/*
* 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 java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import com.alibaba.cobar.CobarConfig;
import com.alibaba.cobar.CobarServer;
import com.alibaba.cobar.config.Fields;
import com.alibaba.cobar.config.model.DataSourceConfig;
import com.alibaba.cobar.manager.ManagerConnection;
import com.alibaba.cobar.mysql.MySQLDataNode;
import com.alibaba.cobar.mysql.MySQLDataSource;
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;
import com.alibaba.cobar.parser.util.Pair;
import com.alibaba.cobar.parser.util.PairUtil;
import com.alibaba.cobar.util.IntegerUtil;
import com.alibaba.cobar.util.StringUtil;
/**
* 查看数据源信息
*
* @author xianmao.hexm 2010-9-26 下午04:56:26
* @author wenfeng.cenwf 2011-4-25
*/
public final class ShowDataSource {
private static final int FIELD_COUNT = 5;
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("NAME", Fields.FIELD_TYPE_VAR_STRING);
fields[i++].packetId = ++packetId;
fields[i] = PacketUtil.getField("TYPE", Fields.FIELD_TYPE_VAR_STRING);
fields[i++].packetId = ++packetId;
fields[i] = PacketUtil.getField("HOST", Fields.FIELD_TYPE_VAR_STRING);
fields[i++].packetId = ++packetId;
fields[i] = PacketUtil.getField("PORT", Fields.FIELD_TYPE_LONG);
fields[i++].packetId = ++packetId;
fields[i] = PacketUtil.getField("SCHEMA", Fields.FIELD_TYPE_VAR_STRING);
fields[i++].packetId = ++packetId;
eof.packetId = ++packetId;
}
public static void execute(ManagerConnection c, String name) {
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;
CobarConfig conf = CobarServer.getInstance().getConfig();
Map<String, DataSourceConfig> dataSources = conf.getDataSources();
List<String> keys = new ArrayList<String>();
if (null != name) {
MySQLDataNode dn = conf.getDataNodes().get(name);
if (dn != null)
for (MySQLDataSource ds : dn.getSources()) {
if (ds != null) {
keys.add(ds.getName());
}
}
} else {
keys.addAll(dataSources.keySet());
}
Collections.sort(keys, new Comparators<String>());
for (String key : keys) {
RowDataPacket row = getRow(dataSources.get(key), c.getCharset());
row.packetId = ++packetId;
buffer = row.write(buffer, c);
}
// write last eof
EOFPacket lastEof = new EOFPacket();
lastEof.packetId = ++packetId;
buffer = lastEof.write(buffer, c);
// post write
c.write(buffer);
}
private static RowDataPacket getRow(DataSourceConfig dsc, String charset) {
RowDataPacket row = new RowDataPacket(FIELD_COUNT);
row.add(StringUtil.encode(dsc.getName(), charset));
row.add(StringUtil.encode(dsc.getType(), charset));
row.add(StringUtil.encode(dsc.getHost(), charset));
row.add(IntegerUtil.toBytes(dsc.getPort()));
row.add(StringUtil.encode(dsc.getDatabase(), charset));
return row;
}
private static final class Comparators<T> implements Comparator<String> {
@Override
public int compare(String s1, String s2) {
Pair<String, Integer> p1 = PairUtil.splitIndex(s1, '[', ']');
Pair<String, Integer> p2 = PairUtil.splitIndex(s2, '[', ']');
if (p1.getKey().compareTo(p2.getKey()) == 0) {
return p1.getValue() - p2.getValue();
} else {
return p1.getKey().compareTo(p2.getKey());
}
}
}
}