com.aliyun.fs.oss.utils.ResourceLoader.java Source code

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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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.aliyun.fs.oss.utils;

import org.apache.commons.lang.SystemUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;

import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.List;

public class ResourceLoader {
    private static final Log LOG = LogFactory.getLog(ResourceLoader.class);
    private URLClassLoader urlClassLoader = null;

    private ResourceLoader() {
    }

    public static ResourceLoader getInstance() {
        return LazyHolder.INSTANCE;
    }

    private static List<URL> geClassLoaderURLs(Configuration conf) throws Exception {
        String dependPath = conf.get("fs.oss.core.dependency.path");
        String[] sdkDeps = null;
        Boolean runLocal = conf.getBoolean("mapreduce.job.run-local", false);
        if ((dependPath == null || dependPath.isEmpty()) && !runLocal) {
            throw new RuntimeException(
                    "Job dose not run locally, set " + "\"fs.oss.core.dependency.path\" first please.");
        } else if (dependPath == null || dependPath.isEmpty()) {
            LOG.info("\"mapreduce.job.run-local\" set true.");
        } else {
            sdkDeps = dependPath.split(",");
        }

        ArrayList<URL> urls = new ArrayList<URL>();
        if (sdkDeps != null) {
            for (String dep : sdkDeps) {
                urls.add(new URL("file://" + dep));
            }
        }
        String[] cp;
        if (conf.getBoolean("mapreduce.job.run-local", false)) {
            if (SystemUtils.IS_OS_WINDOWS) {
                cp = System.getProperty("java.class.path").split(";");

            } else {
                cp = System.getProperty("java.class.path").split(":");
            }
            for (String entity : cp) {
                urls.add(new URL("file:" + entity));
            }
        }

        return urls;
    }

    @SuppressWarnings("unchecked")
    public synchronized URLClassLoader getUrlClassLoader(Configuration conf) {
        if (urlClassLoader == null) {
            try {
                List<URL> urls = geClassLoaderURLs(conf);
                urlClassLoader = new URLClassLoader(urls.toArray(new URL[0]), null);
            } catch (Exception e) {
                throw new RuntimeException("Can not initialize OSS URLClassLoader, " + e.getMessage());
            }
        }
        return urlClassLoader;
    }

    private static class LazyHolder {
        private static final ResourceLoader INSTANCE = new ResourceLoader();
    }
}