/// <exception cref="Javax.Servlet.ServletException"/>
/// <exception cref="System.IO.IOException"/>
protected override void DoGet(HttpServletRequest req, HttpServletResponse resp)
{
Log.Info("GET");
resp.SetContentType("text/html");
PrintWriter @out = resp.GetWriter();
Reconfigurable reconf = GetReconfigurable(req);
string nodeName = reconf.GetType().GetCanonicalName();
PrintHeader(@out, nodeName);
PrintConf(@out, reconf);
PrintFooter(@out);
}
/// <summary>Print configuration options that can be changed.</summary>
private void PrintConf(PrintWriter @out, Reconfigurable reconf)
{
Configuration oldConf = reconf.GetConf();
Configuration newConf = new Configuration();
ICollection <ReconfigurationUtil.PropertyChange> changes = ReconfigurationUtil.GetChangedProperties
(newConf, oldConf);
bool changeOK = true;
@out.WriteLine("<form action=\"\" method=\"post\">");
@out.WriteLine("<table border=\"1\">");
@out.WriteLine("<tr><th>Property</th><th>Old value</th>");
@out.WriteLine("<th>New value </th><th></th></tr>");
foreach (ReconfigurationUtil.PropertyChange c in changes)
{
@out.Write("<tr><td>");
if (!reconf.IsPropertyReconfigurable(c.prop))
{
@out.Write("<font color=\"red\">" + StringEscapeUtils.EscapeHtml(c.prop) + "</font>"
);
changeOK = false;
}
else
{
@out.Write(StringEscapeUtils.EscapeHtml(c.prop));
@out.Write("<input type=\"hidden\" name=\"" + StringEscapeUtils.EscapeHtml(c.prop
) + "\" value=\"" + StringEscapeUtils.EscapeHtml(c.newVal) + "\"/>");
}
@out.Write("</td><td>" + (c.oldVal == null ? "<it>default</it>" : StringEscapeUtils
.EscapeHtml(c.oldVal)) + "</td><td>" + (c.newVal == null ? "<it>default</it>" :
StringEscapeUtils.EscapeHtml(c.newVal)) + "</td>");
@out.Write("</tr>\n");
}
@out.WriteLine("</table>");
if (!changeOK)
{
@out.WriteLine("<p><font color=\"red\">WARNING: properties marked red" + " will not be changed until the next restart.</font></p>"
);
}
@out.WriteLine("<input type=\"submit\" value=\"Apply\" />");
@out.WriteLine("</form>");
}
/// <exception cref="Javax.Servlet.ServletException"/>
/// <exception cref="System.IO.IOException"/>
protected override void DoPost(HttpServletRequest req, HttpServletResponse resp)
{
Log.Info("POST");
resp.SetContentType("text/html");
PrintWriter @out = resp.GetWriter();
Reconfigurable reconf = GetReconfigurable(req);
string nodeName = reconf.GetType().GetCanonicalName();
PrintHeader(@out, nodeName);
try
{
ApplyChanges(@out, reconf, req);
}
catch (ReconfigurationException e)
{
resp.SendError(HttpServletResponse.ScInternalServerError, StringUtils.StringifyException
(e));
return;
}
@out.WriteLine("<p><a href=\"" + req.GetServletPath() + "\">back</a></p>");
PrintFooter(@out);
}
/// <summary>Apply configuratio changes after admin has approved them.</summary>
/// <exception cref="Org.Apache.Hadoop.Conf.ReconfigurationException"/>
private void ApplyChanges(PrintWriter @out, Reconfigurable reconf, HttpServletRequest
req)
{
Configuration oldConf = reconf.GetConf();
Configuration newConf = new Configuration();
Enumeration <string> @params = GetParams(req);
lock (oldConf)
{
while (@params.MoveNext())
{
string rawParam = @params.Current;
string param = StringEscapeUtils.UnescapeHtml(rawParam);
string value = StringEscapeUtils.UnescapeHtml(req.GetParameter(rawParam));
if (value != null)
{
if (value.Equals(newConf.GetRaw(param)) || value.Equals("default") || value.Equals
("null") || value.IsEmpty())
{
if ((value.Equals("default") || value.Equals("null") || value.IsEmpty()) && oldConf
.GetRaw(param) != null)
{
@out.WriteLine("<p>Changed \"" + StringEscapeUtils.EscapeHtml(param) + "\" from \""
+ StringEscapeUtils.EscapeHtml(oldConf.GetRaw(param)) + "\" to default</p>");
reconf.ReconfigureProperty(param, null);
}
else
{
if (!value.Equals("default") && !value.Equals("null") && !value.IsEmpty() && (oldConf
.GetRaw(param) == null || !oldConf.GetRaw(param).Equals(value)))
{
// change from default or value to different value
if (oldConf.GetRaw(param) == null)
{
@out.WriteLine("<p>Changed \"" + StringEscapeUtils.EscapeHtml(param) + "\" from default to \""
+ StringEscapeUtils.EscapeHtml(value) + "\"</p>");
}
else
{
@out.WriteLine("<p>Changed \"" + StringEscapeUtils.EscapeHtml(param) + "\" from \""
+ StringEscapeUtils.EscapeHtml(oldConf.GetRaw(param)) + "\" to \"" + StringEscapeUtils
.EscapeHtml(value) + "\"</p>");
}
reconf.ReconfigureProperty(param, value);
}
else
{
Log.Info("property " + param + " unchanged");
}
}
}
else
{
// parameter value != newConf value
@out.WriteLine("<p>\"" + StringEscapeUtils.EscapeHtml(param) + "\" not changed because value has changed from \""
+ StringEscapeUtils.EscapeHtml(value) + "\" to \"" + StringEscapeUtils.EscapeHtml
(newConf.GetRaw(param)) + "\" since approval</p>");
}
}
}
}
}
