ShowDataSource.java

/*
 * Copyright 2012-2015 org.opencloudb.
 *  
 * 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 org.opencloudb.response;

import java.nio.ByteBuffer;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import org.opencloudb.MycatConfig;
import org.opencloudb.MycatServer;
import org.opencloudb.backend.PhysicalDBNode;
import org.opencloudb.backend.PhysicalDBPool;
import org.opencloudb.backend.PhysicalDatasource;
import org.opencloudb.config.Fields;
import org.opencloudb.manager.ManagerConnection;
import org.opencloudb.mysql.PacketUtil;
import org.opencloudb.net.mysql.EOFPacket;
import org.opencloudb.net.mysql.FieldPacket;
import org.opencloudb.net.mysql.ResultSetHeaderPacket;
import org.opencloudb.net.mysql.RowDataPacket;
import org.opencloudb.util.IntegerUtil;
import org.opencloudb.util.LongUtil;
import org.opencloudb.util.StringUtil;

/**
 * 查看数据源信息
 * 
 * @author mycat
 * @author mycat
 */
public final class ShowDataSource {

	private static final int FIELD_COUNT = 9;
	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("W/R", Fields.FIELD_TYPE_VAR_STRING);
		fields[i++].packetId = ++packetId;

		fields[i] = PacketUtil.getField("ACTIVE", Fields.FIELD_TYPE_LONG);
		fields[i++].packetId = ++packetId;

		fields[i] = PacketUtil.getField("IDLE", Fields.FIELD_TYPE_LONG);
		fields[i++].packetId = ++packetId;

		fields[i] = PacketUtil.getField("SIZE", Fields.FIELD_TYPE_LONG);
		fields[i++].packetId = ++packetId;

		fields[i] = PacketUtil.getField("EXECUTE", Fields.FIELD_TYPE_LONGLONG);
		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;
		MycatConfig conf = MycatServer.getInstance().getConfig();
		Map<String, PhysicalDBPool> dataHosts = conf.getDataHosts();
		List<PhysicalDatasource> dataSources = new LinkedList<PhysicalDatasource>();
		if (null != name) {
			PhysicalDBNode dn = conf.getDataNodes().get(name);
			if (dn != null) {
				dataSources.addAll(dn.getDbPool().getAllDataSources());
			}
		} else {
			// add all
			for (PhysicalDBPool pool : dataHosts.values()) {
				dataSources.addAll(pool.getAllDataSources());
			}
		}

		for (PhysicalDatasource ds : dataSources) {
			RowDataPacket row = getRow(ds, 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(PhysicalDatasource ds, String charset) {
		RowDataPacket row = new RowDataPacket(FIELD_COUNT);
		row.add(StringUtil.encode(ds.getName(), charset));
		row.add(StringUtil.encode(ds.getConfig().getDbType(), charset));
		row.add(StringUtil.encode(ds.getConfig().getIp(), charset));
		row.add(IntegerUtil.toBytes(ds.getConfig().getPort()));
		row.add(StringUtil.encode(ds.isReadNode() ? "R" : "W", charset));
		row.add(IntegerUtil.toBytes(ds.getActiveCount()));
		row.add(IntegerUtil.toBytes(ds.getIdleCount()));
		row.add(IntegerUtil.toBytes(ds.getSize()));
		row.add(LongUtil.toBytes(ds.getExecuteCount()));
		return row;
	}

}