[FELIX-4120] Allow external entity to interact during the service resolution

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: ipojo-runtime-1.10
• Fix Version/s: ipojo-runtime-1.10.1
• Component/s: iPOJO
• Assignee: Clement Escoffier
• Reporter: Clement Escoffier
• Created: 12/Jun/13 10:09
• Updated: 17/Jun/13 05:47
• Resolved: 12/Jun/13 12:21

Description

When iPOJO is tracking services, it should let extenral entities to intercept service resolution to determine the services to use.

With this feature it is possible to:

• mark services
• change filters, even build filter chains
• update the selected services dynamically

Two interception are supported:

• tracking : allow filtering out and transforming references. Transformation changes the properties of the reference
• ranking : sort the set of references

Both interceptors are exposed as services and are plugged on the service dependency dynamically. Obviously they can leave and arrive at runtime. To manage a dependency, they expose a service property named 'target' which is a LDAP filter selecting a set of dependencies.