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2498 | - | 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 | } |