com.phloc.commons.cache.ISimpleCache Maven / Gradle / Ivy
/**
* Copyright (C) 2006-2015 phloc systems
* http://www.phloc.com
* office[at]phloc[dot]com
*
* Licensed 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.
*/
package com.phloc.commons.cache;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import com.phloc.commons.name.IHasName;
import com.phloc.commons.state.EChange;
/**
* Interface for a very simple Map-like cache.
*
* @author Philip Helger
* @param
* Cache key type.
* @param
* Cache value type.
*/
public interface ISimpleCache extends SimpleCacheMBean, IHasName
{
/**
* Get the cached value associated with the passed key.
*
* @param aKey
* The key to be looked up. May be nullable or not -
* depends upon the implementation.
* @return null if no such value is in the cache.
*/
@Nullable
VALUETYPE getFromCache (KEYTYPE aKey);
/**
* Remove the given key from the cache.
*
* @param aKey
* The key to be removed. May be nullable or not - depends
* upon the implementation.
* @return {@link EChange#CHANGED} upon success, {@link EChange#UNCHANGED} if
* the key was not within the cache,
*/
@Nonnull
EChange removeFromCache (KEYTYPE aKey);
}