/*
* 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.List;
import java.util.UUID;
import com.google.common.collect.ImmutableMap;
import io.netty.buffer.ByteBuf;
import org.apache.cassandra.cql3.CQLStatement;
import org.apache.cassandra.cql3.QueryHandler;
import org.apache.cassandra.cql3.QueryOptions;
import org.apache.cassandra.cql3.statements.ParsedStatement;
import org.apache.cassandra.db.ConsistencyLevel;
import org.apache.cassandra.exceptions.PreparedQueryNotFoundException;
import org.apache.cassandra.service.QueryState;
import org.apache.cassandra.tracing.Tracing;
import org.apache.cassandra.transport.*;
import org.apache.cassandra.utils.MD5Digest;
import org.apache.cassandra.utils.UUIDGen;
public class ExecuteMessage extends Message.Request
{
public static final Message.Codec<ExecuteMessage> codec = new Message.Codec<ExecuteMessage>()
{
public ExecuteMessage decode(ByteBuf body, int version)
{
byte[] id = CBUtil.readBytes(body);
if (version == 1)
{
List<ByteBuffer> values = CBUtil.readValueList(body);
ConsistencyLevel consistency = CBUtil.readConsistencyLevel(body);
return new ExecuteMessage(MD5Digest.wrap(id), QueryOptions.fromProtocolV1(consistency, values));
}
else
{
return new ExecuteMessage(MD5Digest.wrap(id), QueryOptions.codec.decode(body, version));
}
}
public void encode(ExecuteMessage msg, ByteBuf dest, int version)
{
CBUtil.writeBytes(msg.statementId.bytes, dest);
if (version == 1)
{
CBUtil.writeValueList(msg.options.getValues(), dest);
CBUtil.writeConsistencyLevel(msg.options.getConsistency(), dest);
}
else
{
QueryOptions.codec.encode(msg.options, dest, version);
}
}
public int encodedSize(ExecuteMessage msg, int version)
{
int size = 0;
size += CBUtil.sizeOfBytes(msg.statementId.bytes);
if (version == 1)
{
size += CBUtil.sizeOfValueList(msg.options.getValues());
size += CBUtil.sizeOfConsistencyLevel(msg.options.getConsistency());
}
else
{
size += QueryOptions.codec.encodedSize(msg.options, version);
}
return size;
}
};
public final MD5Digest statementId;
public final QueryOptions options;
public ExecuteMessage(MD5Digest statementId, QueryOptions options)
{
super(Message.Type.EXECUTE);
this.statementId = statementId;
this.options = options;
}
public Message.Response execute(QueryState state)
{
try
{
QueryHandler handler = state.getClientState().getCQLQueryHandler();
ParsedStatement.Prepared prepared = handler.getPrepared(statementId);
if (prepared == null)
throw new PreparedQueryNotFoundException(statementId);
options.prepare(prepared.boundNames);
CQLStatement statement = prepared.statement;
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();
if (options.getPageSize() > 0)
builder.put("page_size", Integer.toString(options.getPageSize()));
// TODO we don't have [typed] access to CQL bind variables here. CASSANDRA-4560 is open to add support.
Tracing.instance.begin("Execute CQL3 prepared query", builder.build());
}
Message.Response response = handler.processPrepared(statement, 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)
{
return ErrorMessage.fromException(e);
}
finally
{
Tracing.instance.stopSession();
}
}
@Override
public String toString()
{
return "EXECUTE " + statementId + " with " + options.getValues().size() + " values at consistency " + options.getConsistency();
}
}