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  • Book Overview & Buying Learning Karaf Cellar
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Learning Karaf Cellar

Learning Karaf Cellar

By : Jean Baptiste Onofre, Jean-Baptiste Onofré
5 (1)
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Learning Karaf Cellar

Learning Karaf Cellar

5 (1)
By: Jean Baptiste Onofre, Jean-Baptiste Onofré
Buy this Book

Overview of this book

This book is a tutorial written with a step-by-step approach to help you implement an optimum clustering solution in Apache Karaf Cellar quickly and efficiently. If you are new to Karaf and want to install and manage multiple Karaf instances by farming or clustering, then this book is for you. If you are a Java developer or a system administrator with basic knowledge of Karaf, you can use this book as a guide. Some background knowledge of OSGi and/or Karaf would be preferred but is not mandatory.
Table of Contents (11 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. Apache Karaf – Provisioning and Clusters
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1. Apache Karaf – Provisioning and Clusters
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What is OSGi?
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The OSGi container
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Multiple Apache Karaf containers
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Summary
2
2. Apache Karaf Cellar
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2. Apache Karaf Cellar
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Cluster topologies
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Apache Karaf Cellar architecture
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Apache Karaf Cellar installation and first commands
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Cluster resources
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Summary
3
3. Hazelcast
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3. Hazelcast
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What is Hazelcast?
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Distributed cluster resource states
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Replicas/Backup
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Networks
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Summary
4
4. Cluster Groups
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4. Cluster Groups
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Managing cluster groups
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Targeting provisioning
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Summary
5
5. Producers, Consumers, Handlers, Listeners, and Synchronizers
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5. Producers, Consumers, Handlers, Listeners, and Synchronizers
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The event producer
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The event consumer
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Event handlers
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Listeners and synchronizers
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Summary
6
6. The Filtering of Cluster Events
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6. The Filtering of Cluster Events
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The configuration of the filters
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Resources
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Blacklist and whitelist
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Inbound and outbound
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Regex and event identification
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The default filter configuration
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Summary
7
7. DOSGi
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7. DOSGi
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What is Cellar DOSGi?
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The API bundle
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The service bundle
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The client bundle
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Summary
8
8. Cellar and Camel
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8. Cellar and Camel
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The communication between remote routes
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Caching with a distributed map
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Summary
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9. Roadmap
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9. Roadmap
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HTTP load balancing and session clustering
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Clustering a log service
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Summary
10
Index
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Index

The API bundle

In OSGi, a service is described with an interface. This means that both service and client bundles of the same service have to share the same interface.

In order to decouple interface and implementation and be able to update a client bundle without impacting a service bundle, a good practice is to create an API bundle that contains just the interface.

We create this API bundle by just exposing the API package in the OSGi export package header as follows:

<osgi.export>
 org.apache.karaf.cellar.samples.dosgi.greeter.api*;version="${project.version}"
</osgi.export>

The API bundle contains the interface that describes the Greeter service as follows:

package org.apache.karaf.cellar.samples.dosgi.greeter.api;

/**
 * Interface describing the Greeter service.
 */
public interface Greeter {

  /**
   * Returns a greet message.
   * @return
   */
  public GreetResponse greet(Greet greet);

}

The service provides an operation: greet corresponding to the greet() method of the Greeter...

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Learning Karaf Cellar
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