/*
* 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.facebook.presto.kafka.util;
import com.facebook.presto.Session;
import com.facebook.presto.client.Column;
import com.facebook.presto.client.QueryResults;
import com.facebook.presto.server.testing.TestingPrestoServer;
import com.facebook.presto.spi.type.TimeZoneKey;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.spi.type.Varchars;
import com.facebook.presto.tests.AbstractTestingPrestoClient;
import com.facebook.presto.tests.ResultsSession;
import com.google.common.collect.ImmutableMap;
import kafka.javaapi.producer.Producer;
import kafka.producer.KeyedMessage;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.ISODateTimeFormat;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import static com.facebook.presto.spi.type.BigintType.BIGINT;
import static com.facebook.presto.spi.type.BooleanType.BOOLEAN;
import static com.facebook.presto.spi.type.DateTimeEncoding.unpackMillisUtc;
import static com.facebook.presto.spi.type.DateType.DATE;
import static com.facebook.presto.spi.type.DoubleType.DOUBLE;
import static com.facebook.presto.spi.type.IntegerType.INTEGER;
import static com.facebook.presto.spi.type.TimeType.TIME;
import static com.facebook.presto.spi.type.TimeWithTimeZoneType.TIME_WITH_TIME_ZONE;
import static com.facebook.presto.spi.type.TimestampType.TIMESTAMP;
import static com.facebook.presto.spi.type.TimestampWithTimeZoneType.TIMESTAMP_WITH_TIME_ZONE;
import static com.facebook.presto.util.DateTimeUtils.parseTime;
import static com.facebook.presto.util.DateTimeUtils.parseTimestampWithTimeZone;
import static com.facebook.presto.util.DateTimeUtils.parseTimestampWithoutTimeZone;
import static com.google.common.base.Preconditions.checkState;
import static java.util.Objects.requireNonNull;
public class KafkaLoader
extends AbstractTestingPrestoClient<Void>
{
private static final DateTimeFormatter ISO8601_FORMATTER = ISODateTimeFormat.dateTime();
private final String topicName;
private final Producer<Long, Object> producer;
private final AtomicLong count = new AtomicLong();
public KafkaLoader(Producer<Long, Object> producer,
String topicName,
TestingPrestoServer prestoServer,
Session defaultSession)
{
super(prestoServer, defaultSession);
this.topicName = topicName;
this.producer = producer;
}
@Override
public ResultsSession<Void> getResultSession(Session session)
{
requireNonNull(session, "session is null");
return new KafkaLoadingSession(session);
}
private class KafkaLoadingSession
implements ResultsSession<Void>
{
private final AtomicReference<List<Type>> types = new AtomicReference<>();
private final TimeZoneKey timeZoneKey;
private KafkaLoadingSession(Session session)
{
this.timeZoneKey = session.getTimeZoneKey();
}
@Override
public void addResults(QueryResults results)
{
if (types.get() == null && results.getColumns() != null) {
types.set(getTypes(results.getColumns()));
}
if (results.getData() != null) {
checkState(types.get() != null, "Data without types received!");
List<Column> columns = results.getColumns();
for (List<Object> fields : results.getData()) {
ImmutableMap.Builder<String, Object> builder = ImmutableMap.builder();
for (int i = 0; i < fields.size(); i++) {
Type type = types.get().get(i);
Object value = convertValue(fields.get(i), type);
if (value != null) {
builder.put(columns.get(i).getName(), value);
}
}
producer.send(new KeyedMessage<>(topicName, count.getAndIncrement(), builder.build()));
}
}
}
@Override
public Void build(Map<String, String> setSessionProperties, Set<String> resetSessionProperties)
{
return null;
}
private Object convertValue(Object value, Type type)
{
if (value == null) {
return null;
}
if (BOOLEAN.equals(type) || Varchars.isVarcharType(type)) {
return value;
}
if (BIGINT.equals(type)) {
return ((Number) value).longValue();
}
if (INTEGER.equals(type)) {
return ((Number) value).intValue();
}
if (DOUBLE.equals(type)) {
return ((Number) value).doubleValue();
}
if (DATE.equals(type)) {
return value;
}
if (TIME.equals(type)) {
return ISO8601_FORMATTER.print(parseTime(timeZoneKey, (String) value));
}
if (TIMESTAMP.equals(type)) {
return ISO8601_FORMATTER.print(parseTimestampWithoutTimeZone(timeZoneKey, (String) value));
}
if (TIME_WITH_TIME_ZONE.equals(type) || TIMESTAMP_WITH_TIME_ZONE.equals(type)) {
return ISO8601_FORMATTER.print(unpackMillisUtc(parseTimestampWithTimeZone(timeZoneKey, (String) value)));
}
throw new AssertionError("unhandled type: " + type);
}
}
}