ClassifierDefinitionListener.java

/*
 * Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */

package org.opendaylight.groupbasedpolicy.renderer.iovisor.sf;

import static com.google.common.base.Preconditions.checkNotNull;

import org.opendaylight.controller.md.sal.binding.api.DataBroker;
import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
import org.opendaylight.controller.md.sal.binding.api.DataTreeIdentifier;
import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
import org.opendaylight.groupbasedpolicy.renderer.iovisor.IovisorRenderer;
import org.opendaylight.groupbasedpolicy.util.DataTreeChangeHandler;
import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.policy.rev140421.SubjectFeatureDefinitions;
import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.policy.rev140421.subject.feature.definitions.ClassifierDefinition;
import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.renderer.rev151103.Renderers;
import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.renderer.rev151103.renderers.Renderer;
import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.renderer.rev151103.renderers.RendererKey;
import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.renderer.rev151103.renderers.renderer.Capabilities;
import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.renderer.rev151103.renderers.renderer.capabilities.SupportedClassifierDefinition;
import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.renderer.rev151103.renderers.renderer.capabilities.SupportedClassifierDefinitionBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.renderer.rev151103.renderers.renderer.capabilities.SupportedClassifierDefinitionKey;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;

public class ClassifierDefinitionListener extends DataTreeChangeHandler<ClassifierDefinition> {

    private static final Logger LOG = LoggerFactory.getLogger(ClassifierDefinitionListener.class);

    private static final String PUT = "stored";
    private static final String DELETED = "removed";

    private static final InstanceIdentifier<Capabilities> CAPABILITIES_IID = InstanceIdentifier.builder(Renderers.class)
        .child(Renderer.class, new RendererKey(IovisorRenderer.RENDERER_NAME))
        .child(Capabilities.class)
        .build();

    public ClassifierDefinitionListener(DataBroker dataBroker) {
        super(dataBroker);
        registerDataTreeChangeListener(new DataTreeIdentifier<>(LogicalDatastoreType.CONFIGURATION,
                InstanceIdentifier.builder(SubjectFeatureDefinitions.class).child(ClassifierDefinition.class).build()));
    }

    private SupportedClassifierDefinition createSupportedClassifierDefinition(Classifier classifier) {
        SupportedClassifierDefinitionBuilder scdBuilder =
                new SupportedClassifierDefinitionBuilder().setClassifierDefinitionId(classifier.getId())
                    .setSupportedParameterValues(classifier.getSupportedParameterValues());
        if (classifier.getParent() != null) {
            scdBuilder.setParentClassifierDefinitionId(classifier.getParent().getId());
        }
        return scdBuilder.build();
    }

    private FutureCallback<Void> logDebugResult(final SupportedClassifierDefinitionKey supportedClassifierDefinitionKey,
            final String putOrDeleted) {
        return new FutureCallback<Void>() {

            @Override
            public void onSuccess(Void result) {
                LOG.debug("Capability of renerer {} was {}: {}", IovisorRenderer.RENDERER_NAME.getValue(), putOrDeleted,
                        supportedClassifierDefinitionKey.getClassifierDefinitionId().getValue());
            }

            @Override
            public void onFailure(Throwable t) {
                LOG.error("Capability of renderer {} was NOT {}: {}", IovisorRenderer.RENDERER_NAME.getValue(),
                        putOrDeleted, supportedClassifierDefinitionKey.getClassifierDefinitionId().getValue(), t);
            }
        };
    }

    @Override
    protected void onWrite(DataObjectModification<ClassifierDefinition> rootNode,
            InstanceIdentifier<ClassifierDefinition> rootIdentifier) {
        onSubtreeModified(rootNode, rootIdentifier);
    }

    @Override
    protected void onDelete(DataObjectModification<ClassifierDefinition> rootNode,
            InstanceIdentifier<ClassifierDefinition> rootIdentifier) {
        ClassifierDefinition classifierDefinitionBefore = checkNotNull(rootNode.getDataBefore());
        Classifier ourClassifier = SubjectFeatures.getClassifier(classifierDefinitionBefore.getId());
        if (ourClassifier != null) {
            SupportedClassifierDefinitionKey supportedClassifierDefinitionKey =
                    new SupportedClassifierDefinitionKey(ourClassifier.getId());
            WriteTransaction wTx = dataProvider.newWriteOnlyTransaction();

            wTx.delete(LogicalDatastoreType.OPERATIONAL,
                    CAPABILITIES_IID.child(SupportedClassifierDefinition.class, supportedClassifierDefinitionKey));
            Futures.addCallback(wTx.submit(), logDebugResult(supportedClassifierDefinitionKey, DELETED));
        }
    }

    @Override
    protected void onSubtreeModified(DataObjectModification<ClassifierDefinition> rootNode,
            InstanceIdentifier<ClassifierDefinition> rootIdentifier) {
        ClassifierDefinition classifierDefinitionAfter = checkNotNull(rootNode.getDataAfter());
        Classifier ourClassifier = SubjectFeatures.getClassifier(classifierDefinitionAfter.getId());
        if (ourClassifier != null) {
            SupportedClassifierDefinition supportedClassifierDefinition =
                    createSupportedClassifierDefinition(ourClassifier);
            WriteTransaction wTx = dataProvider.newWriteOnlyTransaction();
            wTx.put(LogicalDatastoreType.OPERATIONAL,
                    CAPABILITIES_IID.child(SupportedClassifierDefinition.class, supportedClassifierDefinition.getKey()),
                    supportedClassifierDefinition, true);
            Futures.addCallback(wTx.submit(), logDebugResult(supportedClassifierDefinition.getKey(), PUT));
        }
    }
}