io.druid.segment.writeout.TmpFileSegmentWriteOutMedium.java Source code

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Here is the source code for io.druid.segment.writeout.TmpFileSegmentWriteOutMedium.java

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/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets 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 io.druid.segment.writeout;

import io.druid.java.util.common.io.Closer;
import org.apache.commons.io.FileUtils;

import java.io.File;
import java.io.IOException;
import java.nio.channels.FileChannel;
import java.nio.file.StandardOpenOption;

public final class TmpFileSegmentWriteOutMedium implements SegmentWriteOutMedium {
    private final File dir;
    private final Closer closer = Closer.create();

    TmpFileSegmentWriteOutMedium(File outDir) throws IOException {
        File tmpOutputFilesDir = new File(outDir, "tmpOutputFiles");
        FileUtils.forceMkdir(tmpOutputFilesDir);
        closer.register(() -> FileUtils.deleteDirectory(tmpOutputFilesDir));
        this.dir = tmpOutputFilesDir;
    }

    @Override
    public WriteOutBytes makeWriteOutBytes() throws IOException {
        File file = File.createTempFile("filePeon", null, dir);
        FileChannel ch = FileChannel.open(file.toPath(), StandardOpenOption.READ, StandardOpenOption.WRITE);
        closer.register(file::delete);
        closer.register(ch);
        return new FileWriteOutBytes(file, ch);
    }

    @Override
    public Closer getCloser() {
        return closer;
    }

    @Override
    public void close() throws IOException {
        closer.close();
    }
}