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/*
* 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;
namespace Lucene.Net.Util.Cache
{
/// <summary> Base class for cache implementations.</summary>
public abstract class Cache<TKey, TValue> : IDisposable
{
/// <summary> Simple Cache wrapper that synchronizes all
/// calls that access the cache.
/// </summary>
internal class SynchronizedCache_Renamed_Class : Cache<TKey, TValue>
{
internal System.Object mutex;
internal Cache<TKey,TValue> cache;
internal SynchronizedCache_Renamed_Class(Cache<TKey, TValue> cache)
{
this.cache = cache;
this.mutex = this;
}
internal SynchronizedCache_Renamed_Class(Cache<TKey, TValue> cache, System.Object mutex)
{
this.cache = cache;
this.mutex = mutex;
}
public override void Put(TKey key, TValue value_Renamed)
{
lock (mutex)
{
cache.Put(key, value_Renamed);
}
}
public override TValue Get(System.Object key)
{
lock (mutex)
{
return cache.Get(key);
}
}
public override bool ContainsKey(System.Object key)
{
lock (mutex)
{
return cache.ContainsKey(key);
}
}
protected override void Dispose(bool disposing)
{
lock (mutex)
{
cache.Dispose();
}
}
internal override Cache<TKey,TValue> GetSynchronizedCache()
{
return this;
}
}
/// <summary> 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.
/// </summary>
public static Cache<TKey, TValue> SynchronizedCache(Cache<TKey, TValue> cache)
{
return cache.GetSynchronizedCache();
}
/// <summary> Called by <see cref="SynchronizedCache(Cache{TKey,TValue})" />. This method
/// returns a <see cref="SynchronizedCache" /> instance that wraps
/// this instance by default and can be overridden to return
/// e. g. subclasses of <see cref="SynchronizedCache" /> or this
/// in case this cache is already synchronized.
/// </summary>
internal virtual Cache<TKey, TValue> GetSynchronizedCache()
{
return new SynchronizedCache_Renamed_Class(this);
}
/// <summary> Puts a (key, value)-pair into the cache. </summary>
public abstract void Put(TKey key, TValue value_Renamed);
/// <summary> Returns the value for the given key. </summary>
public abstract TValue Get(System.Object key);
/// <summary> Returns whether the given key is in this cache. </summary>
public abstract bool ContainsKey(System.Object key);
/// <summary> Closes the cache.</summary>
[Obsolete("Use Dispose() instead")]
public void Close()
{
Dispose();
}
public void Dispose()
{
Dispose(true);
}
protected abstract void Dispose(bool disposing);
}
}
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