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  1: <?php
  2: 
  3: /**
  4:  * This file is part of the Nette Framework (http://nette.org)
  5:  * Copyright (c) 2004 David Grudl (http://davidgrudl.com)
  6:  */
  7: 
  8: namespace Nette\Caching;
  9: 
 10: use Nette,
 11:     Nette\Utils\Callback;
 12: 
 13: 
 14: /**
 15:  * Implements the cache for a application.
 16:  *
 17:  * @author     David Grudl
 18:  *
 19:  * @property-read IStorage $storage
 20:  * @property-read string $namespace
 21:  */
 22: class Cache extends Nette\Object implements \ArrayAccess
 23: {
 24:     /** dependency */
 25:     const PRIORITY = 'priority',
 26:         EXPIRATION = 'expire',
 27:         EXPIRE = 'expire',
 28:         SLIDING = 'sliding',
 29:         TAGS = 'tags',
 30:         FILES = 'files',
 31:         ITEMS = 'items',
 32:         CONSTS = 'consts',
 33:         CALLBACKS = 'callbacks',
 34:         ALL = 'all';
 35: 
 36:     /** @internal */
 37:     const NAMESPACE_SEPARATOR = "\x00";
 38: 
 39:     /** @var IStorage */
 40:     private $storage;
 41: 
 42:     /** @var string */
 43:     private $namespace;
 44: 
 45:     /** @var string  last query cache used by offsetGet() */
 46:     private $key;
 47: 
 48:     /** @var mixed  last query cache used by offsetGet()  */
 49:     private $data;
 50: 
 51: 
 52:     public function __construct(IStorage $storage, $namespace = NULL)
 53:     {
 54:         $this->storage = $storage;
 55:         $this->namespace = $namespace . self::NAMESPACE_SEPARATOR;
 56:     }
 57: 
 58: 
 59:     /**
 60:      * Returns cache storage.
 61:      * @return IStorage
 62:      */
 63:     public function getStorage()
 64:     {
 65:         return $this->storage;
 66:     }
 67: 
 68: 
 69:     /**
 70:      * Returns cache namespace.
 71:      * @return string
 72:      */
 73:     public function getNamespace()
 74:     {
 75:         return (string) substr($this->namespace, 0, -1);
 76:     }
 77: 
 78: 
 79:     /**
 80:      * Returns new nested cache object.
 81:      * @param  string
 82:      * @return Cache
 83:      */
 84:     public function derive($namespace)
 85:     {
 86:         $derived = new static($this->storage, $this->namespace . $namespace);
 87:         return $derived;
 88:     }
 89: 
 90: 
 91:     /**
 92:      * Reads the specified item from the cache or generate it.
 93:      * @param  mixed key
 94:      * @param  callable
 95:      * @return mixed|NULL
 96:      */
 97:     public function load($key, $fallback = NULL)
 98:     {
 99:         $data = $this->storage->read($this->generateKey($key));
100:         if ($data === NULL && $fallback) {
101:             return $this->save($key, Callback::closure($fallback));
102:         }
103:         return $data;
104:     }
105: 
106: 
107:     /**
108:      * Writes item into the cache.
109:      * Dependencies are:
110:      * - Cache::PRIORITY => (int) priority
111:      * - Cache::EXPIRATION => (timestamp) expiration
112:      * - Cache::SLIDING => (bool) use sliding expiration?
113:      * - Cache::TAGS => (array) tags
114:      * - Cache::FILES => (array|string) file names
115:      * - Cache::ITEMS => (array|string) cache items
116:      * - Cache::CONSTS => (array|string) cache items
117:      *
118:      * @param  mixed  key
119:      * @param  mixed  value
120:      * @param  array  dependencies
121:      * @return mixed  value itself
122:      * @throws Nette\InvalidArgumentException
123:      */
124:     public function save($key, $data, array $dependencies = NULL)
125:     {
126:         $this->release();
127:         $key = $this->generateKey($key);
128: 
129:         if ($data instanceof Nette\Callback || $data instanceof \Closure) {
130:             $this->storage->lock($key);
131:             $data = call_user_func_array($data, array(& $dependencies));
132:         }
133: 
134:         if ($data === NULL) {
135:             $this->storage->remove($key);
136:         } else {
137:             $this->storage->write($key, $data, $this->completeDependencies($dependencies, $data));
138:             return $data;
139:         }
140:     }
141: 
142: 
143:     private function completeDependencies($dp, $data)
144:     {
145:         // convert expire into relative amount of seconds
146:         if (isset($dp[Cache::EXPIRATION])) {
147:             $dp[Cache::EXPIRATION] = Nette\Utils\DateTime::from($dp[Cache::EXPIRATION])->format('U') - time();
148:         }
149: 
150:         // convert FILES into CALLBACKS
151:         if (isset($dp[self::FILES])) {
152:             foreach (array_unique((array) $dp[self::FILES]) as $item) {
153:                 $dp[self::CALLBACKS][] = array(array(__CLASS__, 'checkFile'), $item, @filemtime($item)); // @ - stat may fail
154:             }
155:             unset($dp[self::FILES]);
156:         }
157: 
158:         // add namespaces to items
159:         if (isset($dp[self::ITEMS])) {
160:             $dp[self::ITEMS] = array_unique(array_map(array($this, 'generateKey'), (array) $dp[self::ITEMS]));
161:         }
162: 
163:         // convert CONSTS into CALLBACKS
164:         if (isset($dp[self::CONSTS])) {
165:             foreach (array_unique((array) $dp[self::CONSTS]) as $item) {
166:                 $dp[self::CALLBACKS][] = array(array(__CLASS__, 'checkConst'), $item, constant($item));
167:             }
168:             unset($dp[self::CONSTS]);
169:         }
170: 
171:         if (!is_array($dp)) {
172:             $dp = array();
173:         }
174:         return $dp;
175:     }
176: 
177: 
178:     /**
179:      * Removes item from the cache.
