Spring Integration Essentials

Chandan Pandey

• Verlag: Packt Publishing
• Jahr: 2015
• ISBN:
  9781783989164
• Thema: Computer Science
• Thema: Web Programming

Spring Integration Essentials

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Table of Contents

Spring Integration Essentials

Credits

About the Author

Acknowledgments

About the Reviewers

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Preface

How enterprise integration challenges can be solved

Who are the players?

Why Spring Integration?

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Errata

Piracy

Questions

1. Getting Started

Setting up STS

Creating your first project

STS visual editor

Spring Integration Scala DSL

Summary

2. Message Ingestion

Working with message channels

Channel types

Spring implementation of channels

Selecting a channel

Publish-subscribe channel

Queue channel

Priority channel

Rendezvous channel

Direct channel

Executor channel

Scoped channel

Datatype channel

Error handling on channels

Persisting and recovering channels

Channel interceptors

Summary

3. Message Processing

Message endpoints

Gateways

Synchronous gateways

Asynchronous gateways

Service activators

Delayers

Transactions

Summary

4. Message Transformers

Introducing message transformers

Working with XML payload

The marshalling transformer

The unmarshalling transformer

XPath transformers

Validating XML messages

Beyond default transformers

Content enrichers

Header enrichers

Payload enrichers

Claim check

Incoming claim check transformer

Outgoing claim check transformer

Summary

5. Message Flow

Routers

Payload-type router

Header value router

Recipient list router

XPath router

Error message exception-type router

Default output channel

Using annotations

Filters

Using a Java class to act as a filter

Configuring a filter as a message endpoint

Splitters

Aggregators

Correlation strategy

Release strategy

Message store

Resequencers

Chaining handlers

Summary

6. Integration with External Systems

Working with files

Prerequisites

Reading files

Behind the scenes

Filters

Preventing duplicates

Concurrent access

Writing files

Naming the file

Target directory

Dealing with existing filenames

File transformers

FTP/FTPS

Prerequisites

Downloading files from the FTP server

Incomplete files

Uploading files to the FTP server

Avoiding partially written files

FTP outbound gateway

FTPS support

Social integration

Prerequisites

Receiving tweets

Sending tweets

Twitter search outbound gateway

Enterprise messaging

Prerequisites

Receiving messages – the inbound adapter

The polling adapter

The event-driven adapter

Sending messages – the outbound adapter

Gateway

The inbound gateway

The outbound gateway

HTTP

Prerequisites

The HTTP inbound gateway

The HTTP outbound gateway

Web services

Prerequisites

The inbound gateway

The outbound gateway

Database SQL

Prerequisites

Datasource

Reading from the database – the inbound adapter

Transaction support

Writing to the database – the outbound adapter

Inbound and outbound gateways

Stream processing

Prerequisites

Reading from a stream

Writing to a stream

Summary

7. Integration with Spring Batch

Spring Batch

Prerequisites

Defining a Spring Batch job

The Spring Batch job language

ItemReader

ItemWriter

Spring Batch and Spring Integration

Launching the job

Tracking the status of a batch job

The other way round

Summary

8. Testing Support

Prerequisite

Testing messages

Testing headers

Handling errors

Testing filters

Splitter test

Summary

9. Monitoring, Management, and Scaling Up

Monitoring and management

JMX support

Prerequisites

The notification listening channel adapter

The notification publishing channel adapter

The attribute polling channel adapter

The tree polling channel adapter

The operation invoking channel adapter

The operation invoking outbound gateway

The MBean exporter

Tracking the message

Wire tap

Control bus

Scaling up

Threading

Scaling the state

Message store

Claim check

Summary

10. An End-to-End Example

Prerequisites

Setting up

Ingesting data

Ingesting data from the RSS feed

Ingesting data from an FTP server

Filtering the data

The aggregator

The correlation bean

The completion bean

The aggregator bean

The splitter

Transformation

The DB transformer

The JMS transformer

The mail transformer

Router

Integration

Database integration

Prerequisites

The gateway

The service activator

Gateways for updating and reading the feeds

Sending a mail

Putting messages on to the JMS queue

Exporting as an MBean

Summary

Index

Spring Integration Essentials

Copyright © 2015 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.

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First published: February 2015

Production reference: 1160215

Published by Packt Publishing Ltd.

Livery Place

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Birmingham B3 2PB, UK.

ISBN 978-1-78398-916-4

www.packtpub.com

Credits

Author

Chandan Pandey

Reviewers

Marten Deinum

Biju Kunjummen

Xinyu Liu

Luca Masini

Commissioning Editor

Julian Ursell

Acquisition Editor

Richard Brookes-Bland

Content Development Editors

Sharvari Tawde

Ritika Singh

Technical Editor

Aman Preet Singh

Copy Editors

Roshni Banerjee

Pranjali Chury

Project Coordinator

Judie Jose

Proofreaders

Ameesha Green

Joanna McMahon

Indexer

Monica Ajmera Mehta

Production Coordinator

Nilesh R. Mohite

Cover Work

Nilesh R. Mohite

About the Author

Chandan Pandey is an Oracle Certified Enterprise architect with more than 10 years of experience in designing, coding, and delivering enterprise applications using various tools and technologies. He has always been amused by the power of software that reduces the boredom of repetitive tasks and introduces agility and efficiency. He firmly believes that tools, technology, and methodology are a medium to provide a solution and would like to be positioned as a solutions expert rather than limiting his identity to a framework or tool. This is reflected in the breadth and depth of his work; he is proficient not only in traditional languages and frameworks such as Java/JEE and Spring, but also in Groovy and Grails, Vaadin, and Play Framework, to name a few. His domain experi...