@Override
  public void fromData(DataInput in,
      DeserializationContext context) throws IOException, ClassNotFoundException {
    super.fromData(in, context);
    refreshInterval = in.readLong();
    alertDefs = (StatAlertDefinition[]) DataSerializer.readObjectArray(in);
  }
A callback used by GemFire Data Serialization mechanism to read from a stream.

@param in DataInput stream to read from
geode-core/src/main/java/org/apache/geode/internal/admin/remote/StatAlertsManagerAssignMessage.java