/*
* 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.wicket.examples;
import java.net.InetAddress;
import java.net.UnknownHostException;
import org.apache.wicket.request.cycle.RequestCycle;
import org.apache.wicket.response.filter.IResponseFilter;
import org.apache.wicket.util.string.AppendingStringBuffer;
import org.apache.wicket.core.util.string.JavaScriptUtils;
import org.apache.wicket.util.string.Strings;
import org.apache.wicket.util.time.Duration;
/**
* Displays server host name (combination of name, ipaddress and unique id, which is either based)
* and time it took to handle the request in the browser's status bar like this:
* <code>window.defaultStatus = 'Host: myhost/192.168.1.66/someid, handled in: 0.01s'</code>
*
* @author eelco hillenius
*/
public class ServerHostNameAndTimeFilter implements IResponseFilter
{
private String host;
/**
* Construct, trying system property 'examples.hostname' for the server id or else current time
* milis.
*/
public ServerHostNameAndTimeFilter()
{
String hostId = null;
try
{
hostId = System.getProperty("examples.hostname");
}
catch (SecurityException ignored)
{
}
if (Strings.isEmpty(hostId))
{
hostId = String.valueOf(System.currentTimeMillis());
}
setHostName(hostId);
}
/**
* Construct with an id.
*
* @param hostId
* a unique id indentifying this server instance
*/
public ServerHostNameAndTimeFilter(String hostId)
{
if (hostId == null)
{
throw new IllegalArgumentException("hostId may not be null");
}
setHostName(hostId);
}
/**
* @see IResponseFilter#filter(AppendingStringBuffer)
*/
public AppendingStringBuffer filter(AppendingStringBuffer responseBuffer)
{
int index = responseBuffer.indexOf("<head>");
long timeTaken = System.currentTimeMillis() - RequestCycle.get().getStartTime();
if (index != -1)
{
AppendingStringBuffer script = new AppendingStringBuffer(75);
script.append("\n");
script.append(JavaScriptUtils.SCRIPT_OPEN_TAG);
script.append("\n\twindow.defaultStatus='");
script.append("Host: ");
script.append(host);
script.append(", handled in: ");
script.append(Duration.milliseconds(timeTaken));
script.append("';\n");
script.append(JavaScriptUtils.SCRIPT_CLOSE_TAG);
script.append("\n");
responseBuffer.insert(index + 6, script);
}
return responseBuffer;
}
/**
* Fill host name property.
*
* @param hostId
*/
private void setHostName(String hostId)
{
try
{
InetAddress localMachine = InetAddress.getLocalHost();
String hostName = localMachine.getHostName();
String address = localMachine.getHostAddress();
host = ((!Strings.isEmpty(hostName)) ? hostName + "/" + address : address) + "/" +
hostId;
}
catch (UnknownHostException ignored)
{
}
if (Strings.isEmpty(host))
{
host = "<unknown>";
}
}
}