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annotate MetroWpf/MetroWpf.Framework/ServiceClient.cs @ 15:060f02cd4591

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author stevenh7776 stevenhollidge@hotmail.com
date Mon, 12 Mar 2012 23:05:21 +0800
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15
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1 using System;
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2 using System.Threading.Tasks;
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3
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4 namespace MetroWpf.Framework
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5 {
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6 public class ServiceClient
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7 {
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8 public static T Execute<T>(
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9 Func<T> func,
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10 int timeoutMilliseconds,
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11 int maxAttempts)
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12 {
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13 T result;
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14 Exception e;
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15 TryExecute(func, timeoutMilliseconds, maxAttempts, out result, out e);
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16 if (e != null) throw e;
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17 return result;
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18 }
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19
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20 public static bool TryExecute<T>(
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21 Func<T> func,
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22 int timeoutMilliseconds,
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23 int maxAttempts,
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24 out T result,
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25 out Exception e)
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26 {
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27 bool isSuccessful = false;
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28 var t = default(T);
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29 e = null;
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30
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31 var task = Task.Factory.StartNew(() =>
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32 {
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33 for (int i = 0; i < maxAttempts; i++)
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34 {
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35 try { t = func(); }
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36 catch { if (i == maxAttempts - 1) { throw; } }
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37 }
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38 });
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39
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40 try
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41 {
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42 task.Wait(timeoutMilliseconds);
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43 if (!task.IsCompleted)
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44 e = new TimeoutException();
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45 else
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46 isSuccessful = true;
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47 }
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48 catch (AggregateException ae)
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49 {
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50 e = ae.InnerException;
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51 }
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52
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53 result = t;
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54 return isSuccessful;
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55 }
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56 }
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57 }