XByteBuffer (Apache Tomcat 6.0.51 API Documentation)
Keywords: org.apache.catalina.tribes.io.XByteBuffer class

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## org.apache.catalina.tribes.io
Class XByteBuffer

    java.lang.Object
      org.apache.catalina.tribes.io.XByteBuffer

    public class XByteBuffer

extends java.lang.Object

The XByteBuffer provides a dual functionality. One, it stores message bytes and automatically extends the byte buffer if needed.
Two, it can encode and decode packages so that they can be defined and identified as they come in on a socket.
THIS CLASS IS NOT THREAD SAFE
Transfer package:

- START_DATA/b> - 7 bytes - FLT2002
- SIZE - 4 bytes - size of the data package
- DATA - should be as many bytes as the prev SIZE
- END_DATA - 7 bytes - TLF2003

Author:
  Filip Hanik

Field Summary
`protected byte[]` | `buf` Variable to hold the data
`protected int` | `bufSize` Current length of data in the buffer
`protected boolean` | `discard` Flag for discarding invalid packages If this flag is set to true, and append(byte[],...) is called, the data added will be inspected, and if it doesn't start with `START_DATA` it will be thrown away.
`static byte[]` | `END_DATA` This is the package footer, 7 bytes (TLF2003)
`static int` | `invokecount`
`static Log` | `log`
`static byte[]` | `START_DATA` This is a package header, 7 bytes (FLT2002)

Constructor Summary
`XByteBuffer(byte[] data, boolean discard)`
`XByteBuffer(byte[] data, int size, boolean discard)`
`XByteBuffer(int size, boolean discard)` Constructs a new XByteBuffer.

Method Summary
`boolean` | `append(boolean i)`
`boolean` | `append(byte i)`
`boolean` | `append(byte[] b, int off, int len)`
`boolean` | `append(java.nio.ByteBuffer b, int len)` Appends the data to the buffer.
`boolean` | `append(int i)`
`boolean` | `append(long i)`
`void` | `clear()` Resets the buffer
`int` | `countPackages()` Internal mechanism to make a check if a complete package exists within the buffer
`int` | `countPackages(boolean first)`
`static byte[]` | `createDataPackage(byte[] data)`
`static byte[]` | `createDataPackage(byte[] data, int doff, int dlength, byte[] buffer, int bufoff)`
`static byte[]` | `createDataPackage(ChannelData cdata)` Creates a complete data package
`static java.io.Serializable` | `deserialize(byte[] data)`
`static java.io.Serializable` | `deserialize(byte[] data, int offset, int length)`
`static java.io.Serializable` | `deserialize(byte[] data, int offset, int length, java.lang.ClassLoader[] cls)`
`boolean` | `doesPackageExist()` Method to check if a package exists in this byte buffer.
`void` | `expand(int newcount)`
`XByteBuffer` | `extractDataPackage(boolean clearFromBuffer)` Extracts the message bytes from a package.
`ChannelData` | `extractPackage(boolean clearFromBuffer)`
`static int` | `firstIndexOf(byte[] src, int srcOff, byte[] find)` Similar to a String.IndexOf, but uses pure bytes
`byte[]` | `getBytes()` Returns the bytes in the buffer, in its exact length
`byte[]` | `getBytesDirect()`
`int` | `getCapacity()`
`static int` | `getDataPackageLength(int datalength)`
`boolean` | `getDiscard()`
`int` | `getLength()`
`void` | `reset()`
`static byte[]` | `serialize(java.io.Serializable msg)` Serializes a message into cluster data
`void` | `setDiscard(boolean discard)`
`void` | `setLength(int size)`
`static boolean` | `toBoolean(byte[] b, int offset)`
`static byte[]` | `toBytes(boolean bool)` Deprecated. use toBytes(boolean,byte[],int)
`static byte[]` | `toBytes(boolean bool, byte[] data, int offset)`
`static byte[]` | `toBytes(int n)` Deprecated. use toBytes(int,byte[],int)
`static byte[]` | `toBytes(int n, byte[] b, int offset)`
`static byte[]` | `toBytes(long n)` Deprecated. use toBytes(long,byte[],int)
`static byte[]` | `toBytes(long n, byte[] b, int offset)`
`static int` | `toInt(byte[] b, int off)` Convert four bytes to an int
`static long` | `toLong(byte[] b, int off)` Convert eight bytes to a long
`void` | `trim(int length)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### log

