Sun Java System Application Server Platform Edition 8.1 2005Q2 Update 2 Developer's Guide

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## Displaying the AMX MBean Hierarchy

The `displayAMX()` method demonstrates how to display the AMX MBean hierarchy.

##### Example 16–6 Displaying the AMX MBean Hierarchy

    [...]
    displayAMX(
        final AMX amx,
        final int indentCount )
    {
        final String indent = getIndent( indentCount );
        final String j2eeType = amx.getJ2EEType();
        final String name = amx.getName();
        if ( name.equals( AMX.NO_NAME ) )
        {
            println( indent + j2eeType );
        }
        else
        {
            println( indent + j2eeType + "=" + name );
        }
    }
    private void
    displayHierarchy(
        final Collection amxSet,
        final int indentCount )
    {
        final Iterator    iter    = amxSet.iterator();
        while ( iter.hasNext() )
        {
            final AMX amx = (AMX)iter.next();
            displayHierarchy( amx, indentCount );
        }
    }
    public void
    displayHierarchy(
        final AMX amx,
        final int    indentCount )
    {
        displayAMX( amx, indentCount );
        if ( amx instanceof Container )
        {
            final Map m = ((Container)amx).getMultiContaineeMap( null );
            final Set deferred = new HashSet();
            final Iterator mapsIter = m.values().iterator();
            while ( mapsIter.hasNext() )
            {
                final Map instancesMap = (Map)mapsIter.next();
                final AMX first = (AMX)instancesMap.values().iterator().next();
                if ( first instanceof Container )
                {
                    deferred.add( instancesMap );
                }
                else
                {
                    displayHierarchy( instancesMap.values(), indentCount + 2);
                }
            }
            // display deferred items
            final Iterator iter = deferred.iterator();
            while ( iter.hasNext() )
            {
                final Map instancesMap = (Map)iter.next();
                displayHierarchy( instancesMap.values(), indentCount + 2);
            }
        }
    }
    public void displayHierarchy()
    {
        displayHierarchy( getDomainRoot(), 0);
    }
    public void
    displayHierarchy( final String j2eeType )
    {
        final Set items = getQueryMgr().queryJ2EETypeSet( j2eeType );
        if ( items.size() == 0 )
        {
            println( "No {@link AMX} of j2eeType "
                + SampleUtil.quote( j2eeType ) + " found" );
        }
        else
        {
            displayHierarchy( items, 0);
        }
    }
    [...]

The `displayAMX()` method obtains the J2EE type and the name of an AMX MBean by calling `AMX.getJ2EEType` and `AMX.getName` respectively.

The `displayHierarchy()` method defines a standard Java `Collection` instance, `amxSet`, which collects instances of AMX MBeans.

To display the hierarchy of MBeans within a particular MBean in the collection, `displayHierarchy()` checks whether the MBean is an instance of `Container`. If so, it creates a set of the MBeans it contains by calling the `com.sun.appserv.management.base.Container.getMultiContaineeMap()` method.

The MBean hierarchy for a particular J2EE type is displayed by calling the `com.sun.appserv.management.base.QueryMgr.queryJ2EETypeSet()`, and passing the result to `displayHierarchy()`.

To display the entire AMX MBean hierarchy in a domain, `displayHierarchy()` calls `getDomainRoot()` to obtain the root AMX MBean in the domain.

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