org.apache.pulsar.io.hdfs.sink.HdfsSyncThread.java Source code

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Here is the source code for org.apache.pulsar.io.hdfs.sink.HdfsSyncThread.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 org.apache.pulsar.io.hdfs.sink;

import java.io.IOException;
import java.util.concurrent.BlockingQueue;

import org.apache.commons.collections.CollectionUtils;
import org.apache.hadoop.fs.Syncable;
import org.apache.pulsar.functions.api.Record;

/**
 * A thread that runs in the background and acknowledges Records
 * after they have been written to disk.
 *
 * @param <V>
 */
public class HdfsSyncThread<V> extends Thread {

    private final Syncable stream;
    private final BlockingQueue<Record<V>> unackedRecords;
    private final long syncInterval;
    private boolean keepRunning = true;

    public HdfsSyncThread(Syncable stream, BlockingQueue<Record<V>> unackedRecords, long syncInterval) {
        this.stream = stream;
        this.unackedRecords = unackedRecords;
        this.syncInterval = syncInterval;
    }

    @Override
    public void run() {
        while (keepRunning) {
            try {
                Thread.sleep(syncInterval);
                ackRecords();
            } catch (InterruptedException e) {
                return;
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public final void halt() throws IOException, InterruptedException {
        keepRunning = false;
        ackRecords();
    }

    private void ackRecords() throws IOException, InterruptedException {

        if (CollectionUtils.isEmpty(unackedRecords)) {
            return;
        }

        synchronized (stream) {
            stream.hsync();
        }

        while (!unackedRecords.isEmpty()) {
            unackedRecords.take().ack();
        }
    }
}