Example of using Realm.waitForChange()/Realm.stopWaitForChange()

Example.java

// Create a background thread
RealmThread t = new RealmThread(realmConfig, new RealmRunnable() {
    @Override
    public void run(Realm realm) {
        do {
            // Do some work once, and every time the Realm changes
        } while (realm.waitForChange())
    }

});

t.start(); // Start the thread
t.shutdown(); // Quit the loop as soon as possible.

RealmThread.java

public final class RealmThread extends Thread {

    private final RealmConfiguration realmConfig;
    private final RealmRunnable task;
    private Realm realm;

    public RealmThread(RealmConfiguration realmConfig, RealmRunnable task) {
        super();
        this.realmConfig = realmConfig;
        this.task = task;
    }

    public RealmThread(RealmConfiguration realmConfig, RealmRunnable task, String threadName) {
        super(threadName);
        this.realmConfig = realmConfig;
        this.task = task;
    }

    @Override
    public void run() {
        realm = Realm.getInstance(realmConfig);
        if (task != null) {
            task.run(realm);
        }
        synchronized(this) {
            if (!realm.isClosed()) {
                realm.close();
            }
            realm = null;
        }
    }

    /**
     * Abort the Realm thread as soon as possibly.
     */
    public void shutdown() {
        synchronized (this) {
            if (!isAlive() || realm == null) {
                return;
            }
            realm.stopWaitForChange();
        }
    }

    // Runnable interface
    public interface RealmRunnable {
        void run(final Realm realm);
    }
}

@cmelchior please explain why we should quit the loop as soon as possible? Can I execute shutdown when I need unsubscribe from Realm changes notifications?