Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/remote/transport/MessageEncoder.java @ 32:243c74d599bf

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author Dan Creswell <dan.creswell@gmail.com>
date Sat, 12 Jun 2010 10:41:47 +0100
parents 3dc0c5604566
children
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1 package org.dancres.blitz.remote.transport;
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2
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3 import java.io.Serializable;
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4 import java.io.NotSerializableException;
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5 import java.io.IOException;
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6
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7 import org.apache.mina.filter.codec.ProtocolEncoderOutput;
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8 import org.apache.mina.filter.codec.ProtocolEncoderAdapter;
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9 import org.apache.mina.common.IoSession;
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10 import org.apache.mina.common.ByteBuffer;
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11
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12 /**
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13 */
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14 public class MessageEncoder extends ProtocolEncoderAdapter {
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15 private int maxObjectSize = MessageCodecFactory.DEFAULT_MAX_OBJECT_SIZE;
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16
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17 /**
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18 * Creates a new instance.
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19 */
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20 public MessageEncoder() {
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21 }
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22
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23 /**
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24 * Returns the allowed maximum size of the encoded object.
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25 * If the size of the encoded object exceeds this value, this encoder
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26 * will throw a {@link IllegalArgumentException}. The default value
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27 * is {@link Integer#MAX_VALUE}.
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28 */
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29 public int getMaxObjectSize() {
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30 return maxObjectSize;
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31 }
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32
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33 /**
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34 * Sets the allowed maximum size of the encoded object.
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35 * If the size of the encoded object exceeds this value, this encoder
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36 * will throw a {@link IllegalArgumentException}. The default value
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37 * is {@link Integer#MAX_VALUE}.
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38 */
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39 public void setMaxObjectSize(int maxObjectSize) {
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40 if (maxObjectSize <= 0) {
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41 throw new IllegalArgumentException(
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42 "maxObjectSize: " + maxObjectSize);
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43 }
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44
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45 this.maxObjectSize = maxObjectSize;
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46 }
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47
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48 public void encode(IoSession session, Object message,
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49 ProtocolEncoderOutput out) throws Exception {
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50 if (!(message instanceof Message)) {
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51 throw new IOException("I'm only good for Messages");
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52 }
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53
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54
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55 Message myMessage = (Message) message;
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56
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57 ByteBuffer buf = ByteBuffer.allocate(1024);
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58 buf.setAutoExpand(true);
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59
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60 /*
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61 Ensure the message payload is within size limit
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62 Write length field to buffer,
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63 Write conversationId and
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64 payload array.
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65 Post bytebuffer to "out"
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66 */
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67 if ((myMessage.getPayload().length + 8) > maxObjectSize)
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68 throw new IOException("Message is too large");
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69
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70 buf.putInt(4 + myMessage.getPayload().length);
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71 buf.putInt(myMessage.getConversationId());
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72 buf.put(myMessage.getPayload());
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73
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74 buf.flip();
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75 out.write(buf);
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76 }
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77 }