Vakgroep Informatietechnologie Deel III: Paradigma’s Software Ontwikkeling 4. Ontwerp van Telecom...

Vakgroep Informatietechnologie

Deel III: Paradigma’s Software Ontwikkeling

4. Ontwerp van Telecom Services

Prof.Dr.Ir. Filip De Turck

Domotica Telecom Services

Software Ontwikkeling I

Home Use case

Television

Service GatewaySiemens Pylix / Porta

RFID reader

User with tag and PDA

Multimedia Content Provider

Need for User Priorities

Television

RFID reader

User Priority

Service GatewaySiemens Pylix / Porta

Home Use Case (with user priorities) :

User Policies are not

supported in OSGi

-> research topic

Need for Service Priorities

User with PDA

Television

Service Gateway

RFID reader

End user Service

Priority

Video on demand

Surveillance 9

User without valid RFiD tag

Home Surveillance

Service

1DANGER

DANGER

Home Use Case (with user priorities) :

User with PDA

Television

Service Gateway

RFID reader

End user Service

Priority

Video on demand

Surveillance 9

User without valid RFiD tag

Home Surveillance

Service

1DANGER

DANGER

Home Use Case (with service priorities) :

Technical realization of user and service policy enforcement

Television

Service Gateway Multimedia Content Provider

End user Service

Priority

Video on demand

Surveillance 9

Home Surveillance

Service

UPnP Media Streamer

UPnP Media Render

OSGi Service Gateway

Home networks

Intelligente Router Gateway tot het home netwerk Besturing security systeem

Software + framework Complete afscherming

gebruiker (black box)

Home netwerk Apparaten Protocollen

Vermelde technologieën X10 OSGi

Software

Elektriciteitsnet

Intelligente router

Apparaat

X10 Controller

X10 Module

Lichtnet

opdracht

adres commando Voor mij?

Cross compiling

Makefile

CC=/usr/crossdev/mips/bin/mips-linux-gccLD=/usr/crossdev/mips/bin/mips-linux-ldall: testtest: test.c $(CC) -g -c test.c $(LD) -o test test.o –lc –lx10# $(CC) -static -o test test.c libx10.aclean: rm -f test *.o

Example Code#include <stdio.h>#include "x10_api.h"

void new_error_handler(int code, char *arg, struct x10_status_t *status);

void function_hook(unsigned char house, int unit, int function, int dim_level, struct x10_status_t *status);

int main(int argc,char **argv) { struct x10_status_t *status; int return_code;

/* We open the API */ if(!(status=x10_open("/dev/ttyS0", new_error_handler,

function_hook, 10000000))) { fprintf(stderr,"Could not open the serial port %s !\

n",argv[1]); exit(1); }

printf("\n\nNow turning ON the A5 module ...\n"); return_code = x10_send_cmd('A', 5, X10_CMD_ON, 0, status); printf("x10_send_cmd return code = %d\n",return_code);

x10_close(status);}

Enabling Java-based VoIP backend platformsthrough JVM performance tuning

Outline

Introduction Java 4 Telecom Evaluation Setup Java Virtual Machine

Default behavior Possible Optimizations Optimized Behavior

Results Conclusions

Introduction

Software backend platforms are increasingly popular in VoIP offerings.

Java is currently one of the most popular programming languages for implementing business logic.

Is Java suitable for implementing VoIP and telecom related applications?

Java Application Servers for Telecom related applications are emerging: SIP Servlet JAIN SLEE

Telecom Applications: VoIP

Telecom related applications have very specific requirements Low Latency High Throughput

Example: Softswitch How fast can it set up a call? How many calls can in set up per second?

Java 4 Telecom?

Java Virtual Machine: Features

Java Byte Code is executed by a virtual Machine This makes it platform independent

Java features automatic Memory Management and a Garbage Collector This simplifies the task of the developer

Java Virtual Machine: Problems

Java Byte Code is executed by a virtual Machine This can be a performance penalty

Java features automatic Memory Management and a Garbage Collector This can cause a performance penalty due to

unpredictable behavior of the system.

