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* 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.Attributes;
import org.apache.cassandra.cql3.CQLStatement;
import org.apache.cassandra.cql3.QueryProcessor;
import org.apache.cassandra.cql3.statements.BatchStatement;
import org.apache.cassandra.cql3.statements.ModificationStatement;
import org.apache.cassandra.db.ConsistencyLevel;
import org.apache.cassandra.exceptions.InvalidRequestException;
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 BatchMessage extends Message.Request
{
public static final Message.Codec<BatchMessage> codec = new Message.Codec<BatchMessage>()
{
public BatchMessage decode(ChannelBuffer body, int version)
{
if (version == 1)
throw new ProtocolException("BATCH messages are not support in version 1 of the protocol");
byte type = body.readByte();
int n = body.readUnsignedShort();
List<Object> queryOrIds = new ArrayList<Object>(n);
List<List<ByteBuffer>> variables = new ArrayList<List<ByteBuffer>>(n);
for (int i = 0; i < n; i++)
{
byte kind = body.readByte();
if (kind == 0)
queryOrIds.add(CBUtil.readLongString(body));
else if (kind == 1)
queryOrIds.add(MD5Digest.wrap(CBUtil.readBytes(body)));
else
throw new ProtocolException("Invalid query kind in BATCH messages. Must be 0 or 1 but got " + kind);
variables.add(CBUtil.readValueList(body));
}
ConsistencyLevel consistency = CBUtil.readConsistencyLevel(body);
return new BatchMessage(toType(type), queryOrIds, variables, consistency);
}
public void encode(BatchMessage msg, ChannelBuffer dest, int version)
{
int queries = msg.queryOrIdList.size();
dest.writeByte(fromType(msg.type));
dest.writeShort(queries);
for (int i = 0; i < queries; i++)
{
Object q = msg.queryOrIdList.get(i);
dest.writeByte((byte)(q instanceof String ? 0 : 1));
if (q instanceof String)
CBUtil.writeLongString((String)q, dest);
else
CBUtil.writeBytes(((MD5Digest)q).bytes, dest);
CBUtil.writeValueList(msg.values.get(i), dest);
}
CBUtil.writeConsistencyLevel(msg.consistency, dest);
}
public int encodedSize(BatchMessage msg, int version)
{
int size = 3; // type + nb queries
for (int i = 0; i < msg.queryOrIdList.size(); i++)
{
Object q = msg.queryOrIdList.get(i);
size += 1 + (q instanceof String
? CBUtil.sizeOfLongString((String)q)
: CBUtil.sizeOfBytes(((MD5Digest)q).bytes));
size += CBUtil.sizeOfValueList(msg.values.get(i));
}
size += CBUtil.sizeOfConsistencyLevel(msg.consistency);
return size;
}
private BatchStatement.Type toType(byte b)
{
if (b == 0)
return BatchStatement.Type.LOGGED;
else if (b == 1)
return BatchStatement.Type.UNLOGGED;
else if (b == 2)
return BatchStatement.Type.COUNTER;
else
throw new ProtocolException("Invalid BATCH message type " + b);
}
private byte fromType(BatchStatement.Type type)
{
switch (type)
{
case LOGGED: return 0;
case UNLOGGED: return 1;
case COUNTER: return 2;
default:
throw new AssertionError();
}
}
};
public final BatchStatement.Type type;
public final List<Object> queryOrIdList;
public final List<List<ByteBuffer>> values;
public final ConsistencyLevel consistency;
public BatchMessage(BatchStatement.Type type, List<Object> queryOrIdList, List<List<ByteBuffer>> values, ConsistencyLevel consistency)
{
super(Message.Type.BATCH);
this.type = type;
this.queryOrIdList = queryOrIdList;
this.values = values;
this.consistency = consistency;
}
public Message.Response execute(QueryState state)
{
try
{
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 batch of CQL3 queries", Collections.<String, String>emptyMap());
}
List<ModificationStatement> statements = new ArrayList<ModificationStatement>(queryOrIdList.size());
for (int i = 0; i < queryOrIdList.size(); i++)
{
Object query = queryOrIdList.get(i);
CQLStatement statement;
if (query instanceof String)
{
statement = QueryProcessor.parseStatement((String)query, state);
}
else
{
statement = QueryProcessor.getPrepared((MD5Digest)query);
if (statement == null)
throw new PreparedQueryNotFoundException((MD5Digest)query);
}
List<ByteBuffer> queryValues = values.get(i);
if (queryValues.size() != statement.getBoundTerms())
throw new InvalidRequestException(String.format("There were %d markers(?) in CQL but %d bound variables",
statement.getBoundTerms(),
queryValues.size()));
if (!(statement instanceof ModificationStatement))
throw new InvalidRequestException("Invalid statement in batch: only UPDATE, INSERT and DELETE statements are allowed.");
ModificationStatement mst = (ModificationStatement)statement;
if (mst.isCounter())
{
if (type != BatchStatement.Type.COUNTER)
throw new InvalidRequestException("Cannot include counter statement in a non-counter batch");
}
else
{
if (type == BatchStatement.Type.COUNTER)
throw new InvalidRequestException("Cannot include non-counter statement in a counter batch");
}
statements.add(mst);
}
// Note: It's ok at this point to pass a bogus value for the number of bound terms in the BatchState ctor
// (and no value would be really correct, so we prefer passing a clearly wrong one).
BatchStatement batch = new BatchStatement(-1, type, statements, Attributes.none());
Message.Response response = QueryProcessor.processBatch(batch, consistency, state, values, queryOrIdList);
if (tracingId != null)
response.setTracingId(tracingId);
return response;
}
catch (Exception e)
{
return ErrorMessage.fromException(e);
}
finally
{
Tracing.instance.stopSession();
}
}
@Override
public String toString()
{
StringBuilder sb = new StringBuilder();
sb.append("BATCH of [");
for (int i = 0; i < queryOrIdList.size(); i++)
{
if (i > 0) sb.append(", ");
sb.append(queryOrIdList.get(i)).append(" with ").append(values.get(i).size()).append(" values");
}
sb.append("] at consistency ").append(consistency);
return sb.toString();
}
}