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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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 com.google.common.annotations.VisibleForTesting;
import io.netty.buffer.ByteBuf;
import org.apache.cassandra.cql3.ResultSet;
import org.apache.cassandra.transport.*;
import org.apache.cassandra.utils.MD5Digest;
public abstract class ResultMessage extends Message.Response
{
public static final Message.Codec codec = new Message.Codec()
{
public ResultMessage decode(ByteBuf body, ProtocolVersion version)
{
Kind kind = Kind.fromId(body.readInt());
return kind.subcodec.decode(body, version);
}
public void encode(ResultMessage msg, ByteBuf dest, ProtocolVersion version)
{
dest.writeInt(msg.kind.id);
msg.kind.subcodec.encode(msg, dest, version);
}
public int encodedSize(ResultMessage msg, ProtocolVersion version)
{
return 4 + msg.kind.subcodec.encodedSize(msg, version);
}
};
public enum Kind
{
VOID (1, Void.subcodec),
ROWS (2, Rows.subcodec),
SET_KEYSPACE (3, SetKeyspace.subcodec),
PREPARED (4, Prepared.subcodec),
SCHEMA_CHANGE (5, SchemaChange.subcodec);
public final int id;
public final Message.Codec subcodec;
private static final Kind[] ids;
static
{
int maxId = -1;
for (Kind k : Kind.values())
maxId = Math.max(maxId, k.id);
ids = new Kind[maxId + 1];
for (Kind k : Kind.values())
{
if (ids[k.id] != null)
throw new IllegalStateException("Duplicate kind id");
ids[k.id] = k;
}
}
private Kind(int id, Message.Codec subcodec)
{
this.id = id;
this.subcodec = subcodec;
}
public static Kind fromId(int id)
{
Kind k = ids[id];
if (k == null)
throw new ProtocolException(String.format("Unknown kind id %d in RESULT message", id));
return k;
}
}
public final Kind kind;
protected ResultMessage(Kind kind)
{
super(Message.Type.RESULT);
this.kind = kind;
}
public static class Void extends ResultMessage
{
// Even though we have no specific information here, don't make a
// singleton since as each message it has in fact a streamid and connection.
public Void()
{
super(Kind.VOID);
}
public static final Message.Codec subcodec = new Message.Codec()
{
public ResultMessage decode(ByteBuf body, ProtocolVersion version)
{
return new Void();
}
public void encode(ResultMessage msg, ByteBuf dest, ProtocolVersion version)
{
assert msg instanceof Void;
}
public int encodedSize(ResultMessage msg, ProtocolVersion version)
{
return 0;
}
};
@Override
public String toString()
{
return "EMPTY RESULT";
}
}
public static class SetKeyspace extends ResultMessage
{
public final String keyspace;
public SetKeyspace(String keyspace)
{
super(Kind.SET_KEYSPACE);
this.keyspace = keyspace;
}
public static final Message.Codec subcodec = new Message.Codec()
{
public ResultMessage decode(ByteBuf body, ProtocolVersion version)
{
String keyspace = CBUtil.readString(body);
return new SetKeyspace(keyspace);
}
public void encode(ResultMessage msg, ByteBuf dest, ProtocolVersion version)
{
assert msg instanceof SetKeyspace;
CBUtil.writeAsciiString(((SetKeyspace)msg).keyspace, dest);
}
public int encodedSize(ResultMessage msg, ProtocolVersion version)
{
assert msg instanceof SetKeyspace;
return CBUtil.sizeOfAsciiString(((SetKeyspace)msg).keyspace);
}
};
@Override
public String toString()
{
return "RESULT set keyspace " + keyspace;
}
}
public static class Rows extends ResultMessage
{
public static final Message.Codec subcodec = new Message.Codec()
{
public ResultMessage decode(ByteBuf body, ProtocolVersion version)
{
return new Rows(ResultSet.codec.decode(body, version));
}
public void encode(ResultMessage msg, ByteBuf dest, ProtocolVersion version)
{
assert msg instanceof Rows;
Rows rowMsg = (Rows)msg;
ResultSet.codec.encode(rowMsg.result, dest, version);
}
public int encodedSize(ResultMessage msg, ProtocolVersion version)
{
assert msg instanceof Rows;
Rows rowMsg = (Rows)msg;
return ResultSet.codec.encodedSize(rowMsg.result, version);
}
};
