/*
* 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.server.response;
import java.nio.ByteBuffer;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import org.apache.log4j.Logger;
import com.alibaba.cobar.CobarCluster;
import com.alibaba.cobar.CobarConfig;
import com.alibaba.cobar.CobarNode;
import com.alibaba.cobar.CobarServer;
import com.alibaba.cobar.config.Alarms;
import com.alibaba.cobar.config.Fields;
import com.alibaba.cobar.config.model.CobarNodeConfig;
import com.alibaba.cobar.config.model.SchemaConfig;
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.server.ServerConnection;
import com.alibaba.cobar.util.IntegerUtil;
import com.alibaba.cobar.util.StringUtil;
/**
* @author xianmao.hexm
*/
public class ShowCobarCluster {
private static final Logger alarm = Logger.getLogger("alarm");
private static final int FIELD_COUNT = 2;
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("HOST", Fields.FIELD_TYPE_VAR_STRING);
fields[i++].packetId = ++packetId;
fields[i] = PacketUtil.getField("WEIGHT", Fields.FIELD_TYPE_LONG);
fields[i++].packetId = ++packetId;
eof.packetId = ++packetId;
}
public static void response(ServerConnection c) {
ByteBuffer buffer = c.allocate();
// write header
buffer = header.write(buffer, c);
// write field
for (FieldPacket field : fields) {
buffer = field.write(buffer, c);
}
// write eof
buffer = eof.write(buffer, c);
// write rows
byte packetId = eof.packetId;
for (RowDataPacket row : getRows(c)) {
row.packetId = ++packetId;
buffer = row.write(buffer, c);
}
// last eof
EOFPacket lastEof = new EOFPacket();
lastEof.packetId = ++packetId;
buffer = lastEof.write(buffer, c);
// post write
c.write(buffer);
}
private static List<RowDataPacket> getRows(ServerConnection c) {
List<RowDataPacket> rows = new LinkedList<RowDataPacket>();
CobarConfig config = CobarServer.getInstance().getConfig();
CobarCluster cluster = config.getCluster();
Map<String, SchemaConfig> schemas = config.getSchemas();
SchemaConfig schema = (c.getSchema() == null) ? null : schemas.get(c.getSchema());
// 如果没有指定schema或者schema为null,则使用全部集群。
if (schema == null) {
Map<String, CobarNode> nodes = cluster.getNodes();
for (CobarNode n : nodes.values()) {
if (n != null && n.isOnline()) {
rows.add(getRow(n, c.getCharset()));
}
}
} else {
String group = (schema.getGroup() == null) ? "default" : schema.getGroup();
List<String> nodeList = cluster.getGroups().get(group);
if (nodeList != null && nodeList.size() > 0) {
Map<String, CobarNode> nodes = cluster.getNodes();
for (String id : nodeList) {
CobarNode n = nodes.get(id);
if (n != null && n.isOnline()) {
rows.add(getRow(n, c.getCharset()));
}
}
}
// 如果schema对应的group或者默认group都没有有效的节点,则使用全部集群。
if (rows.size() == 0) {
Map<String, CobarNode> nodes = cluster.getNodes();
for (CobarNode n : nodes.values()) {
if (n != null && n.isOnline()) {
rows.add(getRow(n, c.getCharset()));
}
}
}
}
if (rows.size() == 0) {
alarm.error(Alarms.CLUSTER_EMPTY + c.toString());
}
return rows;
}
private static RowDataPacket getRow(CobarNode node, String charset) {
CobarNodeConfig conf = node.getConfig();
RowDataPacket row = new RowDataPacket(FIELD_COUNT);
row.add(StringUtil.encode(conf.getHost(), charset));
row.add(IntegerUtil.toBytes(conf.getWeight()));
return row;
}
}