/*
* Copyright 2011 The Apache Software Foundation
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.lealone.hbase.engine;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.Callable;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadPoolExecutor;
import org.apache.hadoop.hbase.master.HMaster;
import org.apache.hadoop.hbase.regionserver.HRegionServer;
import org.lealone.command.Parser;
import org.lealone.dbobject.Schema;
import org.lealone.dbobject.User;
import org.lealone.dbobject.table.Table;
import org.lealone.engine.Database;
import org.lealone.engine.Session;
import org.lealone.engine.SessionRemote;
import org.lealone.hbase.command.CommandParallel;
import org.lealone.hbase.command.HBaseParser;
import org.lealone.hbase.command.dml.HBaseInsert;
import org.lealone.hbase.dbobject.HBaseSequence;
import org.lealone.hbase.result.HBaseRow;
import org.lealone.hbase.transaction.TimestampService;
import org.lealone.hbase.transaction.Transaction;
import org.lealone.message.DbException;
import org.lealone.result.Row;
import org.lealone.util.New;
public class HBaseSession extends Session {
private static final ThreadPoolExecutor pool = CommandParallel.getThreadPoolExecutor();
/**
* HBase的HMaster对象，master和regionServer不可能同时非null
*/
private HMaster master;
/**
* HBase的HRegionServer对象，master和regionServer不可能同时非null
*/
private HRegionServer regionServer;
/**
* 最初从Client端传递过来的配置参数
*/
private Properties originalProperties;
private TimestampService timestampService;
private volatile Transaction transaction;
//参与本次事务的其他SessionRemote
private final Map<String, SessionRemote> sessionRemoteCache = New.hashMap();
public HBaseSession(Database database, User user, int id) {
super(database, user, id);
}
void addSessionRemote(String url, SessionRemote sessionRemote) {
sessionRemoteCache.put(url, sessionRemote);
}
SessionRemote getSessionRemote(String url) {
return sessionRemoteCache.get(url);
}
public HMaster getMaster() {
return master;
}
public TimestampService getTimestampService() {
return timestampService;
}
public void setMaster(HMaster master) {
this.master = master;
if (master != null)
this.timestampService = HBaseMasterObserver.getTimestampService();
}
public boolean isMaster() {
return master != null;
}
public HRegionServer getRegionServer() {
return regionServer;
}
public void setRegionServer(HRegionServer regionServer) {
this.regionServer = regionServer;
if (regionServer != null)
this.timestampService = ((org.lealone.hbase.engine.HBaseRegionServer) regionServer)
.getTimestampService();
}
public boolean isRegionServer() {
return regionServer != null;
}
public Properties getOriginalProperties() {
return originalProperties;
}
public void setOriginalProperties(Properties originalProperties) {
this.originalProperties = originalProperties;
}
@Override
public HBaseDatabase getDatabase() {
return (HBaseDatabase) database;
}
@Override
public Parser createParser() {
return new HBaseParser(this);
}
@Override
public HBaseInsert createInsert() {
return new HBaseInsert(this);
}
@Override
public HBaseSequence createSequence(Schema schema, int id, String name, boolean belongsToTable) {
return new HBaseSequence(schema, id, name, belongsToTable);
}
@Override
public void log(Table table, short operation, Row row) {
// do nothing
}
@Override
public void setAutoCommit(boolean autoCommit) {
super.setAutoCommit(autoCommit);
if (!autoCommit && transaction == null) {
beginTransaction();
}
}
@Override
public void begin() {
super.begin();
setAutoCommit(false);
}
@Override
public Transaction getTransaction() {
if (transaction == null)
beginTransaction();
return transaction;
}
private void beginTransaction() {
transaction = new Transaction(this);
}
private void endTransaction() {
if (!sessionRemoteCache.isEmpty()) {
for (SessionRemote sr : sessionRemoteCache.values()) {
sr.setTransaction(null);
SessionRemotePool.release(sr);
}
sessionRemoteCache.clear();
}
if (!isRoot())
super.setAutoCommit(true);
}
@Override
public void commit(boolean ddl) {
commit(ddl, null);
}
@Override
public void commit(boolean ddl, String allLocalTransactionNames) {
if (this.transaction != null) {
try {
//避免重复commit
Transaction transaction = this.transaction;
this.transaction = null;
if (allLocalTransactionNames == null)
allLocalTransactionNames = transaction.getAllLocalTransactionNames();
List<Future<Void>> futures = null;
if (!getAutoCommit() && sessionRemoteCache.size() > 0)
futures = parallelCommitOrRollback(allLocalTransactionNames);
transaction.commit(allLocalTransactionNames);
super.commit(ddl);
if (futures != null)
waitFutures(futures);
} finally {
endTransaction();
}
}
}
@Override
public void rollback() {
if (this.transaction != null) {
try {
Transaction transaction = this.transaction;
this.transaction = null;
List<Future<Void>> futures = null;
if (!getAutoCommit() && sessionRemoteCache.size() > 0)
futures = parallelCommitOrRollback(null);
transaction.rollback();
super.rollback();
if (futures != null)
waitFutures(futures);
} finally {
endTransaction();
}
}
}
private List<Future<Void>> parallelCommitOrRollback(final String allLocalTransactionNames) {
int size = sessionRemoteCache.size();
List<Future<Void>> futures = New.arrayList(size);
for (final SessionRemote sessionRemote : sessionRemoteCache.values()) {
futures.add(pool.submit(new Callable<Void>() {
public Void call() throws Exception {
if (allLocalTransactionNames != null)
sessionRemote.commitTransaction(allLocalTransactionNames);
else
sessionRemote.rollbackTransaction();
return null;
}
}));
}
return futures;
}
private void waitFutures(List<Future<Void>> futures) {
try {
for (int i = 0, size = futures.size(); i < size; i++) {
futures.get(i).get();
}
} catch (Exception e) {
throw DbException.convert(e);
}
}
public void log(HBaseRow row) {
if (transaction == null)
throw DbException.throwInternalError();
transaction.log(row);
}
@Override
public String getHostAndPort() {
if (regionServer != null)
return regionServer.getServerName().getHostAndPort();
else
return master.getServerName().getHostAndPort();
}
@Override
public void addSavepoint(String name) {
if (transaction != null) {
if (!getAutoCommit() && sessionRemoteCache.size() > 0)
parallelSavepoint(true, name);
transaction.addSavepoint(name);
}
}
@Override
public void rollbackToSavepoint(String name) {
if (transaction != null) {
if (!getAutoCommit() && sessionRemoteCache.size() > 0)
parallelSavepoint(false, name);
transaction.rollbackToSavepoint(name);
}
}
private void parallelSavepoint(final boolean add, final String name) {
int size = sessionRemoteCache.size();
List<Future<Void>> futures = New.arrayList(size);
for (final SessionRemote sessionRemote : sessionRemoteCache.values()) {
futures.add(pool.submit(new Callable<Void>() {
public Void call() throws Exception {
if (add)
sessionRemote.addSavepoint(name);
else
sessionRemote.rollbackToSavepoint(name);
return null;
}
}));
}
try {
for (int i = 0; i < size; i++) {
futures.get(i).get();
}
} catch (Exception e) {
throw DbException.convert(e);
}
}
}