@SuppressWarnings("unchecked")
@Override
public void multiPut(List<List<Object>> keys, List<T> values) {
LOG.debug("Putting the following keys: {} with values: {}", keys, values);
try {
List<Statement> statements = new ArrayList<Statement>();
// Retrieve the mapping statement for the key,val pair
for (int i = 0; i < keys.size(); i++) {
List<Object> key = keys.get(i);
T val = values.get(i);
Statement retrievedStatment = mapper.map(key, val);
if (retrievedStatment
instanceof BatchStatement) { // Allows for BatchStatements to be returned by the mapper.
BatchStatement batchedStatment = (BatchStatement) retrievedStatment;
statements.addAll(batchedStatment.getStatements());
} else {
statements.add(retrievedStatment);
}
}
// Execute all the statements as a batch.
BatchStatement batch = new BatchStatement(batchType);
batch.addAll(statements);
session.execute(batch);
_mwrites.incrBy(statements.size());
} catch (Exception e) {
checkCassandraException(e);
LOG.error("Exception {} caught.", e);
}
}
////////////////////////////////////
// Overridden Methods for IBackingMap
////////////////////////////////////
@SuppressWarnings("unchecked")
@Override
public List<T> multiGet(List<List<Object>> keys) {
try {
List<T> values = new ArrayList<T>();
for (List<Object> rowKey : keys) {
Statement statement = mapper.retrieve(rowKey);
ResultSet results = session.execute(statement);
// TODO: Better way to check for empty results besides accessing entire results list
Iterator<Row> rowIter = results.iterator();
Row row;
if (results != null && rowIter.hasNext() && (row = rowIter.next()) != null) {
if (rowIter.hasNext()) {
LOG.error("Found non-unique value for key [{}]", rowKey);
} else {
values.add((T) mapper.getValue(row));
}
} else {
values.add(null);
}
}
_mreads.incrBy(values.size());
LOG.debug("Retrieving the following keys: {} with values: {}", keys, values);
return values;
} catch (Exception e) {
checkCassandraException(e);
throw new IllegalStateException("Impossible to reach this code");
}
}