tom | f110fff | 2014-09-26 00:38:18 -0700 | [diff] [blame^] | 1 | package org.onlab.onos.foo; |
| 2 | |
| 3 | import org.onlab.nio.IOLoop; |
| 4 | import org.onlab.nio.MessageStream; |
| 5 | |
| 6 | import java.nio.ByteBuffer; |
| 7 | import java.nio.channels.ByteChannel; |
| 8 | |
| 9 | /** |
| 10 | * Fixed-length message transfer buffer. |
| 11 | */ |
| 12 | public class TestMessageStream extends MessageStream<TestMessage> { |
| 13 | |
| 14 | private static final String E_WRONG_LEN = "Illegal message length: "; |
| 15 | |
| 16 | private final int length; |
| 17 | |
| 18 | /** |
| 19 | * Create a new buffer for transferring messages of the specified length. |
| 20 | * |
| 21 | * @param length message length |
| 22 | * @param ch backing channel |
| 23 | * @param loop driver loop |
| 24 | */ |
| 25 | public TestMessageStream(int length, ByteChannel ch, |
| 26 | IOLoop<TestMessage, ?> loop) { |
| 27 | super(loop, ch, 64 * 1024, 500); |
| 28 | this.length = length; |
| 29 | } |
| 30 | |
| 31 | @Override |
| 32 | protected TestMessage read(ByteBuffer rb) { |
| 33 | if (rb.remaining() < length) { |
| 34 | return null; |
| 35 | } |
| 36 | TestMessage message = new TestMessage(length); |
| 37 | rb.get(message.data()); |
| 38 | return message; |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * {@inheritDoc} |
| 43 | * <p/> |
| 44 | * This implementation enforces the message length against the buffer |
| 45 | * supported length. |
| 46 | * |
| 47 | * @throws IllegalArgumentException if message size does not match the |
| 48 | * supported buffer size |
| 49 | */ |
| 50 | @Override |
| 51 | protected void write(TestMessage message, ByteBuffer wb) { |
| 52 | if (message.length() != length) { |
| 53 | throw new IllegalArgumentException(E_WRONG_LEN + message.length()); |
| 54 | } |
| 55 | wb.put(message.data()); |
| 56 | } |
| 57 | |
| 58 | } |