Dripcast

Server-less programming framework for ANDROID  

Ikuo Nakagawa Dripcast Project

Dec., 2011  

between concentration and distribution, local and in-house toward global and scalable, we focus in cloud-full computing model, data store and data process on a cloud, and

server-less programming model, e.g., transparent method call without thought of servers

Changes of computer models  

Dec., 2011   © Dripcast Project   2  

global  

local  

distribute  

concentrate  

10 : 1   1K : 10   1M : 100   1B : 10K   1T : 1M  # of devices and processing nodes  

3 layer model (client-server-database)  Host   server-less  Programming model  

biz. trend is here.  

Host computer client and server   PC + Web   smartphone + cloud   device + cloud  Computing model  

tech. trend touches here.  

Our computing model, is...  

Dec., 2011   © Dripcast Project   3  

Today, device + cloud communication style is ready for new applications. Computing model is "cloud-full" and Programming model is "server-less". Cloud platform technologies change the concept of "network" application.

computer resources on a cloud with

unlimited data space unlimited processing space

server-less programming

model  

Today's topic  

cloud-full computing

model  

Server-less programming  

Dec., 2011   © Dripcast Project   4  

"Bibbidi-Bobbidi-Boo"

(also called "The Magic Song")

is a novelty song, written in 1948 by Al Hoffman, Mack David, and Jerry Livingston.

It was introduced in the 1950 Disney film Cinderella, performed by actress Verna Felton.  

Bibbidi-Bobbidi-Boo  

Dec., 2011   © Dripcast Project   5  

// an instance we want to handle. Gadget a = new GadgetImpl();

// store out value to the object, at first. a.setValue(31);

// now, verify input against our value. String s = in.readLine(); if (Integer.parseInt(s) == a.getValue()) { System.out.println("Great! Lucky guess!"); } else { System.out.println("No match. Sorry."); }

interface Gadget { void setValue(int val); int getValue(); }

class GadgetImpl implements Gadget { private int value = 0; public void setValue(int val) { value = val; } public int getValue() { return value; } }

defining "how to access"

your data object.  

defining "what to do"

when you call it.

write your code via interface.

it's Java ! Try, 3 minutes hacking...  

Let's make an object to be cloud-enabled.

Bibbidi-Bobbidi-Boo  

Dec., 2011   © Dripcast Project   6  

// an instance we want to handle. Gadget a = new GadgetImpl();

// store out value to the object, at first. a.setValue(31);

// now, verify input against our value. String s = in.readLine(); if (Integer.parseInt(s) == a.getValue()) { System.out.println("Great! Lucky guess!"); } else { System.out.println("No match. Sorry."); }

interface Gadget { void setValue(int val); int getValue(); }

class GadgetImpl implements Gadget { private int value = 0; public void setValue(int val) { value = val; } public int getValue() { return value; } }

defining "how to access"

your data object.  

defining "what to do"

when you call it.

write your code via interface.

it's Java !

// Biddidi-Bobbidi-Boo. a = B3.setAndAttachInstance( key, Gadget.class, a);  

creating your data object on a cloud.  

executing your method (request)

on a cloud, as well.  

What you need to do, is only casting a spell "Bibbidi-Babbidi-Boo" !  

Android device (application)  

Cloud (platform)  

your data object  

Try, 3 minutes hacking...  

Changes

So, what's happen in Android application world ?  

Example of "sharing GPS location" application  

Dec., 2011   © Dripcast Project   8  

public class YourActivity implements Activity, LocationListener { UUID key = UUID.fromString("your-group-UUID"); // to share an object between group members. NavigableMap map; // will be associated with a cloud object, e.g., cloud-enabled. String id; // to store my phone number.

public void onCreate() { map = B3.createOrAttachInstance(key, NavigableMap.class, "java.util.TreeMap"); id = ((TelephonyManager)getSystemService(TELEPHONY_SERVICE)).getLine1Number(); ((LocationManager)getSystemService(LOCATION_SERVICE)).requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, this); }

public void onLocationChanged(Location location) { int x = (int)(location.getLatitude() * 1E6); int y = (int)(location.getLongitue() * 1E6) map.put (id, x + "," + y);

// show, your members positions.... Entry entry = map.firstEntry (); while (entry != null) { // show id and location : entry.getValue() entry = map.higherEntry (entry.getKey()); } } }

getting GPS info of your party members

GPS info  

It takes only 3 minutes to implement an application to share GPS info via the cloud. You only need to define class to hold location information (in Java), and share an instance.

No SQL/table definition nor REST/HTTP implementation would be required.

your-group-UUID

unique object on a cloud  

store your GPS info  

our models are ;

cloud-full computing and

server-less programming  

Existing Develop. model

Cloud style Develop. model

GUI / Design  tables (RDB)  

Application logic  

server side (Servlet)

GUI / Design  

Application logic  

processing and storing on the cloud, automatically.

client-server communication

server-RDB communication

Write as easy as local. NO skill is required for

SQL/database nor even REST/HTTP.  

There is NO need to develop server side processing nor database programming. Our "Spell" delivers Java object into the cloud, both of for storing and processing.

You need only to develop application logic. It's very simple and efficient.

Server-less programming – forget about server side  

It's 10 times easier to develop an application. Focus on application logic. That's all.

Application logic  

Dec., 2011   9  © Dripcast Project  

Cloud Platform

No more servers nor back-end systems for developers  

Dec., 2011   © Dripcast Project   10  

Of course, there is no need to use SQL/RDB, Servlet nor REST/HTTP. that means, we don't have to learn more about,...

