Examples with PathConstraints org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.path.computation.rev200120.PathConstraints used on opensource projects

Example 6 with PathConstraints

use of org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.path.computation.rev200120.PathConstraints in project bgpcep by opendaylight.

the class PathComputationImpl method computePath.

@Override
public Message computePath(final Requests req) {
    LOG.info("Received Compute Path request");
    /* Check that Request Parameter Object is present */
    if (req == null || req.getRp() == null) {
        LOG.error("Missing Request Parameter Objects. Abort!");
        return MessagesUtil.createErrorMsg(PCEPErrors.RP_MISSING, Uint32.ZERO);
    }
    LOG.debug("Request for path computation {}", req);
    /*
         * Check that mandatory End Point Objects are present and Source /
         * Destination are know in the TED Graph
         */
    P2p input = req.getSegmentComputation().getP2p();
    if (input == null || input.getEndpointsObj() == null) {
        LOG.error("Missing End Point Objects. Abort!");
        Uint32 reqID = req.getRp().getRequestId().getValue();
        return MessagesUtil.createErrorMsg(PCEPErrors.END_POINTS_MISSING, reqID);
    }
    VertexKey source = getSourceVertexKey(input.getEndpointsObj());
    VertexKey destination = getDestinationVertexKey(input.getEndpointsObj());
    if (source == null) {
        return MessagesUtil.createNoPathMessage(req.getRp(), MessagesUtil.UNKNOWN_SOURCE);
    }
    if (destination == null) {
        return MessagesUtil.createNoPathMessage(req.getRp(), MessagesUtil.UNKNOWN_DESTINATION);
    }
    /* Create new Constraints Object from the request */
    PathConstraints cts = getConstraints(input, !PSTUtil.isDefaultPST(req.getRp().getTlvs().getPathSetupType()));
    /* Determine Path Computation Algorithm according to Input choice */
    AlgorithmType algoType;
    if (cts.getTeMetric() == null && cts.getDelay() == null) {
        algoType = AlgorithmType.Spf;
    } else if (cts.getDelay() == null) {
        algoType = AlgorithmType.Cspf;
    } else {
        algoType = AlgorithmType.Samcra;
    }
    PathComputationAlgorithm algo = algoProvider.getPathComputationAlgorithm(tedGraph, algoType);
    if (algo == null) {
        return MessagesUtil.createErrorMsg(PCEPErrors.RESOURCE_LIMIT_EXCEEDED, Uint32.ZERO);
    }
    /* Request Path Computation for given source, destination and constraints */
    LOG.debug("Call Path Computation {} algorithm for path from {} to {} with contraints {}", algoType, source, destination, cts);
    final ConstrainedPath cpath = algo.computeP2pPath(source, destination, cts);
    LOG.info("Computed path: {}", cpath.getPathDescription());
    /* Check if we got a valid Path and return appropriate message */
    if (cpath.getStatus() == ComputationStatus.Completed) {
        return MessagesUtil.createPcRepMessage(req.getRp(), req.getSegmentComputation().getP2p(), cpath);
    } else {
        return MessagesUtil.createNoPathMessage(req.getRp(), MessagesUtil.NO_PATH);
    }
}