Application Grid Dev with Coherence

A Java Developer’s Introduction to In-Memory Distributed Computing James Bayer Principal Sales Consultant

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Agenda Defining a Data Grid Coherence Clustering Data Management Options Data Processing Options The Coherence Incubator <Insert Picture Here>

<Insert Picture Here> Defining a Data Grid

<Insert Picture Here> “ A Data Grid is a system composed of multiple servers that work together to manage information and related operations - such as computations - in a distributed environment .”

<Insert Picture Here> Coherence Clustering

Coherence Clustering: Tangosol Clustered Messaging Protocol (TCMP) Completely asynchronous yet ordered messaging built on UDP multicast/unicast Truly Peer-to-Peer : equal responsibility for both producing and consuming the services of the cluster Self Healing - Quorum based diagnostics Linearly scalable mesh architecture . TCP-like features Messaging throughput scales to the network infrastructure.

Coherence Clustering: The Cluster Service Transparent , dynamic and automatic cluster membership management Clustered Consensus: All members in the cluster understand the topology of the entire grid at all times . Crowdsourced member health diagnostics

Coherence Clustering: The Coherence Hierarchy One Cluster (i.e. “singleton”) Under the cluster there are any number of uniquely named Services (e.g. caching service) Underneath each caching service there are any number of uniquely named Caches

<Insert Picture Here> Data Management Options

Data Management: Partitioned Caching Extreme Scalability: Automatically, dynamically and transparently partitions the data set across the members of the grid. Pros: Linear scalability of data capacity Processing power scales with data capacity. Fixed cost per data access Cons: Cost Per Access: High percentage chance that each data access will go across the wire. Primary Use: Large in-memory storage environments Parallel processing environments

Data Management: Partitioned Fault Tolerance Automatically, dynamically and transparently manages the fault tolerance of your data. Backups are guaranteed to be on a separate physical machine as the primary. Backup responsibilities for one node’s data is shared amongst the other nodes in the grid.

Data Management: Cache Client/Cache Server Partitioning can be controlled on a member by member basis . A member is either responsible for an equal partition of the data or not (“storage enabled” vs. “storage disabled”) Cache Client – typically the application instances Cache Servers – typically stand-alone JVMs responsible for storage and data processing only.

Data Management: Near Caching Extreme Scalability & Performance The best of both worlds between the Replicated and Partitioned topologies. Most recently/frequently used data is stored locally. Pros: All of the same Pros as the Partitioned topology plus… High percentage chance data is local to request. Cons: Cost Per Update: There is a cost associated with each update to a piece of data that is stored locally on other nodes. Primary Use: Large in-memory storage environments with likelihood of repetitive data access.

Data Management: Data Affinity The ability to associate objects across caches guaranteeing they are located on the same member . Typical Use Case: Parent Child relationships

<Insert Picture Here> Data Processing Options

Data Processing: Events - JavaBean Event Model Listen to all events for all keys ENTRY_DELETED ENTRY_INSERTED ENTRY_UPDATED NamedCache cache = CacheFactory.getCache(“myCache”); cache.addMapListener( listener );

Data Processing: Events - Key Based Event Model Listen to changes to a specific key NamedCache cache = CacheFactory.getCache(“myCache”); cache.addMapListener( listener, key );

Data Processing: Events - Filter Based Event Model Listen to a changes to data that match a specific criteria (i.e. Filter) NamedCache cache = CacheFactory.getCache(“myCache”); cache.addMapListener( listener, filter );

Data Processing: Parallel Query Programmatic query mechanism Queries performed in parallel across the grid Standard indexes provided out-of-the-box and supports implementing your own custom indexes Cost-based analysis of Filter application Standard Filters provided out-of-the-box (e.g. OR, AND, ALL, EQUALS, etc.)

