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- /*
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * See the NOTICE file distributed with this work for additional
- * information regarding copyright ownership.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- #import <Foundation/Foundation.h>
- NS_ASSUME_NONNULL_BEGIN
- @interface LRUCache : NSObject
- /*! Maximum cache capacity. Could only be set in the constructor */
- @property (nonatomic, readonly) NSUInteger capacity;
- /**
- Constructs a new LRU cache instance with the given capacity
- @param capacity Maximum cache capacity
- */
- - (instancetype)initWithCapacity:(NSUInteger)capacity;
- /**
- Puts a new object into the cache. nil cannot be stored in the cache.
- @param object Object to put
- @param key Object's key
- */
- - (void)setObject:(id)object forKey:(id<NSCopying>)key;
- /**
- Retrieves an object from the cache. Every time this method is called the matched
- object is bumped in the cache (if exists)
- @param key Object's key
- @returns Either the stored instance or nil if the object does not exist or has expired
- */
- - (nullable id)objectForKey:(id<NSCopying>)key;
- /**
- Retrieves all values from the cache ORDERED by recent bump. No bump is performed
- @return Array of all cache values ordred by recent usage (oldest items are at the tail)
- */
- - (NSArray *)allObjects;
- /**
- Removes the object associated with the specified key from the cache.
- @param key The key identifying the object to remove.
- */
- - (void)removeObjectForKey:(id<NSCopying>)key;
- @end
- NS_ASSUME_NONNULL_END
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