sorcer.boot.util.ClassPathVerifier.java Source code

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Here is the source code for sorcer.boot.util.ClassPathVerifier.java

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/**
 *
 * Copyright 2013 the original author or authors.
 * Copyright 2013 Sorcersoft.com S.A.
 *
 * Licensed 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 sorcer.boot.util;

import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multimaps;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import sorcer.core.SorcerEnv;

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

/**
 * @author Rafa Krupiski
 */
public class ClassPathVerifier {
    final private static Logger log = LoggerFactory.getLogger(ClassPathVerifier.class);

    public void verifyClassPaths(ClassLoader cl) {

        Multimap<ClassLoader, String> classPaths = HashMultimap.create();
        for (ClassLoader classLoader : getClassLoaderTree(cl)) {
            classPaths.get(classLoader).addAll(getClassPath(classLoader));
        }
        HashMultimap<String, ClassLoader> dest = HashMultimap.create();
        Multimap<String, ClassLoader> classLoaders = Multimaps.invertFrom(classPaths, dest);
        for (String key : classLoaders.keySet()) {
            // don't check bootstrap classpath
            if (SorcerEnv.getRepoDir() == null || !key.contains(SorcerEnv.getRepoDir()))
                continue;
            if (classLoaders.get(key).size() > 1) {
                StringBuilder msg = new StringBuilder(key).append(" is loaded by multiple class loaders:\n");
                for (ClassLoader kcl : classLoaders.get(key)) {
                    msg.append("\t").append(kcl).append("\n");
                }
                log.info("{}", msg);
            }
        }
    }

    private Collection<String> getClassPath(ClassLoader curClassLoader) {
        if (curClassLoader instanceof URLClassLoader) {
            URL[] urls = ((URLClassLoader) curClassLoader).getURLs();
            if (urls != null) {
                Collection<String> result = new ArrayList<String>(urls.length);
                for (URL url : urls) {
                    result.add(url.toString());
                }
                return result;
            }
        } else {
            log.debug("{} is an unknown ClassLoader", curClassLoader);
        }
        return Collections.emptyList();
    }

    public List<ClassLoader> getClassLoaderTree(ClassLoader classloader) {
        List<ClassLoader> loaderList = new ArrayList<ClassLoader>();
        while (classloader != null) {
            loaderList.add(classloader);
            classloader = classloader.getParent();
        }
        return loaderList;
    }

}