Book Image

Oracle Coherence 3.5

By : Aleksandar Seovic
Book Image

Oracle Coherence 3.5

By: Aleksandar Seovic

Overview of this book

Scalability, performance, and reliability have to be designed into an application from the very beginning, as there may be substantial cost or implementation consequences if they need to be added down the line. This indispensible book will teach you how to achieve these things using Oracle Coherence, a leading data grid product on the market.Authored by leading Oracle Coherence authorities, this essential book will teach you how to use Oracle Coherence to build high-performance applications that scale to hundreds of machines and have no single points of failure. You will learn when and how to use Coherence features such as distributed caching, parallel processing, and real-time events within your application, and understand how Coherence fits into the overall application architecture. Oracle Coherence provides a solid architectural foundation for scalable, high-performance and highly available enterprise applications, through features such as distributed caching, parallel processing, distributed queries and aggregations, real-time events, and the elimination of single points of failure.However, in order to take full advantage of these features, you need to design your application for Coherence from the beginning. Based on the authors' extensive knowledge of Oracle Coherence, and how to use it in the real world, this book will provide you with all the information you need in order to leverage various Coherence features properly. It contains a collection of best practice-based solutions and mini-frameworks that will allow you to be more productive from the very beginning.The early chapters cover basics like installation guidelines and caching topologies, before moving on to the domain model implementation guidelines, distributed queries and aggregations, parallel processing, and real-time events. Towards the end, you learn how to integrate Coherence with different persistence technologies, how to access Coherence from platforms other than Java, and how to test and debug classes and applications that depend on Coherence.

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Oracle Coherence 3.5
Aleksandar Seovic
Mar, 2010 | 408 pages
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Table of Contents (22 chapters)
Oracle Coherence 3.5
Oracle Coherence 3.5
Credits
Credits
Foreword
Foreword
About the author
About the author
Acknowledgements
Acknowledgements
About the co-authors
About the co-authors
About the reviewers
About the reviewers
Preface
Preface
Free Chapter
1
Achieving Performance, Scalability, and Availability Objectives
Achieving Performance, Scalability, and Availability Objectives
Achieving performance objectives
Achieving scalability
Achieving high availability
Putting it all together
Summary
2
Getting Started
Getting Started
Installing Coherence
What's in the box?
Starting up the Coherence cluster
Accessing the data grid
Testing and debugging Coherence applications
Summary
3
Planning Your Caches
Planning Your Caches
Anatomy of a clustered cache
Clustered cache topologies
Backing maps
Cache configuration
Summary
4
Implementing Domain Objects
Implementing Domain Objects
Introducing the Coherent Bank sample application
Domain model building blocks
Implementing object serialization
Adding support for schema evolution
Summary
5
Querying the Data Grid
Querying the Data Grid
Built-in filters
Value extractors
Simplifying Coherence queries
Obtaining query results
Using indexes to improve query performance
Coherence query limitations
Aggregators
Summary
6
Parallel and In-Place Processing
Parallel and In-Place Processing
Entry processors
Invocation service
CommonJ Work Manager
Coherence Incubator
Summary
7
Processing Data Grid Events
Processing Data Grid Events
Cache events
Backing map events
Map triggers
Continuous query cache
Summary
8
Implementing the Persistence Layer
Implementing the Persistence Layer
Cache aside
Read-through caching
Implementing read through
Write through
Write behind
Configuring backup with a read-write backing map
Built-in CacheStore implementations
Summary
9
Bridging Platform and Network Boundaries
Bridging Platform and Network Boundaries
Coherence networking
Coherence*Extend overview
Configuring Coherence*Extend
Coherence*Extend limitations
Securing proxy servers
Using network filters
Summary
10
Accessing Coherence from .NET
Accessing Coherence from .NET
.NET client configuration
Implementing the client application
Summary
11
Accessing Coherence from C++
Accessing Coherence from C++
Configuring Coherence C++
Managed object model
Implementing a Coherence C++ client application
Summary
12
The Right Tool for the Job
The Right Tool for the Job
Coherent Bank Sample Application
Coherent Bank Sample Application
Prerequisites
Installation
Deploying the Java Application
Deploying the C++ Application
Deploying the .NET Application
Shutting everything down
Review the code
Index
Index

Obtaining query results

The easiest way to obtain query results is to invoke one of the QueryMap.entrySet methods:

Filter filter = ...;
Set<Map.Entry> results = cache.entrySet(filter);

This will return a set of Map.Entry instances representing both the key and the value of a cache entry, which is likely not what you want. More often than not you need only values, so you will need to iterate over the results and extract the value from each Map.Entry instance:

List values = new ArrayList(results.size());
for (Map.Entry entry : entries) {
    values.add(entry.getValue());
}

After doing this a couple times you will probably want to create a utility method for this task. Because all the queries should be encapsulated within various repository implementations, we can simply add the following utility methods to our AbstractCoherenceRepository class:

public abstract class AbstractCoherenceRepository<K, V extends Entity<K>> {

  ...

  protected Collection<V> queryForValues(Filter...
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