wwf/wcfbillatnapier.com/wwf_wfc_ppt.pdf · n s t a t e f u l f i r e w a l l n e t w o r k s e c u...

Buchanan

uchanan

Author: Prof Bill Buchanan

Name: Prof Bill Buchanan, C63

Email: w.buchanan@napier.ac.uk

Leader: Centre for Dist. Comp. & Security

Aims: WWF/WCF

Buchanan

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Windows Workflow Foundation

Buchanan

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l fire

Stateful firewall

What’s in it?

Common

workflow

technology

Process-

oriented view

of software

development

State machine

workflows

Sequential

workflows

Windows

Workflow

Foundations

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Stateful firewall

Workflow methodology

Traditional codingWorkflow creation

Trace for sequential and event-

driven code to make sure it is

working correctly

Define the flow of activities, either

for sequential flow or state-based

Activity 1

Activity 2

Activity n

Integrate activitiesCall methods

Create instances

Declare classes and methods

Write code

namespace WorkflowConsoleApplication4_state{

private void codeActivity5_ExecuteCode(object sender) { Console.WriteLine("Pass"); }

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Stateful firewall

Sequential workflow

Pick-up phone

Dial number

Wait for answer

Answer?

Hungry?

Order pizza

Take order

Order acceptedNo

Get ingredients

Handover pizza

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Stateful firewall

State-machine workflow

User is hungry

Handover pizza

Order pizza

Take orderRe-order pizzaAccept

No answer

Make pizza

successfu

Accept

answer

Delivery pizza

Address found

Get rid of

Address

not found

wanted

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Stateful firewall

Workflow types

Sequential

Workflow LibrarySharePoint State

Machine

SharePoint

Sequential

Workflow

State Machine

Workflow Library

Sequential Console

Application

State Machine

Workflow Console

Application

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Workflow layered architecture

· Workflows.

· Rules.

· Built-in activities.

· Custom activities.

· Workflow execution (Rules, tracking and scheduling).

· Workflow lifecycle (State, activation).

· Communication.

· Persistence.

· Tracking.

· Timer.

· Transactions.

· Threading.

Workflow Model

Runtime Layer

Hosting Layer

Host process

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Stateful firewall

Workflow layered architecture

· Workflows.

· Rules.

· Built-in activities.

· Custom activities.

· Workflow execution (Rules, tracking and scheduling).

· Workflow lifecycle (State, activation).

Workflow Model

Runtime Layer

WorkflowRuntime workflowRuntime = new WorkflowRuntime();

workflowRuntime.WorkflowCompleted += OnWorkflowCompleted;

workflowRuntime.StartRuntime();

WorkflowInstance workflowInstance =

workflowRuntime.CreateWorkflow(typeof(ActivityLibrary1.Activity1));

workflowInstance.Start();

Namespace Class

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Sequential WF

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Stateful firewall

When sequential?

Workflow has well-defined

stimulus's, which use well

structured methods to catch

When the sequence of

activities is well-known, and

follow a defined sequence

When the workflow does not

have any unexpected

changes in operation

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Stateful firewall

Sequential WF

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Stateful firewall

Sequential WF

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What’s required?

public sealed partial class Workflow1: SequentialWorkflowActivity

int i;

public Workflow1()

InitializeComponent();

private void codeActivity1_ExecuteCode(object sender, EventArgs e)

Console.WriteLine("Value less than 5");

Console.ReadLine();

private void codeActivity1_ExecuteCode_1(object sender, EventArgs e)

Console.WriteLine("Enter i>>");

i = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("Value greater than 5");

Console.ReadLine();

private void delayActivity1_InitializeTimeoutDuration(object sender, EventArgs

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Workflow

public sealed partial class Workflow1: SequentialWorkflowActivity

ArrayList primes1 = new ArrayList(); bool flag1=false;

ArrayList primes2 = new ArrayList(); bool flag2 = false;

for (ulong i = 3; i < 100; i++)

if (isprime(i)) primes1.Add(i);

this.flag1 = true;

public bool isprime(ulong val)

for (ulong i=2;i<val/2;i++)

if ((val % i)==0) return false;

return true;

for (ulong i = 100; i < 200; i++)

this.flag2 = true;

Console.WriteLine("0-100, No of primes=" + Convert.ToString(primes1.Count));

Console.WriteLine(Convert.ToString(primes1[0]+"..."+Convert.ToString(primes1[primes1.Cou

nt-1])));

