org.apache.jk.core
Class Msg

java.lang.Object
  org.apache.jk.core.Msg

Direct Known Subclasses:

MsgAjp

public abstract class Msg
extends java.lang.Object

A single packet for communication between the web server and the container. In a more generic sense, it's the event that drives the processing chain. XXX Use Event, make Msg a particular case.

Author:

Henri Gomez [hgomez@apache.org], Dan Milstein [danmil@shore.net], Keith Wannamaker [Keith@Wannamaker.org], Kevin Seguin, Costin Manolache

Msg

public Msg()

reset

public abstract void reset()

Prepare this packet for accumulating a message from the container to the web server. Set the write position to just after the header (but leave the length unwritten, because it is as yet unknown).

end

public abstract void end()

For a packet to be sent to the web server, finish the process of accumulating data and write the length of the data payload into the header.

appendInt

public abstract void appendInt(int val)

appendByte

public abstract void appendByte(int val)

appendLongInt

public abstract void appendLongInt(int val)

appendBytes

public abstract void appendBytes(MessageBytes mb)
                          throws java.io.IOException

Throws:

java.io.IOException

appendByteChunk

public abstract void appendByteChunk(ByteChunk bc)
                              throws java.io.IOException

Throws:

java.io.IOException

appendBytes

public abstract void appendBytes(byte[] b,
                                 int off,
                                 int numBytes)

Copy a chunk of bytes into the packet, starting at the current write position. The chunk of bytes is encoded with the length in two bytes first, then the data itself, and finally a terminating \0 (which is not included in the encoded length).

Parameters:

b - The array from which to copy bytes.

off - The offset into the array at which to start copying

numBytes - The number of bytes to copy.

getInt

public abstract int getInt()

Read an integer from packet, and advance the read position past it. Integers are encoded as two unsigned bytes with the high-order byte first, and, as far as I can tell, in little-endian order within each byte.

peekInt

public abstract int peekInt()

getByte

public abstract byte getByte()

peekByte

public abstract byte peekByte()

getBytes

public abstract void getBytes(MessageBytes mb)

getBytes

public abstract int getBytes(byte[] dest)

Copy a chunk of bytes from the packet into an array and advance the read position past the chunk. See appendBytes() for details on the encoding.

Returns:

The number of bytes copied.

getLongInt

public abstract int getLongInt()

Read a 32 bits integer from packet, and advance the read position past it. Integers are encoded as four unsigned bytes with the high-order byte first, and, as far as I can tell, in little-endian order within each byte.

getHeaderLength

public abstract int getHeaderLength()

processHeader

public abstract int processHeader()

getBuffer

public abstract byte[] getBuffer()

getLen

public abstract int getLen()

dump

public abstract void dump(java.lang.String msg)

hexLine

public static java.lang.String hexLine(byte[] buf,
                                       int start,
                                       int len)