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annotate src/org/dancres/blitz/remote/transport/MessageDecoder.java @ 0:3dc0c5604566

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Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
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3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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1 package org.dancres.blitz.remote.transport;
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2
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Dan Creswell <dan.creswell@gmail.com>
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3 import org.apache.mina.filter.codec.ProtocolDecoderOutput;
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4 import org.apache.mina.filter.codec.CumulativeProtocolDecoder;
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5 import org.apache.mina.common.IoSession;
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6 import org.apache.mina.common.ByteBuffer;
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7
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Dan Creswell <dan.creswell@gmail.com>
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8 /**
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9 */
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10 public class MessageDecoder extends CumulativeProtocolDecoder {
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11 private int maxObjectSize = MessageCodecFactory.DEFAULT_MAX_OBJECT_SIZE;
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12
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Dan Creswell <dan.creswell@gmail.com>
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13 /**
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14 * Creates a new instance with the {@link ClassLoader} of
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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15 * the current thread.
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16 */
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17 public MessageDecoder() {
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18 }
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19
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Dan Creswell <dan.creswell@gmail.com>
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20 /**
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Dan Creswell <dan.creswell@gmail.com>
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21 * Returns the allowed maximum size of the object to be decoded.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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22 * If the size of the object to be decoded exceeds this value, this
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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23 * decoder will throw a {@link org.apache.mina.common.BufferDataException}. The default
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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24 * value is <tt>1048576</tt> (1MB).
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Dan Creswell <dan.creswell@gmail.com>
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25 */
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26 public int getMaxObjectSize() {
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27 return maxObjectSize;
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28 }
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29
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Dan Creswell <dan.creswell@gmail.com>
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30 /**
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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31 * Sets the allowed maximum size of the object to be decoded.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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32 * If the size of the object to be decoded exceeds this value, this
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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33 * decoder will throw a {@link org.apache.mina.common.BufferDataException}. The default
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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34 * value is <tt>1048576</tt> (1MB).
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Dan Creswell <dan.creswell@gmail.com>
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35 */
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36 public void setMaxObjectSize(int maxObjectSize) {
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37 if (maxObjectSize <= 0) {
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38 throw new IllegalArgumentException(
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39 "maxObjectSize: " + maxObjectSize);
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40 }
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41
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42 this.maxObjectSize = maxObjectSize;
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43 }
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44
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Dan Creswell <dan.creswell@gmail.com>
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45 protected boolean doDecode(IoSession session, ByteBuffer in,
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46 ProtocolDecoderOutput out) throws Exception {
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47 if (!in.prefixedDataAvailable(4, maxObjectSize)) {
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48 return false;
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49 }
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50
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Dan Creswell <dan.creswell@gmail.com>
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51 /*
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52 Read length field
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Dan Creswell <dan.creswell@gmail.com>
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53 Read conversation id
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54 Extract payload array
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55 Construct Message object and post to "out"
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56 */
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57 int myLength = in.getInt();
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58 int myConversationId = in.getInt();
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59 byte[] myPayload = new byte[myLength - 4];
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60 in.get(myPayload);
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61
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62 out.write(new Message(myConversationId, myPayload));
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63
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64 return true;
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65 }
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66 }