180:      * @param  mixed  key
181:      * @return void
182:      */
183:     public function remove($key)
184:     {
185:         $this->save($key, NULL);
186:     }
187: 
188: 
189:     /**
190:      * Removes items from the cache by conditions.
191:      * Conditions are:
192:      * - Cache::PRIORITY => (int) priority
193:      * - Cache::TAGS => (array) tags
194:      * - Cache::ALL => TRUE
195:      * @return void
196:      */
197:     public function clean(array $conditions = NULL)
198:     {
199:         $this->release();
200:         $this->storage->clean((array) $conditions);
201:     }
202: 
203: 
204:     /**
205:      * Caches results of function/method calls.
206:      * @param  mixed
207:      * @return mixed
208:      */
209:     public function call($function)
210:     {
211:         $key = func_get_args();
212:         $key[0] = Callback::toReflection($function);
213:         return $this->load($key, function() use ($function, $key) {
214:             return Callback::invokeArgs($function, array_slice($key, 1));
215:         });
216:     }
217: 
218: 
219:     /**
220:      * Caches results of function/method calls.
221:      * @param  mixed
222:      * @param  array  dependencies
223:      * @return \Closure
224:      */
225:     public function wrap($function, array $dependencies = NULL)
226:     {
227:         $cache = $this;
228:         return function() use ($cache, $function, $dependencies) {
229:             $key = array(Callback::toReflection($function), func_get_args());
230:             $data = $cache->load($key);
231:             if ($data === NULL) {
232:                 $data = $cache->save($key, Callback::invokeArgs($function, $key[1]), $dependencies);
233:             }
234:             return $data;
235:         };
236:     }
237: 
238: 
239:     /**
240:      * Starts the output cache.
241:      * @param  mixed  key
242:      * @return OutputHelper|NULL
243:      */
244:     public function start($key)
245:     {
246:         $data = $this->load($key);
247:         if ($data === NULL) {
248:             return new OutputHelper($this, $key);
249:         }
250:         echo $data;
251:     }
252: 
253: 
254:     /**
255:      * Generates internal cache key.
256:      *
257:      * @param  string
258:      * @return string
259:      */
260:     protected function generateKey($key)
261:     {
262:         return $this->namespace . md5(is_scalar($key) ? $key : serialize($key));
263:     }
264: 
265: 
266:     /********************* interface ArrayAccess ****************d*g**/
267: 
268: 
269:     /**
270:      * @deprecated
271:      */
272:     public function offsetSet($key, $data)
273:     {
274:         $this->save($key, $data);
275:     }
276: 
277: 
278:     /**
279:      * @deprecated
280:      */
281:     public function offsetGet($key)
282:     {
283:         $key = is_scalar($key) ? (string) $key : serialize($key);
284:         if ($this->key !== $key) {
285:             $this->key = $key;
286:             $this->data = $this->load($key);
287:         }
288:         return $this->data;
289:     }
290: 
291: 
292:     /**
293:      * @deprecated
294:      */
295:     public function offsetExists($key)
296:     {
297:         $this->release();
298:         return $this->offsetGet($key) !== NULL;
299:     }
300: 
301: 
302:     /**
303:      * @deprecated
304:      */
305:     public function offsetUnset($key)
306:     {
307:         $this->save($key, NULL);
308:     }
309: 
310: 
311:     /**
312:      * @deprecated
313:      */
314:     public function release()
315:     {
316:         $this->key = $this->data = NULL;
317:     }
318: 
319: 
320:     /********************* dependency checkers ****************d*g**/
321: 
322: 
323:     /**
324:      * Checks CALLBACKS dependencies.
325:      * @param  array
326:      * @return bool
327:      */
328:     public static function checkCallbacks($callbacks)
329:     {
330:         foreach ($callbacks as $callback) {
331:             if (!call_user_func_array(array_shift($callback), $callback)) {
332:                 return FALSE;
333:             }
334:         }
335:         return TRUE;
336:     }
337: 
338: 
339:     /**
340:      * Checks CONSTS dependency.
341:      * @param  string
342:      * @param  mixed
343:      * @return bool
344:      */
345:     private static function checkConst($const, $value)
346:     {
347:         return defined($const) && constant($const) === $value;
348:     }
349: 
350: 
351:     /**
352:      * Checks FILES dependency.
353:      * @param  string
354:      * @param  int
355:      * @return bool
356:      */
357:     private static function checkFile($file, $time)
358:     {
359:         return @filemtime($file) == $time; // @ - stat may fail
360:     }
361: 
362: }
363: 
Nette 2.2.6 API API documentation generated by ApiGen 2.8.0