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JMXProxyServlet.javaAPI DocApache Tomcat 6.0.148048Fri Jul 20 04:20:32 BST 2007org.apache.catalina.manager

JMXProxyServlet

public class JMXProxyServlet extends HttpServlet
This servlet will dump JMX attributes in a simple format and implement proxy services for modeler.
author
Costin Manolache

Fields Summary
protected MBeanServer
mBeanServer
MBean server.
protected org.apache.tomcat.util.modeler.Registry
registry
Constructors Summary
Methods Summary
private voidappendHead(java.lang.StringBuffer sb, java.lang.String value, int start, int end)

        if (end < 1) return;

        int pos=start;
        while( end-pos > 78 ) {
            sb.append( value.substring(pos, pos+78));
            sb.append( "\n ");
            pos=pos+78;
        }
        sb.append( value.substring(pos,end));
public voiddoGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)
Process a GET request for the specified resource.

param
request The servlet request we are processing
param
response The servlet response we are creating
exception
IOException if an input/output error occurs
exception
ServletException if a servlet-specified error occurs


        response.setContentType("text/plain");

        PrintWriter writer = response.getWriter();

        if( mBeanServer==null ) {
            writer.println("Error - No mbean server");
            return;
        }

        String qry=request.getParameter("set");
        if( qry!= null ) {
            String name=request.getParameter("att");
            String val=request.getParameter("val");

            setAttribute( writer, qry, name, val );
            return;
        }
        qry=request.getParameter("get");
        if( qry!= null ) {
            String name=request.getParameter("att");
            getAttribute( writer, qry, name );
            return;
        }        
        qry=request.getParameter("qry");
        if( qry == null ) {
            qry = "*:*";
        }

        listBeans( writer, qry );
public java.lang.Stringescape(java.lang.String value)

        // The only invalid char is \n
        // We also need to keep the string short and split it with \nSPACE
        // XXX TODO
        int idx=value.indexOf( "\n" );
        if( idx < 0 ) return value;

        int prev=0;
        StringBuffer sb=new StringBuffer();
        while( idx >= 0 ) {
            appendHead(sb, value, prev, idx);

            sb.append( "\\n\n ");
            prev=idx+1;
            if( idx==value.length() -1 ) break;
            idx=value.indexOf('\n", idx+1);
        }
        if( prev < value.length() )
            appendHead( sb, value, prev, value.length());
        return sb.toString();
public voidgetAttribute(java.io.PrintWriter writer, java.lang.String onameStr, java.lang.String att)

        try {
            ObjectName oname = new ObjectName(onameStr);
            Object value = mBeanServer.getAttribute(oname, att);
            writer.println("OK - Attribute get '" + onameStr + "' - " + att
                    + "= " + escape(value.toString()));
        } catch (Exception ex) {
            writer.println("Error - " + ex.toString());
        }
public voidinit()
Initialize this servlet.

    // --------------------------------------------------------- Public Methods


            
         
        // Retrieve the MBean server
        registry = Registry.getRegistry(null, null);
        mBeanServer = Registry.getRegistry(null, null).getMBeanServer();
public booleanisSupported(java.lang.String type)

        return true;
public voidlistBeans(java.io.PrintWriter writer, java.lang.String qry)


        Set names = null;
        try {
            names=mBeanServer.queryNames(new ObjectName(qry), null);
            writer.println("OK - Number of results: " + names.size());
            writer.println();
        } catch (Exception e) {
            writer.println("Error - " + e.toString());
            return;
        }

        Iterator it=names.iterator();
        while( it.hasNext()) {
            ObjectName oname=(ObjectName)it.next();
            writer.println( "Name: " + oname.toString());

            try {
                MBeanInfo minfo=mBeanServer.getMBeanInfo(oname);
                // can't be null - I thinl
                String code=minfo.getClassName();
                if ("org.apache.commons.modeler.BaseModelMBean".equals(code)) {
                    code=(String)mBeanServer.getAttribute(oname, "modelerType");
                }
                writer.println("modelerType: " + code);

                MBeanAttributeInfo attrs[]=minfo.getAttributes();
                Object value=null;

                for( int i=0; i< attrs.length; i++ ) {
                    if( ! attrs[i].isReadable() ) continue;
                    if( ! isSupported( attrs[i].getType() )) continue;
                    String attName=attrs[i].getName();
                    if( attName.indexOf( "=") >=0 ||
                            attName.indexOf( ":") >=0 ||
                            attName.indexOf( " ") >=0 ) {
                        continue;
                    }
            
                    try {
                        value=mBeanServer.getAttribute(oname, attName);
                    } catch( Throwable t) {
                        log("Error getting attribute " + oname +
                            " " + attName + " " + t.toString());
                        continue;
                    }
                    if( value==null ) continue;
                    if( "modelerType".equals( attName)) continue;
                    String valueString=value.toString();
                    writer.println( attName + ": " + escape(valueString));
                }
            } catch (Exception e) {
                // Ignore
            }
            writer.println();
        }
public voidsetAttribute(java.io.PrintWriter writer, java.lang.String onameStr, java.lang.String att, java.lang.String val)

        try {
            ObjectName oname=new ObjectName( onameStr );
            String type=registry.getType(oname, att);
            Object valueObj=registry.convertValue(type, val );
            mBeanServer.setAttribute( oname, new Attribute(att, valueObj));
            writer.println("OK - Attribute set");
        } catch( Exception ex ) {
            writer.println("Error - " + ex.toString());
        }