/*
* Copyright 2002-2005 the original author or authors.
*
* 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 info.jtrac.wicket.devmode;
import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import org.apache.wicket.Application;
import org.apache.wicket.Request;
import org.apache.wicket.protocol.http.HttpSessionStore;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* this is a custom session store for development mode that just extends the wicket
* http session store but is designed to warn of anything encountered that is
* not-serializable, see this wicket mail discussion thread:
*
* http://www.nabble.com/Page-serialization-and-reloading-don%27t-get-on-td15574828.html#a15574828
*
* As a bonus, we log the size of each item serialized so that we get an idea
* if anything is bloated and needs optimization
*/
public class DebugHttpSessionStore extends HttpSessionStore {
private static final Logger logger = LoggerFactory.getLogger(DebugHttpSessionStore.class);
private static final String banner =
"\n***********************************************\n"
+ "*** WARNING: Debug HttpSession store in use ***\n"
+ "*** This is wrong if production mode. ***\n"
+ "***********************************************";
public DebugHttpSessionStore(Application application) {
super(application);
logger.warn(banner);
}
@Override
public void setAttribute(Request request, String name, Object value) {
try {
ByteArrayOutputStream os = new ByteArrayOutputStream();
ObjectOutputStream stream = new ObjectOutputStream(os);
stream.writeObject(value);
stream.close();
logger.debug(os.size() + " bytes: " + name + " [" + value.getClass().getName() + "]");
} catch (Exception e) {
logger.error("serialization failed for name: " + name + ", class: " + value.getClass(), e);
// throw Error so that we sit up and take notice
throw new Error("Unable to serialize value: ", e);
}
super.setAttribute(request, name, value);
}
}