org.apache.hadoop.chukwa.dataloader.MetricDataLoaderPool.java Source code

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Here is the source code for org.apache.hadoop.chukwa.dataloader.MetricDataLoaderPool.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.hadoop.chukwa.dataloader;

import java.io.IOException;
import java.util.concurrent.CompletionService;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.chukwa.conf.ChukwaConfiguration;
import org.apache.hadoop.chukwa.util.ExceptionUtil;

public class MetricDataLoaderPool extends DataLoaderFactory {
    private static Log log = LogFactory.getLog(MetricDataLoaderPool.class);

    protected MetricDataLoader threads[] = null;
    private static String DATA_LOADER_THREAD_LIMIT = "chukwa.data.loader.threads.limit";
    private int size = 1;
    private static CompletionService completion = null;
    private static ExecutorService executor = null;

    public MetricDataLoaderPool() {
    }

    public void load(ChukwaConfiguration conf, FileSystem fs, FileStatus[] fileList) throws IOException {

        if (executor == null) {
            try {
                this.size = Integer.parseInt(conf.get(DATA_LOADER_THREAD_LIMIT));
            } catch (Exception e) {
                this.size = 1;
            }
            executor = Executors.newFixedThreadPool(size);
        }
        if (completion == null) {
            completion = new ExecutorCompletionService(executor);
        }
        try {
            for (int i = 0; i < fileList.length; i++) {
                String filename = fileList[i].getPath().toUri().toString();
                log.info("Processing: " + filename);
                completion.submit(new MetricDataLoader(conf, fs, filename));
            }
            for (int i = 0; i < fileList.length; i++) {
                completion.take().get();
            }
        } catch (Exception e) {
            log.error(ExceptionUtil.getStackTrace(e));
            throw new IOException();
        } finally {
        }
    }

    public void shutdown() throws InterruptedException {
        executor.shutdown();
        executor.awaitTermination(30, TimeUnit.SECONDS);
        executor.shutdownNow();
    }
}