Source Code Cross Referenced for Msg.java in  » Sevlet-Container » tomcat-connectors » org » apache » jk » core » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Sevlet Container » tomcat connectors » org.apache.jk.core 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Copyright 1999-2004 The Apache Software Foundation
003:         *
004:         *  Licensed under the Apache License, Version 2.0 (the "License");
005:         *  you may not use this file except in compliance with the License.
006:         *  You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         *  Unless required by applicable law or agreed to in writing, software
011:         *  distributed under the License is distributed on an "AS IS" BASIS,
012:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         *  See the License for the specific language governing permissions and
014:         *  limitations under the License.
015:         */
016:
017:        package org.apache.jk.core;
018:
019:        import java.io.IOException;
020:
021:        import org.apache.tomcat.util.buf.ByteChunk;
022:        import org.apache.tomcat.util.buf.MessageBytes;
023:
024:        /**
025:         * A single packet for communication between the web server and the
026:         * container.
027:         *
028:         * In a more generic sense, it's the event that drives the processing chain.
029:         * XXX Use Event, make Msg a particular case.
030:         *
031:         * @author Henri Gomez [hgomez@apache.org]
032:         * @author Dan Milstein [danmil@shore.net]
033:         * @author Keith Wannamaker [Keith@Wannamaker.org]
034:         * @author Kevin Seguin
035:         * @author Costin Manolache
036:         */
037:        public abstract class Msg {
038:
039:            /**
040:             * Prepare this packet for accumulating a message from the container to
041:             * the web server.  Set the write position to just after the header
042:             * (but leave the length unwritten, because it is as yet unknown).
043:             */
044:            public abstract void reset();
045:
046:            /**
047:             * For a packet to be sent to the web server, finish the process of
048:             * accumulating data and write the length of the data payload into
049:             * the header.  
050:             */
051:            public abstract void end();
052:
053:            public abstract void appendInt(int val);
054:
055:            public abstract void appendByte(int val);
056:
057:            public abstract void appendLongInt(int val);
058:
059:            /**
060:             */
061:            public abstract void appendBytes(MessageBytes mb)
062:                    throws IOException;
063:
064:            public abstract void appendByteChunk(ByteChunk bc)
065:                    throws IOException;
066:
067:            /** 
068:             * Copy a chunk of bytes into the packet, starting at the current
069:             * write position.  The chunk of bytes is encoded with the length
070:             * in two bytes first, then the data itself, and finally a
071:             * terminating \0 (which is <B>not</B> included in the encoded
072:             * length).
073:             *
074:             * @param b The array from which to copy bytes.
075:             * @param off The offset into the array at which to start copying
076:             * @param len The number of bytes to copy.  
077:             */
078:            public abstract void appendBytes(byte b[], int off, int numBytes);
079:
080:            /**
081:             * Read an integer from packet, and advance the read position past
082:             * it.  Integers are encoded as two unsigned bytes with the
083:             * high-order byte first, and, as far as I can tell, in
084:             * little-endian order within each byte.  
085:             */
086:            public abstract int getInt();
087:
088:            public abstract int peekInt();
089:
090:            public abstract byte getByte();
091:
092:            public abstract byte peekByte();
093:
094:            public abstract void getBytes(MessageBytes mb);
095:
096:            /**
097:             * Copy a chunk of bytes from the packet into an array and advance
098:             * the read position past the chunk.  See appendBytes() for details
099:             * on the encoding.
100:             *
101:             * @return The number of bytes copied.
102:             */
103:            public abstract int getBytes(byte dest[]);
104:
105:            /**
106:             * Read a 32 bits integer from packet, and advance the read position past
107:             * it.  Integers are encoded as four unsigned bytes with the
108:             * high-order byte first, and, as far as I can tell, in
109:             * little-endian order within each byte.
110:             */
111:            public abstract int getLongInt();
112:
113:            public abstract int getHeaderLength();
114:
115:            public abstract int processHeader();
116:
117:            public abstract byte[] getBuffer();
118:
119:            public abstract int getLen();
120:
121:            public abstract void dump(String msg);
122:
123:            /* -------------------- Utilities -------------------- */
124:            // XXX Move to util package
125:            public static String hexLine(byte buf[], int start, int len) {
126:                StringBuffer sb = new StringBuffer();
127:                for (int i = start; i < start + 16; i++) {
128:                    if (i < len + 4)
129:                        sb.append(hex(buf[i]) + " ");
130:                    else
131:                        sb.append("   ");
132:                }
133:                sb.append(" | ");
134:                for (int i = start; i < start + 16 && i < len + 4; i++) {
135:                    if (!Character.isISOControl((char) buf[i]))
136:                        sb.append(new Character((char) buf[i]));
137:                    else
138:                        sb.append(".");
139:                }
140:                return sb.toString();
141:            }
142:
143:            private static String hex(int x) {
144:                //	    if( x < 0) x=256 + x;
145:                String h = Integer.toHexString(x);
146:                if (h.length() == 1)
147:                    h = "0" + h;
148:                return h.substring(h.length() - 2);
149:            }
150:
151:        }
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