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Home > Programming > Middleware > Mastering Apache Camel
Mastering Apache Camel
Mastering Apache Camel

Mastering Apache Camel: An advanced guide to Enterprise Integration using Apache Camel

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Mastering Apache Camel

Chapter 2. Core Concepts

This chapter introduces the core concepts of Camel. These concepts are the key basis of all functionalities provided by Camel. We will use them in the next chapters. As we have seen in the previous chapter, Camel is an integration framework. This means that it provides everything to implement your mediation logic: messaging, routing, transformation, and connectivity.

We will look at the following concepts:

  • Messages
  • Exchanges
  • Camel contexts

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...

Exchange

Camel doesn't transport a message directly. The main reason is that a message flows only in one direction. When dealing with messaging, there are many Message Exchange Patterns (MEP) that we can use.

Depending on the use cases, we can send a message without expecting any return from the destination: this pattern is named event message and uses InOnlyMEP. For instance, when you read a file from the filesystem, you just process the file content, without returning anything to the endpoint that read the file. In that case, the component responsible for reading the filesystem will define an InOnlyMEP.

On the other hand, you may want to implement a request reply pattern: a response message should be returned to the sender of the request message, and so it uses an InOutMEP. For instance, you receive a SOAP Request from a WebService component, so you should return a SOAP Response (or SOAP Fault) to the message sender.

In Camel, MEP are described in the org.apache.camel.ExchangePattern...

Camel context

The Camel context is the runtime system and the loading container of all resources required for the execution of the routing. It keeps everything together to allow the user to execute the routing logic. When the context starts, it also starts various components and endpoints, and activates the routing rules.

The Camel context is described by the org.apache.camel.CamelContext interface (http://camel.apache.org/maven/current/camel-core/apidocs/org/apache/camel/CamelContext.html).

Camel context

A Camel context contains the following:

  • The components and endpoints used in the routing (see later for the details about components and endpoints)
  • The type converters used to transform a message of one type to another
  • The data formats used to define the format of a message body
  • The registry where Camel will look for the beans used in the routing
  • The languages describing expressions and predicates used in the routing by a language (xpath, xquery, PHP, and so on)
  • The routes definition itself allowing you to...

Processor

A processor is a node in the routing which is able to use, create, or modify an incoming exchange. During routing, the exchanges flow from one processor to another. This means all Enterprise Integration Patterns (EIP) are implemented using processors in Camel. The exchanges get in and out of a processor by using components and endpoints, as we will see later in this chapter.

A processor is described using the org.apache.camel.Processor interface. To create your own processor, you just have to implement the Processor interface and override the process() method:

Tip

Downloading the example code

You can download the example code files from your account at http://www.packtpub.com for all the Packt Publishing books you have purchased. If you purchased this book elsewhere, you can visit http://www.packtpub.com/support and register to have the files e-mailed directly to you.

public class MyProcessor implements Processor {

  public void process(Exchange exchange) {
System.out.println(&quot...

Routes

The Camel route is the routing definition. It's a graph of processors. The routes (routing definition) are loaded in the Camel context. The execution and flow of the exchange in a route is performed by the routing engine. The routes are used to decouple clients from servers, and producers from consumers: an exchange consumer doesn't know where the exchange comes from, and on the other hand an exchange producer doesn't know the destination of the exchange. Thanks to that, it provides a flexible way to add extra processing or change the routing with limited impact on the logic.

Each route has a unique identifier that you can specify (or Camel will create one for you). This identifier is used to easily find the route, especially when you want to log, debug, monitor, or manage a route (start or stop).

A route has exactly one input source (the input endpoint). A route has a life cycle similar to the Camel context with the same states: started, stopped, and suspended. To Camel...

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...

Exchange

Camel doesn't transport a message directly. The main reason is that a message flows only in one direction. When dealing with messaging, there are many Message Exchange Patterns (MEP) that we can use.

