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// '+' denotes addition, '-' denotes deletion.
public interface TaskNameGrouper {
  + @Deprecated
  Set<ContainerModel> group(Set<TaskModel> tasks);

  + @Deprecated
  default Set<ContainerModel> group(Set<TaskModel> tasks, List<String> containersIds) {
    return group(tasks);
  }
  /**
   * @param taskModels, represents the taskModels generated by the SSPGrouper.
   * @param taskLocality, taskName to locationId mapping of the previous generation. 
   * @param processorLocality, processorId to locationId mapping.
   * @return the containerModels generated.   
   */  
  + Set<ContainerModel> group(Set<TaskModel> taskModels, Map<String, String> taskLocality, Map<String, String> processorLocality);
}

+ @Deprecated
public interface BalancingTaskNameGrouper extends TaskNameGrouper {
  + @Deprecated 
  Set<ContainerModel> balance(Set<TaskModel> tasks, LocalityManager localityManager);
}

public class ContainerModel {
  - @Deprecated
  - private final int containerId;
  private final String processorId;
  private final Map<TaskName, TaskModel> tasks;
  + // New field added denoting the physical locationId.
  + private final String locationId;
}

+public interface LocationIdProvider {
   +  // In case of containerized environments, LocationId is a combination of multiple fields (sliceId, containerId, hostname) instead of simple physical hostname,
   +  // This will be provided by the execution environment of the processor.
   + String getLocationId();
}


+ public interface MetadataStore {
   // returns the processorId to LocationId mapping.
  + public Map<String, String> readProcessorLocality(byte[] get(byte[] key);

  //+ returns the taskName to LocationId mapping.
  + public Map<String, String> readTaskLocality(void put(byte[] key, byte[] value);
 
  // writes the provided processordId to host mapping to underlying storage.
  + publicvoid boolean writeProcessorLocality(Map<String, String> processorLocalityremove(byte[] key);
}