Developing and Deploying Business Components using PowerJ.

Developing and Deploying BusinessDeveloping and Deploying BusinessComponents using PowerJComponents using PowerJ

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Developing and Deploying BusinessDeveloping and Deploying Businesscomponents using PowerJcomponents using PowerJ

Powerpoint presentation: http://www.sybase.com/products/eastudio/seminar

_info.html

under “Presentations” see “Phase II” and download:

EAServer 3.0 Overview and Building Components in PowerJ 3.0 (zip file)

Greg Burns - Technical Evangelist

Sybase Internet Applications Division

[email protected]

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Build the Future - SyberSeminar SeriesBuild the Future - SyberSeminar Series

1. Building a shopping cart application with the Web DataWindow

2. Developing Business Components with PB

3. Developing Business Components in Java with PowerJ

4. Load Balancing Failover and High Availability

5. Implementing Web Security

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eMusic Application PrevieweMusic Application Preview

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Jaguar CTS

JDBCODBCNative

E-BusinessE-BusinessSybase SolutionSybase Solution

HTML

COM

PowerBuilderCORBA

Java PowerDynamo

HTTPS

IIOPIIOP

Enterprise Application Server

CGIISAPINSAPI

DataWindow

DataWindow

DataWindow

Datastore

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Why use Java on the Server for businessWhy use Java on the Server for businesslogic components?logic components?

Multi-platform source code for business logic Java is a productive language for software development Commitment to developing in Java on all tiers On the server high-powered hardware and non-visual

programs combine to minimize any performance limitations of Java programs

Many corporations see Java programming as a way to attract and keep talented employees

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To efficiently manage

Role of the Application ServerRole of the Application Server

Component instantiation and lifecycle

Server

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Database connections



Transactions

Server

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Transactions Threads

Server

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Transactions Threads Security Server

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Creating a Java EA ServerCreating a Java EA ServerComponent with PowerJComponent with PowerJ

Steps

1. Create a Jaguar Server Bean Java class2. Code the Bean using Drag and Drop techniques3. Deploy the component to Jaguar CTS

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Jaguar Component WizardJaguar Component WizardHighlightsHighlights

Set the TargetTarget , JarJar ,PackagePackage and Bean NameBean Name

Specify any InterfacesInterfaces to implement

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Jaguar Deployment WizardJaguar Deployment WizardHighlightsHighlights

Specify Jaguar CTS packagepackage and componentcomponent names Specify the deployment classesdeployment classes

Define component life cyclelife cycle characteristics Define component transaction supporttransaction support characteristics

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Component Life Cycle CharacteristicsComponent Life Cycle Characteristics

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Instance PoolingInstance Pooling

Allows a single component instance to service multiple clients

Benefits Greatest scalability Many clients share limited

number of instances

Instance Pool

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Supporting Instance Pooling Supporting Instance Pooling EJB Server Bean MethodsEJB Server Bean Methods

Activate Triggered when component is bound to client Used to (re)initialize instance-specific data

Deactivate Triggered when component is unbound from client Used for clean-up code

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Instance PoolingInstance Pooling

Goal Minimize amount of time an instance remains bound

to a client (early deactivation) Design strategies

Stateful components Stateless components

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Stateful ComponentsStateful Components

Maintain a state between method invocations Store properties as instance variables Expose methods to manipulate properties

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setAmount(15000)

Instance Pool

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setAmount(15000)setMonths(24)

calculate( )

return 725

Instance Pool

15000

24

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Instance Pool

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Disadvantages of Stateful ComponentsDisadvantages of Stateful Componentsin Large-Scale Systemsin Large-Scale Systems

Lifetime Components have longer life (require resources)

Ownership Cannot be shared More instances must be created

Performance Larger number of RPCs across the network

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Stateless ComponentsStateless Components

Stateless components cannot use instance-specific data to accumulate data between method invocations Do not retain information from one method

invocation to the next Client passes needed information as parameters

to the method

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calculate(15000,24)

