[FELIX-4575] Unexpected behavior using proxies in declarative services

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Not A Problem
• Component/s: Declarative Services (SCR)
• Labels: proxy references scr
• Environment: Operating System: Windows 8; Software platform: Java 1.7.0_45 with ; - org.eclipse.osgi (3.9.1.v20140110-1610); - org.apache.felix.scr (1.8.2)
• Assignee: Unassigned
• Reporter: Malte Burkert
• Created: 22/Jul/14 10:23
• Updated: 25/Jul/14 09:46
• Resolved: 25/Jul/14 09:46

Description

I have created the following setup which always shows the wrong and unexpected behavior, which I describe after the setup.

===Setup===
.Hook-Bundle consisting of:

• Hook implementing EventListenerHook and FindHook
  > overridden event(event, listeners): creates new proxy instance with InvocationHandlerProxy and registers the service (only services with a MANAGED property become proxied)
  > overridden find(bundleContext, name, filter, allServices, references): removes non-proxied services with a MANAGED property from references
• InvocationHandlerProxy implementing InvocationHandler
  > overriden invoke(proxy, method, args): logging invocation to system.out and invokes the passed method on the passed service

.Dateservice-Bundle
registers Service which returns current date; has component property MANAGED defined in the related component description

.Multiplyservice-Bundle
returns the product of the numbers; has component property MANAGED defined in the related component description

.Test-Bundle consisting of:

• Test implementing CommandProvider
  > _test(commandInterpreter): gives an command line interface for executing the test by using the command "test"; test consists of calling the Dateservice and Multiplyservice and prints the results with the callee's classes (to check if proxy is called or not)
  > setter for Dateservice and Multiplyservice, which get called as soon as service references are fulfilled (both are described as static 1..1 service references by the component description)
  > unsetter for Dateservice and Multiplyservice, which get called as soon as at least on of the service references is not fulfilled any more

===Test Scenarios showing the unexpected behavior===
-Test-Scenario 1:
1. Start Hook-Bundle
2. Start Test-Bundle
3. Start Multiplyservice-Bundle
4. Start Dateservice-Bundle
5. Execute "test"

>Expected result: Dateservice and Multiplyservice become proxied, test calls methods on proxies
>Observed result: Both proxies are created, but only the Dateservice-Proxy is passed to the corresponding setter in the Test-class; test calls method on Dateservice's Proxy and Multiplyservice

-Test-Scenario 2:
1. Start Hook-Bundle
2. Start Test-Bundle
3. Start Dateservice-Bundle
4. Start Multiplyservice-Bundle
5. Execute "test"

>Expected result: Dateservice and Multiplyservice become proxied, test calls methods on proxies
>Observed result: Both proxies are created, but only the Multiplyservice-Proxy is passed to the corresponding setter in the Test-class; test calls method on Multiplyservice's Proxy and Dateservice

-Test-Scenario 3:
1. Start Hook-Bundle
2. Start Dateservice-Bundle
3. Start Multiplyservice-Bundle
4. Start Test-Bundle
5. Execute "test"
6. Stop Multiplyservice-Bundle
7. Start Multiplyservice-Bundle
8. Execute "test"
9. Stop Dateservice-Bundle
10. Start Dateservice-Bundle
11. Execute "test"
12. Stop Multiplyservice-Bundle
13. Start Multiplyservice-Bundle
14. Execute "test"
15. Stop Test-Bundle
16. Start Test-Bundle
17. Execute "test"

>Expected result: whenever Dateservice-, Multiplyservice- or Test-Bundle are started executing test should make calls on the Proxies of Dateservice and Multiplyservice
>Observed results in executing test in step:
5: everything as expected
8. everything as expected
11. only proxy for Dateservice called
14. only proxy for Multiplyservice called
17. everything as expected