WeldExtension.java example

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wildfly-master
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 * as indicated by the @author tags. See the copyright.txt file in the
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 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
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 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
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 * License along with this software; if not, write to the Free
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 */

package org.jboss.as.weld;

import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.SUBSYSTEM;

import java.util.Map;

import org.jboss.as.controller.Extension;
import org.jboss.as.controller.ExtensionContext;
import org.jboss.as.controller.ModelVersion;
import org.jboss.as.controller.PathAddress;
import org.jboss.as.controller.PathElement;
import org.jboss.as.controller.SubsystemRegistration;
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.registry.ManagementResourceRegistration;
import org.jboss.as.controller.transform.TransformationContext;
import org.jboss.as.controller.transform.description.ChainedTransformationDescriptionBuilder;
import org.jboss.as.controller.transform.description.DiscardAttributeChecker;
import org.jboss.as.controller.transform.description.RejectAttributeChecker;
import org.jboss.as.controller.transform.description.ResourceTransformationDescriptionBuilder;
import org.jboss.as.controller.transform.description.TransformationDescriptionBuilder;
import org.jboss.as.weld.logging.WeldLogger;
import org.jboss.dmr.ModelNode;

/**
 * Domain extension used to initialize the weld subsystem.
 *
 * @author Stuart Douglas
 * @author Emanuel Muckenhuber
 * @author Jozef Hartinger
 */
public class WeldExtension implements Extension {

    public static final String SUBSYSTEM_NAME = "weld";

    static final PathElement PATH_SUBSYSTEM = PathElement.pathElement(SUBSYSTEM, SUBSYSTEM_NAME);


    private static final String RESOURCE_NAME = WeldExtension.class.getPackage().getName() + ".LocalDescriptions";

    private static final ModelVersion CURRENT_MODEL_VERSION = ModelVersion.create(4, 0, 0);

    static StandardResourceDescriptionResolver getResourceDescriptionResolver(final String... keyPrefix) {
        StringBuilder prefix = new StringBuilder(SUBSYSTEM_NAME);
        for (String kp : keyPrefix) {
            prefix.append('.').append(kp);
        }
        return new StandardResourceDescriptionResolver(prefix.toString(), RESOURCE_NAME, WeldExtension.class.getClassLoader(), true, false);
    }

    /** {@inheritDoc} */
    @Override
    public void initialize(final ExtensionContext context) {
        WeldLogger.ROOT_LOGGER.debug("Activating Weld Extension");
        final SubsystemRegistration subsystem = context.registerSubsystem(SUBSYSTEM_NAME, CURRENT_MODEL_VERSION);
        final ManagementResourceRegistration registration = subsystem.registerSubsystemModel(WeldResourceDefinition.INSTANCE);
        registration.registerOperationHandler(GenericSubsystemDescribeHandler.DEFINITION, GenericSubsystemDescribeHandler.INSTANCE);
        subsystem.registerXMLElementWriter(WeldSubsystem40Parser.INSTANCE);

        if (context.isRegisterTransformers()) {
            registerTransformers(subsystem);
        }
    }

    /** {@inheritDoc} */
    @Override
    public void initializeParsers(final ExtensionParsingContext context) {
        context.setSubsystemXmlMapping(SUBSYSTEM_NAME, WeldSubsystem10Parser.NAMESPACE, () -> WeldSubsystem10Parser.INSTANCE);
        context.setSubsystemXmlMapping(SUBSYSTEM_NAME, WeldSubsystem20Parser.NAMESPACE, () -> WeldSubsystem20Parser.INSTANCE);
        context.setSubsystemXmlMapping(SUBSYSTEM_NAME, WeldSubsystem30Parser.NAMESPACE, () -> WeldSubsystem30Parser.INSTANCE);
        context.setSubsystemXmlMapping(SUBSYSTEM_NAME, WeldSubsystem40Parser.NAMESPACE, () -> WeldSubsystem40Parser.INSTANCE);
    }

    private void registerTransformers(SubsystemRegistration subsystem) {
        ModelVersion version1_0_0 = ModelVersion.create(1, 0, 0);
        ModelVersion version3_0_0 = ModelVersion.create(3, 0, 0);

        ChainedTransformationDescriptionBuilder chainedBuilder = TransformationDescriptionBuilder.Factory
                .createChainedSubystemInstance(subsystem.getSubsystemVersion());

        // Differences between the current version and 3.0.0
        ResourceTransformationDescriptionBuilder builder300 = chainedBuilder.createBuilder(subsystem.getSubsystemVersion(), version3_0_0);
        builder300.getAttributeBuilder().setDiscard(DiscardAttributeChecker.UNDEFINED, WeldResourceDefinition.THREAD_POOL_SIZE_ATTRIBUTE)
                // Reject thread-pool-size attribute if defined
                .addRejectCheck(RejectAttributeChecker.DEFINED, WeldResourceDefinition.THREAD_POOL_SIZE_ATTRIBUTE).end();

        // Differences between 3.0.0 and 1.0.0
        ResourceTransformationDescriptionBuilder builder100 = chainedBuilder.createBuilder(version3_0_0, version1_0_0);
        builder100.getAttributeBuilder()
                // These new attributes are assumed to be 'true' in the old version but default to false in the current version. So discard if 'true' and reject
                // if 'undefined'.
                .setDiscard(new DiscardAttributeChecker.DiscardAttributeValueChecker(false, false, new ModelNode(true)),
                        WeldResourceDefinition.NON_PORTABLE_MODE_ATTRIBUTE, WeldResourceDefinition.REQUIRE_BEAN_DESCRIPTOR_ATTRIBUTE)
                .addRejectCheck(new RejectAttributeChecker.DefaultRejectAttributeChecker() {

                    @Override
                    public String getRejectionLogMessage(Map<String, ModelNode> attributes) {
                        return WeldLogger.ROOT_LOGGER.rejectAttributesMustBeTrue(attributes.keySet());
                    }

                    @Override
                    protected boolean rejectAttribute(PathAddress address, String attributeName, ModelNode attributeValue, TransformationContext context) {
                        // This will not get called if it was discarded, so reject if it is undefined (default==false) or if defined and != 'true'
                        return !attributeValue.isDefined() || !attributeValue.asString().equals("true");
                    }
                }, WeldResourceDefinition.NON_PORTABLE_MODE_ATTRIBUTE, WeldResourceDefinition.REQUIRE_BEAN_DESCRIPTOR_ATTRIBUTE)

                // development mode - not supported in older versions
                .setDiscard(new DiscardAttributeChecker.DiscardAttributeValueChecker(new ModelNode(false)), WeldResourceDefinition.DEVELOPMENT_MODE_ATTRIBUTE)
                // if the attribute was not discarded it means that it is defined as 'true'. Therefore, reject.
                .addRejectCheck(RejectAttributeChecker.DEFINED, WeldResourceDefinition.DEVELOPMENT_MODE_ATTRIBUTE).end();

        chainedBuilder.buildAndRegister(subsystem, new ModelVersion[] { version1_0_0, version3_0_0 });
    }
}