Flow
    A dataflow action.
A parameterized and isolated piece of work that becomes eligible for execution within a dataflow scope as soon as all of its input parameters become available.
Implementations can benefit from constructor injection of services using the @Inject annotation. Currently, only a small subset of services is supported:
- ArchiveOperations provides means to operate on archives such as ZIP or TAR files.
- ExecOperations provides means to execute external processes.
- FileSystemOperations provides means to operate on the file system.
/**
 * Plays a given {@link Parameters#getMediaFile() media file} using {@code ffplay}.
 */
class FFPlay implements FlowAction<FFPlay.Parameters> {
    interface Parameters extends FlowParameters {
        @Input
        Property<File> getMediaFile();
    }
    private final ExecOperations execOperations;
    @Inject
    FFPlay(ExecOperations execOperations) {
        this.execOperations = execOperations;
    }
    @Override
    public void execute(Parameters parameters) throws Exception {
        execOperations.exec(spec -> {
            spec.commandLine(
                "ffplay", "-nodisp", "-autoexit", "-hide_banner", "-loglevel", "quiet",
                parameters.getMediaFile().get().getAbsolutePath()
            );
            spec.setIgnoreExitValue(true);
        });
    }
}
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Since
8.1
Parameters
<P>
Parameter type for the dataflow action. Should be FlowParameters.None if the action does not have parameters.