001package org.eclipse.aether;
002
003/*
004 * Licensed to the Apache Software Foundation (ASF) under one
005 * or more contributor license agreements.  See the NOTICE file
006 * distributed with this work for additional information
007 * regarding copyright ownership.  The ASF licenses this file
008 * to you under the Apache License, Version 2.0 (the
009 * "License"); you may not use this file except in compliance
010 * with the License.  You may obtain a copy of the License at
011 * 
012 *  http://www.apache.org/licenses/LICENSE-2.0
013 * 
014 * Unless required by applicable law or agreed to in writing,
015 * software distributed under the License is distributed on an
016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017 * KIND, either express or implied.  See the License for the
018 * specific language governing permissions and limitations
019 * under the License.
020 */
021
022import java.util.Map;
023import java.util.concurrent.ConcurrentHashMap;
024
025/**
026 * A simplistic repository cache backed by a thread-safe map. The simplistic nature of this cache makes it only suitable
027 * for use with short-lived repository system sessions where pruning of cache data is not required.
028 */
029public final class DefaultRepositoryCache
030    implements RepositoryCache
031{
032
033    private final Map<Object, Object> cache = new ConcurrentHashMap<Object, Object>( 256 );
034
035    public Object get( RepositorySystemSession session, Object key )
036    {
037        return cache.get( key );
038    }
039
040    public void put( RepositorySystemSession session, Object key, Object data )
041    {
042        if ( data != null )
043        {
044            cache.put( key, data );
045        }
046        else
047        {
048            cache.remove( key );
049        }
050    }
051
052}