5. Producers, Consumers, Handlers, Listeners, and Synchronizers | Learning Karaf Cellar

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Learning Karaf Cellar

By : Jean Baptiste Onofre, Jean-Baptiste Onofré

5 (1)

Learning Karaf Cellar

5 (1)

By: Jean Baptiste Onofre, Jean-Baptiste Onofré

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.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Apache Karaf – Provisioning and Clusters

1. Apache Karaf – Provisioning and Clusters

What is OSGi?

The OSGi container

Multiple Apache Karaf containers

Summary

2. Apache Karaf Cellar

2. Apache Karaf Cellar

Cluster topologies

Apache Karaf Cellar architecture

Apache Karaf Cellar installation and first commands

Cluster resources

Summary

3. Hazelcast

3. Hazelcast

What is Hazelcast?

Distributed cluster resource states

Replicas/Backup

Networks

Summary

4. Cluster Groups

4. Cluster Groups

Managing cluster groups

Targeting provisioning

Summary

5. Producers, Consumers, Handlers, Listeners, and Synchronizers

5. Producers, Consumers, Handlers, Listeners, and Synchronizers

The event producer

The event consumer

Event handlers

Listeners and synchronizers

Summary

6. The Filtering of Cluster Events

6. The Filtering of Cluster Events

The configuration of the filters

Resources

Blacklist and whitelist

Inbound and outbound

Regex and event identification

The default filter configuration

Summary

7. DOSGi

7. DOSGi

What is Cellar DOSGi?

The API bundle

The service bundle

The client bundle

Summary

8. Cellar and Camel

8. Cellar and Camel

The communication between remote routes

Caching with a distributed map

Summary

9. Roadmap

9. Roadmap

HTTP load balancing and session clustering

Clustering a log service

Summary

Index

Index

Event handlers

When the consumer receives a cluster event's message, it delegates the message to a handler depending on the type of the cluster event.

You have one handler per type of resource that Cellar manages. The following is a list of the event handlers:

ConfigurationEventHandler: This is responsible for handling cluster events related to configurations (for instance, events that come from the cluster:config-* or config:* commands)
BundleEventHandler: This is responsible for handling cluster events related to bundles (for instance, events that come from the cluster:bundle-* or osgi:* commands)
FeaturesEventHandler: This is responsible for handling cluster events related to features (for instance, events that come from the cluster:feature-* or features:* commands)
ObrBundleEventHandler and ObrUrlEventHandler (optional): These are responsible for handling cluster events related to the OBR service (for instance, events that come from the cluster:obr-* or obr:* commands)
ClusterEventHandler...

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