com.facebook.presto.tpcds.statistics.TableStatisticsDataRepository Maven / Gradle / Ivy
/*
* 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.tpcds.statistics;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.datatype.jdk8.Jdk8Module;
import com.teradata.tpcds.Table;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.net.URL;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Optional;
import static java.lang.String.format;
public class TableStatisticsDataRepository
{
private final ObjectMapper objectMapper = new ObjectMapper()
.registerModule(new Jdk8Module());
public void save(
String schemaName,
Table table,
TableStatisticsData statisticsData)
{
schemaName = normalizeSchemaName(schemaName);
String filename = table.getName();
Path path = Paths.get("presto-tpcds", "src", "main", "resources", "tpcds", "statistics", schemaName, filename + ".json");
writeStatistics(path, statisticsData);
}
private String normalizeSchemaName(String schemaName)
{
return schemaName.trim()
.replaceAll("\\.0+$", "");
}
private void writeStatistics(Path path, TableStatisticsData tableStatisticsData)
{
File file = path.toFile();
file.getParentFile().mkdirs();
try {
objectMapper
.writerWithDefaultPrettyPrinter()
.writeValue(file, tableStatisticsData);
try (FileWriter fileWriter = new FileWriter(file, true)) {
fileWriter.append('\n');
}
}
catch (IOException e) {
throw new RuntimeException("Could not save table statistics data", e);
}
}
public Optional load(String schemaName, Table table)
{
schemaName = normalizeSchemaName(schemaName);
String filename = table.getName();
String resourcePath = "/tpcds/statistics/" + schemaName + "/" + filename + ".json";
return readStatistics(resourcePath);
}
private Optional readStatistics(String resourcePath)
{
URL resource = getClass().getResource(resourcePath);
if (resource == null) {
return Optional.empty();
}
try {
return Optional.of(objectMapper.readValue(resource, TableStatisticsData.class));
}
catch (Exception e) {
throw new RuntimeException(format("Failed to parse stats from resource [%s]", resourcePath), e);
}
}
}