RealmHelper class to create a singular place for handling Realm instances

RealmHelper.java

public class RealmHelper {

    private static RealmConfiguration config;

    private static Realm realmInstance;

    public static Realm getWriteInstance(Context context) {
        if (realmInstance == null || realmInstance.isClosed()) {
            // TODO: 15/10/15 Update the code to use Realm.isClosed()
            realmInstance = getInstance(context);
        }

        try {
            realmInstance.beginTransaction();
        } catch (IllegalStateException e) {
            Timber.e(e, "Realm already open for transaction");
            e.printStackTrace();
        }
        return realmInstance;
    }

    public static void commitTransaction() {
        if (realmInstance != null) {
            realmInstance.commitTransaction();
        }
    }

    public static Realm getReadInstance(Context context) {
        if (realmInstance == null || realmInstance.isClosed()) {
            realmInstance = getInstance(context);
        }
        return realmInstance;
    }

    public static void closeRealm() {
        if (realmInstance != null && !realmInstance.isClosed() &&
                !realmInstance.isInTransaction()) {
            realmInstance.close();
        }
    }

    private static Realm getInstance(Context context) {
        if (config == null) {
            config = new RealmConfiguration.Builder(context).deleteRealmIfMigrationNeeded().build();
        }
        return Realm.getInstance(config);
    }

    private RealmHelper() {
    }
}