Console.WriteLine("100-200, No of primes=" + Convert.ToString(primes2.Count));

Console.WriteLine(Convert.ToString(primes2[0]+"..."+Convert.ToString(primes2[primes2.Cou

nt-1])));

Console.ReadLine();

flag1 = false;

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Calling Workflow from another application

namespace ActivityLibrary1

public partial class Activity1: SequenceActivity

public ulong max=100;

public ArrayList primes1 = new ArrayList();

public bool flag1 = false;

public int primes

get { return primes1.Count; }

public object setmax

set { this.max = (ulong)value; }

get { return this.max; }

public Activity1()

for (ulong i = 3; i < this.max; i++)

this.flag1 = true;

for (ulong i = 2; i < val / 2; i++)

if ((val % i) == 0) return false;

return true;

Dictionary <string,object> parameters =

new Dictionary<string,object>();

parameters.Add("setmax", (ulong)400);

workflowRuntime.CreateWorkflow(

typeof(ActivityLibrary1.Activity1), parameters);

void OnWorkflowCompleted(object sender,

WorkflowCompletedEventArgs e)

primes = (int)e.OutputParameters["primes"];

max = (ulong)e.OutputParameters["setmax"];

flag1 = true;

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public int primes

public Activity1()

this.flag1 = true;

return true;

(Workflow)

Windows

Application

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public int primes

public Activity1()

this.flag1 = true;

return true;

(Workflow)

Windows

Application

Add reference to DLL

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public int primes

public Activity1()

private void codeActivity1_ExecuteCode(object sender,

EventArgs e)

this.flag1 = true;

return true;

namespace WindowsFormsApplication1

public partial class Form1 : Form

int primes = 0;

bool flag1 = false;

ulong max = 0;

public Form1()

private void button1_Click(object sender, EventArgs e)

WorkflowRuntime workflowRuntime = new WorkflowRuntime();

workflowRuntime.WorkflowCompleted += OnWorkflowCompleted;

workflowRuntime.StartRuntime();

Dictionary <string,object> parameters = new

Dictionary<string,object>();

parameters.Add("setmax", (ulong)400);

workflowRuntime.CreateWorkflow(typeof(ActivityLibrary1.Activity1),

parameters);

while (flag1 == false)

Thread.Sleep(100);

this.textBox1.Text = "The number of primes is " +

Convert.ToString(primes)+" and "+Convert.ToString(this.max);

void OnWorkflowCompleted(object sender,

WorkflowCompletedEventArgs e)

primes = (int)e.OutputParameters["primes"];

max = (ulong)e.OutputParameters["setmax"];

flag1 = true;

Windows

Application

Start Workflow engine

Define parameters

Start workflow

End of workflow

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Event-driven WF

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Stateful firewall

When event-driven?

The workflow is driven by

external events and/or

influencing entities

Used when there is some

human interaction with a

process involving a delay in

processing or in different

flow of activities

Possible ad-hoc transactions

as opposed to sequential

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State-based workflow

SetState: Changes the state of the state

machine from one state to another. StateInitialization: Defines

activities that that are executed

when a new state is entered.

EventDriven: Used to define a

transition when a specific

event is received, when in a

given state.

State: Defines a particular state in the

state machine.

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Console.WriteLine("Started...");

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Console.WriteLine("What is the capital of Scotland?");

string input = Console.ReadLine();

if (input == "edinburgh") endexam = true;

else endexam = false;

} while (endexam==false);

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Console.WriteLine("You have passed the exam");

Console.ReadLine();

Buchanan

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Windows Communications

Foundation

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Stateful firewall

What’s required?

Service-oriented

Architecture

(Services consumed

by consumers)

Consumer Consumer

Service

Application

Service

Service-oriented

Applications

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Stateful firewall

What’s required?

services

RemotingDistributed

Transactions

Message

Queues

Windows

Communications

Foundations

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Distributed

Systems

Service-oriented

Applications (SoA)

Service-oriented

Architecture

A (Address)

B (Binding) – Protocol: SOAP over HTTP,

SOAP over TCP, SOAP over MQ

C (Contract) – Each service exposes a

Contract via an endpoint. URL defined for

endpoint.

Web Service

Web Client

End pointWSDL

Info sent

Message

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Service-oriented

Distributed

Systems

Service-oriented

Applications (SoA)

Service-oriented

Architecture

Boundaries are explicit.

Service compatibility is

determined based on policy.

