Timer Log

The hello of Camel in one file: a timer fires every second and a log line prints the greeting from application.properties.

What you will see

INFO ... timer-log.camel.yaml:13 : Hello Camel!
INFO ... timer-log.camel.yaml:13 : Hello Camel!
INFO ... timer-log.camel.yaml:13 : Hello Camel!

Install Camel CLI

Install JBang and the Camel CLI as described in the root README; camel --version confirms the install.

Run it

camel run *

Stop it with ctrl + c, or from another terminal with camel stop timer-log.

How it works

• timer-log.camel.yaml is the route: from a timer that fires every timer.period milliseconds, a setBody puts the greeting in the message, and a log prints the body.
• application.properties holds the period and the greeting. {{timer.period}} and {{greeting.message}} in the route are property placeholders, resolved when the route starts.
• The Camel CLI reads every file in the directory: the route because it ends in .camel.yaml, the properties because of their name.

Build it step by step

Ask your assistant, or type it yourself, one step at a time, and run after each:

1. A route from a timer that logs “Hello Camel!” every second.
2. Move the greeting to application.properties and set the body from the property.
3. Move the period to a property too.

Try changing

• timer.period=5000 for a greeting every five seconds; the route file does not change.
• Add repeatCount: 3 to the timer parameters and the timer stops after three greetings.
• Log ${date:now:HH:mm:ss} ${body} to see when each line was written.

Integration testing

The example comes with a test in the Citrus YAML DSL, test/timer-log.citrus.it.yaml, which the Camel CLI runs:

camel test run test/timer-log.citrus.it.yaml

The test starts the route and verifies the logged greeting.

Help and contributions

If you hit any problem using Camel or have some feedback, then please let us know.

We also love contributors, so get involved :-)

The Camel riders!