javaruntimeportlet.java

jetspeed源代码

/*
 * Copyright 2000-2001,2004 The Apache Software Foundation.
 * 
 * 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 org.apache.jetspeed.portal.portlets.admin;

//Element Construction Set
import org.apache.ecs.html.Table;
import org.apache.ecs.html.TD;
import org.apache.ecs.html.TR;
import org.apache.ecs.ConcreteElement;

//Jetspeed stuff
import org.apache.jetspeed.portal.portlets.AbstractPortlet;
import org.apache.jetspeed.portal.PortletException;
import org.apache.jetspeed.services.logging.JetspeedLogFactoryService;
import org.apache.jetspeed.services.logging.JetspeedLogger;

//turbine
import org.apache.turbine.util.RunData;

//standard java stuff
import java.util.Enumeration;
import java.util.Properties;

/**
Handles enumerating Portlets that are also applications

@author <a href="mailto:[e-mail]">Kevin A. Burton</a>
@version $Id: JavaRuntimePortlet.java,v 1.18 2004/02/23 03:26:19 jford Exp $ 
*/
public class JavaRuntimePortlet extends AbstractPortlet 
{

    /**
     * Static initialization of the logger for this class
     */    
    private static final JetspeedLogger logger = JetspeedLogFactoryService.getLogger(JavaRuntimePortlet.class.getName());
    
    public ConcreteElement getContent( RunData rundata ) {

        Table table = new Table().setWidth("100%");

        try {
            //get Runtime status
            Runtime jvm = Runtime.getRuntime();
        
            table.addElement( new TR()
                .addElement( new TD("Free Memory (in bytes)") )
                .addElement( new TD( Long.toString( jvm.freeMemory() ) ) ) );
        
            table.addElement( new TR()
                .addElement( new TD("Total Memory (in bytes)") )
                .addElement( new TD( Long.toString( jvm.totalMemory() ) ) ) );

            //get the system properties (It can throw a SecurityException)
            Properties props = System.getProperties();
        
            Enumeration enum = props.propertyNames();
            while( enum.hasMoreElements() ) {
                Object key = enum.nextElement();
                if ( ! ( key instanceof String ) ) {
                    continue;
                }

                Object value = props.getProperty( key.toString() );
                table.addElement( new TR()
                    .addElement( new TD( key.toString() ) )
                    .addElement( new TD( value.toString() ) ) );
            
            }
        } catch (Throwable t) {
            logger.error("Throwable",  t);
            table.addElement( new TR()
                .addElement( new TD( "Error" ) )
                .addElement( new TD( "Could not read system properties" ) ) );
        }

        return table;
    }
    
    /**
    @author <a href="mailto:[e-mail]">Kevin A. Burton</a>
    @version $Id: JavaRuntimePortlet.java,v 1.18 2004/02/23 03:26:19 jford Exp $ 
    */
    public void init() throws PortletException {

        this.setTitle("Java Runtime");
        this.setDescription("Information about your Java Runtime");

    }

    public boolean getAllowEdit(RunData rundata) {
        return false;
    }

    public boolean getAllowMaximize(RunData rundata) {
        return false;
    }
    
    
}