Depending on the use cases, we can send a message without expecting any return from the destination: this pattern is named event message and uses InOnlyMEP. For instance, when you read a file from the filesystem, you just process the file content, without returning anything to the endpoint that read the file. In that case, the component responsible for reading the filesystem will define an InOnlyMEP.

On the other hand, you may want to implement a request reply pattern: a response message should be returned to the sender of the request message, and so it uses an InOutMEP. For instance, you receive a SOAP Request from a WebService component, so you should return a SOAP Response (or SOAP Fault) to the message sender.

In Camel, MEP are described in the org.apache.camel.ExchangePattern enumeration...

Camel context

The Camel context is the runtime system and the loading container of all resources required for the execution of the routing. It keeps everything together to allow the user to execute the routing logic. When the context starts, it also starts various components and endpoints, and activates the routing rules.

The Camel context is described by the org.apache.camel.CamelContext interface (http://camel.apache.org/maven/current/camel-core/apidocs/org/apache/camel/CamelContext.html).

A Camel context contains the following:

  • The components and endpoints used in the routing (see later for the details about components and endpoints)

  • The type converters used to transform a message of one type to another

  • The data formats used to define the format of a message body

  • The registry where Camel will look for the beans used in the routing

  • The languages describing expressions and predicates used in the routing by a language (xpath, xquery, PHP, and so on)

  • The routes definition itself allowing you to design...

Processor

A processor is a node in the routing which is able to use, create, or modify an incoming exchange. During routing, the exchanges flow from one processor to another. This means all Enterprise Integration Patterns (EIP) are implemented using processors in Camel. The exchanges get in and out of a processor by using components and endpoints, as we will see later in this chapter.

A processor is described using the org.apache.camel.Processor interface. To create your own processor, you just have to implement the Processor interface and override the process() method:

Tip

Downloading the example code

You can download the example code files from your account at http://www.packtpub.com for all the Packt Publishing books you have purchased. If you purchased this book elsewhere, you can visit http://www.packtpub.com/support and register to have the files e-mailed directly to you.

public class MyProcessor implements Processor {

  public void process(Exchange exchange) {
System.out.println("Hello...

Routes

The Camel route is the routing definition. It's a graph of processors. The routes (routing definition) are loaded in the Camel context. The execution and flow of the exchange in a route is performed by the routing engine. The routes are used to decouple clients from servers, and producers from consumers: an exchange consumer doesn't know where the exchange comes from, and on the other hand an exchange producer doesn't know the destination of the exchange. Thanks to that, it provides a flexible way to add extra processing or change the routing with limited impact on the logic.

Each route has a unique identifier that you can specify (or Camel will create one for you). This identifier is used to easily find the route, especially when you want to log, debug, monitor, or manage a route (start or stop).

A route has exactly one input source (the input endpoint). A route has a life cycle similar to the Camel context with the same states: started, stopped, and suspended. To Camel, a context...

Channels

In every Camel route, there is a channel that sits between each processor in the route graph. It's responsible for the routing of an Exchange to the next Processor in the graph. The channel acts as a controller that monitors and controls the routing at runtime. It allows Camel to enrich the route with interceptors. For instance, the Camel tracer or the error handling are functionalities implemented using an interceptor on the channel.

The channel is described by the org.apache.camel.Channel interface. You can configure your own interceptor on the channels by describing it in Camel context.

Camel supports three kinds of interceptors on the channels:

  • Global interceptors: This intercepts all exchanges on the channels

  • Interceptors on the incoming exchanges: This has limited the scope of the interceptor only on the first channel (the one just after the first endpoint)

  • Interceptors on the exchanges going to one specific endpoint: This limits the interceptor to the channel just before a given...

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Description

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.

Who is this book for?

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.

