/*
 * Copyright (c) 2013 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.bgpcep.pcep.tunnel.provider;

import com.google.common.base.Function;
import com.google.common.base.Optional;
import com.google.common.base.Preconditions;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.ExecutionException;
import org.opendaylight.bgpcep.pcep.topology.spi.AbstractInstructionExecutor;
import org.opendaylight.bgpcep.programming.spi.InstructionScheduler;
import org.opendaylight.bgpcep.programming.spi.SuccessfulRpcResult;
import org.opendaylight.bgpcep.programming.topology.TopologyProgrammingUtil;
import org.opendaylight.bgpcep.programming.tunnel.TunnelProgrammingUtil;
import org.opendaylight.controller.md.sal.binding.api.DataBroker;
import org.opendaylight.controller.md.sal.binding.api.ReadTransaction;
import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.IpAddress;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.AdministrativeStatus;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.Arguments2;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.Arguments2Builder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.Arguments3;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.Arguments3Builder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.PcepCreateP2pTunnelInput1;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.PcepUpdateTunnelInput1;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.ietf.stateful.rev131222.lsp.object.LspBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.bandwidth.object.BandwidthBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.classtype.object.ClassTypeBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.endpoints.AddressFamily;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.endpoints.address.family.Ipv4CaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.endpoints.address.family.Ipv6CaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.endpoints.address.family.ipv4._case.Ipv4Builder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.endpoints.address.family.ipv6._case.Ipv6Builder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.endpoints.object.EndpointsObjBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.explicit.route.object.Ero;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.explicit.route.object.EroBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.explicit.route.object.ero.Subobject;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.explicit.route.object.ero.SubobjectBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.lspa.object.LspaBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.pcep.rev131024.AddLspInputBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.pcep.rev131024.AddLspOutput;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.pcep.rev131024.FailureType;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.pcep.rev131024.NetworkTopologyPcepService;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.pcep.rev131024.OperationResult;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.pcep.rev131024.RemoveLspInputBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.pcep.rev131024.RemoveLspOutput;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.pcep.rev131024.UpdateLspInputBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.pcep.rev131024.UpdateLspOutput;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.pcep.rev131024.add.lsp.args.ArgumentsBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.pcep.rev131024.operation.result.Error;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.tunnel.p2p.rev130819.tunnel.p2p.path.cfg.attributes.ExplicitHops;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.tunnel.pcep.programming.rev131030.PcepCreateP2pTunnelInput;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.tunnel.pcep.programming.rev131030.PcepCreateP2pTunnelOutput;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.tunnel.pcep.programming.rev131030.PcepCreateP2pTunnelOutputBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.tunnel.pcep.programming.rev131030.PcepDestroyTunnelInput;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.tunnel.pcep.programming.rev131030.PcepDestroyTunnelOutput;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.tunnel.pcep.programming.rev131030.PcepDestroyTunnelOutputBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.tunnel.pcep.programming.rev131030.PcepUpdateTunnelInput;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.tunnel.pcep.programming.rev131030.PcepUpdateTunnelOutput;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.tunnel.pcep.programming.rev131030.PcepUpdateTunnelOutputBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.tunnel.pcep.programming.rev131030.TopologyTunnelPcepProgrammingService;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.tunnel.pcep.rev130820.ExplicitHops1;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.tunnel.pcep.rev130820.Link1;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.tunnel.pcep.rev130820.SupportingNode1;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.tunnel.programming.rev130930.TpReference;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NodeId;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Link;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.NodeKey;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.node.TerminationPoint;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.node.TerminationPointKey;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.node.attributes.SupportingNode;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.nt.l3.unicast.igp.topology.rev131021.TerminationPoint1;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.nt.l3.unicast.igp.topology.rev131021.igp.termination.point.attributes.igp.termination.point.attributes.TerminationPointType;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.nt.l3.unicast.igp.topology.rev131021.igp.termination.point.attributes.igp.termination.point.attributes.termination.point.type.Ip;
import org.opendaylight.yangtools.yang.binding.DataContainer;
import org.opendaylight.yangtools.yang.binding.DataObject;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.opendaylight.yangtools.yang.common.RpcResult;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public final class TunnelProgramming implements TopologyTunnelPcepProgrammingService, AutoCloseable {
    private static final Logger LOG = LoggerFactory.getLogger(TunnelProgramming.class);
    private final NetworkTopologyPcepService topologyService;
    private final DataBroker dataProvider;
    private final InstructionScheduler scheduler;

    public TunnelProgramming(final InstructionScheduler scheduler, final DataBroker dataProvider,
            final NetworkTopologyPcepService topologyService) {
        this.scheduler = Preconditions.checkNotNull(scheduler);
        this.dataProvider = Preconditions.checkNotNull(dataProvider);
        this.topologyService = Preconditions.checkNotNull(topologyService);
    }

    private static final class TpReader {
        private final ReadTransaction t;
        private final InstanceIdentifier<Node> nii;
        private final InstanceIdentifier<TerminationPoint> tii;

