Package org.gradle.api.flow

Interface FlowAction<P extends FlowParameters>

Type Parameters:

P - Parameter type for the dataflow action. Should be FlowParameters.None if the action does not have parameters.

@Incubating
public interface FlowAction<P extends FlowParameters>

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);
         });
     }
 }
 

Since:

8.1

See Also:

• FlowScope
• FlowProviders

Method Summary

Modifier and Type	Method	Description
void	execute(P parameters)

Method Details

execute

void execute(P parameters)
      throws Exception

Throws:

Exception