Source Code Cross Referenced for aSocketInputStream.java in  » Web-Server » Rimfaxe-Web-Server » seda » sandStorm » lib » aSocket » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Server » Rimfaxe Web Server » seda.sandStorm.lib.aSocket 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* 
002:         * Copyright (c) 2001 by Matt Welsh and The Regents of the University of 
003:         * California. All rights reserved.
004:         *
005:         * Permission to use, copy, modify, and distribute this software and its
006:         * documentation for any purpose, without fee, and without written agreement is
007:         * hereby granted, provided that the above copyright notice and the following
008:         * two paragraphs appear in all copies of this software.
009:         * 
010:         * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
011:         * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
012:         * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
013:         * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
014:         * 
015:         * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
016:         * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
017:         * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
018:         * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
019:         * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
020:         *
021:         * Author: Matt Welsh <mdw@cs.berkeley.edu>
022:         * 
023:         */
024:
025:        package seda.sandStorm.lib.aSocket;
026:
027:        import java.util.*;
028:        import java.io.*;
029:        import java.net.*;
030:        import seda.sandStorm.lib.util.MultiByteArrayInputStream;
031:
032:        /**
033:         * This is a utility class that allows you to push multiple ATcpInPackets
034:         * in, and read bytes out as a stream. This is meant to be a convenience
035:         * for performing packet processing using the aSocket interfaces. 
036:         * This class also takes care of reordering packets according to the
037:         * ATcpInPacket sequence number; that is, if multiple threads in a stage
038:         * are receiving ATcpInPackets for the same connection, the aSocketInputStream
039:         * will internally reorder those packets.
040:         * 
041:         * @author Matt Welsh
042:         * @see MultiByteArrayInputStream
043:         */
044:        public class aSocketInputStream extends MultiByteArrayInputStream {
045:
046:            private static final boolean DEBUG = false;
047:
048:            private TreeSet outoforder;
049:            private long nextSeqNum;
050:
051:            /**
052:             * Create an aSocketInputStream with an initial sequence number of 1.
053:             */
054:            public aSocketInputStream() {
055:                super ();
056:                outoforder = new TreeSet(new seqNumComparator());
057:                nextSeqNum = 1;
058:            }
059:
060:            /**
061:             * Create an aSocketInputStream using the given initial sequence number.
062:             */
063:            public aSocketInputStream(long initialSeqNum) {
064:                super ();
065:                outoforder = new TreeSet(new seqNumComparator());
066:                nextSeqNum = initialSeqNum;
067:            }
068:
069:            // Internal class used to reorder elements of 'outoforder' according
070:            // to sequence number
071:            class seqNumComparator implements  Comparator {
072:                public int compare(Object o1, Object o2)
073:                        throws ClassCastException {
074:                    ATcpInPacket p1 = (ATcpInPacket) o1;
075:                    ATcpInPacket p2 = (ATcpInPacket) o2;
076:                    long sn1 = p1.seqNum;
077:                    long sn2 = p2.seqNum;
078:
079:                    if (sn1 == sn2)
080:                        return 0;
081:                    else if (sn1 < sn2)
082:                        return -1;
083:                    else
084:                        return 1;
085:                }
086:            }
087:
088:            /**
089:             * Add a packet to this aSocketInputStream. Reorders packets internally
090:             * so that bytes will be read from this InputStream according to the 
091:             * sequence number order of the packets.
092:             */
093:            public synchronized void addPacket(ATcpInPacket pkt) {
094:                long sn = pkt.getSequenceNumber();
095:                if (sn == 0) {
096:                    // No sequence number -- assume it's in order, but don't increment
097:                    // the nextSeqNum
098:                    addArray(pkt.getBytes());
099:                } else if (sn == nextSeqNum) {
100:                    addArray(pkt.getBytes());
101:                    nextSeqNum++;
102:                    // seqNum of 0 is special
103:                    if (nextSeqNum == 0)
104:                        nextSeqNum = 1;
105:                } else {
106:                    // Assume out of order. Don't treat (sn < nextSeqNum)
107:                    // differently than (sn > nextSeqNum), since we have
108:                    // wraparound.
109:
110:                    System.out
111:                            .println("aSocketInputStream : Out of order packet");
112:                    outoforder.add(pkt);
113:
114:                    // Push any 'ready' outoforder elements
115:                    try {
116:                        ATcpInPacket first = (ATcpInPacket) outoforder.first();
117:                        while (first != null && first.seqNum == nextSeqNum) {
118:                            outoforder.remove(first);
119:                            addArray(first.getBytes());
120:                            nextSeqNum++;
121:                            // seqNum of 0 is special
122:                            if (nextSeqNum == 0)
123:                                nextSeqNum = 1;
124:                            first = (ATcpInPacket) outoforder.first();
125:                        }
126:                    } catch (NoSuchElementException e) {
127:                        // Ignore
128:                    }
129:                }
130:            }
131:
132:            /**
133:             * Reinitialize the state of this input stream, clearing all
134:             * internal data and pointers. The next sequence number will 
135:             * be preserved.
136:             */
137:            public synchronized void clear() {
138:                super .clear();
139:                outoforder = new TreeSet(new seqNumComparator());
140:            }
141:
142:            /**
143:             * Return the next expected sequence number.
144:             */
145:            public synchronized long getNextSequenceNumber() {
146:                return nextSeqNum;
147:            }
148:
149:        }
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