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JSR 350 State Management

Overview and update JSR Expert Group. JSR 350 State Management. Overview. Background Why a JSR for State Management Key concepts Relationship to other standards Example API Demo Timeline Q & A. In a nutshell….

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JSR 350 State Management

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  1. Overview and update JSR Expert Group JSR 350 State Management

  2. Overview • Background • Why a JSR for State Management • Key concepts • Relationship to other standards • Example API • Demo • Timeline • Q & A

  3. In a nutshell… JSR-350 is an API for finding and using state management services to save and retrieve data independent of the storage method.

  4. Background • Standard formed through JCP (2.8  2.9) • Oracle lead (Mitch Upton), participation from Red Hat, IBM and independents • Expert group activated April 2012 • Some existing proprietary solutions in WebLogic, Tomcat and JBoss

  5. Requirements • “…develop an API that applications and JavaEE containers can use to offload the responsibility of state management into third party providers with different quality of service characteristics” (JSR) • Standardize existing APIs • Support a wider variety of data representations (JSON, XML, name value) • Expand storage mechanisms (NoSQL, Graph DB, In Memory)

  6. Use Cases • Cloud - loose coupling of apps to state management facilities • Mobile - cross platform state handling • Integration - Transfer of state between platforms • Capability based provider querying • Transient data e.g. session state • Non relational data e.g. JSON, XML, JavaScript

  7. Value of State Management (over Existing APIs) • Independent storage mechanism – not specific to DBMS, file, etc. • Access service by capability instead of low level configuration • Manage state with strongly or weakly-typed approach • Pluggable marshalling of types

  8. Contrast to Persistence APIs • JPA • Strongly typed • Assumes relational storage • JDBC • SQL access but must manage ORM, integrity, transactions • Deep technical knowledge • EJB • Complex • Java I/O • Complex, low level

  9. Design Goals • Store and retrieve state independent of mechanism • Modular and consistent implementation • Capability based matching of client and provider • Support innovation and the cloud • Easy to use interfaces – user, provider, platform

  10. API to Multiple Providers JEE Client JSE Client State Management API Built-in Provider Custom Provider 3rd party Provider

  11. Key Concepts • State (State Container) • State Connection Factory • State Connection • State Container • State Map • Capability

  12. State • Unit of data • Uniquely identified within a scope • Persistent for a business period • Used by web apps, web services, JSF, CDI • Currently implemented via in memory, file, database, cluster

  13. State Container • Container for a user-defined state value that allows a State Management provider to present and track system-level details about the value • An instance of State contains a single user-specified value

  14. State Connection Factory • Create one or more State Connections based on required capabilities • Associated to single provider • Typed e.g. Java class (…probably)

  15. State Connection • Connection to state management services provided by some provider • Expose capabilities • Contains configuration • Controls the transaction – either local or distributed using JTA • Use directly or to get a StateMap

  16. State Map • Exposes only entries with a given key and value type in StateConnection • Convenience interface - clients deal directly with user-specified key and value types, no need to see containing structures such as Key and StateContainer • Contains: • globally unique key • value of a user-defined type • tracking information • Key • User defined + GUID • Values • Java type (e.g. Person class) • Streams? • XML?

  17. Capability - QoS • Behaviour offered by a provider • Durability • Transactions • Isolation and concurrency control • Supported by configuration • Described by a unique name

  18. State Classes State Management Registry State Connection Factory 1 0..* 1 0..* State Connection 1 0..* 1 State Container 0..* 0..* State Map 1

  19. Getting a Connection State Management Registry Client Application State Connection Factory State Connection Find State Connection Factory Create Get State Connection Create State Connection

  20. Using a StateContainer State Container Client Application Key Dog State Connection new (“fido”, “Sheperd”) createKey(fido.getUniqueName(), String.class, Dog.class) create fidoKey Store put(fidoKey, fido) create StateContainerfidoState get(fidoKey) Retrieve fido copy

  21. Using a StateMap State Map Client Application Dog State Connection new (“fido”, “Sheperd”) getStateMap(String.class, Dog.class) create Store StateMapdogMap put(fidoKey, fido) get(fidoKey) Retrieve fido copy

  22. Standards View 350  347 (107) Client State Management API (350) Data Grid API (347)

  23. Standards View 347  350 Client Data Grid API (347) State Management API (350)

  24. Standards View 350 &347 Client State Management API (350) Data Grid API (347) State Management API (350)

  25. Roles • Provider • Implement the specification • Innovate with new capabilities • Administrator / Developer • Configure the state connection factory • Make a State Connection available • Developer • Use State Connection and State to accelerate development

  26. Example - StateConnection

  27. Example - StateContainer

  28. Example – get/put StateContainer

  29. Get a StateMap

  30. put/get a Dog/Person

  31. Demo

  32. Design Debates • Typing • Strong versus weak • Is StateMap necessary / desirable?

  33. Next steps • Expected milestones • How to provide feedback

  34. Q & A

  35. Further Information • Java State Management Wiki http://java.net/projects/java-state-managemen • JavaOnepresentation http://java.net/downloads/java-state-managemen/2011-J1-Java-State-Management-v2.ppt • The spec http://www.jcp.org/en/jsr/detail?id=350

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