Creating a custom PiecePicker
Version 3 (Alan McGovern, 10/19/2009 09:19 AM)
| 1 | 1 | h1. Creating a custom PiecePicker |
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| 2 | 2 | Alan McGovern | |
| 3 | 3 | Alan McGovern | [[Creating a custom PiecePicker#Example-1|Example 1]] Creating a picker to prioritise the first piece in a file |
| 4 | 1 | ||
| 5 | 1 | h2. Example 1 |
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| 6 | 1 | ||
| 7 | 1 | <pre><code class="java"> |
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| 8 | 1 | public class MyPicker : PiecePicker { |
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| 9 | 1 | public MyPicker (PiecePicker basePicker) |
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| 10 | 1 | : base (basePicker) |
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| 11 | 1 | { |
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| 12 | 1 | ||
| 13 | 1 | } |
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| 14 | 1 | ||
| 15 | 1 | public override MessageBundle PickPiece(PeerId id, BitField peerBitfield, List<PeerId> otherPeers, int count, int startIndex, int endIndex) |
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| 16 | 1 | { |
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| 17 | 1 | // If we do not have the first piece and the other peer does have it |
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| 18 | 1 | if (!HaveFirstPieceAlready && peerBitfield[0] == true) { |
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| 19 | 1 | BitField bf = new BitField (peerBitfield.Length); |
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| 20 | 1 | bf [0] = true; |
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| 21 | 1 | MessageBundle msg = base.PickPiece (id, bf, otherPeers, count, startIndex, endIndex); |
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| 22 | 1 | if (msg != null) |
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| 23 | 1 | return msg; |
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| 24 | 1 | } |
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| 25 | 1 | return base.PickPiece (id, peerBitfield, otherPeers, count, startIndex, endIndex); |
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| 26 | 1 | } |
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| 27 | 1 | } |
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| 28 | 1 | ||
| 29 | 1 | // This picker can then be added to the default picking pipeline by doing: |
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| 30 | 1 | torrentManager.ChangePicker (new MyPicker (torrentManager.CreateDefaultPicker ())); |
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| 31 | 1 | </code></pre> |