This is a file based key-vaue dataStore created in java, for storing data in a file. It supports basic CRD(create,read,delete) operations

• Create a folder named "DataStore" in C:\ drive of your windows system and clone this repository in that folder.(All the files and folders must be under DataStore folder).
• Now to establish automatic deletetion of records which are expired or their time-to-live peroid is over. place DataStoreRun.bat file in startup programs of windows.
• To find that startup folder press windows+R key and then in text box type shell:startup then click OK. The required folder will get open, in that folder put DataStoreRun.bat file.
• Now the installation setup is done.

DataStoreInterface dataStore=DataStore.getInstance();

or

DataStoreInterface dataStore=DataStore.getInstance("C:\\path to desired file\\file.abc"); 

• If path is not provided then it will get instantiated in the default location C:\dataStoreData\store.data otherwise in the file name provided.
• Client can instantiate in multiple files but for any file only it's one instnace will be returned.

public void create(String key,String jasonString,long time-to-live);
ex: dataStore.create("ABC","{\"abc\":\"pqr\"}",67577);

• Third parameter time-to-live(in seconds) is optional, if provided then the key will be valid for only upto that durtion of time.
• If key already exists or json is invalid then it will throw DatStoreException.
• If fle size exceeds 1GB then it will throw DatStoreException.
• If key passed is more than 32 characters then it will throw DatStoreException.
• If the JSON passed is more than 16 KB then it will throw DataStoreException

public String get(String key);
ex: dataStore.get("ABC");

• To get data, pass the key for that data. If key is found then it will return JSON string for that, otherwise it will return null. this method throws DataStoreException.

public boolean delete(String key);
ex: dataStore.delete("ABC");

• This method will delete the key and data against that key if key is found. If found deleted then it will return true otherwise false. this method throws DataStoreException.

To compile: Add jar files in dist folder to your classpath

javac -classpath c:\DataStore\dist\*;. yourFileName.java

To run: Add jar files in dist folder to your classpath

java -classpath c:\DataStore\dist\*;. classFileName

• The code written in library is thread safe.
• Not more than one process can access the same file at any instant of time.
• This library is tested on windows-10 operating system.
• JDK must be installed in your system to use this library.

import com.freshworks.dataStore.DataStore;
import com.freshworks.dataStore.exceptions.*;
import com.freshworks.dataStore.interfaces.DataStoreInterface;
public class test1 {
   public static void main(String arg[])
   {
      try{
         DataStoreInterface dsi,dsi2,dsi3;
      //get instanece of store at default location - C:\dataStoreData\store.data
      dsi=DataStore.getInstance();
      
      //create and key and strore key value pair to store
      dsi.create("ABC","{\"name\":\"abc\"}" );
      dsi.create("XYZ","{\"name\":\"xyz\"}" );
      //get method to get  json against key ABC
      String abc=dsi.get("ABC");
      System.out.println(abc);

      String xyz=dsi.get("XYZ");
      System.out.println(xyz);
      
      //delete key and value against key ABC, it will return true if deleted successfully elese return false if key not found
      boolean isDel=dsi.delete("ABC");
      System.out.println(isDel);
      isDel=dsi.delete("XYZ");
      System.out.println(isDel);

      dsi2=DataStore.getInstance();
      System.out.println(dsi2.get("ABC"));

      dsi3=DataStore.getInstance("C:\\ddStore\\pqr.aa");
      dsi3.create("PQR", "{\"name\":\"pqr\"}");
         

      }catch(Exception e)
      {
         e.printStackTrace();
         System.out.println(e.getMessage());
      }
   }
   
}