        TpReader(final ReadTransaction t, final InstanceIdentifier<Topology> topo, final TpReference ref) {
            this.t = Preconditions.checkNotNull(t);

            this.nii = topo.child(Node.class, new NodeKey(ref.getNode()));
            this.tii = this.nii.child(TerminationPoint.class, new TerminationPointKey(ref.getTp()));
        }

        private DataObject read(final InstanceIdentifier<?> id) {
            try {
                return this.t.read(LogicalDatastoreType.OPERATIONAL, this.nii).get().get();
            } catch (InterruptedException | ExecutionException e) {
                throw new IllegalStateException("Failed to read " + id, e);
            }
        }

        private Node getNode() {
            return (Node) read(this.nii);
        }

        private TerminationPoint getTp() {
            return (TerminationPoint) read(this.tii);
        }
    }

    private AddressFamily buildAddressFamily(final TerminationPoint sp, final TerminationPoint dp) {
        // We need the IGP augmentation -- it has IP addresses
        final TerminationPoint1 sp1 = Preconditions.checkNotNull(sp.getAugmentation(TerminationPoint1.class));
        final TerminationPoint1 dp1 = Preconditions.checkNotNull(dp.getAugmentation(TerminationPoint1.class));

        // Get the types
        final TerminationPointType spt = sp1.getIgpTerminationPointAttributes().getTerminationPointType();
        final TerminationPointType dpt = dp1.getIgpTerminationPointAttributes().getTerminationPointType();

        // The types have to match
        Preconditions.checkArgument(spt.getImplementedInterface().equals(dpt.getImplementedInterface()));

        // And they have to actually be Ip
        final Ip sips = (Ip) spt;
        final Ip dips = (Ip) dpt;

        /*
         * Now a bit of magic. We need to find 'like' addresses, e.g. both
         * IPv4 or both IPv6. We are in IPv6-enabled world now, so let's
         * prefer that.
         */
        AddressFamily ret = findIpv6(sips.getIpAddress(), dips.getIpAddress());
        if (ret == null) {
            ret = findIpv4(sips.getIpAddress(), dips.getIpAddress());
        }

        // We need to have a ret now
        Preconditions.checkArgument(ret != null, "Failed to find like Endpoint addresses");

        return ret;
    }

    private AddressFamily findIpv4(final List<IpAddress> srcs, final List<IpAddress> dsts) {
        for (final IpAddress sc : srcs) {
            if (sc.getIpv4Address() != null) {
                for (final IpAddress dc : dsts) {
                    if (dc.getIpv4Address() != null) {
                        return new Ipv4CaseBuilder().setIpv4(
                                new Ipv4Builder().setSourceIpv4Address(sc.getIpv4Address()).setDestinationIpv4Address(dc.getIpv4Address()).build()).build();
                    }
                }
            }
        }

        return null;
    }

    private AddressFamily findIpv6(final List<IpAddress> srcs, final List<IpAddress> dsts) {
        for (final IpAddress sc : srcs) {
            if (sc.getIpv6Address() != null) {
                for (final IpAddress dc : dsts) {
                    if (dc.getIpv6Address() != null) {
                        return new Ipv6CaseBuilder().setIpv6(
                                new Ipv6Builder().setSourceIpv6Address(sc.getIpv6Address()).setDestinationIpv6Address(dc.getIpv6Address()).build()).build();
                    }
                }
            }
        }

        return null;
    }

    private NodeId supportingNode(final Node node) {
        for (final SupportingNode n : node.getSupportingNode()) {
            final SupportingNode1 n1 = n.getAugmentation(SupportingNode1.class);
            if (n1 != null && n1.getPathComputationClient().isControlling()) {
                return n.getKey().getNodeRef();
            }
        }

        return null;
    }

    private Ero buildEro(final List<ExplicitHops> explicitHops) {
        final EroBuilder b = new EroBuilder();

        if (!explicitHops.isEmpty()) {
            final List<Subobject> subobjs = new ArrayList<>(explicitHops.size());
            for (final ExplicitHops h : explicitHops) {

                final ExplicitHops1 h1 = h.getAugmentation(ExplicitHops1.class);
                if (h1 != null) {
                    final SubobjectBuilder sb = new SubobjectBuilder();
                    sb.fieldsFrom(h1);
                    sb.setLoose(h.isLoose());
                    subobjs.add(sb.build());
                } else {
                    LOG.debug("Ignoring unhandled explicit hop {}", h);
                }
            }
            b.setSubobject(subobjs);
        }
        return b.build();
    }

