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Bug 331693

Summary:	Migrate Virgo kernel to DS
Product:	[RT] Virgo	Reporter:	Borislav Kapukaranov <b.kapukaranov>
Component:	unknown	Assignee:	Project Inbox <virgo-inbox>
Status:	NEW ---	QA Contact:
Severity:	enhancement
Priority:	P3	CC:	glyn.normington
Version:	unspecified
Target Milestone:	---
Hardware:	PC
OS:	All
See Also:	https://bugs.eclipse.org/bugs/show_bug.cgi?id=333474
Whiteboard:
Bug Depends on:	389712, 396771, 333643
Bug Blocks:

Description Borislav Kapukaranov

2010-12-02 11:44:24 EST

Build Identifier: 

The proposal is to use declarative services in Virgo's kernel.

Reproducible: Always

Comment 1 Glyn Normington

2010-12-02 11:49:50 EST

We discussed this change at the Virgo F2F and it seems like a good direction to go in. However, we need to reproduce some of the support that Virgo has for Spring DM.

Firstly, we need the ability to wait for a bundle to be fully started, meaning it has been activated and its component has been built successfully. We also need to be able to obtain the reason for failure in the failure case.

Secondly, we need to track bundles which are waiting for their service dependencies to be satisfied and issue warnings to the console when this wait exceeds a certain period.

Comment 2 Glyn Normington

2010-12-03 04:59:22 EST

Another consideration is thread safety. DS does not use constructor injection so it will be necessary to use synchronization (via an internal "monitor" object as usual for Virgo) to ensure thread safety.

Comment 3 Borislav Kapukaranov

2011-01-17 09:54:11 EST

As part of this enhancement a bug that removes kernel's startup order was raised:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=333474

Comment 4 Borislav Kapukaranov

2012-01-12 09:32:15 EST

Commit 5ef9751 migrates Nano to DS and stops packaging SpringDM and its Spring framework dependencies in Nano, resulting in a reduced size.

This can't be applied to higher distributions yet as they still rely on SpringDM usage in their kernel regions.
Still it is OK as a first step.