/* * Copyright 1999-2012 Alibaba Group. * * Licensed 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 com.alibaba.cobar.manager.response; import java.nio.ByteBuffer; import com.alibaba.cobar.config.Fields; import com.alibaba.cobar.config.Versions; import com.alibaba.cobar.manager.ManagerConnection; import com.alibaba.cobar.mysql.PacketUtil; import com.alibaba.cobar.net.mysql.EOFPacket; import com.alibaba.cobar.net.mysql.FieldPacket; import com.alibaba.cobar.net.mysql.ResultSetHeaderPacket; import com.alibaba.cobar.net.mysql.RowDataPacket; /** * 查看CobarServer版本 * * @author wenfeng.cenwf 2011-4-19 */ public final class ShowVersion { private static final int FIELD_COUNT = 1; private static final ResultSetHeaderPacket header = PacketUtil.getHeader(FIELD_COUNT); private static final FieldPacket[] fields = new FieldPacket[FIELD_COUNT]; private static final EOFPacket eof = new EOFPacket(); static { int i = 0; byte packetId = 0; header.packetId = ++packetId; fields[i] = PacketUtil.getField("VERSION", Fields.FIELD_TYPE_STRING); fields[i++].packetId = ++packetId; eof.packetId = ++packetId; } public static void execute(ManagerConnection c) { ByteBuffer buffer = c.allocate(); // write header buffer = header.write(buffer, c); // write fields for (FieldPacket field : fields) { buffer = field.write(buffer, c); } // write eof buffer = eof.write(buffer, c); // write rows byte packetId = eof.packetId; RowDataPacket row = new RowDataPacket(FIELD_COUNT); row.add(Versions.SERVER_VERSION); row.packetId = ++packetId; buffer = row.write(buffer, c); // write last eof EOFPacket lastEof = new EOFPacket(); lastEof.packetId = ++packetId; buffer = lastEof.write(buffer, c); // write buffer c.write(buffer); } }