dekuan/dedid

An unique id generator for primary key of distributed database.
This implementation of the algorithm was referenced by Twitter Snowflake,
but in the last 12 bits you can not only use the random numbers, but also get a hash value by your specified string.

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ALGORITHM

Bit structure

It’s a 64 bits bigint.

0 xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx x xxxxx xxxxx xxxx xxxxxxxx

Details

Position	Length	Usage	Remark
0	1	Reserved	Always be 0
1~41	41	Escaped Time (in millisecond)	0~69 years
42~46	5	Number of data center	0~31
47~51	5	Number of data node in the data center	0~31
52~63	12	Random / Hash	0~4095

Bit marks

Center

0 00000000 00000000 00000000 00000000 00000000 0 11111 00000 0000 00000000
00000000 00000000 00000000 00000000 00000000 00111110 00000000 00000000
00       00       00       00       00       3E       00       00

Node

0 00000000 00000000 00000000 00000000 00000000 0 00000 11111 0000 00000000
00000000 00000000 00000000 00000000 00000000 00000001 11110000 00000000
00       00       00       00       00       01       F0       00

Escaped Time

0 11111111 11111111 11111111 11111111 11111111 1 00000 00000 0000 00000000
01111111 11111111 11111111 11111111 11111111 11000000 00000000 00000000
7F       FF       FF       FF       FF       C0       00       00

Random or Hash value

0 00000000 00000000 00000000 00000000 00000000 0 00000 00000 1111 11111111
00000000 00000000 00000000 00000000 00000000 00000000 00001111 11111111
00       00       00       00       00       00       0F       FF

HOW TO USE

Create an new id normally

$cDId        = CDId::getInstance();
$nCenter    = 0;
$nNode        = 1;
$arrD        = [];
$nNewId    = $cDId->createId( $nCenter, $nNode, null, $arrD );
echo "new id = " . $nNewId . "\r\n";
print_r( $arrD );

output

new id = 114654484990270790
Array
(
    [center] => 0
    [node] => 1
    [time] => 27335759399
    [rand] => 3398
)

Create an new id with crc32 hash value by a specified string

$cDId        = CDId::getInstance();
$nCenter    = 0;
$nNode        = 15;
$sSrc        = "dekuan";
$arrD        = [];
$nNewId    = $cDId->createId( $nCenter, $nNode, $sSrc, $arrD );
echo "new id = " . $nNewId . "\r\n";
print_r( $arrD );

output

new id = 114654631304370386
Array
(
    [center] => 0
    [node] => 1
    [time] => 27335794283
    [rand] => 2258
)

Parse an id for getting the details

$cDId        = CDId::getInstance();
$arrId        = $cDId->parseId( 114654631304370386 );
print_r( $arrId );

output

Array
(
    [center] => 0
    [node] => 1
    [time] => 27335794283
    [rand] => 2258
)

INSTALL

# composer require dekuan/dedid

For more information, please visit https://packagist.org/packages/dekuan/dedid