@Override
@SuppressWarnings("deprecation")
public void perform(Arguments arguments, PrintStream output) throws Exception {
String[] programIdParts = arguments.get(elementType.getArgumentName().toString()).split("\\.");
String appId = programIdParts[0];
int instances;
switch (elementType) {
case FLOWLET:
if (programIdParts.length < 3) {
throw new CommandInputError(this);
}
String flowId = programIdParts[1];
String flowletId = programIdParts[2];
instances = programClient.getFlowletInstances(appId, flowId, flowletId);
break;
case WORKER:
if (programIdParts.length < 2) {
throw new CommandInputError(this);
}
String workerId = programIdParts[1];
instances = programClient.getWorkerInstances(appId, workerId);
break;
case SERVICE:
if (programIdParts.length < 2) {
throw new CommandInputError(this);
}
String service = programIdParts[1];
instances = programClient.getServiceInstances(appId, service);
break;
default:
// TODO: remove this
throw new IllegalArgumentException(
"Unrecognized program element type for scaling: " + elementType);
}
output.println(instances);
}
@Override
public String getPattern() {
return String.format(
"get %s instances <%s>", elementType.getName(), elementType.getArgumentName());
}