Reference Guide

}
return alert;
}
getColumnDecoder()
getColumnDecoder–This method takes a column as argument and returns the data type of that
column to the caller. This is required for reading the columns in correct format.
CassandraAlertDao.java:
@Override
protected ColumnDecoder<String, ?> getColumnDecoder(
ColumnName<String, ?> columnName) {
if (columnName == null) {
throw new NullPointerException(...);
}
if (AlertColumnFamily.SEVERITY_COL_NAME.equals(columnName)) {
return AlertColumnFamily.SEV_DECODER;
} else if (AlertColumnFamily.TIMESTAMP_COL_NAME.equals(columnName)) {
return DateColumnDecoder.getInstance();
} else if (AlertColumnFamily.DESC_COL_NAME.equals(columnName) ||
AlertColumnFamily.ORIGIN_COL_NAME.equals(columnName) ||
AlertColumnFamily.TOPIC_COL_NAME.equals(columnName) ||
AlertColumnFamily.SYS_ID_NAME.equals(columnName)) {
return StringColumnDecoder.getInstance();
} else if (AlertColumnFamily.STATE_COL_NAME.equals(columnName)) {
return BooleanColumnDecoder.getInstance();
}
return null;
}
createStorableInstance()
This method converts the DTO into a storable format. Storable format is the one which underlying
database client code understands. More on this in the next section.
CassandraAlertDao.java:
@Override
protected CassandraStorable<String, String>
createStorableInstance(CassandraAlert transportable) {
CassandraStorable<String, String> storable =
new CassandraStorable<String, String> (
transportable.uid(), transportable.getSysId());
storable.setColumn(new StringColumn<String>(
AlertColumnFamily.SYS_ID_NAME, transportable.getSysId()));
storable.setColumn(new StringColumn<String>(
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