public virtual IList <string> Execute(CommandContext commandContext)
{
EnsureUtil.EnsureNotNull("executionId", ExecutionId);
// fetch execution
IExecutionManager executionManager = commandContext.ExecutionManager;
ExecutionEntity execution = executionManager.FindExecutionById(ExecutionId);
EnsureUtil.EnsureNotNull("execution " + ExecutionId + " doesn't exist", "execution", execution);
CheckGetActivityIds(execution, commandContext);
// fetch active activities
return(execution.FindActiveActivityIds());
}