Oracle, MySQL, PostgreSQL, Ruby, python, php, apache or others.

No more server side technologies  

Feel it

See, more examples...  

Write your own classes #1 - Mailbox  

Dec., 2011   © Dripcast Project   12  

// CREATE a mail box. d.newInstance(mboxId, MailboxImpl.class);

// POST a message. Mailbox mb = d.attachInstance(mboxId, Mailbox.class); mb.post("hello world!");

// LIST messages. Mailbox mb = d.attachInstance(mboxId, Mailbox.class); int total = mb.size(); System.out.println("total " + total + " messages in mail box."); for (int i = 0; i < total; i++) { System.out.println("No." + i + ": " + mb.get(i); }

public interface Mailbox { int size(); String get(int index); void post(String msg); }

interface definition usage example

public class MailboxImpl implements Mailbox { private Map<Integer,String> mails = new TreeMap<Integer,String>(); private int tail = 0; public int size() { return tail; } public String get(int index) { if (index < 0 || index >= tail) throw new IllegalArgumentException(); return mails.get(index); } public void post(String msg) { mails.put(tail, msg); tail++; } }

implementation class

Write your codes, as easy as local, with server-less style.

Write your own classes #1 - Mailbox  

Dec., 2011   © Dripcast Project   13  

// SEARCH messages for a given keyword. SearchableMailbox mb = d.attachInstance(id, SearchableMailbox.class); List<Integer> list = mb.search("Japan"); System.out.println("total " + list.size() + " messages found."); for (int i : list) { System.out.println("No." + i + ": " + mb.get(i); }

public interface SearchableMailbox extends Mailbox { List<Integer> search(String keyword) throws IOException; }

interface definition usage example

use huge amount of computer resources, for your process !

public class SearchableMailboxImpl extends MailboxImpl implements SearchableMailbox { public List<Integer> search(String keyword) throws IOException { int total = size(); List<Integer> ret = new LinkedList<Integer>(); for (i = 0; i < total; i++) { if (get(i).indexOf(keyword) >= 0) { list.add(i); } } return list; } }

implementation class

execute your request on the cloud

Inside Dripcast

basic architecture of Dripcast mechanism  

Configuration of the cloud #1  

Dec., 2011   © Dripcast Project   15  

Smartphone

Dripcast client   Dripcast engine   EXAGE / Storage  

Process space Storage space

In a typical configuration, Smartphone works with Dripcast client, and a cloud have Dripcast engine with scale-out style storage, EXAGE / Storage by Intec.

both of processing space and storage space are scalable.

Very simple application framework for

ANDROID/Java. it's server-less programming  

Engine of the framework, provides interfaces for

storing and processing data. it's Platform (aka PaaS)  

Scale-out style storage (by Intec, Inc.)

provides unlimited scalable storage space.  

Dripcast cloud  

Configuration of the cloud #2  

Dec., 2011   © Dripcast Project   16  

Smartphone

Dripcast client   Dripcast engine  

Process space Storage space

In a typical configuration, Smartphone works with Dripcast client, and a cloud have Dripcast engine with scale-out style NoSQL, Cassandra,

both of processing space and storage space are scalable.

Very simple application framework for

ANDROID/Java. it's server-less programming  

Engine of the framework, provides interfaces for

storing and processing data. it's Platform (aka PaaS)  

Scale-out style NoSQL (open source software)

provides unlimited scalable data space.  

Dripcast cloud  

Cassandra is available as back-end store

F.Y.I. Configuration on the NOAH cloud  

Dec., 2011   © Dripcast Project   17  

We have 4 relay servers and 16 engines on the NOAH cloud for multi-tenant services. It's easy to configure and setup Dripcast systems on the NOAH cloud.

Just start a new server with Dripcast template.

parallel & distributed processing

storage & processing

distribution + auth.

application features application

We appreciate to

for our cloud style computer resources on

If you'd like to have your account on the Dripcast cloud, please contact to the Dripcast project.

Service sites for Dripcast  

Dec., 2011   © Dripcast Project   18  

Dripcast may have lots of services in its architecture, based on "service name". A client simply selects "service name" when it initializes the Dripcast.

Services may have completely separated operational domains and hardwares.

Dripcast.openConnection("noahcloud");  

Dripcast.openConnection("your-cloud");  your own Dripcast cloud

NOAHCLOUD  

default site  

If you'd like to have your own Dripcast cloud, please contact to the Dripcast project.

Activity

Research project started in academic + industrial organizations  

F.Y.I. - Research project started for Dripcast  

Dec., 2011   © Dripcast Project   20  

"live on cloud, play on device"

1. Research a new development style of "device + cloud". optimize data model & processing model of direct access to cloud objects.

2. Deploy and standardize very easy and simple development model. For several languages and environments. "dripcast" is one of such impl. for Java.

3. Evaluate and feedback of new style cloud platform service. Application (providers, developers) and Platform (network, IDC, cloud operators).

Our goal is :  

Research project for server-less programming model  

Thanks for participating our project. Smart Technologies, A.T.Works,

NOAH Cloud (IDCF), and many organizations will join us !

Demonstration site available, soon. Visit http://dripcast.org

for more details.

Dec., 2011   © Dripcast Project   21  

To feel "server-less" programming, visit

http://dripcast.org

download and put the SDK (dripcast-lib-x.y.z.jar)

into you CLASSPATH

try your sample code,

with Bibbidi-Bobbidi-Boo.

Demonstration site is available

Fin

Please contact to Ikuo Nakagawa, for more information.

Thank you.