyCol));
if ($i->find()) {
while ($i->fetch()) {
$copy = clone($i);
$copy->encache();
$result[$i->$keyCol] = $copy;
}
}
// Save state of DB misses
foreach ($toFetch as $keyVal) {
if (empty($result[$keyVal])) {
$kv = array_merge($otherCols, array($keyCol => $keyVal));
// save the fact that no such row exists
$c = self::memcache();
if (!empty($c)) {
$ck = self::multicacheKey($cls, $keyCol, $keyVal);
$c->set($ck, null);
}
}
}
}
return $result;
}
function columnType($columnName) function columnType($columnName)
{ {
$keys = $this->table(); $keys = $this->table();