public final ResultSet result;
public Rows(ResultSet result)
{
super(Kind.ROWS);
this.result = result;
}
@Override
public String toString()
{
return "ROWS " + result;
}
}
public static class Prepared extends ResultMessage
{
public static final Message.Codec subcodec = new Message.Codec()
{
public ResultMessage decode(ByteBuf body, ProtocolVersion version)
{
MD5Digest id = MD5Digest.wrap(CBUtil.readBytes(body));
MD5Digest resultMetadataId = null;
if (version.isGreaterOrEqualTo(ProtocolVersion.V5))
resultMetadataId = MD5Digest.wrap(CBUtil.readBytes(body));
ResultSet.PreparedMetadata metadata = ResultSet.PreparedMetadata.codec.decode(body, version);
ResultSet.ResultMetadata resultMetadata = ResultSet.ResultMetadata.EMPTY;
if (version.isGreaterThan(ProtocolVersion.V1))
resultMetadata = ResultSet.ResultMetadata.codec.decode(body, version);
return new Prepared(id, resultMetadataId, metadata, resultMetadata);
}
public void encode(ResultMessage msg, ByteBuf dest, ProtocolVersion version)
{
assert msg instanceof Prepared;
Prepared prepared = (Prepared)msg;
assert prepared.statementId != null;
CBUtil.writeBytes(prepared.statementId.bytes, dest);
if (version.isGreaterOrEqualTo(ProtocolVersion.V5))
CBUtil.writeBytes(prepared.resultMetadataId.bytes, dest);
ResultSet.PreparedMetadata.codec.encode(prepared.metadata, dest, version);
if (version.isGreaterThan(ProtocolVersion.V1))
ResultSet.ResultMetadata.codec.encode(prepared.resultMetadata, dest, version);
}
public int encodedSize(ResultMessage msg, ProtocolVersion version)
{
assert msg instanceof Prepared;
Prepared prepared = (Prepared)msg;
assert prepared.statementId != null;
int size = 0;
size += CBUtil.sizeOfBytes(prepared.statementId.bytes);
if (version.isGreaterOrEqualTo(ProtocolVersion.V5))
size += CBUtil.sizeOfBytes(prepared.resultMetadataId.bytes);
size += ResultSet.PreparedMetadata.codec.encodedSize(prepared.metadata, version);
if (version.isGreaterThan(ProtocolVersion.V1))
size += ResultSet.ResultMetadata.codec.encodedSize(prepared.resultMetadata, version);
return size;
}
};
public final MD5Digest statementId;
public final MD5Digest resultMetadataId;
/** Describes the variables to be bound in the prepared statement */
public final ResultSet.PreparedMetadata metadata;
/** Describes the results of executing this prepared statement */
public final ResultSet.ResultMetadata resultMetadata;
public Prepared(MD5Digest statementId, MD5Digest resultMetadataId, ResultSet.PreparedMetadata metadata, ResultSet.ResultMetadata resultMetadata)
{
super(Kind.PREPARED);
this.statementId = statementId;
this.resultMetadataId = resultMetadataId;
this.metadata = metadata;
this.resultMetadata = resultMetadata;
}
@VisibleForTesting
public Prepared withResultMetadata(ResultSet.ResultMetadata resultMetadata)
{
return new Prepared(statementId, resultMetadata.getResultMetadataId(), metadata, resultMetadata);
}
@Override
public String toString()
{
return "RESULT PREPARED " + statementId + " " + metadata + " (resultMetadata=" + resultMetadata + ")";
}
}
public static class SchemaChange extends ResultMessage
{
public final Event.SchemaChange change;
public SchemaChange(Event.SchemaChange change)
{
super(Kind.SCHEMA_CHANGE);
this.change = change;
}
public static final Message.Codec subcodec = new Message.Codec()
{
public ResultMessage decode(ByteBuf body, ProtocolVersion version)
{
return new SchemaChange(Event.SchemaChange.deserializeEvent(body, version));
}
public void encode(ResultMessage msg, ByteBuf dest, ProtocolVersion version)
{
assert msg instanceof SchemaChange;
SchemaChange scm = (SchemaChange)msg;
scm.change.serializeEvent(dest, version);
}
public int encodedSize(ResultMessage msg, ProtocolVersion version)
{
assert msg instanceof SchemaChange;
SchemaChange scm = (SchemaChange)msg;
return scm.change.eventSerializedSize(version);
}
};
@Override
public String toString()
{
return "RESULT schema change " + change;
}
}
}