DiameterMuxExtension.java example

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jdiameter-master
package org.mobicents.diameter.extension;

import org.jboss.as.controller.*;
import org.jboss.as.controller.descriptions.StandardResourceDescriptionResolver;
import org.jboss.as.controller.operations.common.GenericSubsystemDescribeHandler;
import org.jboss.as.controller.parsing.ExtensionParsingContext;
import org.jboss.as.controller.parsing.ParseUtils;
import org.jboss.as.controller.persistence.SubsystemMarshallingContext;
import org.jboss.as.controller.registry.ManagementResourceRegistration;
import org.jboss.as.controller.registry.OperationEntry;
import org.jboss.dmr.ModelNode;
import org.jboss.staxmapper.XMLElementReader;
import org.jboss.staxmapper.XMLElementWriter;
import org.jboss.staxmapper.XMLExtendedStreamReader;
import org.jboss.staxmapper.XMLExtendedStreamWriter;

import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import java.util.List;

import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.ADD;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.DESCRIBE;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.OP;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.OP_ADDR;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.SUBSYSTEM;


/**
 * @author <a href="kabir.khan@jboss.com">Kabir Khan</a>
 */
public class DiameterMuxExtension implements Extension {

    /**
     * The name space used for the {@code substystem} element
     */
    public static final String NAMESPACE = "urn:org.restcomm:diameter-mux:1.0";

    /**
     * The name of our subsystem within the model.
     */
    public static final String SUBSYSTEM_NAME = "restcomm-diameter-mux";

    /**
     * The parser used for parsing our subsystem
     */
    private final SubsystemParser parser = new SubsystemParser();

    protected static final PathElement SUBSYSTEM_PATH = PathElement.pathElement(SUBSYSTEM, SUBSYSTEM_NAME);
    private static final String RESOURCE_NAME = DiameterMuxExtension.class.getPackage().getName() + ".LocalDescriptions";

    static StandardResourceDescriptionResolver getResourceDescriptionResolver(final String keyPrefix) {
        String prefix = SUBSYSTEM_NAME + (keyPrefix == null ? "" : "." + keyPrefix);
        return new StandardResourceDescriptionResolver(prefix, RESOURCE_NAME, DiameterMuxExtension.class.getClassLoader(), true, false);
    }

    @Override
    public void initializeParsers(ExtensionParsingContext context) {
        context.setSubsystemXmlMapping(SUBSYSTEM_NAME, NAMESPACE, parser);
    }


    @Override
    public void initialize(ExtensionContext context) {
        final SubsystemRegistration subsystem = context.registerSubsystem(SUBSYSTEM_NAME, 1, 0);
        final ManagementResourceRegistration registration = subsystem.registerSubsystemModel(SubsystemDefinition.INSTANCE);

        final OperationDefinition describeOp = new SimpleOperationDefinitionBuilder(DESCRIBE,
                getResourceDescriptionResolver(null))
                .setEntryType(OperationEntry.EntryType.PRIVATE)
                .build();
        registration.registerOperationHandler(describeOp, GenericSubsystemDescribeHandler.INSTANCE, false);

        subsystem.registerXMLElementWriter(parser);
    }

    private static ModelNode createAddSubsystemOperation() {
        final ModelNode subsystem = new ModelNode();
        subsystem.get(OP).set(ADD);
        subsystem.get(OP_ADDR).add(SUBSYSTEM, SUBSYSTEM_NAME);
        return subsystem;
    }

    /**
     * The subsystem parser, which uses stax to read and write to and from xml
     */
    private static class SubsystemParser implements XMLStreamConstants, XMLElementReader<List<ModelNode>>, XMLElementWriter<SubsystemMarshallingContext> {

        /**
         * {@inheritDoc}
         */
        @Override
        public void writeContent(XMLExtendedStreamWriter writer, SubsystemMarshallingContext context) throws XMLStreamException {
            context.startSubsystemElement(DiameterMuxExtension.NAMESPACE, false);
            writer.writeEndElement();
        }

        /**
         * {@inheritDoc}
         */
        @Override
        public void readElement(XMLExtendedStreamReader reader, List<ModelNode> list) throws XMLStreamException {
            // Require no content
            ParseUtils.requireNoContent(reader);
            list.add(createAddSubsystemOperation());
        }
    }

}