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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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61
classes/Memcached_DataObject.php
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@ -75,13 +75,52 @@ class Memcached_DataObject extends Safe_DataObject
* @return array Array of objects, in order * @return array Array of objects, in order
*/ */
function multiGet($cls, $keyCol, $keyVals, $skipNulls=true) function multiGet($cls, $keyCol, $keyVals, $skipNulls=true)
{
$result = self::pivotGet($cls, $keyCol, $keyVals);
common_log(LOG_INFO, sprintf("Got %d results for class %s with %d keys on column %s",
count($result),
$cls,
count($keyVals),
$keyCol));
$values = array_values($result);
if ($skipNulls) {
$tmp = array();
foreach ($values as $value) {
if (!empty($value)) {
$tmp[] = $value;
}
}
$values = $tmp;
}
return new ArrayWrapper($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); $result = array_fill_keys($keyVals, null);
$toFetch = array(); $toFetch = array();
foreach ($keyVals as $keyVal) { foreach ($keyVals as $keyVal) {
$i = self::getcached($cls, $keyCol, $keyVal);
$kv = array_merge($otherCols, array($keyCol => $keyVal));
$i = self::multicache($cls, $kv);
if ($i !== false) { if ($i !== false) {
$result[$keyVal] = $i; $result[$keyVal] = $i;
} else if (!empty($keyVal)) { } else if (!empty($keyVal)) {
@ -93,6 +132,9 @@ class Memcached_DataObject extends Safe_DataObject
$i = DB_DataObject::factory($cls); $i = DB_DataObject::factory($cls);
if (empty($i)) { if (empty($i)) {
throw new Exception(_('Cannot instantiate class ' . $cls)); throw new Exception(_('Cannot instantiate class ' . $cls));
}
foreach ($otherCols as $otherKeyCol => $otherKeyVal) {
$i->$otherKeyCol = $otherKeyVal;
} }
$i->whereAddIn($keyCol, $toFetch, $i->columnType($keyCol)); $i->whereAddIn($keyCol, $toFetch, $i->columnType($keyCol));
if ($i->find()) { if ($i->find()) {
@ -107,29 +149,18 @@ class Memcached_DataObject extends Safe_DataObject
foreach ($toFetch as $keyVal) { foreach ($toFetch as $keyVal) {
if (empty($result[$keyVal])) { if (empty($result[$keyVal])) {
$kv = array_merge($otherCols, array($keyCol => $keyVal));
// save the fact that no such row exists // save the fact that no such row exists
$c = self::memcache(); $c = self::memcache();
if (!empty($c)) { if (!empty($c)) {
$ck = self::cachekey($cls, $keyCol, $keyVal); $ck = self::multicacheKey($cls, $keyCol, $keyVal);
$c->set($ck, null); $c->set($ck, null);
} }
} }
} }
} }
$values = array_values($result); return $result;
if ($skipNulls) {
$tmp = array();
foreach ($values as $value) {
if (!empty($value)) {
$tmp[] = $value;
}
}
$values = $tmp;
}
return new ArrayWrapper($values);
} }
function columnType($columnName) function columnType($columnName)