Evaluation: Proxy 200 benchmark

OK [200]

Ringing [180]

Trying [100]Invite

Invite

Ringing [180]

OK [200]

Media transfer

Alice Proxy Bob

Measured Time Interval

No Media Session started when

benchmarking

Evaluation Setup: Hardware

Perform routing

Internet

Dual Opteron1.6Ghz 2GB RAMLinux kernel 2.6

Evaluation Setup: Software

SIP Servlet BEA Weblogic SIP Server

JAIN SLEE Open Cloud Rhino

Benchmark software SIPp (test tool / traffic generator for the SIP

protocol)

SIP Servlet: Architecture

Container basedLife cycle managementManage network listen

points

Very similar to HTTP-Servlet

SIP Protocol SpecificRequest Response

Model Container

JAIN SIP Servlet API

SIP Stack

Application

ApplicationApplication

Application client

SIP Servlet Server

Container

SIP Stack

Application

Container

SIP Stack

Application client

SIP Servlet Server

JAIN SLEE: Architecture

Container basedLife cycle management

Protocol AgnosticResource Adaptors

allow protocols to be “plugged in”

Manage network Listen Points

Event driven and asynchronous

JAIN SLEEContainer

JAIN SLEE SBB API

SIP RA

JAIN SIP

Application

JCC RA

JAIN JCC

JAIN SLEE Server

JAIN SLEEContainer

JAIN SLEE SBB API

SIP RA

JAIN SIP

Application

JCC RA

JAIN JCC JAIN SLEEContainerJAIN SLEEContainer

JAIN SLEE SBB API

SIP RA

JAIN SIP

SIP RA

JAIN SIP

ProxyProxy

Application

JCC RA

JAIN JCC

JCC RA

JAIN JCC

JAIN SLEE Server

Application client

0 50 100 150 200 2500

Call Rate (caps)

Response time as a function of call rate and system load

0 50 100 150 200 2500

Average response time

50th percentile95th percentile

System load

Results: SIP Servlet (default)

Cause of the problems?

Memory Management and Garbage Collector

Legend

Heap Usage

GC-Time

GC-occurrence

Tenured Gen.

Young Gen.

long lasting GC

heap resizing

low response time

Image created with gcviewer (http://www.tagtraum.com/gcviewer.html)

Solution: Virtual Machine Tuning

Memory Organization

Garbage Collection

Young generation

Tenured generation

Perm generationTiny Survivor Spaces

Memory Tuning

Fixed Young Generation Size

Total Heap Size large enough

Other Generation Sizes NOT Fixed

Default

All generations

Parallel &Concurrent

All generations

Concurrent

Only for tenuredgeneration

Parallel

Only for younggeneration

Garbage Collector Tuning

Long GC pauses

Multi-threaded GC

GC partially parallel with Application Execution

Performance implications:More resources are spent on Garbage Collection

Tuning Options

-Xmx512m -XX:MaxNewSize=32m -XX:NewSize=32m

-XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:+CMSIncrementalPacing -XX:CMSIncrementalDutyCycleMin=0 -XX:CMSIncrementalDutyCycle=10

-XX:+UseTLAB

-XX:MaxTenuringThreshold=0 -XX:SurvivorRatio=128

Sizing of the memory

generations

Selection of the Garbage Collector

Allow multi-threaded memory

allocation

Move long living objects to Tenured

Generation

Problems solved?

Legend

Heap Usage

GC-Time

GC-occurrence

Tenured Gen.

Young Gen.

No long lasting GC

No heap resizing

low response time

Image created with gcviewer (http://www.tagtraum.com/gcviewer.html)

Results: SIP Servlet

0 50 100 150 200 2500

Call Rate (caps)

0 50 100 150 200 2500

System load

Higher CPU load

Improved Latencies

Results: JAIN SLEE (untuned)

0 50 100 150 200 2500

Call Rate (caps)

0 50 100 150 200 2500

System load

Results: JAIN SLEE

0 50 100 150 200 2500

Call Rate (caps)

0 50 100 150 200 2500

System load

Conclusions

Java Technologies can simplify the Design and Management of Telecom and VoIP related applications

Java Virtual Machine Tuning can improve the Java Garbage Collection significantly

Java Application Servers combined with appropriate tuning can meet strict Low Latency Requirements

Telecom Services on handheld devices

Handheld devices – different OS

In-house / specificWindows Mobile

Symbian OSEmbedded Linux

Palm OSBlackBerry

Handheld devices – J2ME

Device / Hardware

Native Operating System

Configuration

ProfileOptional

Packages

Vendor-specificclasses

Applications

• modular and scalable architecture

• Configuration: CLDC / CDC

• Profiles: MIDP / FP / P (basis) P

• Mobile phones: MIDP 2.0

CLDC 1.1

“MIDlet (suite)”

• WMA, MMAPI, Bluetooth APIs

• Nokia UI

Handheld devices – J2ME

Development steps for a MIDP application

1. Compilation using an ordinary Java compiler

2. Conversion of the classes to CLDC format (preverification)

3. Creation of the manifest file

4. Packaging into a JAR-file (+ creation of the JAD-file)

5. Installation onto the target device

- through WAP

- through PC-connection (e.g. Nokia’s PC Suite)

SUN’s WTK

IDE Netbeans Mobility Pack

Handheld devices – J2MECode Examples

• Webaccess - through HttpConnection String getViaHttpConnection(String url) throws IOException { HttpConnection c = null; InputStream is = null; StringBuffer str = new StringBuffer(); try { c = (HttpConnection)Connector.open(url); // Getting the InputStream will open the connection and read the HTTP headers.

