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  • Book Overview & Buying Mastering Apache Camel
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Mastering Apache Camel

Mastering Apache Camel

By : Jean-Baptiste Onofré
3.2 (6)
Buy this Book
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Mastering Apache Camel

Mastering Apache Camel

3.2 (6)
By: Jean-Baptiste Onofré
Buy this Book

Overview of this book

This book is intended for all Camel users who want to get the best out of Camel, and who want to implement the most efficient integration logic using best practices.
Table of Contents (10 chapters)
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Preface
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Preface
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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. Key Features
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1. Key Features
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What is Apache Camel?
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Components and bean support
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Predicates and expressions
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Data format and type conversion
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Easy configuration and URI
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Lightweight and different deployment topologies
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Quick prototyping and testing support
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Management and monitoring using JMX
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Active community
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Summary
2
2. Core Concepts
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2. Core Concepts
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Messages
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Exchange
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Camel context
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Processor
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Routes
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Channels
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Domain Specific Languages (DSL)
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Component, endpoint, producer, and consumer
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Data format
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Type converter
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Summary
3
3. Routing and Processors
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3. Routing and Processors
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What is a processor?
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An example of Camel routes containing processors
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Summary
4
4. Beans
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4. Beans
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Registry
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Creating CompositeRegistry
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Service activator
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Bean and method bindings
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Annotations
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Example – creating an OSGi bundle with a bean
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Building and deploying
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Summary
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5. Enterprise Integration Patterns
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5. Enterprise Integration Patterns
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EIP processors
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Messaging systems EIPs
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Messaging channels EIPs
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Message Construction EIPs
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Message Routing
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Message Transformation EIPs
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The Messaging Endpoints EIPs
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System Management EIPs
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Summary
6
6. Components and Endpoints
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6. Components and Endpoints
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Components
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Endpoint
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A custom component example
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Summary
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7. Error Handling
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7. Error Handling
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Types of errors
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Camel error handlers
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Error handlers scopes
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Error handler features
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Try, Catch, and Finally
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Summary
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8. Testing
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8. Testing
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Unit test approach with the Camel test kit
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A complete example
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Additional annotations
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Mocking OSGi services
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Summary
9
Index
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Index

Messages

Messages transport the data between the different parts of the mediation logic. Your mediation logic will define the flow of messages between different nodes.

A message flows in one direction, from a sender to a receiver. It's not possible to use the same message to answer the sender, we will have to use another message. A message is described in the org.apache.camel.Message interface.

The javadoc is available at http://camel.apache.org/maven/camel-2.13.0/camel-core/apidocs/org/apache/camel/Message.html.

A message contains the following:

  • ID: A message ID of type String. Camel creates an ID for you. This ID identifies the message and can be used for correlation or storage. For instance, we will see that the message ID is used in the idempotent consumer pattern to identify the message in a store.
  • Header: A set of headers, allowing you to store any kind of data associated with a message. The headers are stored as org.apache.camel.util.CaseInsensitiveMap by default. The CaseInsensitiveMap...
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Mastering Apache Camel
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