Support manually-triggered reloading

I made some modifications to the plugin and now it can reload the context when someone hits ENTER on the console.

I don't know if it will be applied to the trunk. Anyway, just apply to rev 2228 and add the following configuration in your POM:

<plugins>
...
<plugin>
<groupId>org.mortbay.jetty</groupId>
<artifactId>maven-jetty-plugin</artifactId>
<configuration>
...
<newLineScan>true</newLineScan> <!-- <<< here -->
...
</configuration>
</plugin>
...

This seems ok to me - any comments ?

Jan

seems like a good idea to me, increases the potential for frustration in a user that might not realize that they need to do something to get a change factored into the webapp they are running.

I would change the name of the param to something like <consoleReloadBlocking>true</

A bit clearer for someone just scanning through the params of the jetty plugin to see whats going on.

I know letting the user hits ENTER to reload the application may not be the best way to support smarter reloading. I wanted something to allow me to provide exactly the files I want the plugin to scan in order to automatically reload the application. As you know, today the plugin scans all files. I wanted to tell it to scan just web.xml, for example. So, it would allow me to tell the plugin to reload the application by just touching web.xml.

When I saw this JIRA issue, I thought I might be what I was actually looking for. I'm very satisfied with the results. Now I don't want to use that horrible Tomcat Eclipse WTP integration anymore It gave me an incredible agility.

As I'm not an English speaker, I didn't know the appropriate property name to use in the configuration file.

Things to do after applying the patch:

• please take a goot look at the source comments I entered. I think they deserve correction.
• create an expression to the newLine parameter to allow the user to use -Dxxxxxx in the maven command line

Some things to make things a bit clearer (just in case):

This new scanner is not enabled by default. Nothing has changed to the default plugin behavior. If the user wants to make the plugin scan the application files to detect modifications in order to reload the application, he stills need to set the scanIntervalSeconds property.

When enabled, it will not modify the default behavior, just add a new possibility: to reload all the application if the user hits ENTER on the console.

Both scanners (new line and file scannig) are totally independent. It is possible to use both of them at the same time.

Cristiano,

That is the very thing I'm wondering about. Is it a good thing to have both the background scanner and the on-demand scanner running? There is potential for both to happen at the same time and trip over each other.

Jan

Jan,

Yes, It is a problem, specially because they run in different threads.

What about disabling temporarly the manual scanner when the file scanner detects a change?

I think I can implement that.

why not make them mutually exclusive?

one monitors files for changes and reloads, the other allows the user to tap enter to force a reload

It seems more appropriate.

How do you think the config should be?

I would say that by default its the existing file scanning and reload mechanic...

and then adding in an appropriately named parameter for the console reload that would turn off the existing behavior and enable this new one. that should be feasible, right?

Sure. I'll do that and upload the patch probably on Sunday.

Since I'm not a good English speaker, I'm in doubt about the parameter name. Please suggest one.

maybe...

<consoleForcedReload>true</consoleForcedReload>

If both of them are enabled, should we cancel the excution showing an error or just issue a warning and automatically disable consoleForceReload?

I would just make it so that is consoleForceReload is true then the other is turned off

Here's a new patch:

• Created a new configuration, consoleForceReload. If it's true, the plugin will listen to the console
• If consoleForceReload is true AND scanIntervalSeconds is greater than zero, the plugin will ignore file scanning (behaves like scanIntervalSeconds=0), BUT it will issue a warning to the user on the console.

Some extra:

Added expressions to scanIntervalSeconds and consoleForceReload, so the user is able to configure them 'outside' of POM, by entering
-Djetty.scanIntervalSeconds=X
or
-Djetty.consoleForceReload=true|false
in the mvn command line.

If you decide these parameters aren't nice, just modify the @parameter tags.

Please take a time to review the messages.

oops, the new patch is obviously JETTY-282-2.patch

changed patch a bit so the param looks like

<reload>automatic</reload>

or

<reload>manual</reload>

it defaults to automatic which was the old behavior

Can you please patch this into 6.1 branch? since it seems that 6.1 will be here for a long haul and this feature is very useful, at least in my case for GWT development in combination with Jetty and Spring.

this is in the jetty-7 released version already, and will be going out with 6.1.12 release

reopenning to fix fix versions

fixed for 6.1.12