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Camel in Action, Second Edition. Claus Ibsen and Jonathan Anstey Forewords by James Strachan and Dr. Mark Little. February ; ISBN Stamford, CT Cover designer: Marija Tudor. Typesetter: Gordan Salinovic. ISBN Printed in the United States of America. 1 2 3 4 5 6. Start learning about Camel in this ebook, which includes excerpts from the book Camel in Action by Claus Ibsen and Jonathan Anstey (Red Hat.
Do you need a proven integration framework to bring it all together seamlessly? Do you want to make integration easier and more accessible to developers? Isben and Anstey distill their extensive experience and practical insights to help you can tackle integration tasks with more success. This ebook explains: What Camel is and how to use it. Best practices for creating Apache Camel applications that perform useful tasks. How to build and deploy lightweight integration applications as microservices.
The book has been well received within the community, and it has helped a lot of people beginning to ride the Camel. Jonathan and I have done our best to keep the material in the book as up to date to the latest Camel release. In fact, during the type-setting period that takes four months we ensured that material was updated accordingly to new Apache Camel releases. So when the book went into production it was up to date with the Apache Camel 2.
Ever since the book was published, we have been active on the Author Online forum to catch the minor mistakes and feedback you may have. The errata of the book is fully up to date. In fact the errata was updated as recently as a couple of months ago. Likewise, the accompanying source code of the book has been kept up to date with the newer Camel releases.
And this time we have prepared the source code for the upcoming Camel 2. I myself, as a reader of other books, see this kind of service as rare. Simulating errors 9. Simulating errors using a processor. Simulating errors using mocks. Simulating errors using interceptors. Using adviceWith to add interceptors to an existing route. Using adviceWith to manipulate routes for testing. Using weave with advice with to amend routes. Camel integration testing 9.
Integration testing. Using third party testing libraries 9. Using Arquillian to test Camel applications. Using Pax-Exam to test Camel applications. Using Citrus Framework to test Camel applications. Restful services Using camel-reslet with REST services. Using camel-cxfrs with REST services.
A quick example of the Rest DSL. Supported components for the Rest DSL. API Documentation using Swagger Documenting Rest DSL services.
Documenting input, output and error codes. Configuring API documentation. Web services Configuring CXF. Using a contract-first approach. Error Handling Understanding error handling Error handlers in Camel The default error handler.
The dead letter channel error handler. The transaction error handler. Features of the error handlers. Using error handlers with redelivery An error-handling use case.
Using the DefaultErrorHandler with redelivery. Reusing context scoped error handlers. Using exception policies Understanding how onException catches exceptions. Understanding how onException works with redelivery. Understanding how onException can handle exceptions. New exception while handling exception. Implementing an error handler solution.
Other error-handling features Using onWhen. Transactions and Idempotency Why use transactions? The Rider Auto Parts partner integration application.
Setting up the JMS broker and the database. The story of the lost message. Transaction basics Using local transactions. Transaction starting from a database resource.
Using transactions with multiple routes. Using different transaction propagations. Returning a custom response when a transaction fails. Compensating for unsupported transactions Introducing UnitOfWork. Using Synchronization callbacks. Idempotency Idempotent Consumer EIP. Clustered idempotent repository. Parallel processing Introducing concurrency Running the example without concurrency. Using thread pools Understanding thread pools in Java.
Creating custom thread pools. Using ExecutorServiceStrategy. Parallel processing with EIPs Using concurrency with the Threads EIP.
Using concurrency with the Multicast EIP. The asynchronous routing engine Hitting the scalability limit. Components supporting asynchronous processing. Writing a custom asynchronous component.
Potential issues when using an asynchronous component.
Dangers with blocked threads. Securing Camel Securing your configuration Encrypting configuration.
Web service security Authentication in web services. Authenticating web services using JAAS. Payload security Digital signatures. Route authentication and authorization.
Running and deploying Camel Starting Camel How Camel starts. Starting and stopping routes at runtime Using CamelContext to start and stop routes at runtime.
Using RoutePolicy to start and stop routes at runtime. Shutting down Camel Graceful shutdown. Deploying Camel Embedded in a Java application. Embedded in a web application. Camel and OSGi Setting up Maven to generate an OSGi bundle. Installing and running Apache Karaf. Using a Blueprint-based Camel route.
Using a managed service factory to spin up route instances. Camel and CDI WildFly deployment. Management and Monitoring Monitoring Camel Checking health at the network level. Checking health level at the JVM level. Checking health at the application level. Using JMX with Camel Using JConsole to manage Camel. Using JConsole to remotely manage Camel.
Using Jolokia to manage Camel. Tracking application activity Using log files. Managing Camel applications Managing Camel application lifecycles. Using Jolokia and hawtio to manage Camel lifecycles. Using Camel commands to manage Camel.
Using controlbus to manage Camel. The Camel management API Management enable custom Camel components. Management enable custom Java beans. Clustering Clustered HTTP. Clustered Camel routes Clustered JMS Clustered Kafka Kafka consumer offset. Crashing a JVM with a running Kafka consumer. Clustering caches Clustered cache using Hazelcast. Clustering cache using JCache and Infinispan.
Using clustered scheduling Clustered scheduling using Quartz. Microservices with Docker and Kubernetes Getting started with Camel on Docker Building and running Camel microservices locally. Building and running Camel microservices using Docker. Run Java Microservices on Docker. Getting Started with Kubernetes Installing Minikube. Running Camel and other applications in Kubernetes Run applications using kubctl. Calling a service running inside Kubernetes cluster. Run Java applications in Kubernetes using Maven tooling.
Java microservices calling each other in the cluster. Debugging Java applications in Kubernetes. Understanding Kubernetes Introducing Kubernetes. Essential Kubernetes Concepts. Building resilient Camel microservices on Kubernetes Scaling up microservices.
Using readiness and liveness probes. Dealing with failures calling services in Kubernetes. About fabric8. Camel tooling Camel Editors JBoss Tools for Apache Camel.
Camel Validation using Maven. Camel Catalog - The information goldmine Developing custom tooling using the camel-catalog.
Overview of hawtio functionality. Debugging Camel routes using hawtio. Reactive Camel Using Reactive Streams with Camel Reactive flow control with back pressure. First steps with Reactive Streams. Using Camel with Reactive Streams.
Controlling back pressure from producer side. Controlling back pressure from consumer side. Building a dong simulator using Vert. Summary of using Camel with Vert. Camel and IoT The Internet Of Things shopping list Raspberry Pi. The Internet Of Things architecture. Gateway to a data center connectivity Camel and Eclipse Kura Starting Kura in emulator mode. Defining Camel routes using Kura web UI. Next steps with Camel and Kura. Next steps with Camel and Internet Of Things Eclipse Kapua.
Appendix A: Simple, the expression language A. Introducing Simple. Built-in operators A. Combining expressions. Using Simple from custom Java code. Appendix B: The Camel community B. Apache Camel website. About the Technology Apache Camel is a Java framework that implements enterprise integration patterns EIPs and comes with over adapters to third-party systems. About the reader Readers should be familiar with Java.