/*
* 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.
*/
package org.apache.cassandra.transport.messages;
import java.nio.ByteBuffer;
import java.util.Collections;
import java.util.UUID;
import com.google.common.collect.ImmutableMap;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.apache.cassandra.cql3.QueryProcessor;
import org.apache.cassandra.cql3.QueryOptions;
import org.apache.cassandra.db.ConsistencyLevel;
import org.apache.cassandra.exceptions.*;
import org.apache.cassandra.service.QueryState;
import org.apache.cassandra.tracing.Tracing;
import org.apache.cassandra.transport.*;
import org.apache.cassandra.utils.UUIDGen;
/**
* A CQL query
*/
public class QueryMessage extends Message.Request
{
public static final Message.Codec<QueryMessage> codec = new Message.Codec<QueryMessage>()
{
public QueryMessage decode(ChannelBuffer body, int version)
{
String query = CBUtil.readLongString(body);
if (version == 1)
{
ConsistencyLevel consistency = CBUtil.readConsistencyLevel(body);
return new QueryMessage(query, consistency);
}
else
{
return new QueryMessage(query, QueryOptions.codec.decode(body, version));
}
}
public void encode(QueryMessage msg, ChannelBuffer dest, int version)
{
CBUtil.writeLongString(msg.query, dest);
if (version == 1)
CBUtil.writeConsistencyLevel(msg.options.getConsistency(), dest);
else
QueryOptions.codec.encode(msg.options, dest, version);
}
public int encodedSize(QueryMessage msg, int version)
{
int size = CBUtil.sizeOfLongString(msg.query);
if (version == 1)
{
size += CBUtil.sizeOfConsistencyLevel(msg.options.getConsistency());
}
else
{
size += QueryOptions.codec.encodedSize(msg.options, version);
}
return size;
}
};
public final String query;
public final QueryOptions options;
public QueryMessage(String query, ConsistencyLevel consistency)
{
this(query, new QueryOptions(consistency, Collections.<ByteBuffer>emptyList()));
}
public QueryMessage(String query, QueryOptions options)
{
super(Type.QUERY);
this.query = query;
this.options = options;
}
public Message.Response execute(QueryState state)
{
try
{
if (options.getPageSize() == 0)
throw new ProtocolException("The page size cannot be 0");
UUID tracingId = null;
if (isTracingRequested())
{
tracingId = UUIDGen.getTimeUUID();
state.prepareTracingSession(tracingId);
}
if (state.traceNextQuery())
{
state.createTracingSession();
ImmutableMap.Builder<String, String> builder = ImmutableMap.builder();
builder.put("query", query);
if (options.getPageSize() > 0)
builder.put("page_size", Integer.toString(options.getPageSize()));
Tracing.instance.begin("Execute CQL3 query", builder.build());
}
Message.Response response = QueryProcessor.process(query, state, options);
if (options.skipMetadata() && response instanceof ResultMessage.Rows)
((ResultMessage.Rows)response).result.metadata.setSkipMetadata();
if (tracingId != null)
response.setTracingId(tracingId);
return response;
}
catch (Exception e)
{
if (!((e instanceof RequestValidationException) || (e instanceof RequestExecutionException)))
logger.error("Unexpected error during query", e);
return ErrorMessage.fromException(e);
}
finally
{
Tracing.instance.stopSession();
}
}
@Override
public String toString()
{
return "QUERY " + query;
}
}