AsyncLoginUpdater.java

package com.airlocksoftware.hackernews.loader;

import java.util.Calendar;

import org.apache.commons.lang3.StringUtils;

import android.content.Context;
import android.os.AsyncTask;

import com.airlocksoftware.hackernews.data.LoginManager;
import com.airlocksoftware.hackernews.data.UserPrefs;

/**
 * Responsible for updating the user cookie in the background. It gets started by the MainActivity, and should run once
 * a week.
 **/
public class AsyncLoginUpdater extends AsyncTask<Void, Void, Void> {

	Context mApplicationContext;
	public static final long COOKIE_EXPIRATION = 1000 * 60 * 60 * 24 * 7; // one weeks

	/** Be sure to use an Application context in case of rotation happening while this is running **/
	public AsyncLoginUpdater(Context applicationContext) {
		mApplicationContext = applicationContext;
	}

	@Override
	protected Void doInBackground(Void... arg0) {
		UserPrefs prefs = new UserPrefs(mApplicationContext);
		long timestamp = prefs.getCookieTimestamp();
		String username = prefs.getUsername();
		String password = prefs.getPassword();
		long currentTime = Calendar.getInstance()
																.getTimeInMillis();
		boolean expired = currentTime - timestamp > COOKIE_EXPIRATION;
		if (expired && StringUtils.isNotBlank(username) && StringUtils.isNotBlank(password)) {
			String newCookie = LoginManager.login(username, password);
			if (newCookie != null) {
				// saves new user cookie and updates the timestamp
				prefs.saveUserCookie(newCookie);
			}
		}
		return null;
	}

}