org.archive.io.LoudObjectOutputStream Maven / Gradle / Ivy
/*
* This file is part of the Heritrix web crawler (crawler.archive.org).
*
* Licensed to the Internet Archive (IA) by one or more individual
* contributors.
*
* The IA 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.archive.io;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Logger;
/**
* ObjectOutputStream that logs class name of each object that is written
* to the stream. Useful for tracking down sources of NotSerializableException.
*
* @author pjack
*
*/
public class LoudObjectOutputStream extends ObjectOutputStream {
final private static Logger LOGGER = Logger.getLogger(
LoudObjectOutputStream.class.getName());
// Only log each class name once
private Set alreadyLogged = new HashSet();
public LoudObjectOutputStream(OutputStream out) throws IOException {
super(out);
this.enableReplaceObject(true);
}
@Override
protected Object replaceObject(Object obj) throws IOException {
if (obj != null) {
String name = obj.getClass().getName();
if (alreadyLogged.add(name)) {
LOGGER.info("WROTE: " + name);
}
}
return obj;
}
}