com.pinterest.terrapin.storage.ReaderFactory.java Source code

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Here is the source code for com.pinterest.terrapin.storage.ReaderFactory.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.pinterest.terrapin.storage;

import com.google.common.util.concurrent.ThreadFactoryBuilder;
import com.pinterest.terrapin.Constants;
import com.twitter.util.ExecutorServiceFuturePool;
import com.twitter.util.FuturePool;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.hbase.io.hfile.CacheConfig;

import java.io.IOException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

/**
 * Factory class for creating different kinds of readers.
 */
public class ReaderFactory {
    private final PropertiesConfiguration configuration;
    private final FileSystem hadoopFs;
    private final FuturePool readerFuturePool;

    public ReaderFactory(PropertiesConfiguration configuration, FileSystem hadoopFs) {
        this.configuration = configuration;
        this.hadoopFs = hadoopFs;
        int numReaderThreads = this.configuration.getInt(Constants.READER_THREAD_POOL_SIZE, 200);
        ExecutorService threadPool = new ThreadPoolExecutor(numReaderThreads, numReaderThreads, 0, TimeUnit.SECONDS,
                new LinkedBlockingDeque<Runnable>(10000),
                new ThreadFactoryBuilder().setDaemon(false).setNameFormat("reader-pool-%d").build());
        this.readerFuturePool = new ExecutorServiceFuturePool(threadPool);
    }

    public Reader createHFileReader(String hdfsPath, CacheConfig cacheConfig) throws IOException {
        return new HFileReader(hadoopFs, hdfsPath, cacheConfig, readerFuturePool);
    }
}