    @Override
    public ListenableFuture<RpcResult<PcepCreateP2pTunnelOutput>> pcepCreateP2pTunnel(final PcepCreateP2pTunnelInput input) {
        final PcepCreateP2pTunnelOutputBuilder b = new PcepCreateP2pTunnelOutputBuilder();
        b.setResult(AbstractInstructionExecutor.schedule(this.scheduler, new AbstractInstructionExecutor(input) {
            @Override
            protected ListenableFuture<OperationResult> invokeOperation() {
                final InstanceIdentifier<Topology> tii = TopologyProgrammingUtil.topologyForInput(input);

                final ReadTransaction t = TunnelProgramming.this.dataProvider.newReadOnlyTransaction();

                final TpReader dr = new TpReader(t, tii, input.getDestination());
                final TpReader sr = new TpReader(t, tii, input.getSource());

                final Node sn = Preconditions.checkNotNull(sr.getNode());
                final TerminationPoint sp = Preconditions.checkNotNull(sr.getTp());
                final TerminationPoint dp = Preconditions.checkNotNull(dr.getTp());

                final AddLspInputBuilder ab = new AddLspInputBuilder();
                ab.setNode(Preconditions.checkNotNull(supportingNode(sn)));
                ab.setName(input.getSymbolicPathName());

                // The link has to be non-existent
                final InstanceIdentifier<Link> lii = NodeChangedListener.linkIdentifier(tii, ab.getNode(), ab.getName());
                Preconditions.checkState(t.read(LogicalDatastoreType.OPERATIONAL, lii) == null);

                final ArgumentsBuilder args = new ArgumentsBuilder();
                args.setBandwidth(new BandwidthBuilder().setBandwidth(input.getBandwidth()).build());
                args.setClassType(new ClassTypeBuilder().setClassType(input.getClassType()).build());
                args.setEndpointsObj(new EndpointsObjBuilder().setAddressFamily(buildAddressFamily(sp, dp)).build());
                args.setEro(buildEro(input.getExplicitHops()));
                args.setLspa(new LspaBuilder(input).build());

                AdministrativeStatus adminStatus = input.getAugmentation(PcepCreateP2pTunnelInput1.class).getAdministrativeStatus();
                if (adminStatus != null) {
                    args.addAugmentation(Arguments2.class, new Arguments2Builder().setLsp(new LspBuilder().setAdministrative((adminStatus == AdministrativeStatus.Active) ? true : false).build()).build());
                }

                ab.setArguments(args.build());

                return Futures.transform(
                        (ListenableFuture<RpcResult<AddLspOutput>>) TunnelProgramming.this.topologyService.addLsp(ab.build()),
                        new Function<RpcResult<AddLspOutput>, OperationResult>() {
                            @Override
                            public OperationResult apply(final RpcResult<AddLspOutput> input) {
                                return input.getResult();
                            }
                        });
            }
        }));

        final RpcResult<PcepCreateP2pTunnelOutput> res = SuccessfulRpcResult.create(b.build());
        return Futures.immediateFuture(res);
    }

    private Node sourceNode(final ReadTransaction t, final InstanceIdentifier<Topology> topology, final Link link) throws InterruptedException, ExecutionException {
        Optional<Node> o = t.read(LogicalDatastoreType.OPERATIONAL,
                topology.child(Node.class, new NodeKey(link.getSource().getSourceNode()))).get();
        return (Node)o.get();
    }

    @Override
    public ListenableFuture<RpcResult<PcepDestroyTunnelOutput>> pcepDestroyTunnel(final PcepDestroyTunnelInput input) {
        final PcepDestroyTunnelOutputBuilder b = new PcepDestroyTunnelOutputBuilder();
        b.setResult(AbstractInstructionExecutor.schedule(this.scheduler, new AbstractInstructionExecutor(input) {
            @Override
            protected ListenableFuture<OperationResult> invokeOperation() {
                final InstanceIdentifier<Topology> tii = TopologyProgrammingUtil.topologyForInput(input);
                final InstanceIdentifier<Link> lii = TunnelProgrammingUtil.linkIdentifier(tii, input);

                final ReadTransaction t = TunnelProgramming.this.dataProvider.newReadOnlyTransaction();
                final Node node;
                final Link link;

                try {
                    // The link has to exist
                    link = (Link) t.read(LogicalDatastoreType.OPERATIONAL, lii).get().get();

