/*
* 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.openejb.server.cli.command;
import org.apache.openejb.AppContext;
import org.apache.openejb.loader.SystemInstance;
import org.apache.openejb.spi.ContainerSystem;
import org.apache.xbean.finder.UrlSet;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
@Command(name = ClassLoaderCommand.CLASSLOADER_CMD, usage = ClassLoaderCommand.CLASSLOADER_CMD + " <app>", description = "print classloader info")
public class ClassLoaderCommand extends AbstractCommand {
public static final String CLASSLOADER_CMD = "classloader";
private static final String INDENT = " ";
@Override
public void execute(final String cmd) {
final String appName = extractAppName(cmd);
final ContainerSystem cs = SystemInstance.get().getComponent(ContainerSystem.class);
for (AppContext ctx : cs.getAppContexts()) {
if (appName.equalsIgnoreCase(ctx.getId())) {
dumpClassLoader(ctx.getClassLoader());
return;
}
}
streamManager.writeErr("can't find app " + appName);
streamManager.writeErr("available apps are:");
for (AppContext ctx : cs.getAppContexts()) {
streamManager.writeErr("- " + ctx.getId());
}
}
protected void dumpClassLoader(final ClassLoader classLoader) {
final List<ClassLoader> classLoaders = new ArrayList<ClassLoader>();
ClassLoader current = classLoader;
while (current != null) {
classLoaders.add(current);
current = current.getParent();
}
Collections.reverse(classLoaders);
for (ClassLoader cl : classLoaders) {
streamManager.writeOut("+" + cl.toString());
UrlSet urls;
try {
urls = new UrlSet(cl);
if (cl.getParent() != null) {
urls = urls.exclude(cl.getParent());
}
} catch (IOException e) {
streamManager.writeErr(INDENT + "` can't get urls of this classloader");
continue;
}
final List<URL> listUrls = urls.getUrls();
Collections.sort(listUrls, new URLComparator());
final Iterator<URL> it = listUrls.iterator();
while (it.hasNext()) {
final String value = it.next().toExternalForm();
final StringBuilder builder = new StringBuilder(INDENT);
if (it.hasNext()) {
builder.append('|');
} else {
builder.append('`');
}
builder.append(" ").append(value);
streamManager.writeOut(builder.toString());
}
}
}
protected String extractAppName(final String cmd) {
if (CLASSLOADER_CMD.length() == cmd.length()) {
return "";
}
return cmd.substring(CLASSLOADER_CMD.length()).trim();
}
private class URLComparator implements Comparator<URL> {
@Override
public int compare(final URL o1, URL o2) {
return o1.toExternalForm().compareTo(o2.toExternalForm());
}
}
}