client/src/main/java/com/att/cadi/dme2/DME2Locator.java

   1 /*******************************************************************************\r
   2  * ============LICENSE_START====================================================\r
   3  * * org.onap.aai\r
   4  * * ===========================================================================\r
   5  * * Copyright © 2017 AT&T Intellectual Property. All rights reserved.\r
   6  * * Copyright © 2017 Amdocs\r
   7  * * ===========================================================================\r
   8  * * Licensed under the Apache License, Version 2.0 (the "License");\r
   9  * * you may not use this file except in compliance with the License.\r
  10  * * You may obtain a copy of the License at\r
  11  * * \r
  12  *  *      http://www.apache.org/licenses/LICENSE-2.0\r
  13  * * \r
  14  *  * Unless required by applicable law or agreed to in writing, software\r
  15  * * distributed under the License is distributed on an "AS IS" BASIS,\r
  16  * * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
  17  * * See the License for the specific language governing permissions and\r
  18  * * limitations under the License.\r
  19  * * ============LICENSE_END====================================================\r
  20  * *\r
  21  * * ECOMP is a trademark and service mark of AT&T Intellectual Property.\r
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  23  ******************************************************************************/\r
  24 package com.att.cadi.dme2;\r
  25 \r
  26 \r
  27 import java.net.InetAddress;\r
  28 import java.net.URI;\r
  29 import java.net.URISyntaxException;\r
  30 import java.net.UnknownHostException;\r
  31 import java.util.Arrays;\r
  32 import java.util.Comparator;\r
  33 import java.util.Random;\r
  34 \r
  35 //\r
  36 import com.att.aft.dme2.api.DME2Exception;\r
  37 import com.att.aft.dme2.api.DME2Manager;\r
  38 import com.att.aft.dme2.api.DME2Server;\r
  39 import com.att.aft.dme2.manager.registry.DME2Endpoint;\r
  40 import com.att.cadi.Access;\r
  41 import com.att.cadi.Access.Level;\r
  42 import com.att.cadi.Locator;\r
  43 import com.att.cadi.LocatorException;\r
  44 \r
  45 public class DME2Locator implements Locator {\r
  46         private DME2Manager dm;\r
  47         private DME2Endpoint[] endpoints;\r
  48         private Access access;\r
  49         private String service;\r
  50         private String version;\r
  51         private String routeOffer;\r
  52         private String envContext;\r
  53         private String thisMachine;\r
  54         private String pathInfo;\r
  55         private int thisPort;\r
  56         private boolean removeSelf;\r
  57         private final static Random random = new Random();\r
  58 \r
  59         // Default is to not bother trying to remove self\r
  60         public DME2Locator(Access access, DME2Manager dm, String service, String version, String envContext, String routeOffer) throws DME2Exception, UnknownHostException, LocatorException {\r
  61                 this(access,dm,service,version,envContext,routeOffer,false);\r
  62         }\r
  63         \r
  64         public DME2Locator(Access access, DME2Manager dm, String service, String version, String envContext, String routeOffer, boolean removeSelf) throws DME2Exception, UnknownHostException, LocatorException {\r
  65                 this.access = access;\r
  66                 if(dm==null) {\r
  67                         this.dm = new DME2Manager("DME2Locator created DME2Manager",System.getProperties());\r
  68                 } else {\r
  69                         this.dm = dm;\r
  70                 }\r
  71                 this.service = service;\r
  72                 this.version = version;\r
  73                 this.envContext = envContext;\r
  74                 this.routeOffer = routeOffer;\r
  75                 refresh();\r
  76                 DME2Server server = dm.getServer(); \r
  77                 if(server == null) {\r
  78                         thisMachine = InetAddress.getLocalHost().getHostName();\r
  79                         thisPort = 0;\r
  80                 } else {\r
  81                         try {\r
  82                                 thisMachine = server.getServerProperties().getHostname();\r
  83                                 //thisPort = server.getPort();\r
  84                                 thisPort = server.getServerProperties().getPort();\r
  85                         } catch(NullPointerException np) { // BAD BOY, DME2...\r
  86                                 access.log(Level.ERROR, "WARNING: DME2 threw a NullPointer Exception getting Server Machine and Port");\r
  87                                 thisMachine = InetAddress.getLocalHost().getHostName();\r
  88                                 thisPort = 0;\r
  89                         }\r
  90                 }\r
  91                 this.removeSelf = removeSelf;\r