// They are stored until requested. is = c.openInputStream(); // Get the length and process the data int len = (int)c.getLength(); int ch; while ((ch = is.read()) != -1) { str.append((char)ch); } } finally { if (is != null) is.close(); if (c != null) c.close(); }

• SIP - JSR 180 “SIP API for J2ME”

- defined as Optional Package

- minimum requirements: CLDC 1.0

public void sendTextMessage(String msg) {

SipClientConnection sc = null;

// open SIP connection

sc = (SipClientConnection) Connector.open("sip:sip.example@host.com:5060");

// initialize SIP request MESSAGE

sc.initRequest("MESSAGE", null);

// set some headers

sc.setHeader("From", "sip:user@host.com");

sc.setHeader("Subject", "testing...");

...// write message bodysc.setHeader("Content-Type", "text/plain");sc.setHeader("Content-Length", Integer.toString(msg.length()));OutputStream os = sc.openContentOutputStream();os.write(msg.getBytes());os.close();// close stream and send the message to the network// wait max 15 seconds for responsesc.receive(15000);// response receivedif(sc.getStatusCode() == 200) {

// handle 200 OK response } else {

// handle other responses } sc.close();

} catch(Exception ex){// handle Exceptions }

Video Service - JSR 135 MMAPI (Mobile Media API)- provides a framework for playing media content - designed to run with any protocol and format

The method below plays a video file the on mobile device:... Player p;VideoControl vc;try {

p = Manager.createPlayer(“rtsp://server/somemovie.mpg");p.realize();// get video controlvc = (VideoControl) p.getControl("VideoControl"); .... p.start();

} catch(IOException ioe) { } catch(MediaException me) { } ...

Note: This will only work on devices which support real time input streams!

Handheld devices -Windows CE

Windows CE = a modular OS that serves as the foundation of several classes of devices

Windows Mobile = a subset of platforms based on Windows CE

- high market share in the PDA market (~50%)

- 2003 - Pocket PC

- Smartphone

- Pocket PC Phone Edition

- 5.0 - Pocket PC

- Smartphone

- Portable Media Center

The Operating System

Handheld devices - Windows CE

Software development

• native code - Visual C++

- high performance

- direct hardware access

- smallest footprint

• managed code through the .NET CF

- Visual Basic and Visual C#

- Rapid Application Development

- No bad pointers or memory leaks

- subset of the .NET framework

- base class libraries + few additional libraries

- 2 versions : 1.0 (2003 / 2003 SE) & 2.0 (5.0)

.NET Compact Framework

VisualC#

Visual Basiccode

Compiler

Common Intermediate

Language

Common Intermediate

Language

Common Intermediate

Runtime

Common Intermediate

Runtime

01110100101011010101

Common Language Infrastructure

Handheld devices - Windows CECode Examples

• Webaccess - through System.Net.WebClient The following example takes the URI of a resource, retrieves it, and displays the response.

…if (args == null || args.Length == 0) { throw new ApplicationException ("Specify the URI of the resource to retrieve."); } WebClient client = new WebClient ();

// Add a user agent header in case the requested URI contains a query. client.Headers.Add ("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT

5.2; .NET CLR 1.0.3705;)");

Stream data = client.OpenRead (args[0]); StreamReader reader = new StreamReader (data); string s = reader.ReadToEnd (); Console.WriteLine (s); data.Close (); reader.Close (); }…

• SIP

• Since Windows CE 4.2 : VoIP TUI is a fully functional, customizable, and extensible suite of common telephony features for users.

