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* 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.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.UUID;
import org.jboss.netty.buffer.ChannelBuffer;
import org.apache.cassandra.cql3.CQLStatement;
import org.apache.cassandra.cql3.QueryProcessor;
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.FBUtilities;
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(ChannelBuffer body)
{
byte[] id = CBUtil.readBytes(body);
int count = body.readUnsignedShort();
List<ByteBuffer> values = new ArrayList<ByteBuffer>(count);
for (int i = 0; i < count; i++)
values.add(CBUtil.readValue(body));
ConsistencyLevel consistency = CBUtil.readConsistencyLevel(body);
return new ExecuteMessage(id, values, consistency);
}
public ChannelBuffer encode(ExecuteMessage msg)
{
// We have:
// - statementId
// - Number of values
// - The values
// - options
int vs = msg.values.size();
CBUtil.BufferBuilder builder = new CBUtil.BufferBuilder(3, 0, vs);
builder.add(CBUtil.bytesToCB(msg.statementId.bytes));
builder.add(CBUtil.shortToCB(vs));
// Values
for (ByteBuffer value : msg.values)
builder.addValue(value);
builder.add(CBUtil.consistencyLevelToCB(msg.consistency));
return builder.build();
}
};
public final MD5Digest statementId;
public final List<ByteBuffer> values;
public final ConsistencyLevel consistency;
public ExecuteMessage(byte[] statementId, List<ByteBuffer> values, ConsistencyLevel consistency)
{
this(MD5Digest.wrap(statementId), values, consistency);
}
public ExecuteMessage(MD5Digest statementId, List<ByteBuffer> values, ConsistencyLevel consistency)
{
super(Message.Type.EXECUTE);
this.statementId = statementId;
this.values = values;
this.consistency = consistency;
}
public ChannelBuffer encode()
{
return codec.encode(this);
}
public Message.Response execute(QueryState state)
{
try
{
CQLStatement statement = QueryProcessor.getPrepared(statementId);
if (statement == null)
throw new PreparedQueryNotFoundException(statementId);
UUID tracingId = null;
if (isTracingRequested())
{
tracingId = UUIDGen.getTimeUUID();
state.prepareTracingSession(tracingId);
}
if (state.traceNextQuery())
{
state.createTracingSession();
// 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", Collections.<String, String>emptyMap());
}
Message.Response response = QueryProcessor.processPrepared(statement, consistency, state, values);
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 " + values.size() + " values at consistency " + consistency;
}
}