Quickstart

Add dependencies to build.gradle

repositories {
  mavenCentral()
  maven { url 'https://repo.spring.io/milestone' }
  maven { url 'https://repo.spring.io/snapshot' }
  maven { url "https://nexus.synload.com/repository/maven-repo-releases/" }
}
dependencies {
  implementation 'com.nucleodb:library:1.13.22'
}

Create models

Models consist of 2 classes, the DataEntry class that wraps the data class.

Data Class

import com.nucleodb.library.database.tables.annotation.Table;
import java.io.Serializable;

@Table(tableName= "book", dataEntryClass = BookDE.class)
public class Book implements Serializable{
  private static final long serialVersionUID = 1;
  @Index String name;
  public Book(String name){
    this.name = name;
  }
  ....getters/setters
}

Data Entry Class

import com.nucleodb.library.database.index.annotation.Index;
import com.nucleodb.library.database.tables.table.DataEntry;
import com.nucleodb.library.database.modifications.Create;

public class BookDE extends DataEntry<Book>{
  private static final long serialVersionUID = 1;
  public BookDE(Book obj) {
    super(obj);
  }

  public BookDE(Create create) throws ClassNotFoundException, JsonProcessingException {
    super(create);
  }

  public BookDE() {
  }

  public BookDE(String key) {
    super(key);
  }
}

Instantiate the database

NucleoDB nucleoDB = new NucleoDB(
    NucleoDB.DBType.NO_LOCAL, // no local cache
    "com.package.location"
);
DataTable table = nucleoDB.getTable(Book.class); // get the table by the table class

Database usage

Looking up by index using get({key}, {value})

// saving/inserting
BookDE book = new BookDE(new Book("The Grapes of Wrath"));
table.saveSync(book);

// read only access
Set<DataEntry> entries = table.get("name", "The Grapes of Wrath");

// write access
Set<DataEntry> entries = table.get("name", "The Grapes of Wrath", new DataEntryProjection(){{
  setWritable(true);
  setLockUntilWrite(true); // cluster wide lock for entry until save (or 2 second timeout)
}});

// delete
BookDE book = (BookDE) entry;
table.deleteSync(book.copy(BookDE.class, true));