Gemfire JavaDocs

public interface FixedPartitionResolver<K,​V>
extends PartitionResolver<K,​V>

Implementers of interface FixedPartitionResolver helps to achieve explicit mapping of a "user defined" partition to a data member node.

GemFire uses the partition name returned by getPartitionName(EntryOperation, Set) to determine on which member the data is being managed. Say, for example, you want to partition all Trades according to quarters. You can implement FixedPartitionResolver to get the name of the quarter based on the date given as part of EntryOperation.

public class QuarterPartitionResolver implements FixedPartitionResolver{
    public String getPartitionName(EntryOperation opDetails, Set allAvailablePartitions) {
    Date date = sdf.parse((String)opDetails.getKey());
    Calendar cal = Calendar.getInstance();
    cal.setTime(date);
    int month = cal.get(Calendar.MONTH);
    if (month == 0 || month == 1 || month == 2) {
      return "Quarter1";
    }
    else if (month == 3 || month == 4 || month == 5) {
      return "Quarter2";
    }
    else if (month == 6 || month == 7 || month == 8) {
      return "Quarter3";
    }
    else if (month == 9 || month == 10 || month == 11) {
      return "Quarter4";
    }
    else {
      return "Invalid Quarter";
    }
  }