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Introduction

wotaskd and JavaMonitor were open sourced when WebObjects 5.4 was released in 2007. In 2008 and 2009, the source was modified and included in Project Wonder. This is the list of additions that were added to the Wonder versions of the tools.

Statistics

If you call http://monitorhost:port/cgi-bin/WebObjects/JavaMonitor.woa/wa/statistics, the answer send you back statistics, in JSON format, about instances, per application. Sample :

(
	{
		"configuredInstances" = "2";
		"maxSessions" = "0";
		"maxAvgIdleTime" = "2.078";
		"avgTransactions" = "44.0000";
		"sumSessions" = "0";
		"avgAvgTransactionTime" = "0.0985000";
		"refusingInstances" = "0";
		"avgSessions" = "0.0000";
		"maxTransactions" = "88";
		"applicationName" = "AjaxExample";
		"avgAvgIdleTime" = "1.0390000";
		"maxAvgTransactionTime" = "0.197";
		"runningInstances" = "2";
		"sumTransactions" = "88";
	},
	{
		"configuredInstances" = "2";
		"maxSessions" = "0";
		"maxAvgIdleTime" = "325.443";
		"avgTransactions" = "0.5000";
		"sumSessions" = "0";
		"avgAvgTransactionTime" = "0.00000";
		"refusingInstances" = "0";
		"avgSessions" = "0.0000";
		"maxTransactions" = "1";
		"applicationName" = "AjaxExample2";
		"avgAvgIdleTime" = "162.7215000";
		"maxAvgTransactionTime" = "0.0";
		"runningInstances" = "2";
		"sumTransactions" = "1";
	}
)

If JavaMonitor is configured with a password, and I hope you do, pass pw=monitorpassword as a argument to the query :

http://monitorhost:port/cgi-bin/WebObjects/JavaMonitor.woa/wa/statistics?pw=monitorpassword

Direct Actions to many tasks

You can do most of the standard tasks you do in Monitor by calling direct actions. They are in a different query handler, /admin. They follow the same format and use the same query parameters. Those DA can be useful if you need to restart instances or other tasks within ant or other build/deployment systems.

?type=all : return details about all applications and instances
?type=app&name=AppName : return details about all instances of a specific application
?type=ins&name=AppName-InstanceNo : return details about one specific instance

For example, if you want to get details about all instances and applications, you call :

http://hostname:56789/cgi-bin/WebObjects/JavaMonitor.woa/admin/info?type=all

To get details about the AjaxExample application :

http://hostname:56789/cgi-bin/WebObjects/JavaMonitor.woa/admin/info?type=app&name=AjaxExample

And for a specific instance :

http://hostname:56789/cgi-bin/WebObjects/JavaMonitor.woa/admin/info?type=ins&name=AjaxExample-1

The response for the direct actions will either send a JSON array or YES/NO. For example, the query info for all instances will return :

[Hudson Build Server for Wonder|http://webobjects.mdimension.com/hudson/job/Wonder54/lastSuccessfulBuild/artifact/dist/]

List of available direct actions :

/info : return details (number of deaths, state, etc.; see above), in JSON, about an instance.
/running : return YES if the instance is running, NO if not.
/stopped : return NO if the instance is running, YES if not.
/bounce: more on it later.
/clearDeaths : clear the number of deaths (same action as clicking the "Clear deaths" in JavaMonitor)
/turnScheduledOn : turn scheduling on for an application or instance. Call /turnScheduledOff to do the opposite.
/turnRefuseNewSessionsOn : turn "Refuse new sessions" on, call turnRefuseNewSessionsOff to do the opposite.
/turnAutoRecoverOn : guess what? It activate "Auto recover"! And guess again? /turnAutoRecoverOff do the opposite!
/forceQuit : force quit an application, might be useful to call it from a monitoring system.
/stop : stop an application/instance the normal way.
/start : start an application/instance the normal way.

Automatic archive of SiteConfig.xml

On every change you do to the configuration, a backup of SiteConfig.xml will be done in, by default, /Library/WebObjects/Configuration.

Bounce feature

In the "list instances" page, you get a "Bounce" action link. This action only work if you have at least one active instance and one inactive. What it does is :

  • Find the inactive (eg : not started) instance and start it
  • Find the active instances (minus the one started the step below) and enable "Refuse New Session"
  • Bounce the active instances when the minimum session count is reached

This feature, from my understanding, allow you to upload new versions of your app, start up the new version and refuse sessions for the instances running on the older version. I don't know how this will work if your new version use migrations to change your schema (eg : old instances might raise exceptions because of database schema changes), so try it out on a test server before and put your results here.

REST routes

On September 28th 2010, REST routes were added in JavaMonitor. Those routes + the direct actions explained in this document allow you to control almost everything remotely (make sure that your JavaMonitor installation is secure!). As the direct actions, append ?pw=XXXX to the URLs if JavaMonitor is password protected.

Examples of REST calls :

Fetching the details of all applications :

curl -X GET http://127.0.0.1:56789/cgi-bin/WebObjects/JavaMonitor.woa/ra/mApplications.json

Adding a new application :

curl -X POST -d "{id: 'AjaxExample',type: 'MApplication', name: 'AjaxExample',unixOutputPath: '/opt/Local/Library/WebObjects/Logs', unixPath: '/opt/Local/Library/WebObjects/Applications/AjaxExample.woa/AjaxExample'}" http://127.0.0.1:56789/cgi-bin/WebObjects/JavaMonitor.woa/ra/mApplications.json

Adding a new instance :

curl -X GET http://127.0.0.1:56789/cgi-bin/WebObjects/JavaMonitor.woa/ra/mApplications/AjaxExample/addInstance&host=localhost

Delete an application :

curl -X DELETE http://127.0.0.1:56789/cgi-bin/WebObjects/JavaMonitor.woa/ra/mApplications/AjaxExample.json

Delete an instance :

curl -X GET http://127.0.0.1:56789/cgi-bin/WebObjects/JavaMonitor.woa/ra/mApplications/AjaxExample/deleteInstance?id=1

Adding a new host :

curl -X POST -d "{id: 'otherserver.com',type: 'MHost', osType: 'MACOSX',address: '192.168.20.5', name: 'otherserver.com'}" http://127.0.0.1:56789/apps/WebObjects/JavaMonitor.woa/ra/mHosts.json

Misc

The community's improved versions of wotaskd.woa and JavaMonitor.woa are now available as full Wonder applications. You can download them pre-built from the Hudson Wonder build server.

Alternatively you can build them from Wonder source and embed the frameworks or copy the frameworks into the appserver user home (on OS X 10.5, it's in /var/empty).

If you build everything from Wonder source, you can run :

ant deployment.tools -Dwonder.patch=54 -Ddeployment.standalone=true

Please note that you have to build the Wonder before calling ant deployment.tools, if you get classpath errors when building the deployment tools, first run:

ant frameworks
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