    public static Log log

### START_DATA

    public static final byte[] START_DATA

  This is a package header, 7 bytes (FLT2002)

### END_DATA

    public static final byte[] END_DATA

  This is the package footer, 7 bytes (TLF2003)

### buf

    protected byte[] buf

  Variable to hold the data

### bufSize

    protected int bufSize

  Current length of data in the buffer

### discard

    protected boolean discard

  Flag for discarding invalid packages If this flag is set to true, and append(byte[],...) is called, the data added will be inspected, and if it doesn't start with `START_DATA` it will be thrown away.

### invokecount

    public static int invokecount

Constructor Detail

### XByteBuffer

    public XByteBuffer(int size,
                       boolean discard)

  Constructs a new XByteBuffer.
  TODO use a pool of byte[] for performance

  Parameters:
    `size` - - the initial size of the byte buffer TODO use a pool of byte[] for performance

### XByteBuffer

    public XByteBuffer(byte[] data,
                       boolean discard)

### XByteBuffer

    public XByteBuffer(byte[] data,
                       int size,
                       boolean discard)

Method Detail

### getLength

    public int getLength()

### setLength

    public void setLength(int size)

### trim

    public void trim(int length)

### reset

    public void reset()

### getBytesDirect

    public byte[] getBytesDirect()

### getBytes

    public byte[] getBytes()

  Returns the bytes in the buffer, in its exact length

### clear

    public void clear()

  Resets the buffer

### append

    public boolean append(java.nio.ByteBuffer b,
                          int len)

  Appends the data to the buffer. If the data is incorrectly formatted, ie, the data should always start with the header, false will be returned and the data will be discarded.

  Parameters:
    `b` - - bytes to be appended
    `len` - - the number of bytes to append.
  Returns:
    true if the data was appended correctly. Returns false if the package is incorrect, ie missing header or something, or the length of data is 0

### append

    public boolean append(byte i)

### append

    public boolean append(boolean i)

### append

    public boolean append(long i)

### append

    public boolean append(int i)

### append

    public boolean append(byte[] b,
                          int off,
                          int len)

### expand

    public void expand(int newcount)

### getCapacity

    public int getCapacity()

### countPackages

    public int countPackages()

  Internal mechanism to make a check if a complete package exists within the buffer

  Returns:
    - true if a complete package (header,compress,size,data,footer) exists within the buffer

### countPackages

    public int countPackages(boolean first)

### doesPackageExist

    public boolean doesPackageExist()

  Method to check if a package exists in this byte buffer.

  Returns:
    - true if a complete package (header,options,size,data,footer) exists within the buffer

### extractDataPackage

    public XByteBuffer extractDataPackage(boolean clearFromBuffer)

  Extracts the message bytes from a package. If no package exists, a IllegalStateException will be thrown.

  Parameters:
    `clearFromBuffer` - - if true, the package will be removed from the byte buffer
  Returns:
    - returns the actual message bytes (header, compress,size and footer not included).

