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This article mainly introduces "how to mount LevelDB storage with KyotoTycoon". In daily operation, I believe many people have doubts about how to mount LevelDB storage with KyotoTycoon. The editor consulted all kinds of data and sorted out a simple and easy-to-use method of operation. I hope it will be helpful to answer the doubt of "how to mount LevelDB storage with KyotoTycoon"! Next, please follow the editor to study!

1. Install LevelDB

Get the source code first

$svncheckout http://leveldb.googlecode.com/svn/trunk/leveldb-read-only

Modify Makefile and add the-fPIC option

+ CFLAGS=-c-I.-I./include$ (PLATFORM_CFLAGS) $(OPT)

-CFLAGS=-c-I.-I./include$ (PLATFORM_CFLAGS) $(OPT)-fPIC

If you are using Ubuntu, then modify the port/port_posix.h file:

+ # include

-# include

After the above modifications, start the installation

$make

$sudocplibleveldb.a/usr/local/lib

$sudocp-rinclude/leveldb/usr/local/include

In this way, LevelDB is installed.

two。 Mount LevelDB on KC

Download the latest KC source code and run the following command to install

$cdkyototycoon-x.y.z

$. / configure

$make

$sudomakeinstall

$cdlab/leveldb

$make

$sudocpktplugdblevel.so/usr/local/lib

After the installation is complete, it can be run.

$ktserver-pldb/usr/local/lib/ktplugdblevel.socasket.ldb

You can directly connect to some Set operations.

$ktremotemgrsetjapantokyo

$ktremotemgrsetkoreaseoul

$ktremotemgrsetchinabeijing

Check the data just entered by Set:

$ktremotemgrlist-pv

How to mount LevelDB storage with KyotoTycoon

3. Plug-in implementation

A copy of the source code attached to LevelDB is attached below, and the logic is very simple:

ClassLevelDB:publickt::PluggableDB {

...

Boolaccept_impl (constchar*kbuf,size_tksiz,Visitor*visitor,boolwritable) {

Size_tlidx=kc::hashmurmur (kbuf,ksiz)% RLOCKSLOT

If (writable) {

Rlock_.lock_writer (lidx)

} else {

Rlock_.lock_reader (lidx)

}

Std::stringkey (kbuf,ksiz)

Std::stringvalue

Lv::Statusstatus=db_- > Get (lv::ReadOptions (), key,&value)

Constchar*rbuf

Size_trsiz

If (status.ok ()) {

Rbuf=visitor- > visit_full (kbuf,ksiz,value.data (), value.size (), & rsiz)

} else {

Rbuf=visitor- > visit_empty (kbuf,ksiz,&rsiz)

}

Boolerr=false

If (rbuf==kc::BasicDB::Visitor::REMOVE) {

Lv::WriteOptionswopts

If (autosync_) wopts.sync=true

Status=db_- > Delete (wopts,key)

If (! status.ok ()) {

Set_error (_ KCCODELINE_,Error::SYSTEM, "DB::Deletefailed")

Err=true

}

} elseif (rbufo _ blank _ blank _ k _ c _ (C _ C _ V _ C _ G _ C _ V _ C _ G _ C _ V _ D _ R _ P

Lv::WriteOptionswopts

If (autosync_) wopts.sync=true

Std::stringrvalue (rbuf,rsiz)

Status=db_- > Put (wopts,key,rvalue)

If (! status.ok ()) {

Set_error (_ KCCODELINE_,Error::SYSTEM, "DB::Putfailed")

Err=true

}

}

Rlock_.unlock (lidx)

Return!err

}

...

}

At this point, the study on "how to mount LevelDB storage with KyotoTycoon" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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