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This book is targeted at developers wishing to use JBoss Cache as either a standalone in-memory cache, a distributed or replicated cache, a clustering library, or an in-memory database. It is targeted at application developers who wish to use JBoss Cache in their code base, as well as "OEM" developers who wish to build on and extend JBoss Cache features. As such, this book is split into two major sections - one detailing the "User" API and the other going much deeper into specialist topics and the JBoss Cache architecture.

In general, a good knowledge of the Java programming language along with a strong appreciation and understanding of transactions and concurrent programming is necessary. No prior knowledge of JBoss Application Server is expected or required. For further discussion, use the user forum available on the JBoss Cache website.

If you are interested in the development of JBoss Cache or in translating this documentation into other languages, we'd love to binary options buddy 2 0 virtual trading account 9 tips for new from you. This book is specifically targeted at the JBoss Cache release of the same version number.

It may not apply to older or newer releases of JBoss Cache. It is important that you use the documentation appropriate to the binary options buddy 2 0 virtual trading account 9 tips for new of JBoss Cache you intend to use. I always appreciate feedback, suggestions and corrections, and these should be directed to the developer mailing list rather than direct emails to any of the authors.

We hope you find this book useful, and wish you happy reading! This section covers what developers would need to quickly start using JBoss Cache in their projects. It covers an overview of the concepts and API, configuration and deployment information. JBoss Cache is a tree-structured, clustered, transactional cache. It can be used in a standalone, non-clustered environment, to cache frequently accessed data in memory thereby removing data retrieval or calculation bottlenecks while providing "enterprise" features such as JTA compatibility, eviction and persistence.

JBoss Cache is also a clustered cache, and can be used in a cluster to replicate state providing a high best binary option brokers in canada of failover. A variety of replication modes are supported, including invalidation and buddy replication, and network communications can either be synchronous or asynchronous.

When used in a clustered mode, the cache is an effective mechanism of building high availability, fault tolerance and even load balancing into custom applications and frameworks. POJO Cache offers additional functionality such as:. Based on configuration options selected, this data may be one or all of:. The cache is organized as a tree, with a single root. The only requirement placed on objects that are cached is that they implement java. JBoss Cache can be either local or replicated. Local caches exist only within the scope of the JVM in which they are created, whereas replicated caches propagate any changes to some or all other caches in the same cluster.

A cluster may span different hosts on a network or just different JVMs on a single host. When a change is made to an object in the cache and that change is done in the context of a transaction, the replication of changes is deferred until the transaction completes successfully.

All modifications are kept in a list associated with the transaction of the caller. When the transaction commits, changes are replicated.

Otherwise, on a rollback, we simply undo the changes locally and discard the modification list, resulting in zero network traffic and overhead. For example, if a caller makes modifications and then rolls back the transaction, nothing is replicated, resulting in no network traffic. If a caller has no transaction or batch associated with it, modifications are replicated immediately.

In this sense, running without a batch or transaction can be thought of as analogous as running with auto-commit switched on in JDBC terminology, where each operation is committed automatically binary options buddy 2 0 virtual trading account 9 tips for new immediately. JBoss Cache works out of the box with most popular transaction managers, and even provides an API where custom transaction manager lookups can be written.

The cache is completely thread-safe. It employs multi-versioned concurrency control MVCC to ensure thread safety between readers and writers, while maintaining a high degree of concurrency. The specific MVCC implementation used in JBoss Cache allows for reader threads to be completely free of locks and synchronized blocks, ensuring a very high degree of performance for read-heavy applications. It also uses custom, highly performant lock implementations that employ modern compare-and-swap techniques for writer threads, which are tuned to multi-core CPU architectures.

Optimistic and pessimistic locking schemes from older versions of JBoss Cache are still available but are deprecated in favor of MVCC, and will be removed in future releases.

Use of these deprecated locking schemes are strongly discouraged. See the section on transactions and concurrency for details on MVCC. JBoss Cache requires a Java 5. There is a way to build JBoss Cache as a Java 1. However, Red Hat Inc. See this wiki page for details on building the retroweaved binary for yourself. In addition to Java 5. JBoss Cache ships with all dependent libraries necessary to run out of the box, as well as several optional jars for optional features.

