org.apache.druid.segment.loading.MMappedQueryableSegmentizerFactory Maven / Gradle / Ivy
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A module that is everything required to understands Druid Segments
/*
* 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.apache.druid.segment.loading;
import com.fasterxml.jackson.annotation.JacksonInject;
import com.google.common.base.Preconditions;
import org.apache.druid.segment.IndexIO;
import org.apache.druid.segment.QueryableIndexSegment;
import org.apache.druid.segment.Segment;
import org.apache.druid.segment.SegmentLazyLoadFailCallback;
import org.apache.druid.timeline.DataSegment;
import java.io.File;
import java.io.IOException;
/**
*/
public class MMappedQueryableSegmentizerFactory implements SegmentizerFactory
{
private final IndexIO indexIO;
public MMappedQueryableSegmentizerFactory(@JacksonInject IndexIO indexIO)
{
this.indexIO = Preconditions.checkNotNull(indexIO, "Null IndexIO");
}
@Override
public Segment factorize(DataSegment dataSegment, File parentDir, boolean lazy, SegmentLazyLoadFailCallback loadFailed) throws SegmentLoadingException
{
try {
return new QueryableIndexSegment(indexIO.loadIndex(parentDir, lazy, loadFailed), dataSegment.getId());
}
catch (IOException e) {
throw new SegmentLoadingException(e, "%s", e.getMessage());
}
}
}