com.dtstack.jlogstash.classloader.JarClassLoader.java Source code

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Here is the source code for com.dtstack.jlogstash.classloader.JarClassLoader.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.dtstack.jlogstash.classloader;

import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.dtstack.jlogstash.exception.ExceptionUtil;
import com.dtstack.jlogstash.exception.LogstashException;
import com.google.common.collect.Maps;

/**
 * 
 * Reason: TODO ADD REASON(?)
 * Date: 20161216 ?15:26:07
 * Company: www.dtstack.com
 * @author sishu.yss
 *
 */
public class JarClassLoader {

    private static Logger logger = LoggerFactory.getLogger(JarClassLoader.class);

    private static String userDir = System.getProperty("user.dir");

    private Map<String, URL[]> jarUrls = null;

    public JarClassLoader() {
        if (jarUrls == null) {
            jarUrls = getClassLoadJarUrls();
            if (jarUrls != null && jarUrls.size() > 0) {
                Thread.currentThread().setContextClassLoader(null);
            }
        }
    }

    public ClassLoader getClassLoaderByPluginName(String name) {
        URL[] urls = jarUrls.get(name);
        ClassLoader classLoader = this.getClass().getClassLoader();
        if (urls == null | urls.length == 0) {
            logger.warn("{}:load by AppclassLoader", name);
            return classLoader;
        }
        return new URLClassLoader(urls, classLoader);
    }

    private Map<String, URL[]> getClassLoadJarUrls() {
        Map<String, URL[]> result = Maps.newConcurrentMap();
        try {
            logger.warn("userDir:{}", userDir);
            String input = String.format("%s/plugin/input", userDir);
            File finput = new File(input);
            if (!finput.exists()) {
                throw new LogstashException(String.format("%s direcotry not found", input));
            }

            String filter = String.format("%s/plugin/filter", userDir);
            File ffilter = new File(filter);
            if (!ffilter.exists()) {
                throw new LogstashException(String.format("%s direcotry not found", filter));
            }

            String output = String.format("%s/plugin/output", userDir);
            File foutput = new File(output);
            if (!foutput.exists()) {
                throw new LogstashException(String.format("%s direcotry not found", output));
            }
            Map<String, URL[]> inputs = getClassLoadJarUrls(finput);
            result.putAll(inputs);
            Map<String, URL[]> filters = getClassLoadJarUrls(ffilter);
            result.putAll(filters);
            Map<String, URL[]> outputs = getClassLoadJarUrls(foutput);
            result.putAll(outputs);
            logger.warn("getClassLoadJarUrls:{}", result);
        } catch (Exception e) {
            logger.error("getClassLoadJarUrls error:{}", ExceptionUtil.getErrorMessage(e));
        }
        return result;
    }

    private Map<String, URL[]> getClassLoadJarUrls(File dir) throws MalformedURLException, IOException {
        String dirName = dir.getName();
        Map<String, URL[]> jurls = Maps.newConcurrentMap();
        File[] files = dir.listFiles();
        if (files != null && files.length > 0) {
            for (File f : files) {
                String jarName = f.getName();
                if (f.isFile() && jarName.endsWith(".jar")) {
                    jarName = jarName.split("-")[0].toLowerCase();
                    String[] jns = jarName.split("\\.");
                    jurls.put(String.format("%s:%s", dirName, jns.length == 0 ? jarName : jns[jns.length - 1]),
                            new URL[] { f.toURI().toURL() });
                }
            }
        }
        return jurls;
    }
}