| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with this |
| * work for additional information regarding copyright ownership. The ASF |
| * licenses this file to You under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.hugegraph.api.traversers; |
| |
| import static org.apache.hugegraph.traversal.algorithm.HugeTraverser.DEFAULT_CAPACITY; |
| import static org.apache.hugegraph.traversal.algorithm.HugeTraverser.DEFAULT_PATHS_LIMIT; |
| |
| import java.util.ArrayList; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.apache.hugegraph.HugeGraph; |
| import org.apache.hugegraph.backend.id.Id; |
| import org.apache.hugegraph.core.GraphManager; |
| import org.apache.hugegraph.traversal.algorithm.HugeTraverser; |
| import org.apache.hugegraph.traversal.algorithm.TemplatePathsTraverser; |
| import org.apache.hugegraph.traversal.algorithm.steps.RepeatEdgeStep; |
| import org.apache.hugegraph.util.E; |
| import org.apache.hugegraph.util.Log; |
| import org.apache.tinkerpop.gremlin.structure.Edge; |
| import org.apache.tinkerpop.gremlin.structure.Vertex; |
| import org.slf4j.Logger; |
| |
| import com.codahale.metrics.annotation.Timed; |
| import com.fasterxml.jackson.annotation.JsonProperty; |
| |
| import io.swagger.v3.oas.annotations.tags.Tag; |
| import jakarta.inject.Singleton; |
| import jakarta.ws.rs.Consumes; |
| import jakarta.ws.rs.POST; |
| import jakarta.ws.rs.Path; |
| import jakarta.ws.rs.PathParam; |
| import jakarta.ws.rs.Produces; |
| import jakarta.ws.rs.core.Context; |
| |
| @Path("graphs/{graph}/traversers/templatepaths") |
| @Singleton |
| @Tag(name = "TemplatePathsAPI") |
| public class TemplatePathsAPI extends TraverserAPI { |
| |
| private static final Logger LOG = Log.logger(TemplatePathsAPI.class); |
| |
| private static List<RepeatEdgeStep> steps(HugeGraph g, |
| List<TemplatePathStep> steps) { |
| List<RepeatEdgeStep> edgeSteps = new ArrayList<>(steps.size()); |
| for (TemplatePathStep step : steps) { |
| edgeSteps.add(repeatEdgeStep(g, step)); |
| } |
| return edgeSteps; |
| } |
| |
| private static RepeatEdgeStep repeatEdgeStep(HugeGraph graph, |
| TemplatePathStep step) { |
| return new RepeatEdgeStep(graph, step.direction, step.labels, |
| step.properties, step.maxDegree, |
| step.skipDegree, step.maxTimes); |
| } |
| |
| @POST |
| @Timed |
| @Consumes(APPLICATION_JSON) |
| @Produces(APPLICATION_JSON_WITH_CHARSET) |
| public String post(@Context GraphManager manager, |
| @PathParam("graph") String graph, |
| Request request) { |
| E.checkArgumentNotNull(request, "The request body can't be null"); |
| E.checkArgumentNotNull(request.sources, |
| "The sources of request can't be null"); |
| E.checkArgumentNotNull(request.targets, |
| "The targets of request can't be null"); |
| E.checkArgument(request.steps != null && !request.steps.isEmpty(), |
| "The steps of request can't be empty"); |
| |
| LOG.debug("Graph [{}] get template paths from source vertices '{}', " + |
| "target vertices '{}', with steps '{}', " + |
| "capacity '{}', limit '{}', with_vertex '{}' and with_edge '{}'", |
| graph, request.sources, request.targets, request.steps, |
| request.capacity, request.limit, request.withVertex, request.withEdge); |
| |
| ApiMeasurer measure = new ApiMeasurer(); |
| |
| HugeGraph g = graph(manager, graph); |
| Iterator<Vertex> sources = request.sources.vertices(g); |
| Iterator<Vertex> targets = request.targets.vertices(g); |
| List<RepeatEdgeStep> steps = steps(g, request.steps); |
| |
| TemplatePathsTraverser traverser = new TemplatePathsTraverser(g); |
| TemplatePathsTraverser.WrappedPathSet wrappedPathSet = |
| traverser.templatePaths(sources, targets, steps, |
| request.withRing, request.capacity, |
| request.limit); |
| measure.addIterCount(traverser.vertexIterCounter.get(), |
| traverser.edgeIterCounter.get()); |
| |
| Set<HugeTraverser.Path> paths = wrappedPathSet.paths(); |
| |
| Iterator<?> iterVertex; |
| Set<Id> vertexIds = new HashSet<>(); |
| for (HugeTraverser.Path path : paths) { |
| vertexIds.addAll(path.vertices()); |
| } |
| if (request.withVertex && !vertexIds.isEmpty()) { |
| iterVertex = g.vertices(vertexIds.toArray()); |
| measure.addIterCount(vertexIds.size(), 0L); |
| } else { |
| iterVertex = vertexIds.iterator(); |
| } |
| |
| Iterator<?> iterEdge; |
| Set<Edge> edges = wrappedPathSet.edges(); |
| if (request.withEdge && !edges.isEmpty()) { |
| iterEdge = edges.iterator(); |
| } else { |
| iterEdge = HugeTraverser.EdgeRecord.getEdgeIds(edges).iterator(); |
| } |
| |
| return manager.serializer(g, measure.measures()) |
| .writePaths("paths", paths, false, |
| iterVertex, iterEdge); |
| } |
| |
| private static class Request { |
| |
| @JsonProperty("sources") |
| public Vertices sources; |
| @JsonProperty("targets") |
| public Vertices targets; |
| @JsonProperty("steps") |
| public List<TemplatePathStep> steps; |
| @JsonProperty("with_ring") |
| public boolean withRing = false; |
| @JsonProperty("capacity") |
| public long capacity = Long.parseLong(DEFAULT_CAPACITY); |
| @JsonProperty("limit") |
| public int limit = Integer.parseInt(DEFAULT_PATHS_LIMIT); |
| @JsonProperty("with_vertex") |
| public boolean withVertex = false; |
| @JsonProperty("with_edge") |
| public boolean withEdge = false; |
| |
| @Override |
| public String toString() { |
| return String.format("TemplatePathsRequest{sources=%s,targets=%s," + |
| "steps=%s,withRing=%s,capacity=%s,limit=%s," + |
| "withVertex=%s,withEdge=%s}", |
| this.sources, this.targets, this.steps, |
| this.withRing, this.capacity, this.limit, |
| this.withVertex, this.withEdge); |
| } |
| } |
| |
| protected static class TemplatePathStep extends Step { |
| |
| @JsonProperty("max_times") |
| public int maxTimes = 1; |
| |
| @Override |
| public String toString() { |
| return String.format("TemplatePathStep{direction=%s,labels=%s," + |
| "properties=%s,maxDegree=%s,skipDegree=%s," + |
| "maxTimes=%s}", |
| this.direction, this.labels, this.properties, |
| this.maxDegree, this.skipDegree, |
| this.maxTimes); |
| } |
| } |
| } |