JSON-Database

client-server application that allows clients to store data in JSON format.

Stack and topics covered:

• JSON (Gson)
• Sockets
• Multithreading (threads, executors, synchronization, shared data, locks)
• Collections framework (list, set and map interfaces)
• Design patterns (command, singleton)
• Reading and writing files
• Input and output streams
• JCommander
• Maven

Build

to build the project

mvn clean package

this should generate two jars:

• server-jar-with-dependencies.jar in the target folder of the server module.
• client-jar-with-dependencies.jar in the target folder of the client module

Run

first run the server

java -jar server/target/server-jar-with-dependencies.jar

then run the client with the request args

java -jar client/target/client-jar-with-dependencies.jar -t set -k "some key" -v "some value"

or you can run the client with a file containing the request as json, for example set.json has the following content:

{
  "type": "set",
  "key": "some key",
  "value": "some value"
}

java -jar client/target/client-jar-with-dependencies.jar -in set.json

the output should be something like

Sent: {
  "type": "set",
  "key": "some key",
  "value": "some value"
}
Received: {
  "response": "OK"
}

Usage

option	description
-t, --type	Type of the request (set, get, delete)
-k, --key	Record key
-v, --value	Value to add
-in, --input-file	File containing the request as json