### extractPackage

    public ChannelData extractPackage(boolean clearFromBuffer)
                               throws java.io.IOException

  Throws:
    `java.io.IOException`

### createDataPackage

    public static byte[] createDataPackage(ChannelData cdata)

  Creates a complete data package

  Parameters:
    `cdata` - - the message data to be contained within the package
  Returns:
    - a full package (header,size,data,footer)

### createDataPackage

    public static byte[] createDataPackage(byte[] data,
                                           int doff,
                                           int dlength,
                                           byte[] buffer,
                                           int bufoff)

### getDataPackageLength

    public static int getDataPackageLength(int datalength)

### createDataPackage

    public static byte[] createDataPackage(byte[] data)

### toInt

    public static int toInt(byte[] b,
                            int off)

  Convert four bytes to an int

  Parameters:
    `b` - - the byte array containing the four bytes
    `off` - - the offset
  Returns:
    the integer value constructed from the four bytes
  Throws:
    `java.lang.ArrayIndexOutOfBoundsException`

### toLong

    public static long toLong(byte[] b,
                              int off)

  Convert eight bytes to a long

  Parameters:
    `b` - - the byte array containing the four bytes
    `off` - - the offset
  Returns:
    the long value constructed from the eight bytes
  Throws:
    `java.lang.ArrayIndexOutOfBoundsException`

### toBytes

    public static byte[] toBytes(boolean bool)

  Deprecated. use toBytes(boolean,byte[],int)

  Converts an boolean to four bytes

  Parameters:
    `bool` - - the boolean
  Returns:
    - four bytes in an array

### toBytes

    public static byte[] toBytes(boolean bool,
                                 byte[] data,
                                 int offset)

### toBoolean

    public static boolean toBoolean(byte[] b,
                                    int offset)

### toBytes

    public static byte[] toBytes(int n)

  Deprecated. use toBytes(int,byte[],int)

  Converts an integer to four bytes

  Parameters:
    `n` - - the integer
  Returns:
    - four bytes in an array

### toBytes

    public static byte[] toBytes(int n,
                                 byte[] b,
                                 int offset)

### toBytes

    public static byte[] toBytes(long n)

  Deprecated. use toBytes(long,byte[],int)

  Converts an long to eight bytes

  Parameters:
    `n` - - the long
  Returns:
    - eight bytes in an array

### toBytes

    public static byte[] toBytes(long n,
                                 byte[] b,
                                 int offset)

### firstIndexOf

    public static int firstIndexOf(byte[] src,
                                   int srcOff,
                                   byte[] find)

  Similar to a String.IndexOf, but uses pure bytes

  Parameters:
    `src` - - the source bytes to be searched
    `srcOff` - - offset on the source buffer
    `find` - - the string to be found within src
  Returns:
    - the index of the first matching byte. -1 if the find array is not found

### deserialize

    public static java.io.Serializable deserialize(byte[] data)
                                            throws java.io.IOException,
                                                   java.lang.ClassNotFoundException,
                                                   java.lang.ClassCastException

  Throws:
    `java.io.IOException`
    `java.lang.ClassNotFoundException`
    `java.lang.ClassCastException`

### deserialize

    public static java.io.Serializable deserialize(byte[] data,
                                                   int offset,
                                                   int length)
                                            throws java.io.IOException,
                                                   java.lang.ClassNotFoundException,
                                                   java.lang.ClassCastException

  Throws:
    `java.io.IOException`
    `java.lang.ClassNotFoundException`
    `java.lang.ClassCastException`

### deserialize

    public static java.io.Serializable deserialize(byte[] data,
                                                   int offset,
                                                   int length,
                                                   java.lang.ClassLoader[] cls)
                                            throws java.io.IOException,
                                                   java.lang.ClassNotFoundException,
                                                   java.lang.ClassCastException

  Throws:
    `java.io.IOException`
    `java.lang.ClassNotFoundException`
    `java.lang.ClassCastException`

### serialize

    public static byte[] serialize(java.io.Serializable msg)
                            throws java.io.IOException

  Serializes a message into cluster data

  Parameters:
    `msg` - ClusterMessage
  Throws:
    `java.io.IOException`

### setDiscard

    public void setDiscard(boolean discard)

### getDiscard

    public boolean getDiscard()

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