The Cache interface is the primary mechanism for interacting with JBoss Cache. It is constructed and optionally started using the CacheFactory. The cache organizes data into a tree structure, made up of nodes. Once you have a reference to a Cacheyou can use it to look up Node objects in the tree structure, and store data in the binary options buddy 2 0 virtual trading account 9 tips for new.

Note that the diagram above only depicts some of the more popular API methods. Reviewing the javadoc for the above interfaces is the best way to learn the API. Below, we cover some of the main points. An instance of the Cache interface can only be created via a CacheFactory.

This is unlike JBoss Cache 1. The CacheFactory provides a number of overloaded methods for creating a Cachebut they all fundamentally do the same thing:. Here is an example of the simplest mechanism for creating and starting a cache, using the default configuration values:. In this example, we tell the CacheFactory to find and parse a configuration file on the classpath:. In this example, we configure the cache from a file, but want to programatically change a configuration element.

So, we tell the factory not to start the cache, and instead do it ourselves:. Next, lets use the Cache API to access a Node in the cache and then do some simple reads and writes to that node. A Node should be viewed binary options buddy 2 0 virtual trading account 9 tips for new a named logical grouping of data. A node should be used to contain data for a single data record, for example information about a particular person or account.

It should be kept in mind that all aspects of the cache - locking, cache loading, replication and eviction - happen on a per-node basis. As such, anything grouped together by being stored in a single node will be treated as a single atomic unit. The previous section used the Fqn class in its examples; now let's learn a bit more about that class. A Fully Qualified Name Fqn encapsulates a list of names which represent a path to a particular location in the cache's tree structure.

The elements in the list are typically String s but can be any Object or a mix of different types. This path can be absolute i. The Fqn class provides are variety of factory methods; see the javadoc for all the possibilities. The following illustrates the most commonly used approaches to creating an Fqn:. It is good practice to stop and destroy your cache when you are done using it, particularly if it is a clustered cache and has thus used a Binary options buddy 2 0 virtual trading account 9 tips for new channel.

Stopping and destroying a cache ensures resources like network sockets and maintenance threads are properly cleaned up. Not also that a cache that has had stop invoked on it can be started again with a new call to start.

Similarly, a cache that has had destroy invoked on it can be created again with a new call to create and then started again with a start call. Although technically not part of the API, the mode in which the cache is configured to operate affects the cluster-wide behavior of any put or remove operation, so we'll briefly mention the various modes here.

JBoss Cache modes are denoted by the org. See the chapter on Clustering for more details on how cache mode affects behavior. See the chapter on Configuration for info on how to configure things like cache mode. JBoss Cache provides a convenient mechanism for registering notifications on binary options buddy 2 0 virtual trading account 9 tips for new events.

Similar methods exist for removing or querying registered listeners. See the javadocs on the Cache interface for more details. Basically any public class can be used as a listener, provided it is annotated with the CacheListener annotation. In addition, the class needs to have one or more methods annotated with one of the method-level annotations in the org.

Methods annotated as such need to be public, have a void return type, and accept a single parameter of type org. Event or one of its subtypes. CacheStarted - methods annotated such receive a notification when the cache is started. Methods need to accept a parameter type which is assignable from CacheStartedEvent. CacheStopped - methods annotated such receive a notification when the cache is stopped. Methods need to accept a parameter type which is assignable from CacheStoppedEvent.

NodeCreated - methods annotated such receive a notification when a node is created. Methods need to accept a parameter type which is assignable from NodeCreatedEvent.

NodeRemoved - methods annotated such receive a notification when a node is removed. Methods need to accept a parameter type which is assignable from NodeRemovedEvent.

NodeModified - methods annotated such receive a notification when a node is modified. Methods need to accept a parameter type which is assignable from NodeModifiedEvent. NodeMoved - methods annotated such receive a notification when a node is moved. Methods need to accept a parameter type which is assignable from NodeMovedEvent.

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