/*
* 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.List;
import org.jboss.netty.buffer.ChannelBuffer;
import org.apache.cassandra.cql3.CQLStatement;
import org.apache.cassandra.cql3.QueryProcessor;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.transport.*;
public class ExecuteMessage extends Message.Request
{
public static final Message.Codec<ExecuteMessage> codec = new Message.Codec<ExecuteMessage>()
{
public ExecuteMessage decode(ChannelBuffer body)
{
int id = body.readInt();
int count = body.readUnsignedShort();
List<ByteBuffer> values = new ArrayList<ByteBuffer>(count);
for (int i = 0; i < count; i++)
values.add(CBUtil.readValue(body));
return new ExecuteMessage(id, values);
}
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(2, 0, vs);
builder.add(CBUtil.intToCB(msg.statementId));
builder.add(CBUtil.shortToCB(vs));
// Values
for (ByteBuffer value : msg.values)
builder.addValue(value);
return builder.build();
}
};
public final int statementId;
public final List<ByteBuffer> values;
public ExecuteMessage(int statementId, List<ByteBuffer> values)
{
super(Message.Type.EXECUTE);
this.statementId = statementId;
this.values = values;
}
public ChannelBuffer encode()
{
return codec.encode(this);
}
public Message.Response execute()
{
try
{
ServerConnection c = (ServerConnection)connection;
CQLStatement statement = c.clientState().getCQL3Prepared().get(statementId);
if (statement == null)
throw new InvalidRequestException(String.format("Prepared query with ID %d not found", statementId));
return QueryProcessor.processPrepared(statement, c.clientState(), values);
}
catch (Exception e)
{
return ErrorMessage.fromException(e);
}
}
@Override
public String toString()
{
return "EXECUTE " + statementId + " with " + values.size() + " values";
}
}