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namespace GMap
.NET.Internals
{
using System.Collections.Generic;
using System.IO;
using System;
using System.Diagnostics;
/// <summary>
/// kiber speed memory cache for tiles with history support ;}
/// </summary>
internal class KiberTileCache
: Dictionary
<RawTile,
byte[]>
{
public KiberTileCache
() : base(new RawTileComparer
())
{
}
readonly Queue
<RawTile
> Queue
= new Queue
<RawTile
>();
/// <summary>
/// the amount of tiles in MB to keep in memmory, default: 22MB, if each ~100Kb it's ~222 tiles
/// </summary>
#if !PocketPC
public int MemoryCacheCapacity
= 22;
#else
public int MemoryCacheCapacity
= 3;
#endif
long memoryCacheSize
= 0;
/// <summary>
/// current memmory cache size in MB
/// </summary>
public double MemoryCacheSize
{
get
{
return memoryCacheSize
/ 1048576.0;
}
}
public new void Add(RawTile key,
byte[] value)
{
Queue
.Enqueue(key
);
base.Add(key,
value);
memoryCacheSize
+= value.Length;
}
// do not allow directly removal of elements
private new void Remove(RawTile key
)
{
}
public new void Clear
()
{
Queue
.Clear();
base.Clear();
memoryCacheSize
= 0;
}
internal void RemoveMemoryOverload
()
{
while(MemoryCacheSize
> MemoryCacheCapacity
)
{
if(Keys
.Count > 0 && Queue
.Count > 0)
{
RawTile first
= Queue
.Dequeue();
try
{
var m
= base[first
];
{
base.Remove(first
);
memoryCacheSize
-= m
.Length;
}
m
= null;
}
catch(Exception ex
)
{
Debug
.WriteLine("RemoveMemoryOverload: " + ex
);
}
}
else
{
break;
}
}
}
}
}