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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

Filters

Message filters are Spring Integration components, which act as an interceptor and decide whether to pass on the message to the next channel/component or drop it. Unlike routers, which decide what should be the next channel for a message, filters only take a boolean decision—whether to pass or not. There are two ways to define a message filter in Spring Integration:

  • Write a simple Java class and designate its method that will take decisions whether to pass the message or not

  • Configure it as a message endpoint that delegates to an implementation of the MessageSelector interface

This can be configured either in XML or annotations can be used.

Using a Java class to act as a filter

Let's take an example of using a simple Java class as a filter—this is part of our example about feeds. As feeds come in, we try to validate whether the payload is empty or not—then only pass it on for further processing:

<int:filter 
  input-channel="fetchedFeedChannel" 
  output-channel="filteredFeedChannel...
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Spring Integration Essentials
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