com.hazelcast.org.apache.calcite.adapter.jdbc.JdbcUtils Maven / Gradle / Ivy
/*
* 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 com.hazelcast.org.apache.calcite.adapter.jdbc;
import com.hazelcast.org.apache.calcite.avatica.ColumnMetaData;
import com.hazelcast.org.apache.calcite.avatica.util.DateTimeUtils;
import com.hazelcast.org.apache.calcite.linq4j.function.Function0;
import com.hazelcast.org.apache.calcite.linq4j.function.Function1;
import com.hazelcast.org.apache.calcite.sql.SqlDialect;
import com.hazelcast.org.apache.calcite.sql.SqlDialectFactory;
import com.hazelcast.org.apache.calcite.util.ImmutableNullableList;
import com.hazelcast.org.apache.calcite.util.Pair;
import com.hazelcast.org.apache.commons.dbcp2.BasicDataSource;
import com.hazelcast.com.google.common.cache.CacheBuilder;
import com.hazelcast.com.google.common.cache.CacheLoader;
import com.hazelcast.com.google.common.cache.LoadingCache;
import com.hazelcast.com.google.common.collect.ImmutableList;
import com.hazelcast.com.google.common.primitives.Ints;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.Date;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Time;
import java.sql.Timestamp;
import java.sql.Types;
import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.List;
import java.util.Map;
import java.util.TimeZone;
import javax.annotation.Nonnull;
import javax.sql.DataSource;
/**
* Utilities for the JDBC provider.
*/
final class JdbcUtils {
private JdbcUtils() {
throw new AssertionError("no instances!");
}
/** Pool of dialects. */
static class DialectPool {
final Map> map0 = new IdentityHashMap<>();
final Map map = new HashMap<>();
public static final DialectPool INSTANCE = new DialectPool();
// TODO: Discuss why we need a pool. If we do, I'd like to improve performance
synchronized SqlDialect get(SqlDialectFactory dialectFactory, DataSource dataSource) {
Map dialectMap = map0.get(dataSource);
if (dialectMap != null) {
final SqlDialect sqlDialect = dialectMap.get(dialectFactory);
if (sqlDialect != null) {
return sqlDialect;
}
}
Connection connection = null;
try {
connection = dataSource.getConnection();
DatabaseMetaData metaData = connection.getMetaData();
String productName = metaData.getDatabaseProductName();
String productVersion = metaData.getDatabaseProductVersion();
List key = ImmutableList.of(productName, productVersion, dialectFactory);
SqlDialect dialect = map.get(key);
if (dialect == null) {
dialect = dialectFactory.create(metaData);
map.put(key, dialect);
if (dialectMap == null) {
dialectMap = new IdentityHashMap<>();
map0.put(dataSource, dialectMap);
}
dialectMap.put(dialectFactory, dialect);
}
connection.close();
connection = null;
return dialect;
} catch (SQLException e) {
throw new RuntimeException(e);
} finally {
if (connection != null) {
try {
connection.close();
} catch (SQLException e) {
// ignore
}
}
}
}
}
/** Builder that calls {@link ResultSet#getObject(int)} for every column,
* or {@code getXxx} if the result type is a primitive {@code xxx},
* and returns an array of objects for each row. */
static class ObjectArrayRowBuilder implements Function0 {
private final ResultSet resultSet;
private final int columnCount;
private final ColumnMetaData.Rep[] reps;
private final int[] types;
ObjectArrayRowBuilder(ResultSet resultSet, ColumnMetaData.Rep[] reps,
int[] types)
throws SQLException {
this.resultSet = resultSet;
this.reps = reps;
this.types = types;
this.columnCount = resultSet.getMetaData().getColumnCount();
}
public static Function1> factory(
final List> list) {
return resultSet -> {
try {
return new ObjectArrayRowBuilder(
resultSet,
Pair.left(list).toArray(new ColumnMetaData.Rep[list.size()]),
Ints.toArray(Pair.right(list)));
} catch (SQLException e) {
throw new RuntimeException(e);
}
};
}
public Object[] apply() {
try {
final Object[] values = new Object[columnCount];
for (int i = 0; i < columnCount; i++) {
values[i] = value(i);
}
return values;
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
/**
* Gets a value from a given column in a JDBC result set.
*
* @param i Ordinal of column (1-based, per JDBC)
*/
private Object value(int i) throws SQLException {
// MySQL returns timestamps shifted into local time. Using
// getTimestamp(int, Calendar) with a UTC calendar should prevent this,
// but does not. So we shift explicitly.
switch (types[i]) {
case Types.TIMESTAMP:
return shift(resultSet.getTimestamp(i + 1));
case Types.TIME:
return shift(resultSet.getTime(i + 1));
case Types.DATE:
return shift(resultSet.getDate(i + 1));
}
return reps[i].jdbcGet(resultSet, i + 1);
}
private static Timestamp shift(Timestamp v) {
if (v == null) {
return null;
}
long time = v.getTime();
int offset = TimeZone.getDefault().getOffset(time);
return new Timestamp(time + offset);
}
private static Time shift(Time v) {
if (v == null) {
return null;
}
long time = v.getTime();
int offset = TimeZone.getDefault().getOffset(time);
return new Time((time + offset) % DateTimeUtils.MILLIS_PER_DAY);
}
private static Date shift(Date v) {
if (v == null) {
return null;
}
long time = v.getTime();
int offset = TimeZone.getDefault().getOffset(time);
return new Date(time + offset);
}
}
/** Ensures that if two data sources have the same definition, they will use
* the same object.
*
* This in turn makes it easier to cache
* {@link com.hazelcast.org.apache.calcite.sql.SqlDialect} objects. Otherwise, each time we
* see a new data source, we have to open a connection to find out what
* database product and version it is. */
static class DataSourcePool {
public static final DataSourcePool INSTANCE = new DataSourcePool();
private final LoadingCache, BasicDataSource> cache =
CacheBuilder.newBuilder().softValues()
.build(CacheLoader.from(DataSourcePool::dataSource));
private static @Nonnull BasicDataSource dataSource(
@Nonnull List key) {
BasicDataSource dataSource = new BasicDataSource();
dataSource.setUrl(key.get(0));
dataSource.setUsername(key.get(1));
dataSource.setPassword(key.get(2));
dataSource.setDriverClassName(key.get(3));
return dataSource;
}
public DataSource get(String url, String driverClassName,
String username, String password) {
// Get data source objects from a cache, so that we don't have to sniff
// out what kind of database they are quite as often.
final List key =
ImmutableNullableList.of(url, username, password, driverClassName);
return cache.getUnchecked(key);
}
}
}
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