Examples with JanusGraphEdgeVertexStep org.janusgraph.graphdb.tinkerpop.optimize.step.JanusGraphEdgeVertexStep used on opensource projects

Example 1 with JanusGraphEdgeVertexStep

use of org.janusgraph.graphdb.tinkerpop.optimize.step.JanusGraphEdgeVertexStep in project janusgraph by JanusGraph.

the class JanusGraphLocalQueryOptimizerStrategy method applyBatchPropertyPrefetching.

/**
 * If this step is followed by a subsequent has step then the properties will need to be
 * known when that has step is executed. The batch property pre-fetching optimisation
 * loads those properties into the vertex cache with a multiQuery preventing the need to
 * go back to the storage back-end for each vertex to fetch the properties.
 *
 * @param traversal         The traversal containing the step
 * @param vertexStep        The step to potentially apply the optimisation to
 * @param nextStep          The next step in the traversal
 * @param txVertexCacheSize The size of the vertex cache
 */
private void applyBatchPropertyPrefetching(final Admin<?, ?> traversal, final JanusGraphVertexStep vertexStep, final Step nextStep, final int txVertexCacheSize) {
    if (Vertex.class.isAssignableFrom(vertexStep.getReturnClass())) {
        if (HasStepFolder.foldableHasContainerNoLimit(vertexStep)) {
            vertexStep.setBatchPropertyPrefetching(true);
            vertexStep.setTxVertexCacheSize(txVertexCacheSize);
        }
    } else if (nextStep instanceof EdgeVertexStep) {
        EdgeVertexStep edgeVertexStep = (EdgeVertexStep) nextStep;
        if (HasStepFolder.foldableHasContainerNoLimit(edgeVertexStep)) {
            JanusGraphEdgeVertexStep estep = new JanusGraphEdgeVertexStep(edgeVertexStep, txVertexCacheSize);
            TraversalHelper.replaceStep(nextStep, estep, traversal);
        }
    }
}