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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
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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
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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
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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
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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
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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
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Index
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Index

The event consumer

As explained before, a producer sends a cluster event message in a queue.

On the other hand, each node embeds a consumer. A consumer binds a set of handlers.

The consumer is responsible to get the cluster event messages from the different queues, and depending on the type of the cluster event, the consumer delegates the cluster event to a handler. This means that you have a handler for every type of resource.

For a consumer, we can perform the following tasks:

  • Check the current status of the consumer (on each node) using the cluster:consumer-status command, as follows:
    karaf@root> cluster:consumer-status
   Node                       Status
  [node2:5702           ] [ON   ]
* [node1:5701           ] [ON   ]

    The cluster:consumer-status command accepts a node ID as the argument, as follows:

    karaf@root>  cluster:consumer-status node2:5702
   Node                       Status
  [node2:5702           ] [ON   ]
  • Stop the consumer of any node using the cluster:consumer-stop command...
CONTINUE READING
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Learning Karaf Cellar
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