com.uber.hoodie.common.io.storage.SizeAwareFSDataOutputStream.java Source code

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Here is the source code for com.uber.hoodie.common.io.storage.SizeAwareFSDataOutputStream.java

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/*
 * 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.uber.hoodie.common.io.storage;

import com.uber.hoodie.common.util.ConsistencyGuard;
import com.uber.hoodie.exception.HoodieException;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicLong;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.Path;

/**
 * Wrapper over <code>FSDataOutputStream</code> to keep track of the size of the written bytes. This
 * gives a cheap way to check on the underlying file size.
 */
public class SizeAwareFSDataOutputStream extends FSDataOutputStream {

    // A callback to call when the output stream is closed.
    private final Runnable closeCallback;
    // Keep track of the bytes written
    private final AtomicLong bytesWritten = new AtomicLong(0L);
    // Path
    private final Path path;
    // Consistency guard
    private final ConsistencyGuard consistencyGuard;

    public SizeAwareFSDataOutputStream(Path path, FSDataOutputStream out, ConsistencyGuard consistencyGuard,
            Runnable closeCallback) throws IOException {
        super(out);
        this.path = path;
        this.closeCallback = closeCallback;
        this.consistencyGuard = consistencyGuard;
    }

    @Override
    public synchronized void write(byte[] b, int off, int len) throws IOException {
        bytesWritten.addAndGet(len);
        super.write(b, off, len);
    }

    @Override
    public void write(byte[] b) throws IOException {
        bytesWritten.addAndGet(b.length);
        super.write(b);
    }

    @Override
    public void close() throws IOException {
        super.close();
        try {
            consistencyGuard.waitTillFileAppears(path);
        } catch (TimeoutException e) {
            throw new HoodieException(e);
        }
        closeCallback.run();
    }

    public long getBytesWritten() {
        return bytesWritten.get();
    }

}