public class LruCache<K, V> {    private final LinkedHashMap<K, V> map;    /** Size of this cache in units. Not necessarily the number of elements. */    private int size;    private int maxSize;    private int putCount;    private int createCount;    private int evictionCount;    private int hitCount;    private int missCount;    /**     * @param maxSize for caches that do not override {@link #sizeOf}, this is     *     the maximum number of entries in the cache. For all other caches,     *     this is the maximum sum of the sizes of the entries in this cache.     */    public LruCache(int maxSize) {        if (maxSize <= 0) {            throw new IllegalArgumentException("maxSize <= 0");        }        this.maxSize = maxSize;        this.map = new LinkedHashMap<K, V>(0, 0.75f, true);    }    /**     * Sets the size of the cache.     *     * @param maxSize The new maximum size.     */    public void resize(int maxSize) {        if (maxSize <= 0) {            throw new IllegalArgumentException("maxSize <= 0");        }        synchronized (this) {            this.maxSize = maxSize;        }        trimToSize(maxSize);    }    /**     * Returns the value for {@code key} if it exists in the cache or can be     * created by {@code #create}. If a value was returned, it is moved to the     * head of the queue. This returns null if a value is not cached and cannot     * be created.     */    public final V get(K key) {        if (key == null) {            throw new NullPointerException("key == null");        }        V mapValue;        synchronized (this) {            mapValue = map.get(key);            if (mapValue != null) {                hitCount++;                return mapValue;            }            missCount++;        }        /*         * Attempt to create a value. This may take a long time, and the map         * may be different when create() returns. If a conflicting value was         * added to the map while create() was working, we leave that value in         * the map and release the created value.         */        V createdValue = create(key);        if (createdValue =http://www.mamicode.com/= null) {            return null;        }        synchronized (this) {            createCount++;            mapValue = map.put(key, createdValue);            if (mapValue != null) {                // There was a conflict so undo that last put                map.put(key, mapValue);            } else {                size += safeSizeOf(key, createdValue);            }        }        if (mapValue != null) {            entryRemoved(false, key, createdValue, mapValue);            return mapValue;        } else {            trimToSize(maxSize);            return createdValue;        }    }    /**     * Caches {@code value} for {@code key}. The value is moved to the head of     * the queue.     *     * @return the previous value mapped by {@code key}.     */    public final V put(K key, V value) {        if (key == null || value =http://www.mamicode.com/= null) {            throw new NullPointerException("key == null || value =http://www.mamicode.com/= null");        }        V previous;        synchronized (this) {            putCount++;            size += safeSizeOf(key, value);            previous = map.put(key, value);            if (previous != null) {                size -= safeSizeOf(key, previous);            }        }        if (previous != null) {            entryRemoved(false, key, previous, value);        }        trimToSize(maxSize);        return previous;    }    /**     * Remove the eldest entries until the total of remaining entries is at or     * below the requested size.     *     * @param maxSize the maximum size of the cache before returning. May be -1     *            to evict even 0-sized elements.     */    public void trimToSize(int maxSize) {        while (true) {            K key;            V value;            synchronized (this) {                if (size < 0 || (map.isEmpty() && size != 0)) {                    throw new IllegalStateException(getClass().getName()                            + ".sizeOf() is reporting inconsistent results!");                }                if (size <= maxSize || map.isEmpty()) {                    break;                }                Map.Entry<K, V> toEvict = map.entrySet().iterator().next();                key = toEvict.getKey();                value = toEvict.getValue();                map.remove(key);                size -= safeSizeOf(key, value);                evictionCount++;            }            entryRemoved(true, key, value, null);        }    }    /**     * Removes the entry for {@code key} if it exists.     *     * @return the previous value mapped by {@code key}.     */    public final V remove(K key) {        if (key == null) {            throw new NullPointerException("key == null");        }        V previous;        synchronized (this) {            previous = map.remove(key);            if (previous != null) {                size -= safeSizeOf(key, previous);            }        }        if (previous != null) {            entryRemoved(false, key, previous, null);        }        return previous;    }    /**     * Called for entries that have been evicted or removed. This method is     * invoked when a value is evicted to make space, removed by a call to     * {@link #remove}, or replaced by a call to {@link #put}. The default     * implementation does nothing.     *     * <p>The method is called without synchronization: other threads may     * access the cache while this method is executing.     *     * @param evicted true if the entry is being removed to make space, false     *     if the removal was caused by a {@link #put} or {@link #remove}.     * @param newValue the new value for {@code key}, if it exists. If non-null,     *     this removal was caused by a {@link #put}. Otherwise it was caused by     *     an eviction or a {@link #remove}.     */    protected void entryRemoved(boolean evicted, K key, V oldValue, V newValue) {}    /**     * Called after a cache miss to compute a value for the corresponding key.     * Returns the computed value or null if no value can be computed. The     * default implementation returns null.     *     * <p>The method is called without synchronization: other threads may     * access the cache while this method is executing.     *     * <p>If a value for {@code key} exists in the cache when this method     * returns, the created value will be released with {@link #entryRemoved}     * and discarded. This can occur when multiple threads request the same key     * at the same time (causing multiple values to be created), or when one     * thread calls {@link #put} while another is creating a value for the same     * key.     */    protected V create(K key) {        return null;    }    private int safeSizeOf(K key, V value) {        int result = sizeOf(key, value);        if (result < 0) {            throw new IllegalStateException("Negative size: " + key + "=" + value);        }        return result;    }    /**     * Returns the size of the entry for {@code key} and {@code value} in     * user-defined units.  The default implementation returns 1 so that size     * is the number of entries and max size is the maximum number of entries.     *     * <p>An entry‘s size must not change while it is in the cache.     */    protected int sizeOf(K key, V value) {        return 1;    }    /**     * Clear the cache, calling {@link #entryRemoved} on each removed entry.     */    public final void evictAll() {        trimToSize(-1); // -1 will evict 0-sized elements    }    /**     * For caches that do not override {@link #sizeOf}, this returns the number     * of entries in the cache. For all other caches, this returns the sum of     * the sizes of the entries in this cache.     */    public synchronized final int size() {        return size;    }    /**     * For caches that do not override {@link #sizeOf}, this returns the maximum     * number of entries in the cache. For all other caches, this returns the     * maximum sum of the sizes of the entries in this cache.     */    public synchronized final int maxSize() {        return maxSize;    }    /**     * Returns the number of times {@link #get} returned a value that was     * already present in the cache.     */    public synchronized final int hitCount() {        return hitCount;    }    /**     * Returns the number of times {@link #get} returned null or required a new     * value to be created.     */    public synchronized final int missCount() {        return missCount;    }    /**     * Returns the number of times {@link #create(Object)} returned a value.     */    public synchronized final int createCount() {        return createCount;    }    /**     * Returns the number of times {@link #put} was called.     */    public synchronized final int putCount() {        return putCount;    }    /**     * Returns the number of values that have been evicted.     */    public synchronized final int evictionCount() {        return evictionCount;    }    /**     * Returns a copy of the current contents of the cache, ordered from least     * recently accessed to most recently accessed.     */    public synchronized final Map<K, V> snapshot() {        return new LinkedHashMap<K, V>(map);    }    @Override public synchronized final String toString() {        int accesses = hitCount + missCount;        int hitPercent = accesses != 0 ? (100 * hitCount / accesses) : 0;        return String.format("LruCache[maxSize=%d,hits=%d,misses=%d,hitRate=%d%%]",                maxSize, hitCount, missCount, hitPercent);    }}