package org.apache.cassandra.stress.operations;
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import org.apache.cassandra.db.ColumnFamilyType;
import org.apache.cassandra.stress.Session;
import org.apache.cassandra.stress.util.CassandraClient;
import org.apache.cassandra.stress.util.Operation;
import org.apache.cassandra.thrift.Compression;
import org.apache.cassandra.thrift.CqlResult;
public class CqlReader extends Operation
{
private static String cqlQuery = null;
public CqlReader(Session client, int idx)
{
super(client, idx);
}
public void run(CassandraClient client) throws IOException
{
if (session.getColumnFamilyType() == ColumnFamilyType.Super)
throw new RuntimeException("Super columns are not implemented for CQL");
if (cqlQuery == null)
{
StringBuilder query = new StringBuilder("SELECT ");
if (session.columnNames == null)
{
if (session.cqlVersion.startsWith("2"))
query.append("FIRST ").append(session.getColumnsPerKey()).append(" ''..''");
else
query.append("*");
}
else
{
for (int i = 0; i < session.columnNames.size(); i++)
{
if (i > 0) query.append(",");
query.append('?');
}
}
query.append(" FROM ").append(wrapInQuotesIfRequired("Standard1")).append(" USING CONSISTENCY ")
.append(session.getConsistencyLevel().toString());
query.append(" WHERE KEY=?");
cqlQuery = query.toString();
}
List<String> queryParams = new ArrayList<String>();
if (session.columnNames != null)
for (int i = 0; i < session.columnNames.size(); i++)
queryParams.add(getUnQuotedCqlBlob(session.columnNames.get(i).array()));
byte[] key = generateKey();
queryParams.add(getUnQuotedCqlBlob(key));
String formattedQuery = null;
long start = System.currentTimeMillis();
boolean success = false;
String exceptionMessage = null;
for (int t = 0; t < session.getRetryTimes(); t++)
{
if (success)
break;
try
{
CqlResult result = null;
if (session.usePreparedStatements())
{
Integer stmntId = getPreparedStatement(client, cqlQuery);
result = client.execute_prepared_cql_query(stmntId, queryParamsAsByteBuffer(queryParams));
}
else
{
if (formattedQuery == null)
formattedQuery = formatCqlQuery(cqlQuery, queryParams);
result = client.execute_cql_query(ByteBuffer.wrap(formattedQuery.getBytes()),
Compression.NONE);
}
success = (result.rows.get(0).columns.size() != 0);
}
catch (Exception e)
{
exceptionMessage = getExceptionMessage(e);
success = false;
}
}
if (!success)
{
error(String.format("Operation [%d] retried %d times - error reading key %s %s%n with query %s",
index,
session.getRetryTimes(),
new String(key),
(exceptionMessage == null) ? "" : "(" + exceptionMessage + ")",
cqlQuery));
}
session.operations.getAndIncrement();
session.keys.getAndIncrement();
session.latency.getAndAdd(System.currentTimeMillis() - start);
}
}