Examples with LazyQueryPlan com.datastax.oss.driver.internal.core.util.collection.LazyQueryPlan used on opensource projects

Example 1 with LazyQueryPlan

use of com.datastax.oss.driver.internal.core.util.collection.LazyQueryPlan in project java-driver by datastax.

the class BasicLoadBalancingPolicy method maybeAddDcFailover.

@NonNull
protected Queue<Node> maybeAddDcFailover(@Nullable Request request, @NonNull Queue<Node> local) {
    if (maxNodesPerRemoteDc <= 0 || localDc == null) {
        return local;
    }
    if (!allowDcFailoverForLocalCl && request instanceof Statement) {
        Statement<?> statement = (Statement<?>) request;
        ConsistencyLevel consistency = statement.getConsistencyLevel();
        if (consistency == null) {
            consistency = defaultConsistencyLevel;
        }
        if (consistency.isDcLocal()) {
            return local;
        }
    }
    QueryPlan remote = new LazyQueryPlan() {

        @Override
        protected Object[] computeNodes() {
            Object[] remoteNodes = liveNodes.dcs().stream().filter(Predicates.not(Predicates.equalTo(localDc))).flatMap(dc -> liveNodes.dc(dc).stream().limit(maxNodesPerRemoteDc)).toArray();
            int remoteNodesLength = remoteNodes.length;
            if (remoteNodesLength == 0) {
                return EMPTY_NODES;
            }
            shuffleHead(remoteNodes, remoteNodesLength);
            return remoteNodes;
        }
    };
    return new CompositeQueryPlan(local, remote);
}