Package com.moilioncircle.redis.replicator.rdb

Class BaseRdbParser

java.lang.Object

com.moilioncircle.redis.replicator.rdb.BaseRdbParser

public class BaseRdbParser
extends Object

Since:

2.1.0

Author:

Leon Chen

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	BaseRdbParser.Len
static class	BaseRdbParser.LenHelper
static class	BaseRdbParser.StringHelper

Field Summary

Fields

Modifier and Type	Field	Description
protected RedisInputStream	in

Constructor Summary

Constructors

Constructor	Description
BaseRdbParser(RedisInputStream in)

Method Summary

Modifier and Type	Method	Description
ByteArray	rdbGenericLoadStringObject(int flags)	1.|11xxxxxx|xxxxxxxx| remaining 6bit is 0, then an 8 bit integer follows
double	rdbLoadBinaryDoubleValue()
float	rdbLoadBinaryFloatValue()
double	rdbLoadDoubleValue()
ByteArray	rdbLoadEncodedStringObject()
ByteArray	rdbLoadIntegerObject(int enctype, int flags)
BaseRdbParser.Len	rdbLoadLen()	read bytes 1 or 2 or 5
ByteArray	rdbLoadLzfStringObject(int flags)	|11xxxxxx| remaining 6bit is 3,then lzf compressed string follows
long	rdbLoadMillisecondTime()	"expiry time in ms".
ByteArray	rdbLoadPlainStringObject()
int	rdbLoadTime()	"expiry time in seconds".

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

in

protected final RedisInputStream in

Constructor Detail

BaseRdbParser

public BaseRdbParser(RedisInputStream in)

Method Detail

rdbLoadTime

public int rdbLoadTime()
                throws IOException

"expiry time in seconds". After that, expiry time is read as a 4 byte unsigned int

Returns:

seconds

Throws:

IOException - when read timeout

rdbLoadMillisecondTime

public long rdbLoadMillisecondTime()
                            throws IOException

"expiry time in ms". After that, expiry time is read as a 8 byte unsigned long

Returns:

millisecond

Throws:

IOException - when read timeout

rdbLoadLen

public BaseRdbParser.Len rdbLoadLen()
                             throws IOException

read bytes 1 or 2 or 5

1. |00xxxxxx| remaining 6 bits represent the length

2. |01xxxxxx|xxxxxxxx| the combined 14 bits represent the length

3. |10xxxxxx|xxxxxxxx|xxxxxxxx|xxxxxxxx|xxxxxxxx| the remaining 6 bits are discarded.Additional 4 bytes represent the length(big endian in version6)

4. |11xxxxxx| the remaining 6 bits are read.and then the next object is encoded in a special format.so we set encoded = true

Returns:

tuple(len, encoded)

Throws:

IOException - when read timeout

See Also:

rdbLoadIntegerObject(int, int), rdbLoadLzfStringObject(int)

rdbLoadIntegerObject

public ByteArray rdbLoadIntegerObject(int enctype,
                                      int flags)
                               throws IOException

Parameters:

enctype - 0,1,2

flags - RDB_LOAD_ENC: encoded string.RDB_LOAD_PLAIN | RDB_LOAD_NONE:raw bytes

Returns:

ByteArray rdb byte array object

Throws:

IOException - when read timeout

rdbLoadLzfStringObject

public ByteArray rdbLoadLzfStringObject(int flags)
                                 throws IOException

|11xxxxxx| remaining 6bit is 3,then lzf compressed string follows

lzf format

|lzf flag|clen:1 or 2 or 5 bytes|len:1 or 2 or 5 bytes | lzf compressed bytes |

|11xxxxxx|xxxxxxxx|....|xxxxxxxx|xxxxxxxx|....|xxxxxxxx|xxxxxxxx|xxxxxxxx|............xxxxxxxx|

Parameters:

flags - RDB_LOAD_ENC: encoded string.RDB_LOAD_PLAIN | RDB_LOAD_NONE:raw bytes

Returns:

ByteArray rdb byte array object

Throws:

IOException - when read timeout

See Also:

rdbLoadLen()

rdbGenericLoadStringObject

public ByteArray rdbGenericLoadStringObject(int flags)
                                     throws IOException

1.|11xxxxxx|xxxxxxxx| remaining 6bit is 0, then an 8 bit integer follows

2.|11xxxxxx|xxxxxxxx|xxxxxxxx| remaining 6bit is 1, then an 16 bit integer follows

3.|11xxxxxx|xxxxxxxx|xxxxxxxx|xxxxxxxx|xxxxxxxx| remaining 6bit is 2, then an 32 bit integer follows

4.|11xxxxxx| remaining 6bit is 3,then lzf compressed string follows

Parameters:

flags - RDB_LOAD_ENC: encoded string.RDB_LOAD_PLAIN | RDB_LOAD_NONE:raw bytes

Returns:

ByteArray rdb byte array object

Throws:

IOException - when read timeout

See Also:

rdbLoadIntegerObject(int, int), rdbLoadLzfStringObject(int)

rdbLoadPlainStringObject

public ByteArray rdbLoadPlainStringObject()
                                   throws IOException

Returns:

ByteArray rdb object with byte[]

Throws:

IOException - when read timeout

rdbLoadEncodedStringObject

public ByteArray rdbLoadEncodedStringObject()
                                     throws IOException

Returns:

ByteArray rdb object with byte[]

Throws:

IOException - when read timeout

rdbLoadDoubleValue

public double rdbLoadDoubleValue()
                          throws IOException

Throws:

IOException

rdbLoadBinaryDoubleValue

public double rdbLoadBinaryDoubleValue()
                                throws IOException

Throws:

IOException

rdbLoadBinaryFloatValue

public float rdbLoadBinaryFloatValue()
                              throws IOException

Returns:

single precision float

Throws:

IOException - io exception

Since:

2.2.0