OSGi and Messaging Building large applications that don't break down Iwein Fuld - SpringSource Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

Topics in this session How things break Code supernova Single threaded breakdown Synchronous breakdown How to fix Modularity Multi threading Messaging Sounds good, let's do it Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

How things break

Code supernova

Single threaded breakdown

Synchronous breakdown

How to fix

Modularity

Multi threading

Messaging

Sounds good, let's do it

What is performance? Performance Response time (Classic performance) Throughput (Concurrent processing) Utilization (Map – Reduce) Scalability Related to second two types of performance Reliability Reduced by scalability improvements Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

Performance

Response time (Classic performance)

Throughput (Concurrent processing)

Utilization (Map – Reduce)

Scalability

Related to second two types of performance

Reliability

Reduced by scalability improvements

Code supernova Assuming nothing is perfect Code bases shall grow Therefore teams shall grow Therefore code bases shall grow faster Until they are infinite UNLESS: they collapse into a black hole someone pulls the plug we modularize and evolve Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

Assuming nothing is perfect

Code bases shall grow

Therefore teams shall grow

Therefore code bases shall grow faster

Until they are infinite UNLESS:

they collapse into a black hole

someone pulls the plug

we modularize and evolve

The single thread breakdown One thread can only occupy a single core In ten years systems with less than 10 cores will be rare Web servers work with thread pools BUT What if a single request takes a lot of effort? Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

One thread can only occupy a single core

In ten years systems with less than 10 cores will be rare

Web servers work with thread pools

What if a single request takes a lot of effort?

The synchronous breakdown A customer orders a coffee and waits The waiter walks to the barista and passes the order and waits The barista walks to the coffee machine and waits Is this efficient? Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

A customer orders a coffee

and waits

The waiter walks to the barista and passes the order

and waits

The barista walks to the coffee machine

and waits

Is this efficient?

Topics in this session How things break Code supernova Single threaded breakdown Synchronous breakdown How to fix Modularity Multi threading Messaging Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

How things break

Code supernova

Single threaded breakdown

Synchronous breakdown

How to fix

Modularity

Multi threading

Messaging

OSGi Fix Supernova problem by adding modularity without adding extra latency Distribute development, colocate at runtime. Some other really nice things that I don't need to tell you about Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

Fix Supernova problem by adding modularity without adding extra latency

Distribute development, colocate at runtime.

Some other really nice things that I don't need to tell you about

The other problems Synchronous breakdown and single thread breakdown share common solution Messaging enables: Asynchronous handoff Concurrent processing Map reduce Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

Synchronous breakdown and single thread breakdown share common solution

Messaging enables:

Asynchronous handoff

Concurrent processing

Map reduce

What is Messaging? Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. How can multiple agents work together?... ...without being in each others way. Waiter helps customer and cook to collaborate.

Characteristics of Messaging Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. Transport The waiter takes an order and moves it to the barista Asynchronous Different actors can do different things in parallel Translation menu item => number => recipe Routing Orders arrive back at the proper table

Spring Integration Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

Pipes and Filters Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. Sender Application Receiver Application Channel MessageEndpoint

Hello world Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. <service-activator input-channel = &quot;inputChannel&quot; default-output-channel = &quot;outputChannel&quot; ref = &quot;helloService&quot; method = &quot;sayHello&quot; /> < beans:bean id = &quot;helloService&quot; class = &quot;...HelloService&quot; /> public class HelloService { public String sayHello(String name) { return &quot;Hello &quot; + name; } }

Channels Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. < channel id = &quot;incoming&quot; /> < channel id = &quot;orderedNotifications&quot; > <queue capacity = &quot;10&quot;/ > </channel>

What’s different about Spring Integration? Can be used from within an existing application. Lightweight (like any Spring application): run from JUnit test run within webapp Focussed on messaging and integration Not an ESB Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

Can be used from within an existing application.

Lightweight (like any Spring application):

run from JUnit test

run within webapp

Focussed on messaging and integration

Not an ESB

Others in general Full blown ESB It’s an application, not a framework You need to install it You need to run it Typically a lot heavier Focus on the deployment architecture not the actual integration. Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

Full blown ESB

It’s an application, not a framework

You need to install it

You need to run it

Typically a lot heavier

Focus on the deployment architecture not the actual integration.

Basic Integration Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

With a bus Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

Demo Time Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

Summary With OSGi + Messaging you fix Code supernova Synchronous and single thread breakdown Spring Integration lightweight decentralized (if you want) Good to know: Hohpe and Woolf + Goetz STS, dm Server Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

With OSGi + Messaging you fix

Code supernova

Synchronous and single thread breakdown

Spring Integration

lightweight

decentralized (if you want)

Good to know:

Hohpe and Woolf + Goetz

STS, dm Server

Questions and Plugs Ask now... or visit our booth... or google “Iwein Fuld” Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.