public class ShellFeed
extends AbstractFeed

Provides a feed of attribute values, by executing shell commands (on the local machine where this instance of brooklyn is running). Useful e.g. for paas tools such as Cloud Foundry vmc which operate against a remote target. Example usage (e.g. in an entity that extends SoftwareProcessImpl):

 private ShellFeed feed;
 
 //@Override
 protected void connectSensors() {
   super.connectSensors();
   
   feed = ShellFeed.builder()
       .entity(this)
       .machine(mySshMachineLachine)
       .poll(new ShellPollConfig<Long>(DISK_USAGE)
           .command("df -P | grep /dev")
           .failOnNonZeroResultCode(true)
           .onSuccess(new Function<SshPollValue, Long>() {
                public Long apply(SshPollValue input) {
                  String[] parts = input.getStdout().split("[ \\t]+");
                  return Long.parseLong(parts[2]);
                }}))
       .build();
 }
 
 {@literal @}Override
 protected void disconnectSensors() {
   super.disconnectSensors();
   if (feed != null) feed.stop();
 }