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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Tango.FSE.BL
{
/// <summary>
/// Represents an in-memory cache dictionary of type T.
/// </summary>
/// <typeparam name="TValue"></typeparam>
/// <seealso cref="Tango.FSE.BL.IMemoryCacheDictionary" />
public class MemoryCacheDictionary<TKey, TValue> : IMemoryCacheDictionary where TValue : class
{
private ConcurrentDictionary<TKey, TValue> _dictionary;
/// <summary>
/// Gets the cache name.
/// </summary>
public String Name { get; private set; }
/// <summary>
/// Gets the count of items.
/// </summary>
public int Count
{
get { return _dictionary.Count; }
}
/// <summary>
/// Initializes a new instance of the <see cref="MemoryCacheDictionary{T}"/> class.
/// </summary>
/// <param name="name">The name of the cache.</param>
public MemoryCacheDictionary(String name)
{
Name = name;
_dictionary = new ConcurrentDictionary<TKey, TValue>();
}
/// <summary>
/// Determines whether this cache contains an element with the specified key.
/// </summary>
/// <param name="key">The key.</param>
public bool ContainsKey(TKey key)
{
return _dictionary.ContainsKey(key);
}
/// <summary>
/// Gets a cached item by the specified key.
/// </summary>
/// <param name="key">The key.</param>
/// <param name="throwIfNotFound">if set to <c>true</c> throws exception when item not found otherwise returns null.</param>
/// <exception cref="KeyNotFoundException"></exception>
public TValue Get(TKey key, bool throwIfNotFound = true)
{
TValue value = null;
if (_dictionary.TryGetValue(key, out value))
{
return value;
}
else
{
if (throwIfNotFound)
{
throw new KeyNotFoundException($"Could not locate key '{key}' on cache '{Name}'.");
}
else
{
return null;
}
}
}
/// <summary>
/// Puts a new cached item or overrides an existing one.
/// </summary>
/// <param name="key">The key.</param>
/// <param name="value">The value.</param>
public void Put(TKey key, TValue value)
{
_dictionary[key] = value;
}
/// <summary>
/// Get all cached items as a list.
/// </summary>
/// <returns></returns>
public List<TValue> ToList(bool throwOnEmpty = false)
{
var list = _dictionary.Select(x => x.Value).ToList();
if (throwOnEmpty && list.Count == 0)
{
throw new KeyNotFoundException("The memory cache does not contain any items.");
}
return list;
}
/// <summary>
/// Clears this all items from cache.
/// </summary>
public void Clear()
{
_dictionary.Clear();
}
}
/// <summary>
/// Represents an in-memory cache dictionary of type T.
/// </summary>
/// <typeparam name="TValue"></typeparam>
/// <seealso cref="Tango.FSE.BL.IMemoryCacheDictionary" />
public class MemoryCacheDoubleKeyDictionary<TKey1, TKey2, TValue> : IMemoryCacheDictionary where TValue : class
{
private ConcurrentDictionary<String, TValue> _dictionary;
/// <summary>
/// Gets the cache name.
/// </summary>
public String Name { get; private set; }
/// <summary>
/// Gets the count of items.
/// </summary>
public int Count
{
get { return _dictionary.Count; }
}
/// <summary>
/// Initializes a new instance of the <see cref="MemoryCacheDictionary{T}"/> class.
/// </summary>
/// <param name="name">The name of the cache.</param>
public MemoryCacheDoubleKeyDictionary(String name)
{
Name = name;
_dictionary = new ConcurrentDictionary<String, TValue>();
}
/// <summary>
/// Determines whether this cache contains an element with the specified keys.
/// </summary>
/// <param name="key1">The first key.</param>
/// <param name="key2">The second key.</param>
public bool ContainsKey(TKey1 key1, TKey2 key2)
{
return _dictionary.ContainsKey(key1.ToString() + key2.ToString());
}
/// <summary>
/// Gets a cached item by the specified keys.
/// </summary>
/// <param name="key1">The first key.</param>
/// <param name="key2">The second key.</param>
/// <param name="throwIfNotFound">if set to <c>true</c> throws exception when item not found otherwise returns null.</param>
/// <exception cref="KeyNotFoundException"></exception>
public TValue Get(TKey1 key1, TKey2 key2, bool throwIfNotFound = true)
{
TValue value = null;
if (_dictionary.TryGetValue(key1.ToString() + key2.ToString(), out value))
{
return value;
}
else
{
if (throwIfNotFound)
{
throw new KeyNotFoundException($"Could not locate key '{key1 + " " + key2}' on cache '{Name}'.");
}
else
{
return null;
}
}
}
/// <summary>
/// Puts a new cached item or overrides an existing one.
/// </summary>
/// <param name="key1">The first key.</param>
/// <param name="key2">The second key.</param>
/// <param name="value">The value.</param>
public void Put(TKey1 key1, TKey2 key2, TValue value)
{
_dictionary[key1.ToString() + key2.ToString()] = value;
}
/// <summary>
/// Get all cached items as a list.
/// </summary>
/// <returns></returns>
public List<TValue> ToList(bool throwOnEmpty = false)
{
var list = _dictionary.Select(x => x.Value).ToList();
if (throwOnEmpty && list.Count == 0)
{
throw new KeyNotFoundException("The memory cache does not contain any items.");
}
return list;
}
/// <summary>
/// Clears this all items from cache.
/// </summary>
public void Clear()
{
_dictionary.Clear();
}
}
}
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