| /* |
| * Copyright 2017 HugeGraph Authors |
| * |
| * 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 com.baidu.hugegraph.api.traversers; |
| |
| import static com.baidu.hugegraph.traversal.algorithm.HugeTraverser.DEFAULT_CAPACITY; |
| import static com.baidu.hugegraph.traversal.algorithm.HugeTraverser.DEFAULT_MAX_DEGREE; |
| import static com.baidu.hugegraph.traversal.algorithm.HugeTraverser.DEFAULT_MAX_DEPTH; |
| import static com.baidu.hugegraph.traversal.algorithm.HugeTraverser.DEFAULT_PATHS_LIMIT; |
| |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.Set; |
| |
| import javax.inject.Singleton; |
| import javax.ws.rs.Consumes; |
| import javax.ws.rs.DefaultValue; |
| import javax.ws.rs.GET; |
| import javax.ws.rs.POST; |
| import javax.ws.rs.Path; |
| import javax.ws.rs.PathParam; |
| import javax.ws.rs.Produces; |
| import javax.ws.rs.QueryParam; |
| import javax.ws.rs.core.Context; |
| |
| import org.apache.tinkerpop.gremlin.structure.Vertex; |
| import org.slf4j.Logger; |
| |
| import com.baidu.hugegraph.HugeGraph; |
| import com.baidu.hugegraph.api.graph.EdgeAPI; |
| import com.baidu.hugegraph.api.graph.VertexAPI; |
| import com.baidu.hugegraph.backend.id.Id; |
| import com.baidu.hugegraph.backend.query.QueryResults; |
| import com.baidu.hugegraph.core.GraphManager; |
| import com.baidu.hugegraph.server.RestServer; |
| import com.baidu.hugegraph.traversal.algorithm.CollectionPathsTraverser; |
| import com.baidu.hugegraph.traversal.algorithm.HugeTraverser; |
| import com.baidu.hugegraph.traversal.algorithm.PathsTraverser; |
| import com.baidu.hugegraph.traversal.algorithm.steps.EdgeStep; |
| import com.baidu.hugegraph.type.define.Directions; |
| import com.baidu.hugegraph.util.E; |
| import com.baidu.hugegraph.util.Log; |
| import com.codahale.metrics.annotation.Timed; |
| import com.fasterxml.jackson.annotation.JsonProperty; |
| |
| @Path("graphs/{graph}/traversers/paths") |
| @Singleton |
| public class PathsAPI extends TraverserAPI { |
| |
| private static final Logger LOG = Log.logger(RestServer.class); |
| |
| @GET |
| @Timed |
| @Produces(APPLICATION_JSON_WITH_CHARSET) |
| public String get(@Context GraphManager manager, |
| @PathParam("graph") String graph, |
| @QueryParam("source") String source, |
| @QueryParam("target") String target, |
| @QueryParam("direction") String direction, |
| @QueryParam("label") String edgeLabel, |
| @QueryParam("max_depth") int depth, |
| @QueryParam("max_degree") |
| @DefaultValue(DEFAULT_MAX_DEGREE) long maxDegree, |
| @QueryParam("capacity") |
| @DefaultValue(DEFAULT_CAPACITY) long capacity, |
| @QueryParam("limit") |
| @DefaultValue(DEFAULT_PATHS_LIMIT) long limit) { |
| LOG.debug("Graph [{}] get paths from '{}', to '{}' with " + |
| "direction {}, edge label {}, max depth '{}', " + |
| "max degree '{}', capacity '{}' and limit '{}'", |
| graph, source, target, direction, edgeLabel, depth, |
| maxDegree, capacity, limit); |
| |
| Id sourceId = VertexAPI.checkAndParseVertexId(source); |
| Id targetId = VertexAPI.checkAndParseVertexId(target); |
| Directions dir = Directions.convert(EdgeAPI.parseDirection(direction)); |
| |
| HugeGraph g = graph(manager, graph); |
| PathsTraverser traverser = new PathsTraverser(g); |
| HugeTraverser.PathSet paths = traverser.paths(sourceId, dir, targetId, |
| dir.opposite(), edgeLabel, |
| depth, maxDegree, capacity, |
| limit); |
| return manager.serializer(g).writePaths("paths", paths, false); |
| } |
| |
| @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.checkArgumentNotNull(request.step, |
| "The step of request can't be null"); |
| E.checkArgument(request.depth > 0 && request.depth <= DEFAULT_MAX_DEPTH, |
| "The depth of request must be in (0, %s], " + |
| "but got: %s", DEFAULT_MAX_DEPTH, request.depth); |
| |
| LOG.debug("Graph [{}] get paths from source vertices '{}', target " + |
| "vertices '{}', with step '{}', max depth '{}', " + |
| "capacity '{}', limit '{}' and with_vertex '{}'", |
| graph, request.sources, request.targets, request.step, |
| request.depth, request.capacity, request.limit, |
| request.withVertex); |
| |
| HugeGraph g = graph(manager, graph); |
| Iterator<Vertex> sources = request.sources.vertices(g); |
| Iterator<Vertex> targets = request.targets.vertices(g); |
| EdgeStep step = step(g, request.step); |
| |
| CollectionPathsTraverser traverser = new CollectionPathsTraverser(g); |
| Collection<HugeTraverser.Path> paths; |
| paths = traverser.paths(sources, targets, step, request.depth, |
| request.nearest, request.capacity, |
| request.limit); |
| |
| if (!request.withVertex) { |
| return manager.serializer(g).writePaths("paths", paths, false); |
| } |
| |
| Set<Id> ids = new HashSet<>(); |
| for (HugeTraverser.Path p : paths) { |
| ids.addAll(p.vertices()); |
| } |
| Iterator<Vertex> iter = QueryResults.emptyIterator(); |
| if (!ids.isEmpty()) { |
| iter = g.vertices(ids.toArray()); |
| } |
| return manager.serializer(g).writePaths("paths", paths, false, iter); |
| } |
| |
| private static class Request { |
| |
| @JsonProperty("sources") |
| public Vertices sources; |
| @JsonProperty("targets") |
| public Vertices targets; |
| @JsonProperty("step") |
| public TraverserAPI.Step step; |
| @JsonProperty("max_depth") |
| public int depth; |
| @JsonProperty("nearest") |
| public boolean nearest = false; |
| @JsonProperty("capacity") |
| public long capacity = Long.parseLong(DEFAULT_CAPACITY); |
| @JsonProperty("limit") |
| public long limit = Long.parseLong(DEFAULT_PATHS_LIMIT); |
| @JsonProperty("with_vertex") |
| public boolean withVertex = false; |
| |
| @Override |
| public String toString() { |
| return String.format("PathRequest{sources=%s,targets=%s,step=%s," + |
| "maxDepth=%s,nearest=%s,capacity=%s," + |
| "limit=%s,withVertex=%s}", this.sources, |
| this.targets, this.step, this.depth, |
| this.nearest, this.capacity, |
| this.limit, this.withVertex); |
| } |
| } |
| } |