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1 using System;
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2 using System.Collections.Generic;
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3 using System.Linq.Expressions;
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4
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5 namespace BLToolkit.Data.Linq
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6 {
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7 public class QueryContext
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8 {
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9 public class DataContextContext
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10 {
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11 public IDataContextInfo DataContextInfo;
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12 public bool InUse;
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13 }
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14
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15 public QueryContext(IDataContextInfo dataContext, Expression expr, object[] compiledParameters)
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16 {
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17 RootDataContext = dataContext;
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18 Expression = expr;
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19 CompiledParameters = compiledParameters;
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20 }
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21
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22 public IDataContextInfo RootDataContext;
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23 public Expression Expression;
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24 public object[] CompiledParameters;
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25 public int Counter;
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26
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27 List<DataContextContext> _contexts;
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28
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29 public DataContextContext GetDataContext()
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30 {
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31 if (_contexts == null)
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32 {
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33 RootDataContext.DataContext.OnClosing += OnRootClosing;
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34 _contexts = new List<DataContextContext>(1);
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35 }
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36
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37 foreach (var context in _contexts)
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38 {
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39 if (!context.InUse)
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40 {
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41 context.InUse = true;
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42 return context;
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43 }
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44 }
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45
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46 var ctx = new DataContextContext { DataContextInfo = RootDataContext.Clone(true), InUse = true };
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47
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48 _contexts.Add(ctx);
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49
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50 return ctx;
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51 }
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52
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53 public void ReleaseDataContext(DataContextContext context)
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54 {
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55 context.InUse = false;
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56 }
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57
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58 void OnRootClosing(object sender, EventArgs e)
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59 {
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60 foreach (var context in _contexts)
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61 context.DataContextInfo.DataContext.Dispose();
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62
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63 RootDataContext.DataContext.OnClosing -= OnRootClosing;
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64
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65 _contexts = null;
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66 }
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67
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68 public void AfterQuery()
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69 {
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70 Counter++;
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71 }
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72 }
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73 }
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