Instance Pool

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calculate(15000,24)

return 725

Instance Pool

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Instance Pool

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Advantages of Stateless ComponentsAdvantages of Stateless Componentsin Large-Scale Systemsin Large-Scale Systems

Lifetime Shorter life optimizes resource usage

Ownership Can be recycled Number of instances to create is minimized

Performance Improved due to fewer RPCs across the network

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Defining a Stateless ComponentDefining a Stateless ComponentAutomaticallyAutomatically

Deployment-time attribute Instance automatically deactivated on method return

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Defining a Stateless ComponentDefining a Stateless ComponentProgrammaticallyProgrammatically

InstanceContext functions completeWork( ) rollbackWork( )

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Define Component Transaction SupportDefine Component Transaction Support

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Define Component Transaction SupportDefine Component Transaction Support

Multiple components can participate in a single transaction

Each component performs part of the overall task

Jaguar transaction management lets you group database updates performed by multiple components into a single atomic unit of work

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Account 1Account 1

ExampleExample

TellerTeller

Account 2Account 2

Transfer

1. Withdraw

2. Deposit

LogLog3. Write

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What is the Scope of the Transaction?What is the Scope of the Transaction?Option 1Option 1

Withdraw Deposit Write to log

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What is the Scope of the Transaction?What is the Scope of the Transaction?Option 2Option 2

Transaction 1 Withdraw Deposit

Transaction 2 Write to log

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Account 1Account 1

Option 1Option 1

TellerTeller

Account 2Account 2

Transfer

1. Withdraw

2. Deposit

LogLog3. Write

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Account 1Account 1

Option 2Option 2

TellerTeller

Account 2Account 2

Transfer

1. Withdraw

2. Deposit

LogLog3. Write

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Starting to create an EAServer componentStarting to create an EAServer component in PowerJ in PowerJ

Bean Wizard Jaguar server component

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Jaguar Component WizardJaguar Component WizardOutcomeOutcome

Java Classes eMusicJ.CartJ.java eMusicJ.CartJInterface.java ServerBean interface implementation code Form for design time coding of Non Visual objects

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Step 2: Coding the ComponentStep 2: Coding the Component

activate() deactivate() retrieve( ) update( )

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ActivateActivate

transaction_1.connect();

state = parm0;

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Connection CachingConnection Caching

Components share pools of preallocated connections to remote database servers

Connection Cache

Connection Cache

IIOP

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DeactivateDeactivate

transaction_1.disconnect();

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Retrieve( )Retrieve( )

byte [ ][ ] state = new byte [1][ ];

ds_1.retrieve();

ds_1.getFullState(state);

return state[0];

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Update( byte[ ] state )Update( byte[ ] state )

ds_1.setFullState( state );

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Step 3: Deploy the ComponentStep 3: Deploy the Component

Configure PowerJ deployment options EAServer deployment wizard

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HTML

Creating a Client Application Creating a Client Application

COM

PowerBuilderCORBA

Java

Enterprise Application Server

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Creating a PowerJ Client ApplicationCreating a PowerJ Client Application

Step 1: Create a new Application using the new Target Wizard

Step 2: Create PowerJ Proxies

Step 3: Drag and Drop InitialContext component and proxy then code the Application

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Step 1: Target WizardStep 1: Target Wizard

Creates new Client main form

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Step 2: Create PowerJ ProxiesStep 2: Create PowerJ Proxies

Proxies for any kind of component can be created PowerBuilder Java COM C/C++

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Step 3: Add InitialContext component and Step 3: Add InitialContext component and proxy then code the applicationproxy then code the application

1. Initialize Connection and Proxies

2. Invoke Server Component's Methods

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1. Initialize Connection and Proxies1. Initialize Connection and Proxies

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2. Invoke Server Component's Methods2. Invoke Server Component's Methods

Retrieving data

byte [ ] state;

state = cartj_1.retrieve( );

dw_customer.setFullState(state)

Updating data

dw_customer.getFullState(state)

cartj_1.update(state)

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SummarySummary

Developing and Deploying Business Components using PowerJ.

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