UnitOfWork.java

package com.smt.todo.model;

public class UnitOfWork {
    private static UnitOfWork soleInstance = null;

    private FinderInterface finder;

    public static UnitOfWork getInstance() {
        UnitOfWork.initialize();
        return UnitOfWork.soleInstance;
    }

    private static void initialize() {
        if (UnitOfWork.soleInstance == null) {
            try {
                UnitOfWork.soleInstance = new UnitOfWork();
            } catch (Exception e) {
            }
        }
    }

    public UnitOfWork() throws Exception {
        if (UnitOfWork.soleInstance != null) {
            throw new Exception("Singletons MUST be single!");
        }
        this.configure();
    }

    private void configure() {
        this.finder = new DummyTodoFinder();
    }

    public FinderInterface getFinder() {
        return this.finder;
    }
}