Data Processing: Parallel Query // get the “myTrades” cache NamedCache cacheTrades = CacheFactory.getCache(“myTrades”); // create the “query” Filter filter = new AndFilter( new EqualsFilter("getTrader", traderid), new EqualsFilter("getStatus", Status.OPEN)); // perform the parallel query Set setOpenTrades = cacheTrades.entrySet(filter) ;

Data Processing: Parallel Query

Data Processing: Continuous Query Cache Automatically, transparently and dynamically maintains a view locally based on a specific criteria (i.e. Filter) Same API as all other Coherence caches Support local listeners. Supports layered views

Data Processing: Continuous Query Cache // get the “myTrades” cache NamedCache cacheTrades = CacheFactory.getCache(“myTrades”); // create the “query” Filter filter = new AndFilter( new EqualsFilter("getTrader", traderid), new EqualsFilter("getStatus", Status.OPEN)); // create the continuous query cache NamedCache cqcOpenTrades = new ContinuousQueryCache(cacheTrades, filter) ;

Data Processing: Continuous Query Cache

<Insert Picture Here> End Of Part I

Data Processing: Invocable Map The inverse of caching Sends the processing (e.g. EntryProcessors) to where the data is in the grid Standard EntryProcessors provided Out-of-the-box Once and only once guarantees Processing is automatically fault-tolerant Processing can be: Targeted to a specific key Targeted to a collection of keys Targeted to any object that matches a specific criteria (i.e. Filter)

Data Processing: Invocable Map // get the “myTrades” cache NamedCache cacheTrades = CacheFactory.getCache(“myTrades”); // create the “query” Filter filter = new AndFilter( new EqualsFilter("getTrader", traderid), new EqualsFilter("getStatus", Status.OPEN)); // perform the parallel processing cacheTrades.invokeAll(filter, new CloseTradeProcessor()) ;

Data Processing: Invocable Map

Data Processing: Triggers Inject pre-processing logic to data being added to a cache. Similar to EntryProcessors, but fired before a mutation takes place. They allow your “process” method to override, replace, decorate, remove or fail a cache mutation. Adds veto ability to data insertion. Common Uses: Prevent invalid transactions; Enforce complex security authorizations; Enforce complex business rules; Gather statistics on data modifications;

The Coherence Incubator http://coherence.oracle.com/display/INCUBATOR/

The Coherence Incubator The Coherence Incubator hosts a repository of projects providing example implementations for commonly used design patterns, system integration solutions, distributed computing concepts and other artifacts designed to enable rapid delivery of solutions to potentially complex business challenges built using or based on Oracle Coherence .

The Coherence Incubator: The Command Pattern Distributed implementation of the classic Command Pattern Useful alternative to EntryProcessors with the advantage that Commands are executed asynchronously. Provides essential infrastructure for several other Incubator projects to permit guaranteed, in-order, asynchronous processing of Commands .

The Coherence Incubator: The Command Pattern

The Coherence Incubator: The Functor Pattern This is an example implementation of Function Objects (Wikipedia) or as it is also known, the Functor Pattern, built with Coherence. The Functor Pattern is an extension to the Command Pattern . In fact the semantics are identical with the exception that the Functor Pattern additionally provides a mechanism to return values (or re-throw exceptions) to the Submitter (using Java 5+ Futures ) where as the Command Pattern does not provide such capabilities.

Functor Pattern: Quick Overview Of Auction App Goal Demonstrate the Grid Differentation in WLS Suite Show a close to real life application Coherence Coherence Patterns Grid Messaging Shows WLS JMS and AQ integration Eclipse JPA Best of breed JPA implementation Integration Check points Coherence Web Administrative WLST and Domain templates

What Happens when you create an Auction Uses EclipseLink JPA to store in Oracle RDBMS Registers the Auction in Coherence Enqueues a message to be Delivered in the FUTURE

What happens during bidding? A submit bid goes to coherence context registered Request gets co-located and queued WLS Returns On Coherence Each bid is processed in order Rules are checked Price is updated Stored in Oracle in RDBMS

How do Auctions Close? MDB listens for a dequeue…. If reserve has been meet move to settlement If not mark as closed Auction is removed from the bidding engine

For More Information Visit the Oracle Fusion Middleware 11g web site at http://www.oracle.com/fusionmiddleware11g Oracle WebLogic Server on oracle.com http://www.oracle.com/appserver Oracle Application Grid on oracle.com http://ww.oracle.com/goto/applicationgrid Oracle Fusion Middleware on OTN http://otn.oracle.com/middleware Get Started App Grid Blog http://blogs.oracle.com/applicationgrid For WebLogic Server technical information: http://www.oracle.com/technology/products/weblogic/ For Application Grid technical information http://www.oracle.com/technology/tech/grid/ Resources

Application Grid Dev with Coherence

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