Yuta HIGUCHI | a1e655a | 2014-01-23 17:43:11 -0800 | [diff] [blame^] | 1 | /* Copyright (c) 2013 Stanford University |
| 2 | * |
| 3 | * Permission to use, copy, modify, and distribute this software for any |
| 4 | * purpose with or without fee is hereby granted, provided that the above |
| 5 | * copyright notice and this permission notice appear in all copies. |
| 6 | * |
| 7 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR(S) DISCLAIM ALL WARRANTIES |
| 8 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 9 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL AUTHORS BE LIABLE FOR |
| 10 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 11 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 12 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 13 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 14 | */ |
| 15 | |
yoshi | 28bac13 | 2014-01-22 11:00:17 -0800 | [diff] [blame] | 16 | package com.tinkerpop.blueprints.impls.ramcloud; |
| 17 | |
| 18 | import java.nio.BufferUnderflowException; |
| 19 | import java.nio.ByteBuffer; |
| 20 | import java.nio.ByteOrder; |
| 21 | import java.util.Arrays; |
| 22 | |
| 23 | import org.slf4j.Logger; |
| 24 | import org.slf4j.LoggerFactory; |
| 25 | |
| 26 | import com.sun.jersey.core.util.Base64; |
| 27 | import com.tinkerpop.blueprints.Direction; |
| 28 | import com.tinkerpop.blueprints.Edge; |
| 29 | import com.tinkerpop.blueprints.Vertex; |
| 30 | import com.tinkerpop.blueprints.util.ExceptionFactory; |
| 31 | import com.tinkerpop.blueprints.impls.ramcloud.PerfMon; |
| 32 | import edu.stanford.ramcloud.JRamCloud; |
| 33 | |
| 34 | public class RamCloudEdge extends RamCloudElement implements Edge { |
| 35 | |
| 36 | private final static Logger log = LoggerFactory.getLogger(RamCloudGraph.class); |
| 37 | private RamCloudVertex outVertex; |
| 38 | private RamCloudVertex inVertex; |
| 39 | private String label; |
| 40 | private byte[] rcKey; |
| 41 | private RamCloudGraph graph; |
| 42 | |
| 43 | public RamCloudEdge(RamCloudVertex outVertex, RamCloudVertex inVertex, String label, RamCloudGraph graph) { |
| 44 | super(edgeToRcKey(outVertex, inVertex, label), graph.edgePropTableId, graph); |
| 45 | |
| 46 | this.outVertex = outVertex; |
| 47 | this.inVertex = inVertex; |
| 48 | this.label = label; |
| 49 | this.rcKey = edgeToRcKey(outVertex, inVertex, label); |
| 50 | this.graph = graph; |
| 51 | } |
| 52 | |
| 53 | public RamCloudEdge(byte[] rcKey, RamCloudGraph graph) { |
| 54 | super(rcKey, graph.edgePropTableId, graph); |
| 55 | |
| 56 | ByteBuffer edgeId = ByteBuffer.wrap(rcKey).order(ByteOrder.LITTLE_ENDIAN); |
| 57 | outVertex = new RamCloudVertex(edgeId.getLong(), graph); |
| 58 | inVertex = new RamCloudVertex(edgeId.getLong(), graph); |
| 59 | label = new String(rcKey, 16, rcKey.length - 16); |
| 60 | |
| 61 | this.rcKey = rcKey; |
| 62 | this.graph = graph; |
| 63 | } |
| 64 | |
| 65 | private static byte[] edgeToRcKey(RamCloudVertex outVertex, RamCloudVertex inVertex, String label) { |
| 66 | return ByteBuffer.allocate(16 + label.length()).order(ByteOrder.LITTLE_ENDIAN).putLong((Long) outVertex.getId()).putLong((Long) inVertex.getId()).put(label.getBytes()).array(); |
| 67 | } |
| 68 | |
| 69 | @Override |
| 70 | public Vertex getVertex(Direction direction) throws IllegalArgumentException { |
| 71 | if (direction.equals(Direction.OUT)) { |
| 72 | return outVertex; |
| 73 | } else if (direction.equals(Direction.IN)) { |
| 74 | return inVertex; |
| 75 | } else { |
| 76 | throw ExceptionFactory.bothIsNotSupported(); |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | @Override |
| 81 | public String getLabel() { |
| 82 | return label; |
| 83 | } |
| 84 | |
| 85 | public boolean isLoop() { |
| 86 | return outVertex.equals(inVertex); |
| 87 | } |
| 88 | |
| 89 | public Vertex getNeighbor(Vertex vertex) { |
| 90 | if (outVertex.equals(vertex)) { |
| 91 | return inVertex; |
| 92 | } else if (inVertex.equals(vertex)) { |
| 93 | return outVertex; |
| 94 | } else { |
| 95 | return null; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | @Override |
| 100 | public void remove() { |
| 101 | if (isLoop()) { |
| 102 | outVertex.removeEdgeFromAdjList(this); |
| 103 | } else { |
| 104 | outVertex.removeEdgeFromAdjList(this); |
| 105 | inVertex.removeEdgeFromAdjList(this); |
| 106 | } |
| 107 | |
