1. Errai-CDI Integration
Heiko Braun <hbraun@redhat.com>
Apr 2010

2. Topics
• Use cases
• CDI Concepts
• Bootstrap process
• Invocation Handling
• Status & Roadmap
2

3. Use cases
• Initially
• Declaring a CDI component as Service
• Exposing a CDI component as RPC endpoint
• Integrating with the CDI event subsystem
3

4. Declaring Services
GWT Client
• Most low level use cases
• Similar to MessageDriven
Bean
• Service implementation CDI Component
fully managed by CDI
container
4

5. Exposing RPC endpoints
GWT Client
• Exposes a typed
interface
• Similar to EJB Session
beans
CDI Component
Remote interface
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6. Working with CDI events
• Bi-directional event GWT Client
exchange
• Discriminate on:
- Event Type
- Qualifier
Annotations
• Exposes high level
CDI Component
CDI client API
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7. CDI Concepts
• Portable Extensions
• Integration point when container bootstraps
• Create beans, annotation processing, meta data
modifications
• Scope & Lifecycle
• ApplicationScoped, RequestScoped, ConversationScoped
• Bean context & reference
• Lookup and instance (reference) creation
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8. Bootstrap process
• Two phases: CDI -> Errai Bootstrap
• Ordering important
• CDI Service discovery first
• Services instances are maintained by CDI
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9. Service discovery
• Provide injection points
for Errai Components
• Discover Errai
annotations during CDI
bootstrap
• Provide service proxies
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10. Invocation Handling
• Encapsulated in
invocation proxy
• Lookup bean
reference
(instance)
• Context & Scope
managed by CDI
10

11. Invocation proxies
Bean invocation (RPC)
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12. Event dispatcher
CDI Observer
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13. Event client boilerplate
GWT Client
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14. Status
• Project:
http://anonsvn.jboss.org/repos/errai/projects/
weld-integration/trunk
• Basic use cases covered
• Incorporate feedback from the CDI team
• Clarification on Errai RPC API
14

15. Roadmap
• More work on Bean scopes:
• Session-, Request-, ConversationScoped
• Integration with EJB3
• Stateless, Stateful session beans
• Transactions, Security, etc:
• Context propagation
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