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annotate Implab/Components/IRunnable.cs @ 259:7d52dc684bbd v3

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PollingComponent: implemented correct stopping
author cin
date Fri, 13 Apr 2018 03:57:39 +0300
parents c52691faaf21
children f1696cdc3d7a
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1 using System;
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2 using System.Threading;
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3 using System.Threading.Tasks;
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5 namespace Implab.Components {
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6 /// <summary>
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7 /// Interface for the component which performs a long running task.
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8 /// </summary>
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9 /// <remarks>
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10 /// The access to the runnable component should be sequential, the
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11 /// componet should support asynchronous completion of the initiated
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12 /// operation but operations itself must be initiated sequentially.
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13 /// </remarks>
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14 public interface IRunnable {
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15 /// <summary>
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16 /// Starts this instance
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17 /// </summary>
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18 /// <remarks>
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19 /// This operation is cancellable and it's expected to move to
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20 /// the failed state or just ignore the cancellation request,
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21 /// </remarks>
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22 void Start(CancellationToken ct);
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23
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24 /// <summary>
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25 /// Stops this instance and releases all resources, after the
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26 /// instance is stopped it is moved to Disposed state and
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27 /// can't be reused.
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28 /// </summary>
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29 /// <remarks>
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30 /// If the componet was in the starting state the pending operation
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31 /// will be requested to cancel. The stop operatin will be
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32 /// performed only if the component in the running state.
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33 /// </remarks>
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34 void Stop(CancellationToken ct);
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35
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36 /// <summary>
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37 /// Current state of the componenet, dynamically reflects the current state.
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38 /// </summary>
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39 ExecutionState State { get; }
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41 /// <summary>
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42 /// Event to monitor the state of the component.
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43 /// </summary>
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44 event EventHandler<StateChangeEventArgs> StateChanged;
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45
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46 /// <summary>
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47 /// The last error
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48 /// </summary>
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49 Exception LastError { get; }
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50 }
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51 }
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