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Spring Integration Essentials

Spring Integration Essentials

By : CHANDAN K PANDEY
2.7 (3)
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Spring Integration Essentials

Spring Integration Essentials

2.7 (3)
By: CHANDAN K PANDEY
Buy this Book

Overview of this book

This book is intended for developers who are either already involved with enterprise integration or planning to venture into the domain. Basic knowledge of Java and Spring is expected. For newer users, this book can be used to understand an integration scenario, what the challenges are, and how Spring Integration can be used to solve it. Prior experience of Spring Integration is not expected as this book will walk you through all the code examples.
Table of Contents (12 chapters)
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Preface
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Preface
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How enterprise integration challenges can be solved
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Who are the players?
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Why Spring Integration?
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Getting Started
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1. Getting Started
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Setting up STS
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Creating your first project
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STS visual editor
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Spring Integration Scala DSL
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Summary
2
2. Message Ingestion
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2. Message Ingestion
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Working with message channels
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Channel types
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Spring implementation of channels
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Selecting a channel
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Error handling on channels
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Persisting and recovering channels
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Channel interceptors
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Summary
3
3. Message Processing
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3. Message Processing
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Message endpoints
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Gateways
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Service activators
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Delayers
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Transactions
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Summary
4
4. Message Transformers
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4. Message Transformers
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Introducing message transformers
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Working with XML payload
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Validating XML messages
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Beyond default transformers
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Content enrichers
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Claim check
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Summary
5
5. Message Flow
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5. Message Flow
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Routers
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Using annotations
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Filters
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Splitters
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Aggregators
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Resequencers
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Chaining handlers
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Summary
6
6. Integration with External Systems
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6. Integration with External Systems
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Working with files
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FTP/FTPS
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Social integration
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Enterprise messaging
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HTTP
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Web services
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Database SQL
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Stream processing
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Summary
7
7. Integration with Spring Batch
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7. Integration with Spring Batch
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Spring Batch
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Defining a Spring Batch job
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Spring Batch and Spring Integration
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Summary
8
8. Testing Support
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8. Testing Support
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Prerequisite
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Testing messages
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Testing headers
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Handling errors
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Testing filters
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Splitter test
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Summary
9
9. Monitoring, Management, and Scaling Up
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9. Monitoring, Management, and Scaling Up
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Monitoring and management
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Scaling up
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Summary
10
10. An End-to-End Example
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10. An End-to-End Example
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Prerequisites
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Ingesting data
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The aggregator
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The splitter
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Transformation
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Router
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Integration
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Exporting as an MBean
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Summary
11
Index
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Index

Persisting and recovering channels

We talked about all kind of channels, but if you have noticed, these are all in memory. What if the system crashes? No one wants to lose data. This is where persistent QueueChannel comes into the picture—messages will be backed up in the database defined by the data source. If the system crashes, then on recovery, it will pull all the messages in the database and queue them for processing. This is achieved in Spring using MessageGroupStore. Let's have a quick look at the configuration:

<int:channel id="resultPersistenceChannel">
  <int:queue message-store="messageStore"/>
</int:channel>

<int-jdbc:message-store id="messageStore" data-source="someDataSource"/>

Here, the message store is mapped to the database defined by someDataSource. When a message arrives, it will now be added to MessageStore first. On successful processing, it will be removed from there.

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Spring Integration Essentials
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