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From "Guillaume Nodet (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KARAF-1640) Make sure the local console is fully working before the user can type commands
Date Fri, 13 Jul 2012 11:26:34 GMT

    [ https://issues.apache.org/jira/browse/KARAF-1640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13413660#comment-13413660
] 

Guillaume Nodet commented on KARAF-1640:
----------------------------------------

Showing the console only once Karaf is started sounds good to me.  We've already done that
in our recent Fuse releases and the main goal was to avoid people starting typing commands
that were not available.

It's really just a heuristic, as the best we can do is wait for all main bundles to be installed
and started.  Given the nature of OSGi, it will be somewhat difficult to display a work in
progress that really is worthwhile, but we can experiment and see how accurate we can be.

Note that the whole thing is kinda pointless if we don't start blueprint bundles synchronously,
but that's already done in etc/config.properties (org.apache.aries.blueprint.synchronous=true)
afaik, so that's fine.  What this means is that the features service initial provisioning
can also be done synchronously, but it will be hard to display such things from the main,
because we don't know in advance which bundles will be installed.

Pressing a key to start the console immediately would be nice too, but this might require
quite a tight coupling between main and the console, we'll see.

Anyway, +1, I like the idea and we'll see how well we can make that work and worthwhile.

                
> Make sure the local console is fully working before the user can type commands
> ------------------------------------------------------------------------------
>
>                 Key: KARAF-1640
>                 URL: https://issues.apache.org/jira/browse/KARAF-1640
>             Project: Karaf
>          Issue Type: Improvement
>            Reporter: Christian Schneider
>             Fix For: 3.0.0
>
>
> The console bundle starts early as it contains jline, gogo and karaf specific console
interfaces and tools that all commands need.
> The problem with this is that the user can start typing commands before all commands
are started. So it can happen that a command is not available at that point. This leads to
(from the user point of view) errors in completion and when executing commands.
> So the idea is to still start the console bundle early but make sure the shell is only
opened when all commands are started.
> As commands often use blueprint to startup we can not simply check the bundle status
as it will be active before the commands are activated.
> So one option to improve the situation is to split the shell starting from the rest of
console and do it in a separate bundle with a high start level. So most of the commands would
be present. Still because of the blueprint startup we could miss some bundles.
> Another option is to start a thread that somehow watches the start of the bundles and
that opens the shell when all bundles are really active. We could use the new status checking
from the bundle module that also can watch spring-dm and blueprint status. The advantage with
this aproach is that we could display the live startup status while waiting.
> We could also allow the user to press e.g. enter to open the console at any point.
> So for example we could show something like this:
> Karaf startup ...
> Press Enter to open a shell now
> Bundles started (11/78), 3 failures

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