5 // Copyright (c) 2007-2008 Jiri Moudry, Pascal Craponne
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7 // Permission is hereby granted, free of charge, to any person obtaining a copy
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8 // of this software and associated documentation files (the "Software"), to deal
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9 // in the Software without restriction, including without limitation the rights
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10 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 // copies of the Software, and to permit persons to whom the Software is
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12 // furnished to do so, subject to the following conditions:
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14 // The above copyright notice and this permission notice shall be included in
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15 // all copies or substantial portions of the Software.
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17 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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28 using System.Collections.Generic;
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32 namespace DbLinq.Data.Linq.Sugar.Implementation
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34 internal class QueryCache : IQueryCache
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36 private class TableReaderSignature
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38 private readonly Type tableType;
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39 private readonly IList<string> columns;
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40 private readonly int hash;
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42 public override bool Equals(object obj)
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44 var trs = (TableReaderSignature)obj;
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45 if (trs.tableType != tableType)
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47 return trs.columns.SequenceEqual(columns);
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50 public override int GetHashCode()
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55 public TableReaderSignature(Type tableType, IList<string> columns)
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57 this.tableType = tableType;
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58 this.columns = columns;
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59 hash = tableType.GetHashCode();
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60 foreach (var column in columns)
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61 hash ^= column.GetHashCode();
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65 private readonly IThreadSafeDictionary<ExpressionChain, SelectQuery> selectQueries = new ThreadSafeDictionary<ExpressionChain, SelectQuery>((IEqualityComparer<ExpressionChain>)new ExpressionChainEqualityComparer());
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66 private readonly IThreadSafeDictionary<TableReaderSignature, Delegate> tableReaders = new ThreadSafeDictionary<TableReaderSignature, Delegate>();
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68 public SelectQuery GetFromSelectCache(ExpressionChain expressions)
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70 SelectQuery selectQuery;
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71 selectQueries.TryGetValue(expressions, out selectQuery);
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75 public void SetInSelectCache(ExpressionChain expressions, SelectQuery sqlSelectQuery)
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77 selectQueries.MergeSafe(expressions, sqlSelectQuery);
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80 public Delegate GetFromTableReaderCache(Type tableType, IList<string> columns)
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82 var signature = new TableReaderSignature(tableType, columns);
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83 Delegate tableReader;
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84 tableReaders.TryGetValue(signature, out tableReader);
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88 public void SetInTableReaderCache(Type tableType, IList<string> columns, Delegate tableReader)
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90 var signature = new TableReaderSignature(tableType, columns);
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91 tableReaders.MergeSafe(signature, tableReader);
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