psmith 2004/06/14 15:55:51
Added: src/java/org/apache/log4j/chainsaw/plugins
PluginClassLoaderFactory.java
Log:
An initial attempt to work around some classloader issues within Web start. This
classloader
will be able to reference jars & classes etc in a sub-directory of a users chainsaw
home directory.
Hopefully this will allow things like the weblogic.jar to be referenced, but I have
not completed formal testing
at this stage, but it does not have any impact on existing functionality so it seems
safe to commit it
in it's current state. (touching wood).
Revision Changes Path
1.1
logging-log4j/src/java/org/apache/log4j/chainsaw/plugins/PluginClassLoaderFactory.java
Index: PluginClassLoaderFactory.java
===================================================================
package org.apache.log4j.chainsaw.plugins;
import java.io.File;
import java.io.FilenameFilter;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.List;
import org.apache.log4j.helpers.LogLog;
/**
* A factory class to create a Classloader that can refenerence
jars/classes/resources
* within a users plugin directory.
*
* Currently a work in progress to see if this allows external jars required by
* some 3rd party vendors for things like the JMSReceiver.
*
* @author psmith
*
*
*/
public class PluginClassLoaderFactory {
/**
* @param urls
*/
private PluginClassLoaderFactory() {
}
/**
* Creates a Classloader that will be able to access any of the classes found
* in any .JAR file contained within the specified directory path, PLUS
* the actual Plugin directory itself, so it acts like the WEB-INF/classes
directory,
* any class file in the directory will be accessible
*
* @param pluginDirectory
* @throws IllegalArgumentException if the pluginDirectory is null, does not
exist, or cannot be read
* @throws RuntimeException if turning a File into a URL failed, which would be
very unexpected
* @return
*/
public static final ClassLoader create(File pluginDirectory) {
if(pluginDirectory == null || !pluginDirectory.exists() ||
!pluginDirectory.canRead()) {
throw new IllegalArgumentException("pluginDirectory cannot be null, and it
must exist and must be readable");
}
String[] strings = pluginDirectory.list(new FilenameFilter() {
public boolean accept(File dir, String name) {
return name.toUpperCase().endsWith(".JAR");
}});
List list = new ArrayList();
// add the plugin directory as a resource loading path
try {
list.add(pluginDirectory.toURL());
} catch (Exception e) {
throw new RuntimeException(e);
}
if (strings !=null) {
for (int i = 0; i < strings.length; i++) {
String name = strings[i];
File file = new File(pluginDirectory, name);
try {
list.add(file.toURL());
LogLog.info("Added " + file.getAbsolutePath()
+ " to Plugin class loader
list");
} catch (Exception e) {
LogLog.error("Failed to retrieve the URL for
file: "
+ file.getAbsolutePath());
throw new RuntimeException(e);
}
}
}
URL[] urls = (URL[]) list.toArray(new URL[list.size()]);
return new URLClassLoader(urls);
}
}
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