Metadata Management Server (MMServer) is a simple server for meta data management based on GRPC. This is the single node application for small scale testing cases. It provides two main function currently.

• distributed timer
• message communication (shared space and message queue)

Build

The only depedency for this project is the grpc and protobuf. Refer to this about building grpc and protocol buffer

CMake

No matter to use cmake or automake, it is better to set the separate the build dir.

for example, if the build dir for grpc is ~/cworkspace/build_grpc the and build dir for protobuf is ~/cworkspace/build_protobuf

put them in following parts in CMakeLists.txt

list(APPEND CMAKE_PREFIX_PATH "~/cworkspace/build_grpc" "~/cworkspace/build_protobuf")

then create another build dir to build the MMServer

mkdir build_MMServer
cd build_MMServer
cmake ../MMServer
make

Makefile

There is a Makefile in the build folder used to build the project by Makefile explicitly.

export ROOT_PATH=~/cworkspace
export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:$ROOT_PATH/build_protobuf/lib/pkgconfig
export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:$ROOT_PATH/build_grpc/lib/pkgconfig

then execute make

Example

The addr info will be write into the dir Metaserver

start the server:

-bash-4.2$ rm -rf Metaserver/
-bash-4.2$ ./metaserver 
key (world) start timing
key (world) end timing, time (1.000475)
key (pattern_tick) start timing
key (pattern_tick) is timing
key (pattern_tick) tick, time (0.000244)
key (pattern_tick) tick, time (0.000391)

start the client:

-bash-4.2$ ./metaclient 
Timer received: OK
Timer received: OK
Get pattern1 recieve: NULL
Put meta1 recieve: OK
Put meta2 recieve: OK
Put meta3 recieve: OK
Get pattern1 recieve: meta1
Get pattern1 recieve: meta2
Get pattern1 recieve: meta3
Get pattern1 recieve: NULL
------test tick------
Put pattern_tick 1st recieve: OK
Put pattern_tick 2st recieve: OK
Put pattern_tick 3st recieve: OK
Put pattern_tick 4st recieve: OK

for pythonclient, install the grpc and protocol for python firstly, then execute make in pythonclient dir.

TODO List

• delete addr folder before start
• add the update interface, which will update the key anyway