                    // The source node has to exist
                    node = sourceNode(t, tii, link);
                } catch (InterruptedException | ExecutionException e) {
                    return Futures.<OperationResult>immediateFuture(new OperationResult() {
                        @Override
                        public Class<? extends DataContainer> getImplementedInterface() {
                            return OperationResult.class;
                        }

                        @Override
                        public FailureType getFailure() {
                            return FailureType.Unsent;
                        }

                        @Override
                        public List<Error> getError() {
                            return Collections.emptyList();
                        }
                    });
                }

                final RemoveLspInputBuilder ab = new RemoveLspInputBuilder();
                ab.setName(link.getAugmentation(Link1.class).getSymbolicPathName());
                ab.setNode(node.getSupportingNode().get(0).getKey().getNodeRef());

                return Futures.transform(
                        (ListenableFuture<RpcResult<RemoveLspOutput>>) TunnelProgramming.this.topologyService.removeLsp(ab.build()),
                        new Function<RpcResult<RemoveLspOutput>, OperationResult>() {
                            @Override
                            public OperationResult apply(final RpcResult<RemoveLspOutput> input) {
                                return input.getResult();
                            }
                        });
            }
        }));

        final RpcResult<PcepDestroyTunnelOutput> res = SuccessfulRpcResult.create(b.build());
        return Futures.immediateFuture(res);
    }

    @Override
    public ListenableFuture<RpcResult<PcepUpdateTunnelOutput>> pcepUpdateTunnel(final PcepUpdateTunnelInput input) {
        final PcepUpdateTunnelOutputBuilder b = new PcepUpdateTunnelOutputBuilder();
        b.setResult(AbstractInstructionExecutor.schedule(this.scheduler, new AbstractInstructionExecutor(input) {
            @Override
            protected ListenableFuture<OperationResult> invokeOperation() {

                final InstanceIdentifier<Topology> tii = TopologyProgrammingUtil.topologyForInput(input);
                final InstanceIdentifier<Link> lii = TunnelProgrammingUtil.linkIdentifier(tii, input);

                final ReadTransaction t = TunnelProgramming.this.dataProvider.newReadOnlyTransaction();
                final Link link;
                final Node node;

                try {
                    // The link has to exist
                    link = (Link) t.read(LogicalDatastoreType.OPERATIONAL, lii).get().get();

                    // The source node has to exist
                    node = sourceNode(t, tii, link);
                } catch (InterruptedException | ExecutionException e) {
                    return Futures.<OperationResult>immediateFuture(new OperationResult() {
                        @Override
                        public Class<? extends DataContainer> getImplementedInterface() {
                            return OperationResult.class;
                        }

                        @Override
                        public FailureType getFailure() {
                            return FailureType.Unsent;
                        }

                        @Override
                        public List<Error> getError() {
                            return Collections.emptyList();
                        }
                    });
                }

                final UpdateLspInputBuilder ab = new UpdateLspInputBuilder();
                ab.setName(link.getAugmentation(Link1.class).getSymbolicPathName());
                ab.setNode(Preconditions.checkNotNull(supportingNode(node)));

                final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.pcep.rev131024.update.lsp.args.ArgumentsBuilder args = new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.pcep.rev131024.update.lsp.args.ArgumentsBuilder();
                args.setBandwidth(new BandwidthBuilder().setBandwidth(input.getBandwidth()).build());
                args.setClassType(new ClassTypeBuilder().setClassType(input.getClassType()).build());
                args.setEro(buildEro(input.getExplicitHops()));
                args.setLspa(new LspaBuilder(input).build());

                AdministrativeStatus adminStatus = input.getAugmentation(PcepUpdateTunnelInput1.class).getAdministrativeStatus();
                if (adminStatus != null) {
                    args.addAugmentation(Arguments3.class, new Arguments3Builder().setLsp(new LspBuilder().setAdministrative((adminStatus == AdministrativeStatus.Active) ? true : false).build()).build());
                }

                ab.setArguments(args.build());

                return Futures.transform(
                        (ListenableFuture<RpcResult<UpdateLspOutput>>) TunnelProgramming.this.topologyService.updateLsp(ab.build()),
                        new Function<RpcResult<UpdateLspOutput>, OperationResult>() {
                            @Override
                            public OperationResult apply(final RpcResult<UpdateLspOutput> input) {
                                return input.getResult();
                            }
                        });
            }
        }));

        final RpcResult<PcepUpdateTunnelOutput> res = SuccessfulRpcResult.create(b.build());
        return Futures.immediateFuture(res);
    }

    @Override
    public void close() {
        LOG.debug("Shutting down instruction scheduler {}", this);
    }
}