• Third party SIP API : http://www.independentsoft.com/

RTC API Core

Transmission Control Protocol/Internet Protocol (TCP/ IP)

Media Manager

Windows CE .NET VoIP Middleware(incl. VoIPMgr)

DatabasesProvisioners

MS RTP

Windows CE .NET VoIP UIWindows CE .NET User

Application3rd Party User Applications

Point-To-Point Protocol (PPP)

Serial Drivers

Network Driver Interface Specification(NDIS)

Hardware

using Independentsoft.Sip;

using Independentsoft.Sip.Sdp;

client = new SipClient("sipdomain.com","Bob","password");

client.ReceiveRequest += new ReceiveRequestEventHandler(OnReceiveRequest);client.ReceiveResponse += new ReceiveResponseEventHandler(OnReceiveResponse);

client.Connect();client.Register("sip:test.com", "sip:Bob@test.com", "sip:Bob@test.com");

Console.WriteLine("Send message to Alice or press \"q\" to exit.");string message = "";

while(message != "q"){Console.Write("Bob:");message = Console.ReadLine(); client.SendMessage("sip:Bob@test.com","sip:Alice@test.com",message);}

client.Disconnect();}

private static void OnReceiveRequest(object sender, RequestEventArgs e) { client.AcceptRequest(e.Request);

if(e.Request.Method == SipMethod.Message){Console.WriteLine("Alice:"+e.Request.Body);}

Code Examples• Video service - through e.g. DirectX 9.0 SDK

using Microsoft.DirectX.AudioVideoPlayback;public class MyVideoPlayer : System.Windows.Forms.Form{ ... private void OpenFile() { try { Video ourVideo = new Video("C:\\Example.avi"); ... } } ... }

Handheld devices – Symbian OS

• multitasking OS designed for 2.5G and 3G mobile phones

• very high market share in the smartphone market (~70%)

• the successor of the Epoc OS

• started as version 6.0 and currently into version 9.2

• advanced, open standard OS to its licensees

• (Sony) Ericsson, Nokia, Panasonic, Samsung and Siemens

• software development: J2ME and Symbian C++

The Operating System

• ≠ standard C++

• offers highest performance and functionality on Symbian OS

• 4 standardized software frameworks

Resolution (pixels) User Interaction

UIQ 208-240 x 320pen-based

(+ small keyboard)

Series 60 176 x 208 central navigation key

Series 80 / 9200 Series 640 x 200 full keyboard

Series 90 640 x 320 pen-based

Symbian C++

• code not complete portable between the different frameworks ( ~ 80 %)

Code Examples

• Webaccess

void CHttpClient::InvokeHttpMethodL(const TDesC8& aUri, RStringF aMethod) { ... TUriParser8 uri; uri.Parse(aUri); RHTTPTransaction trans = iSession.OpenTransactionL(uri, *iTransObs, aMethod); ... };

- creating a transaction

- opening a session

class CHttpClient : public CBase, ... {...

private: RHTTPSession iSession; ... };

CHttpClient::CHttpClient() {... iSession.OpenL();

Code Examples

• SIP - Nokia plugin for Series 60, 2nd Edition

- integrated in Series 60 Platform, 3rd Edition (v9.1)

iSIP = CSIP::NewL(KAppUid, *iMySIPObserver); iConnection = CSIPConnection::NewL(*iSIP, KIapIdentifier, *iMyConnectionObserver);

- initiation of the SIP client API

- registration of a SIP user

CleanupStack::PushL(aor);

CSIPAddress* addr = CSIPAddress::DecodeL(_L8("sip:user@host.com"));

CleanupStack::PushL(addr);

CSIPContactHeader* contact = CSIPContactHeader::NewL(addr);

CleanupStack::Pop(addr);

CleanupStack::PushL(contact);

CSIPRefresh* refresh = CSIPRefresh::NewLC(); iRegistration =

CSIPRegistrationBinding::NewL(*iConnection, aor, contact, refresh);

CleanupStack::Pop(3);

Code Examples• Video service - CVideoPlayerUtility provides a simple interface to

open, play and obtain information from sampled video data. The video data can be supplied either in a file, a descriptor or a URL

- streaming supported ( MVideoLoadingObserver)

class CRMMVideoRenderer : public CBase, public MVideoPlayerUtilityObserver, public MVideoLoadingObserver {private: CVideoPlayerUtility* iVideoPlayerUtility; …}

…iVideoPlayerUtility = CVideoPlayerUtility::NewL( *this, iPriority, iPref, iWindowSession, *iScreenDevice, iDisplayWindowhandle, iDisplayWindowRect, iClipWindowRect )

…// turn on the status reporting for connecting, buffering, and re-bufferingiVideoPlayerUtility->RegisterForVideoLoadingNotification(*this);

…// load a videostreamTRAPD( err, iVideoPlayerUtility->OpenUrlL( iUrl, iIapId, iMimeType, iControllerUid ) ); if ( err != KErrNone ) {

iObserver->ErrorMsg(err);}

Vakgroep Informatietechnologie Deel III: Paradigma’s Software Ontwikkeling 4. Ontwerp van Telecom...

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