What you will learn

  • Walk through the key features and core concepts of Apache Camel
  • Implement routing with Processor, using Camel Java DSL and Camel Blueprint DSL
  • Use beans with Camel to access to the POJO model, and leverage IoC frameworks like Spring or Blueprint
  • Get to grips with the EIPs supported by Camel and implement them in your projects
  • Create polling and eventdriven components, and learn how Camel uses components to create endpoints
  • Identify and deal with errors in your routing logic
  • Conduct unit tests and integration tests on your Camel routes
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Table of Contents

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

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Mitchell Trachtenberg Jan 21, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
An invaluable introduction to Apache Camel. I would hope it can be updated with all the developments since the second edition, since the evolution of Camel's ecosystem has been rapid.
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NJ Aug 21, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is really a great book for anyone who wants to learn Camel and use in their project. Book thoroughly explains all the enterprise integration patterns and how that's implemented in Camel. The book is very well written and explains the complex topics easily. Good for anyone who is learning Camel for first time or want to update his knowledge.
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"H Gasmi" Aug 06, 2020
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This book is very good as an introduction to the framework before exploring it in detail. The topics are nicely and clearly covered with detailed and complete examples.
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S. Bryant Sep 08, 2015
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
A nice mix of hands-on get-going quickly instruction with added discussion on why and how Camel works. You can pick and chose how in depth you want to be and/or revisit sections later for more in-depth reading. I am finding it very useful for second and third project - refreshing my memory by re-reading specific chapters that apply to my current problem space.
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Alsq Sep 23, 2015
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If you care for stream-of-consciousness grade school printed English, pages of (repetitive) listing of pom.xml files, and irritating print with little regard for proper form, use of pronouns or articles, or even trivial editing (e.g. PrefixerProcessor and PrefixerProcesser [sic] appear two lines away from each other [p. 24]), this is your book. The text could be a stenographical transcription of a recorded live classroom session, enriched with pro-forma screen captures of maven build output. A promise of concise explanation implied in the advertised restrained page count is completely squandered with content poorly organized and inadequate to the task of providing a coherent, well-explained introduction organized according to a readily recognizable path. The table of content suggests it might have been (I fell for it), but the implementation is truly disappointing. If you are already fluent in Camel, but dated, this could maybe fill in as a short partial read on the latest about this project, and how to integrate it with the Apache Karaf OSGi container. But then, you would not need an introductory tutorial like this book appear to me it claims to be. Alas, I will have to backtrack and look elsewhere. Caveat emptor, as the book is not that cheap either.
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About the authors

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Profile icon Jean-Baptiste Onofré
Jean-Baptiste Onofré
Jean-Baptiste Onofré is a member of the Apache Software Foundation, and he has been involved in Apache projects for about 10 years. He's the PMC chair of Apache Karaf and its subprojects, including Cellar, Cave, and EIK. He's also a PMC member of Apache ACE, Apache ServiceMix, and Apache Syncope, and he is a committer for Apache ActiveMQ, Apache Archiva, Apache Aries, Apache Camel, and Apache jClouds. He's currently working at Talend (http://www.talend.com) as a software architect and is a member of the Talend Apache team. He has provided articles on Java technologies for GNU/Linux magazine France and has worked as an author and a reviewer on different books, such as Learning Karaf Cellar and Apache Karaf Cookbook, both by Packt Publishing. He has also given talks on Apache projects, such as Karaf and Camel, at different conferences, especially ApacheCon NA and Europe, CamelOne, and so on.
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Profile icon Bilgin Ismet Ibryam
Bilgin Ismet Ibryam
Bilgin Ibryam is a software engineer with Master's degree in Computer Science and currently working for BBC in London. He is interested in a variety of technologies including application integration, message-oriented middleware, service-oriented architecture, and ERP systems. He is also an open source enthusiast, Apache OFBiz, and Apache Camel committer. In his spare time, he enjoys contributing to open source projects and blogging at www.ofbizian.com. Bilgin can be contacted via Twitter at https://twitter.com/bibryam.
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FAQs

What is the delivery time and cost of print book? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela