/*
* Copyright (c) 2013, OpenCloudDB/MyCAT and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software;Designed and Developed mainly by many Chinese
* opensource volunteers. you can redistribute it and/or modify it under the
* terms of the GNU General Public License version 2 only, as published by the
* Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Any questions about this component can be directed to it's project Web address
* https://code.google.com/p/opencloudb/.
*
*/
package org.opencloudb.mysql.nio.handler;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.locks.ReentrantLock;
import org.apache.log4j.Logger;
import org.opencloudb.MycatConfig;
import org.opencloudb.MycatServer;
import org.opencloudb.backend.BackendConnection;
import org.opencloudb.backend.ConnectionMeta;
import org.opencloudb.backend.PhysicalDBNode;
import org.opencloudb.cache.LayerCachePool;
import org.opencloudb.mpp.ColMeta;
import org.opencloudb.mpp.DataMergeService;
import org.opencloudb.net.mysql.ErrorPacket;
import org.opencloudb.net.mysql.FieldPacket;
import org.opencloudb.net.mysql.OkPacket;
import org.opencloudb.net.mysql.RowDataPacket;
import org.opencloudb.route.RouteResultset;
import org.opencloudb.route.RouteResultsetNode;
import org.opencloudb.server.NonBlockingSession;
import org.opencloudb.server.ServerConnection;
/**
* @author mycat
*/
public class MultiNodeQueryHandler extends MultiNodeHandler {
private static final Logger LOGGER = Logger
.getLogger(MultiNodeQueryHandler.class);
private final RouteResultset rrs;
private final NonBlockingSession session;
// private final CommitNodeHandler icHandler;
private final DataMergeService dataMergeSvr;
private volatile boolean mergeOutputed;
private final boolean autocommit;
private String priamaryKeyTable = null;
private int primaryKeyIndex = -1;
private int fieldCount = 0;
private final ReentrantLock lock;
private long affectedRows;
private long insertId;
private boolean fieldsReturned;
public MultiNodeQueryHandler(RouteResultset rrs, boolean autocommit,
NonBlockingSession session, DataMergeService dataMergeSvr) {
super(session);
if (rrs.getNodes() == null) {
throw new IllegalArgumentException("routeNode is null!");
}
this.rrs = rrs;
this.autocommit = session.getSource().isAutocommit();
this.session = session;
this.lock = new ReentrantLock();
// this.icHandler = new CommitNodeHandler(session);
this.dataMergeSvr = dataMergeSvr;
if (dataMergeSvr != null) {
LOGGER.debug("has data merge logic ");
}
}
public void execute() throws Exception {
ServerConnection sc = session.getSource();
final ReentrantLock lock = this.lock;
lock.lock();
try {
this.reset(rrs.getNodes().length);
this.fieldsReturned = false;
this.affectedRows = 0L;
this.insertId = 0L;
} finally {
lock.unlock();
}
MycatConfig conf = MycatServer.getInstance().getConfig();
for (final RouteResultsetNode node : rrs.getNodes()) {
final BackendConnection conn = session.getTarget(node);
if (session.tryExistsCon(conn, node, new Runnable() {
@Override
public void run() {
_execute(conn, node);
}
})) {
// to next node
continue;
}
// create new connection
PhysicalDBNode dn = conf.getDataNodes().get(node.getName());
ConnectionMeta conMeta = new ConnectionMeta(dn.getDatabase(),
sc.getCharset(), sc.getCharsetIndex(), autocommit);
dn.getConnection(conMeta, node, this, node);
}
}
/**
* lazy create ByteBuffer only when needed
*
* @return
*/
private ByteBuffer allocBuffer() {
if (buffer == null) {
buffer = session.getSource().allocate();
}
return buffer;
}
private void _execute(BackendConnection conn, RouteResultsetNode node) {
if (clearIfSessionClosed(session)) {
return;
}
conn.setResponseHandler(this);
conn.setRunning(true);
try {
conn.execute(node, session.getSource(), autocommit);
} catch (IOException e) {
connectionError(e, conn);
}
}
@Override
public void connectionAcquired(final BackendConnection conn) {
final RouteResultsetNode node = (RouteResultsetNode) conn
.getAttachment();
session.bindConnection(node, conn);
session.getSource().getProcessor().getExecutor()
.execute(new Runnable() {
@Override
public void run() {
_execute(conn, node);
}
});
}
@Override
public void errorResponse(byte[] data, BackendConnection conn) {
ErrorPacket err = new ErrorPacket();
err.read(data);
String errmsg = new String(err.message);
LOGGER.warn("error response from backend, code:" + err.errno
+ " errmsg: " + errmsg + ",from " + conn);
if (this.errorRepsponsed) {
return;
}
this.setFail(errmsg);
// try connection and finish conditon check
canClose(conn, true);
}
@Override
public void okResponse(byte[] data, BackendConnection conn) {
boolean executeResponse = conn.syncAndExcute();
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("received ok response ,executeResponse:"
+ executeResponse + " from " + conn);
}
if (executeResponse) {
if (clearIfSessionClosed(session)) {
return;
} else if (canClose(conn, false)) {
return;
}
ServerConnection source = session.getSource();
OkPacket ok = new OkPacket();
ok.read(data);
lock.lock();
try {
affectedRows += ok.affectedRows;
if (ok.insertId > 0) {
insertId = (insertId == 0) ? ok.insertId : Math.min(
insertId, ok.insertId);
}
} finally {
lock.unlock();
}
if (decrementCountBy(1)) {
if (this.autocommit) {// clear all connections
session.releaseConnections();
}
if (this.isFail() || session.closed()) {
tryErrorFinished(conn, true);
return;
}
lock.lock();
try {
ok.packetId = ++packetId;// OK_PACKET
ok.affectedRows = affectedRows;
if (insertId > 0) {
ok.insertId = insertId;
source.setLastInsertId(insertId);
}
ok.write(source);
} catch (Exception e) {
handleDataProcessException(e, conn);
} finally {
lock.unlock();
}
}
}
}
private boolean canClose(BackendConnection conn, boolean tryErrorFinish) {
conn.setRunning(false);
// realse this connection if safe
session.releaseConnectionIfSafe(conn, LOGGER.isDebugEnabled());
boolean allFinished = false;
if (tryErrorFinish) {
allFinished = this.decrementCountBy(1);
this.tryErrorFinished(conn, allFinished);
}
return allFinished;
}
@Override
public void rowEofResponse(byte[] eof, BackendConnection conn) {
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("on row end reseponse " + conn);
}
if (errorRepsponsed) {
return;
}
if (clearIfSessionClosed(session)) {
return;
} else if (canClose(conn, false)) {
return;
}
ServerConnection source = session.getSource();
if (decrementCountBy(1)) {
if (this.autocommit) {// clear all connections
session.releaseConnections();
}
if (this.isFail() || session.closed()) {
tryErrorFinished(conn, true);
return;
}
try {
lock.lock();
// lazy allocate buffer
allocBuffer();
if (dataMergeSvr != null && !mergeOutputed) {
int i = 0;
int start = dataMergeSvr.getRrs().getLimitStart();
int end = start + dataMergeSvr.getRrs().getLimitSize();
Iterator<RowDataPacket> itor = dataMergeSvr.getResults()
.iterator();
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("output merge result ,total data "
+ dataMergeSvr.getResults().size() + " start :"
+ start + " end :" + end + " package id start:"
+ packetId);
}
while (itor.hasNext()) {
RowDataPacket row = itor.next();
itor.remove();
if (i < start) {
i++;
continue;
} else if (i == end) {
break;
}
i++;
row.packetId = ++packetId;
buffer = row.write(buffer, source, true);
}
}
eof[3] = ++packetId;
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("last packet id:" + packetId);
}
source.write(source.writeToBuffer(eof, buffer));
buffer = null;
} catch (Exception e) {
handleDataProcessException(e, conn);
} finally {
lock.unlock();
if (dataMergeSvr != null) {
dataMergeSvr.clear();
}
}
}
}
@Override
public void fieldEofResponse(byte[] header, List<byte[]> fields,
byte[] eof, BackendConnection conn) {
ServerConnection source = null;
lock.lock();
// lazy allocate buffer
allocBuffer();
try {
if (fieldsReturned) {
return;
}
fieldsReturned = true;
header[3] = ++packetId;
source = session.getSource();
buffer = source.writeToBuffer(header, buffer);
fieldCount = fields.size();
String primaryKey = null;
if (rrs.hasPrimaryKeyToCache()) {
String[] items = rrs.getPrimaryKeyItems();
priamaryKeyTable = items[0];
primaryKey = items[1];
}
Map<String, ColMeta> columToIndx = new HashMap<String, ColMeta>(
fieldCount);
boolean needMerg = (dataMergeSvr != null)
&& dataMergeSvr.getRrs().needMerge();
for (int i = 0, len = fieldCount; i < len; ++i) {
byte[] field = fields.get(i);
if (needMerg) {
FieldPacket fieldPkg = new FieldPacket();
fieldPkg.read(field);
String fieldName = new String(fieldPkg.name).toUpperCase();
if (columToIndx != null
&& !columToIndx.containsKey(fieldName)) {
columToIndx.put(fieldName,
new ColMeta(i, fieldPkg.type));
}
} else if (primaryKey != null && primaryKeyIndex == -1) {
// find primary key index
FieldPacket fieldPkg = new FieldPacket();
fieldPkg.read(field);
String fieldName = new String(fieldPkg.name);
if (primaryKey.equalsIgnoreCase(fieldName)) {
primaryKeyIndex = i;
fieldCount = fields.size();
}
}
field[3] = ++packetId;
buffer = source.writeToBuffer(field, buffer);
}
if (dataMergeSvr != null) {
dataMergeSvr.onRowMetaData(columToIndx, fieldCount);
}
eof[3] = ++packetId;
buffer = source.writeToBuffer(eof, buffer);
} catch (Exception e) {
handleDataProcessException(e, conn);
} finally {
lock.unlock();
}
}
private void handleDataProcessException(Exception e, BackendConnection conn) {
if (!errorRepsponsed) {
LOGGER.warn("caught exception ", e);
setFail(e.toString());
this.tryErrorFinished(conn, true);
}
}
@Override
public void rowResponse(byte[] row, BackendConnection conn) {
if (errorRepsponsed) {
return;
}
lock.lock();
try {
if (dataMergeSvr != null) {
boolean canOutput = dataMergeSvr.onNewRecord(
((RouteResultsetNode) conn.getAttachment()).getName(),
row);
} else {
if (primaryKeyIndex != -1) {// cache
// primaryKey->
// dataNode
RowDataPacket rowDataPkg = new RowDataPacket(fieldCount);
rowDataPkg.read(row);
String primaryKey = new String(
rowDataPkg.fieldValues.get(primaryKeyIndex));
LayerCachePool pool = MycatServer.getInstance()
.getRouterservice().getTableId2DataNodeCache();
String dataNode = ((RouteResultsetNode) conn
.getAttachment()).getName();
pool.putIfAbsent(priamaryKeyTable, primaryKey, dataNode);
}
row[3] = ++packetId;
buffer = session.getSource().writeToBuffer(row, buffer);
}
} catch (Exception e) {
handleDataProcessException(e, conn);
} finally {
lock.unlock();
}
}
@Override
public void clearResources() {
if (dataMergeSvr != null) {
dataMergeSvr.clear();
}
ByteBuffer buf;
lock.lock();
try {
buf = buffer;
if (buf != null) {
buffer = null;
}
} finally {
lock.unlock();
}
if (buf != null) {
session.getSource().recycleIfNeed(buf);
}
}
@Override
public void writeQueueAvailable() {
}
}