| /* |
| * 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.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| import io.netty.buffer.ByteBuf; |
| |
| import org.apache.cassandra.cql3.QueryProcessor; |
| import org.apache.cassandra.service.QueryState; |
| import org.apache.cassandra.transport.FrameCompressor; |
| import org.apache.cassandra.transport.Message; |
| import org.apache.cassandra.transport.ProtocolVersion; |
| |
| /** |
| * Message to indicate that the server is ready to receive requests. |
| */ |
| public class OptionsMessage extends Message.Request |
| { |
| public static final Message.Codec<OptionsMessage> codec = new Message.Codec<OptionsMessage>() |
| { |
| public OptionsMessage decode(ByteBuf body, ProtocolVersion version) |
| { |
| return new OptionsMessage(); |
| } |
| |
| public void encode(OptionsMessage msg, ByteBuf dest, ProtocolVersion version) |
| { |
| } |
| |
| public int encodedSize(OptionsMessage msg, ProtocolVersion version) |
| { |
| return 0; |
| } |
| }; |
| |
| public OptionsMessage() |
| { |
| super(Message.Type.OPTIONS); |
| } |
| |
| public Message.Response execute(QueryState state, long queryStartNanoTime) |
| { |
| List<String> cqlVersions = new ArrayList<String>(); |
| cqlVersions.add(QueryProcessor.CQL_VERSION.toString()); |
| |
| List<String> compressions = new ArrayList<String>(); |
| if (FrameCompressor.SnappyCompressor.instance != null) |
| compressions.add("snappy"); |
| // LZ4 is always available since worst case scenario it default to a pure JAVA implem. |
| compressions.add("lz4"); |
| |
| Map<String, List<String>> supported = new HashMap<String, List<String>>(); |
| supported.put(StartupMessage.CQL_VERSION, cqlVersions); |
| supported.put(StartupMessage.COMPRESSION, compressions); |
| supported.put(StartupMessage.PROTOCOL_VERSIONS, ProtocolVersion.supportedVersions()); |
| |
| return new SupportedMessage(supported); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return "OPTIONS"; |
| } |
| } |