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Available as of Camel 2.11
The The controlbus: component provides easy management of Camel applications based on the Control Bus EIP pattern.
For example, by sending a message to an Endpoint you can control the lifecycle of routes, or gather performance statistics.
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controlbus:command[?options]
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Where command can be any string to identify which type of command to use.
Commands
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| {{route}} | To control routes using the {{routeId}} and {{action}} parameter. |
| {{language}} | Allows you to specify a [Language] to use for evaluating the message body. If there is any result from the evaluation, then the result is put in the message body. |
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Options
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Options
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|| Name || Default Value || Description ||
| {{routeId}} | {{null}} | To specify a route by its {{id}}. |
| {{action}} | {{null}} | To denote an action that can be either: {{start}}, {{stop}}, or {{status}}. To either start or stop a route, or to get the status of the route as output in the message body. You can use {{suspend}} and {{resume}} from *Camel 2.11.1* onwards to either suspend or resume a route. And from *Camel 2.11.1* onwards you can use {{stats}} to get performance statics returned in XML format; the {{routeId}} option can be used to define which route to get the performance stats for, if {{routeId}} is not defined, then you get statistics for the entire [CamelContext]. |
| {{async}} | {{false}} | Whether to execute the control bus task asynchronously. *Important:* If this option is enabled, then any result from the task is *not* set on the [Exchange]. This is only possible if executing tasks synchronously. |
| {{loggingLevel}} | {{INFO}} | Logging level used for logging when task is done, or if any exceptions occurred during processing the task. |
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You can append query options to the URI in the following format, ?option=value&option=value&...
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Examples
Using the route
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Command
The route command allows you to do common tasks on a given route very easily, for example to start a route, you can send an empty message to this endpoint:
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template.sendBody("controlbus:route?routeId=foo&action=start", null);
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To get the status of the route, you can do:
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String status = template.requestBody("controlbus:route?routeId=foo&action=status", null, String.class);
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This requires JMX to be enabled (is by default) then you can get the performance statics per route, or for the CamelContext. For example to get the statics for a route named foo, we can do:
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String xml = template.requestBody("controlbus:route?routeId=foo&action=stats", null, String.class);
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The returned statics is in XML format. Its the same data you can get from JMX with the dumpRouteStatsAsXml operation on the ManagedRouteMBean.
To get statics for the entire CamelContext you just omit the the routeId parameter as shown below:
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String xml = template.requestBody("controlbus:route?action=stats", null, String.class);
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You can use the Simple language with the control bus, for example to stop a specific route, you can send a message to the "controlbus:language:simple" endpoint containing the following message:
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template.sendBody("controlbus:language:simple", "${camelContext.stopRoute('myRoute')}");
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As this is a void operation, no result is returned. However, if you want the route status you can do:
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String status = template.requestBody("controlbus:language:simple", "${camelContext.getRouteStatus('myRoute')}", String.class);
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Notice: its easier to use the route command to control lifecycle of routes. The language command allows you to execute a language script that has stronger powers such as Groovy or to some extend the Simple language.
For example to shutdown Camel itself you can do:
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template.sendBody("controlbus:language:simple?async=true", "${camelContext.stop()}");
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Notice we use async=true to stop Camel asynchronously as otherwise we would be trying to stop Camel while it was in-flight processing the message we sent to the control bus component.
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You can also use other languages such as Groovy, etc. |
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- ControlBus EIP
- JMX Component
- Using JMX with Camel