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DivinerAtomCache.php
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Tue, Nov 26, 21:59

DivinerAtomCache.php
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<?php
final class DivinerAtomCache {
private $cache;
private $fileHashMap;
private $atomMap;
private $symbolMap;
private $edgeSrcMap;
private $edgeDstMap;
private $graphMap;
private $atoms = array();
private $writeAtoms = array();
public function __construct($cache_directory) {
$dir_cache = id(new PhutilKeyValueCacheDirectory())
->setCacheDirectory($cache_directory);
$profiled_cache = id(new PhutilKeyValueCacheProfiler($dir_cache))
->setProfiler(PhutilServiceProfiler::getInstance())
->setName('diviner-atom-cache');
$this->cache = $profiled_cache;
}
private function getCache() {
return $this->cache;
}
public function delete() {
$this->getCache()->destroyCache();
$this->fileHashMap = null;
$this->atomMap = null;
$this->atoms = array();
return $this;
}
/**
* Convert a long-form hash key like `ccbbaaaaaaaaaaaaaaaaaaaaaaaaaaaaN` into
* a shortened directory form, like `cc/bb/aaaaaaaaN`. In conjunction with
* @{class:PhutilKeyValueCacheDirectory}, this gives us nice directories
* inside .divinercache instead of a million hash files with huge names at
* top level.
*/
private function getHashKey($hash) {
return implode(
'/',
array(
substr($hash, 0, 2),
substr($hash, 2, 2),
substr($hash, 4, 8),
));
}
/* -( File Hash Map )------------------------------------------------------ */
public function getFileHashMap() {
if ($this->fileHashMap === null) {
$this->fileHashMap = $this->getCache()->getKey('file', array());
}
return $this->fileHashMap;
}
public function addFileHash($file_hash, $atom_hash) {
$this->getFileHashMap();
$this->fileHashMap[$file_hash] = $atom_hash;
return $this;
}
public function fileHashExists($file_hash) {
$map = $this->getFileHashMap();
return isset($map[$file_hash]);
}
public function deleteFileHash($file_hash) {
if ($this->fileHashExists($file_hash)) {
$map = $this->getFileHashMap();
$atom_hash = $map[$file_hash];
unset($this->fileHashMap[$file_hash]);
$this->deleteAtomHash($atom_hash);
}
return $this;
}
/* -( Atom Map )----------------------------------------------------------- */
public function getAtomMap() {
if ($this->atomMap === null) {
$this->atomMap = $this->getCache()->getKey('atom', array());
}
return $this->atomMap;
}
public function getAtom($atom_hash) {
if (!array_key_exists($atom_hash, $this->atoms)) {
$key = 'atom/'.$this->getHashKey($atom_hash);
$this->atoms[$atom_hash] = $this->getCache()->getKey($key);
}
return $this->atoms[$atom_hash];
}
public function addAtom(array $atom) {
$hash = $atom['hash'];
$this->atoms[$hash] = $atom;
$this->getAtomMap();
$this->atomMap[$hash] = true;
$this->writeAtoms['atom/'.$this->getHashKey($hash)] = $atom;
return $this;
}
public function deleteAtomHash($atom_hash) {
$atom = $this->getAtom($atom_hash);
if ($atom) {
foreach ($atom['childHashes'] as $child_hash) {
$this->deleteAtomHash($child_hash);
}
}
$this->getAtomMap();
unset($this->atomMap[$atom_hash]);
unset($this->writeAtoms[$atom_hash]);
$this->getCache()->deleteKey('atom/'.$this->getHashKey($atom_hash));
return $this;
}
public function saveAtoms() {
$this->getCache()->setKeys(
array(
'file' => $this->getFileHashMap(),
'atom' => $this->getAtomMap(),
) + $this->writeAtoms);
$this->writeAtoms = array();
return $this;
}
/* -( Symbol Hash Map )---------------------------------------------------- */
public function getSymbolMap() {
if ($this->symbolMap === null) {
$this->symbolMap = $this->getCache()->getKey('symbol', array());
}
return $this->symbolMap;
}
public function addSymbol($atom_hash, $symbol_hash) {
$this->getSymbolMap();
$this->symbolMap[$atom_hash] = $symbol_hash;
return $this;
}
public function deleteSymbol($atom_hash) {
$this->getSymbolMap();
unset($this->symbolMap[$atom_hash]);
return $this;
}
public function saveSymbols() {
$this->getCache()->setKeys(
array(
'symbol' => $this->getSymbolMap(),
));
return $this;
}
/* -( Edge Map )----------------------------------------------------------- */
public function getEdgeMap() {
if ($this->edgeDstMap === null) {
$this->edgeDstMap = $this->getCache()->getKey('edge', array());
$this->edgeSrcMap = array();
foreach ($this->edgeDstMap as $dst => $srcs) {
foreach ($srcs as $src => $ignored) {
$this->edgeSrcMap[$src][$dst] = true;
}
}
}
return $this->edgeDstMap;
}
public function getEdgesWithDestination($symbol_hash) {
$this->getEdgeMap();
return array_keys(idx($this->edgeDstMap, $symbol_hash, array()));
}
public function addEdges($node_hash, array $symbol_hash_list) {
$this->getEdgeMap();
$this->edgeSrcMap[$node_hash] = array_fill_keys($symbol_hash_list, true);
foreach ($symbol_hash_list as $symbol_hash) {
$this->edgeDstMap[$symbol_hash][$node_hash] = true;
}
return $this;
}
public function deleteEdges($node_hash) {
$this->getEdgeMap();
foreach (idx($this->edgeSrcMap, $node_hash, array()) as $dst => $ignored) {
unset($this->edgeDstMap[$dst][$node_hash]);
if (empty($this->edgeDstMap[$dst])) {
unset($this->edgeDstMap[$dst]);
}
}
unset($this->edgeSrcMap[$node_hash]);
return $this;
}
public function saveEdges() {
$this->getCache()->setKeys(
array(
'edge' => $this->getEdgeMap(),
));
return $this;
}
/* -( Graph Map )---------------------------------------------------------- */
public function getGraphMap() {
if ($this->graphMap === null) {
$this->graphMap = $this->getCache()->getKey('graph', array());
}
return $this->graphMap;
}
public function deleteGraph($node_hash) {
$this->getGraphMap();
unset($this->graphMap[$node_hash]);
return $this;
}
public function addGraph($node_hash, $graph_hash) {
$this->getGraphMap();
$this->graphMap[$node_hash] = $graph_hash;
return $this;
}
public function saveGraph() {
$this->getCache()->setKeys(
array(
'graph' => $this->getGraphMap(),
));
return $this;
}
}

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