| 108 | super.remove(); |
| 109 | } |
| 110 | |
| 111 | void removeProperties() { |
| 112 | super.remove(); |
| 113 | } |
| 114 | |
| 115 | @Override |
| 116 | public Object getId() { |
| 117 | return new String(Base64.encode(rcKey)); |
| 118 | } |
| 119 | |
| 120 | public boolean exists() { |
| 121 | boolean edgePropTableEntryExists; |
| 122 | boolean outVertexEntryExists; |
| 123 | boolean inVertexEntryExists; |
| 124 | |
| 125 | PerfMon pm = PerfMon.getInstance(); |
| 126 | try { |
| 127 | JRamCloud edgeTable = graph.getRcClient(); |
| 128 | pm.read_start("RamCloudEdge exists()"); |
| 129 | edgeTable.read(graph.edgePropTableId, rcKey); |
| 130 | pm.read_end("RamCloudEdge exists()"); |
| 131 | edgePropTableEntryExists = true; |
| 132 | } catch (Exception e) { |
| 133 | pm.read_end("RamCloudEdge exists()"); |
| 134 | // Edge property table entry does not exist |
| 135 | edgePropTableEntryExists = false; |
| 136 | } |
| 137 | |
| 138 | outVertexEntryExists = outVertex.getEdgeSet().contains(this); |
| 139 | |
| 140 | if (!outVertex.equals(inVertex)) { |
| 141 | inVertexEntryExists = inVertex.getEdgeSet().contains(this); |
| 142 | } else { |
| 143 | inVertexEntryExists = outVertexEntryExists; |
| 144 | } |
| 145 | |
| 146 | if (edgePropTableEntryExists && outVertexEntryExists && inVertexEntryExists) { |
| 147 | return true; |
| 148 | } else if (!edgePropTableEntryExists && !outVertexEntryExists && !inVertexEntryExists) { |
| 149 | return false; |
| 150 | } else { |
| 151 | log.warn("{}: Detected RamCloudGraph inconsistency: edgePropTableEntryExists={}, outVertexEntryExists={}, inVertexEntryExists={}.", this, edgePropTableEntryExists, outVertexEntryExists, inVertexEntryExists); |
| 152 | return true; |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | public void create() throws Exception { |
| 157 | // TODO: Existence check costs extra (presently 3 reads), could use option to turn on/off |
| 158 | if (!exists()) { |
| 159 | PerfMon pm = PerfMon.getInstance(); |
| 160 | // create edge property table |
| 161 | JRamCloud edgeTable = graph.getRcClient(); |
| 162 | pm.write_start("RamCloudEdge create()"); |
| 163 | edgeTable.write(graph.edgePropTableId, rcKey, ByteBuffer.allocate(0).array()); |
| 164 | pm.write_end("RamCloudEdge create()"); |
| 165 | |
| 166 | boolean addSucc = outVertex.addEdgeToAdjList(this); |
| 167 | if ( !addSucc ) { |
| 168 | edgeTable.remove(graph.edgePropTableId, rcKey); |
| 169 | throw ExceptionFactory.edgeWithIdAlreadyExist(rcKey); |
| 170 | } |
| 171 | if (!isLoop()) { |
| 172 | addSucc = inVertex.addEdgeToAdjList(this); |
| 173 | if ( !addSucc ) { |
| 174 | edgeTable.remove(graph.edgePropTableId, rcKey); |
| 175 | outVertex.removeEdgeFromAdjList(this); |
| 176 | throw ExceptionFactory.edgeWithIdAlreadyExist(rcKey); |
| 177 | } |
| 178 | } |
| 179 | } else { |
| 180 | throw ExceptionFactory.edgeWithIdAlreadyExist(rcKey); |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | public static boolean isValidEdgeId(byte[] id) { |
| 185 | if (id == null) { |
| 186 | return false; |
| 187 | } |
| 188 | if (id.length == 0) { |
| 189 | return false; |
| 190 | } |
| 191 | |
| 192 | ByteBuffer edgeId = ByteBuffer.wrap(id); |
| 193 | try { |
| 194 | edgeId.getLong(); |
| 195 | } catch (BufferUnderflowException e) { |
| 196 | return false; |
| 197 | } |
| 198 | |
| 199 | try { |
| 200 | edgeId.getLong(); |
| 201 | } catch (BufferUnderflowException e) { |
| 202 | return false; |
| 203 | } |
| 204 | |
| 205 | if (edgeId.remaining() == 0) { |
| 206 | return false; |
| 207 | } |
| 208 | |
| 209 | return true; |
| 210 | } |
| 211 | |
| 212 | @Override |
| 213 | public int hashCode() { |
| 214 | return Arrays.hashCode(rcKey); |
| 215 | } |
| 216 | |
| 217 | @Override |
| 218 | public boolean equals(Object obj) { |
| 219 | if (this == obj) { |
| 220 | return true; |
| 221 | } |
| 222 | if (obj == null) { |
| 223 | return false; |
| 224 | } |
| 225 | if (getClass() != obj.getClass()) { |
| 226 | return false; |
| 227 | } |
| 228 | RamCloudEdge other = (RamCloudEdge) obj; |
| 229 | return Arrays.equals(rcKey, other.rcKey); |
| 230 | } |
| 231 | |
| 232 | @Override |
| 233 | public String toString() { |
| 234 | return "RamCloudEdge [outVertex=" + outVertex + ", inVertex=" + inVertex |
| 235 | + ", label=" + label + "]"; |
| 236 | } |
| 237 | } |