Services are autonomous

Services share schema and

contract, not class

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Service-oriented

Service

Intermediate

Client

Message

MessageMessage

Channels, Bindings, Contracts, Behaviours, Addresses and Endpoints.

Dealt with by WCF

Service

MessageMessage

Client

Service

A service becomes

a client

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5-layer WFC model

Application

Contracts

Runtime

Messaging

Hosting

This can be a range of hosts, such as

for Internet Information Services (IIS)

and starts and stops your services

automatically. Another is executable

files (.EXE) for the services are

started and stopped manually within

the code.

Supports difference channels and

encoders, and thus communication

for services.

This defines the behaviours within

services, which are loaded in this

layer.

In this layer services describe

themselves to clients. It defines data

and message contracts and bindings/

policies.

Applications are located at this layer.

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Practical Example

Service

Client

Capital(“scotland)

[ServiceContract]

public interface IService

[OperationContract]

public string GetCapital(string

Country);

ServiceHost svh = new

ServiceHost(typeof(ServiceImplementation));

svh.AddServiceEndpoint(

typeof(Tut1.Contract.IService),

new NetTcpBinding(),

"net.tcp://localhost:8080");

svh.Open();

System.Threading.Thread myCountryServer =

System.Threading.Thread(Tut1.Server.Program

.Main);

myCountryServer.IsBackground = true;

myCountryServer.Start();

ChannelFactory<Tut1.Contract.IService> scf;

scf = new

ChannelFactory<Tut1.Contract.IService>(

Tut1.Contract.IService s;

s = scf.CreateChannel();

“edinburgh”

Net.tcp://localhost:8080

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Practical Example

System.Threading.Thread myCountryServer = new

System.Threading.Thread(Tut1.Server.Program.Main);

System.Threading.Thread.Sleep(100);

scf = new ChannelFactory<Tut1.Contract.IService>(

while (true)

Console.Write("Enter a country: ");

string country = Console.ReadLine();

if (country == "") break;

string capital = s.Contact(country);

Console.WriteLine("The capital is " + capital);

[ServiceBehavior(InstanceContextMode =

InstanceContextMode.PerCall)]

class ServiceImplementation : Tut1.Contract.IService

public string Contact(string Country)

Console.WriteLine("Contacting server...");

if (Country == "scotland") return ("edinburgh");

else if (Country == "england") return ("london");

return "Not known";

public class Program

private static System.Threading.AutoResetEvent endServer =

new System.Threading.AutoResetEvent(false);

public static void Main()

new NetTcpBinding(), "net.tcp://localhost:8080");

svh.Open();

Console.WriteLine("Server running");

endServer.WaitOne();

Console.WriteLine("Server shutting down");

svh.Close();

Console.WriteLine("Server stopped");

using System.ServiceModel;

namespace Tut1.Contract

[ServiceContract]

[OperationContract]

string Contact(string message);

Buchanan

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Stateful firewall

Practical Example

Buchanan

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Stateful firewall

Practical Example

System.Threading.Thread myCountryServer = new

System.Threading.Thread(Tut1.Server.Program.Main);

System.Threading.Thread.Sleep(100);

scf = new ChannelFactory<Tut1.Contract.IService>(

while (true)

Console.Write("Enter a country: ");

string country = Console.ReadLine();

if (country == "") break;

string capital = s.Contact(country);

Console.WriteLine("The capital is " + capital);

[ServiceBehavior(InstanceContextMode =

InstanceContextMode.PerCall)]

class ServiceImplementation : Tut1.Contract.IService

public string Contact(string Country)

Console.WriteLine("Contacting server...");

if (Country == "scotland") return ("edinburgh");

else if (Country == "england") return ("london");

return "Not known";

public class Program

private static System.Threading.AutoResetEvent endServer =

new System.Threading.AutoResetEvent(false);

public static void Main()

new NetTcpBinding(), "net.tcp://localhost:8080");

svh.Open();

Console.WriteLine("Server running");

endServer.WaitOne();

Console.WriteLine("Server shutting down");

svh.Close();

Console.WriteLine("Server stopped");

using System.ServiceModel;

namespace Tut1.Contract

[ServiceContract]

[OperationContract]

string Contact(string message);

Buchanan

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Stateful firewall

Practical Example

Buchanan

uchanan

Windows Communications

Foundation

wwf/wcfbillatnapier.com/wwf_wfc_ppt.pdf · n s t a t e f u l f i r e w a l l n e t w o r k s e c u...

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