/*
* 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.
*/
using System;
using System.Collections.Generic;
namespace Lucene.Net.Util.Cache
{
/// Base class for cache implementations.
public abstract class Cache
{
/// Simple Cache wrapper that synchronizes all
/// calls that access the cache.
///
internal class SynchronizedCache_Renamed_Class:Cache
{
internal System.Object mutex;
internal Cache cache;
internal SynchronizedCache_Renamed_Class(Cache cache)
{
this.cache = cache;
this.mutex = this;
}
internal SynchronizedCache_Renamed_Class(Cache cache, System.Object mutex)
{
this.cache = cache;
this.mutex = mutex;
}
public override void Put(K key, V value_Renamed)
{
lock (mutex)
{
cache.Put(key, value_Renamed);
}
}
public override V Get(K key)
{
lock (mutex)
{
return cache.Get(key);
}
}
public override bool ContainsKey(K key)
{
lock (mutex)
{
return cache.ContainsKey(key);
}
}
public override void Close()
{
lock (mutex)
{
cache.Close();
}
}
internal override Cache GetSynchronizedCache()
{
return this;
}
}
/// Returns a thread-safe cache backed by the specified cache.
/// In order to guarantee thread-safety, all access to the backed cache must
/// be accomplished through the returned cache.
///
public static Cache SynchronizedCache(Cache cache)
{
return cache.GetSynchronizedCache();
}
/// Called by {@link #SynchronizedCache(Cache)}. This method
/// returns a {@link SynchronizedCache} instance that wraps
/// this instance by default and can be overridden to return
/// e. g. subclasses of {@link SynchronizedCache} or this
/// in case this cache is already synchronized.
///
internal virtual Cache GetSynchronizedCache()
{
return new SynchronizedCache_Renamed_Class(this);
}
/// Puts a (key, value)-pair into the cache.
public abstract void Put(K key, V value_Renamed);
/// Returns the value for the given key.
public abstract V Get(K key);
/// Returns whether the given key is in this cache.
public abstract bool ContainsKey(K key);
/// Closes the cache.
public abstract void Close();
}
}