In this guide, we create a simple task definition and launch the task.
The starting point is to use the Spring Cloud Task App Starters, which provide a set of task applications.
Specifically, we use the provided
timestamp application, which is basically a hello-world-style application that logs the current timestamp. For this guide, we assume that the respective
timestamp task application has already been imported and registered with Spring Cloud Data Flow, as described in the Installation guide.
To create a task:
- In the menu, click Tasks.
Click the Create Task(s) button.
The screen changes to the following:
In the text area, type
timestamp. This creates a simple task definition that uses the Timestamp task application. The following image shows the Timestamp application:
Alternatively, you could have also dragged the Timestamp application from the apps palette on the left to the Flo canvas and connected
ENDwith the task application.
timestamp-taskas the name, as the following image shows:
Create the taskbutton.
The Task Definitions page appears and lists the created definition (
timestamp-task), as the following image shows:
Now that you have defined a task definition, you can run it. To do so:
Click the "play" ("Launch task" if you hover over it) button next to the
timestamp-taskdefinition that you have created in the previous section, as the following image shows:
The UI lets you provide additional:
- Arguments: Any properties that need to be passed as command line arguments.
- Parameters: Additional properties meant for a
As we do not need to provide additional argument or parameters, click the
Launch the taskbutton. The UI returns to the task definitions page, as the following image shows:
After a few moments, the task definition should show a status of "COMPLETE". You may need to press the Refresh button to see the updated status.
To verify that the output is what you expect:
Click on the
Executionstab, as the following image shows:
You can see your task application with an exit code of
0, indicating a successful execution.
Click on the
Show detailsbutton to see even more details, as the following image shows:
If you would also like to see the logged timestamp and you use Spring Cloud Data Flow locally, you can access the log files in the temporary directory (which is defined by
java.io.tmpdir). You should find a file named
stdout.log with contents similar to the following: