package org.apache.cassandra.cache;
/*
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  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 java.util.Set;

/**
 * This is similar to the Map interface, but requires maintaining a given capacity
 * and does not require put or remove to return values, which lets SerializingCache
 * be more efficient by avoiding deserialize except on get.
 */
public interface ICache<K, V>
{
    public int capacity();

    public void setCapacity(int capacity);

    public void put(K key, V value);

    public V get(K key);

    public void remove(K key);

    public int size();

    public void clear();

    public Set<K> keySet();

    public Set<K> hotKeySet(int n);

    /**
     * @return true if the cache implementation inherently copies the cached values; otherwise,
     * the caller should copy manually before caching shared values like Thrift ByteBuffers.
     */
    public boolean isPutCopying();
}
