System Architectureand Wire Frames

Rider/Driver

Major Modules Cloud

Google Maps

Personal Data

Routing Data

Phone Interfaces

Browser Interface

• Drivers and Riders use a common interface that can run on either a phone (iPhone, Android, SMS) or a browser (Firefox, Explorer, Chrome). We can start with just a browser, usable on smart phones.• Requests for service and profile modification are recorded in the personal data base which is kept synchronized

between the interface device and the cloud.• The Trip Manager is communicates with all active users, receiving location information and coordinating real-

time communication.• Matches are performed in the Routing Data module which uses Google Maps for basic services but maintains a

large graph of all trips planned or requested.• Google Maps is also used to create presentations for the interfaces.• Italics designates outsourced modules.• Not all connections are shown.

Billing System

SMS Service

Mail Service

Trip Manager Traffic

Monitor

BoE Data Requirements

• Each user requires a negligible amount of data, easily held on a smart phone: contact information, current co-ordinates, social network, preferences, current plans, past trips

• The Routing Data base might be big.– For every existing street segment or planned traverse of a street

segment, 103 bytes– Manhattan has over 125 cross streets and 12 avenues, so it has over

2*125*12 = 3,000 street segments– Suppose 10% of our N customers have 20-block trips in the data base

at any time. 2*N planned segment traverses.– 103*(3000+2*N) = 3*106+2*103*N = 3*106+2*106*(N/103)

= 3 + 2*n MB for n thousand users. – For 1 million users, about 2GB—still not much.

BoE Processing Requirements

• We’d like instantaneous response for active users, but network delays will probably dominate, so programming convenience is probably the more important consideration. Dedicate a virtual processor to each one.

• Suppose .01% of 106 users are active at a time. Requires 100 processes = 100 Heroku Dynos and 100 Heroku Workers. About $6,000 per month.

Start time: (now)

Date: (today)

End place:

Start place: (here)

Return start time:*

Repeat* Daily

MTWTF

Weekly

Ride Offer

Make Offer

Specify Route

Ask per trip: $

Date: <rider’s date>Time: <rider’s time>Start:<rider’s place>End: <rider’s destination>Offer: $ <rider’s offer>Name:<rider’s name>*Cell: <rider’s cell>*Email: <rider’s email>*

Send

My email

Ride Request for You

My Name

My cell

Yes

Maybe

Message

No

Start time: (now)

Date: (today)

End place:

Start place: (here)

Return start time:*

Repeat* Daily

MTWTF

Weekly

Ride Request

Request

Offer per trip: $

Xxx: (preset)

Xxx: (preset)

Xxx:*

Xxx: (preset)

Xxx

Xxx

Title

Xxx

Xxx

XXX

Details:

Confirm Ride

Send

The ride was…

bad

aborted

good

<day><time><start><end><people….>

Email:

Name:

Birthday:*

Cell Phone:

Profile

(X)

Use for real-timecommunication

I would drive*

if it took less than

Gender*

(10)extra minutes.

I would charge the rider $ (1.00)

plus $ (0.00) per mile

I would ride*

if it took less than (10)extra minutes.

I would pay the driver $ (1.00)

plus $ (0.00) per mile

FemaleMale

Prefer Female RidersMale Riders

Prefer Female DriversMale Drivers

Submit

Password:

Set Billing Information

Link to Facebook