Examples with VFactory de.fhg.igd.mongomvcc.VFactory used on opensource projects

Example 1 with VFactory

use of de.fhg.igd.mongomvcc.VFactory in project mongomvcc by igd-geo.

the class FiveMinutes method main.

/**
 * Runs the tutorial
 * @param args the program arguments
 */
public static void main(String[] args) {
    // 1. Connect to a database
    VFactory factory = new MongoDBVFactory();
    VDatabase db = factory.createDatabase();
    db.connect("mongomvcc-five-minutes-tutorial");
    // Checkout the "master" branch
    VBranch master = db.checkout(VConstants.MASTER);
    // 2. Put something into the index
    VCollection persons = master.getCollection("persons");
    Map<String, Object> elvis = factory.createDocument();
    elvis.put("name", "Elvis");
    elvis.put("age", 3);
    persons.insert(elvis);
    // insert another person
    persons.insert(factory.createDocument("name", "Peter"));
    // 3. Commit index to the database
    long firstCid = master.commit();
    // 4. Read documents from the database
    VCursor c = persons.find();
    for (Map<String, Object> person : c) {
        System.out.print("Person { name: " + person.get("name"));
        if (person.containsKey("age")) {
            System.out.print(", age: " + person.get("age"));
        }
        System.out.println(" }");
    }
    Map<String, Object> elvis2 = persons.findOne(factory.createDocument("name", "Elvis"));
    if (elvis2 != null) {
        System.out.println("Elvis lives!");
    }
    // 5. Make another commit
    persons.insert(factory.createDocument("name", "Max"));
    elvis.put("age", 4);
    persons.insert(elvis);
    master.commit();
    // 6. Checkout a previous version
    System.out.println("There are " + persons.find().size() + " persons");
    Map<String, Object> elvis3 = persons.findOne(factory.createDocument("name", "Elvis"));
    System.out.println("Elvis is now " + elvis3.get("age") + " years old");
    VBranch oldMaster = db.checkout(firstCid);
    VCollection oldPersons = oldMaster.getCollection("persons");
    System.out.println("Previously, there were only " + oldPersons.find().size() + " persons");
    Map<String, Object> oldElvis = oldPersons.findOne(factory.createDocument("name", "Elvis"));
    System.out.println("Last year, Elvis was " + oldElvis.get("age") + " years old");
    // 7. Drop the database
    db.drop();
}