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| 2287 | - | 1 | |
| 2 | namespace GMap.NET.Internals |
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| 3 | { |
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| 4 | using System.Collections.Generic; |
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| 5 | using System.IO; |
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| 6 | using System; |
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| 7 | using System.Diagnostics; |
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| 8 | |||
| 9 | /// <summary> |
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| 10 | /// kiber speed memory cache for tiles with history support ;} |
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| 11 | /// </summary> |
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| 12 | internal class KiberTileCache : Dictionary<RawTile, byte[]> |
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| 13 | { |
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| 14 | public KiberTileCache() : base(new RawTileComparer()) |
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| 15 | { |
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| 16 | } |
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| 17 | |||
| 18 | readonly Queue<RawTile> Queue = new Queue<RawTile>(); |
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| 19 | |||
| 20 | /// <summary> |
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| 21 | /// the amount of tiles in MB to keep in memmory, default: 22MB, if each ~100Kb it's ~222 tiles |
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| 22 | /// </summary> |
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| 23 | #if !PocketPC |
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| 24 | public int MemoryCacheCapacity = 22; |
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| 25 | #else |
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| 26 | public int MemoryCacheCapacity = 3; |
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| 27 | #endif |
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| 28 | |||
| 29 | long memoryCacheSize = 0; |
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| 30 | |||
| 31 | /// <summary> |
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| 32 | /// current memmory cache size in MB |
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| 33 | /// </summary> |
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| 34 | public double MemoryCacheSize |
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| 35 | { |
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| 36 | get |
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| 37 | { |
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| 38 | return memoryCacheSize / 1048576.0; |
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| 39 | } |
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| 40 | } |
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| 41 | |||
| 42 | public new void Add(RawTile key, byte[] value) |
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| 43 | { |
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| 44 | Queue.Enqueue(key); |
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| 45 | base.Add(key, value); |
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| 46 | |||
| 47 | memoryCacheSize += value.Length; |
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| 48 | } |
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| 49 | |||
| 50 | // do not allow directly removal of elements |
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| 51 | private new void Remove(RawTile key) |
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| 52 | { |
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| 53 | |||
| 54 | } |
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| 55 | |||
| 56 | public new void Clear() |
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| 57 | { |
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| 58 | Queue.Clear(); |
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| 59 | base.Clear(); |
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| 60 | memoryCacheSize = 0; |
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| 61 | } |
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| 62 | |||
| 63 | internal void RemoveMemoryOverload() |
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| 64 | { |
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| 65 | while(MemoryCacheSize > MemoryCacheCapacity) |
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| 66 | { |
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| 67 | if(Keys.Count > 0 && Queue.Count > 0) |
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| 68 | { |
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| 69 | RawTile first = Queue.Dequeue(); |
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| 70 | try |
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| 71 | { |
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| 72 | var m = base[first]; |
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| 73 | { |
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| 74 | base.Remove(first); |
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| 75 | memoryCacheSize -= m.Length; |
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| 76 | } |
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| 77 | m = null; |
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| 78 | } |
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| 79 | catch(Exception ex) |
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| 80 | { |
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| 81 | Debug.WriteLine("RemoveMemoryOverload: " + ex); |
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| 82 | } |
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| 83 | } |
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| 84 | else |
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| 85 | { |
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| 86 | break; |
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| 87 | } |
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| 88 | } |
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| 89 | } |
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| 90 | } |
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| 91 | } |