tom | a708318 | 2014-09-25 21:38:03 -0700 | [diff] [blame] | 1 | package org.onlab.nio; |
| 2 | |
| 3 | import java.nio.ByteBuffer; |
| 4 | import java.nio.channels.ByteChannel; |
| 5 | |
| 6 | /** |
| 7 | * Fixed-length message transfer buffer. |
| 8 | */ |
| 9 | public class TestMessageStream extends MessageStream<TestMessage> { |
| 10 | |
| 11 | private static final String E_WRONG_LEN = "Illegal message length: "; |
| 12 | |
| 13 | private final int length; |
| 14 | |
| 15 | /** |
| 16 | * Create a new buffer for transferring messages of the specified length. |
| 17 | * |
| 18 | * @param length message length |
| 19 | * @param ch backing channel |
| 20 | * @param loop driver loop |
| 21 | */ |
| 22 | public TestMessageStream(int length, ByteChannel ch, |
| 23 | IOLoop<TestMessage, ?> loop) { |
| 24 | super(loop, ch, 64 * 1024, 500); |
| 25 | this.length = length; |
| 26 | } |
| 27 | |
| 28 | @Override |
| 29 | protected TestMessage read(ByteBuffer rb) { |
| 30 | if (rb.remaining() < length) { |
| 31 | return null; |
| 32 | } |
| 33 | TestMessage message = new TestMessage(length); |
| 34 | rb.get(message.data()); |
| 35 | return message; |
| 36 | } |
| 37 | |
| 38 | /** |
| 39 | * {@inheritDoc} |
| 40 | * <p/> |
| 41 | * This implementation enforces the message length against the buffer |
| 42 | * supported length. |
| 43 | * |
| 44 | * @throws IllegalArgumentException if message size does not match the |
| 45 | * supported buffer size |
| 46 | */ |
| 47 | @Override |
| 48 | protected void write(TestMessage message, ByteBuffer wb) { |
| 49 | if (message.length() != length) { |
| 50 | throw new IllegalArgumentException(E_WRONG_LEN + message.length()); |
| 51 | } |
| 52 | wb.put(message.data()); |
| 53 | } |
| 54 | |
| 55 | } |