  92         }\r
  93 \r
  94         // Default is to not bother trying to remove self\r
  95         public DME2Locator(Access access, DME2Manager dm, String aafurl) throws DME2Exception, UnknownHostException, LocatorException {\r
  96                 this(access,dm,aafurl,false);\r
  97         }\r
  98         \r
  99         public DME2Locator(Access access, DME2Manager dm, String aafurl, boolean removeSelf) throws DME2Exception, UnknownHostException, LocatorException {\r
 100                 if(aafurl==null) throw new LocatorException("URL is null");\r
 101                 this.access = access;\r
 102                 if(dm==null) {\r
 103                         dm = this.dm = new DME2Manager("DME2Locator created DME2Manager",System.getProperties());\r
 104                 } else {\r
 105                         this.dm = dm;\r
 106                 }\r
 107                 String[] split = aafurl.split("/");\r
 108                 StringBuilder sb = new StringBuilder();\r
 109                 boolean dme2Entered = false;\r
 110                 for(String s : split) {\r
 111                         if(s.startsWith(     "service=")) this.service = s.substring(8);\r
 112                         else if(s.startsWith("version=")) this.version = s.substring(8);\r
 113                         else if(s.startsWith("envContext=")) this.envContext = s.substring(11);\r
 114                         else if(s.startsWith("routeOffer=")) {\r
 115                                 this.routeOffer = s.substring(11);\r
 116                                 dme2Entered = true;\r
 117                         }\r
 118                         else if(dme2Entered) {\r
 119                                 sb.append('/');\r
 120                                 sb.append(s);\r
 121                         }\r
 122                         pathInfo = sb.toString();\r
 123                 }\r
 124                 DME2Server server = dm.getServer(); \r
 125                 if(server == null) {\r
 126                         thisMachine = InetAddress.getLocalHost().getHostName();\r
 127                         thisPort = 0;\r
 128                 } else {\r
 129                         thisMachine = server.getServerProperties().getHostname();\r
 130                         if(thisMachine==null) { // even if server !=null, apparently, it can be uninitialized\r
 131                                 thisMachine = InetAddress.getLocalHost().getHostName();\r
 132                                 thisPort = 0;\r
 133                         } else {\r
 134                                 try {\r
 135                                         thisPort = server.getServerProperties().getPort();\r
 136                                 } catch (Exception e) {\r
 137                                         thisPort = 0;\r
 138                                 }\r
 139                         }                       \r
 140                 }\r
 141                 this.removeSelf=removeSelf;\r
 142                 refresh();\r
 143         }\r
 144         \r
 145         @Override\r
 146         public boolean refresh() {\r
 147                 try {\r
 148                         dm.refresh();\r
 149                         endpoints = dm.findEndpoints(service, version, envContext, routeOffer, true);\r
 150                         if(removeSelf) {\r
 151                                 for(int i=0;i<endpoints.length;++i) {\r
 152                                         if(endpoints[i].getPort()==thisPort && endpoints[i].getHost().equals(thisMachine))\r
 153                                                 endpoints[i]=null;\r
 154                                 }\r
 155                         }\r
 156                         return endpoints.length!=0;\r
 157                 } catch (Exception e) {\r
 158                         access.log(Level.ERROR, e.getMessage());\r
 159                 }\r
 160                 return false;\r
 161         }\r
 162 \r
 163         private String noEndpointsString() {\r
 164                 StringBuilder sb = new StringBuilder("No DME2 Endpoints found for ");\r
 165                 sb.append(service);\r
 166                 sb.append('/');\r
 167                 sb.append(version);\r
 168                 sb.append('/');\r
 169                 sb.append(envContext);\r
 170                 sb.append('/');\r
 171                 sb.append(routeOffer);\r
 172                 return sb.toString();\r
 173         }\r
 174 \r
 175         @Override\r
 176         public URI get(Locator.Item item) throws LocatorException {\r
 177                 if(!hasItems()) \r
 178                         throw new LocatorException(noEndpointsString());\r
 179                 if(item == null) \r
 180                         return null;\r
 181 \r
 182                 Item li = ((Item)item);\r
 183                 // if URI has been created, use it\r
 184                 if(li.uri!=null)return li.uri;\r
 185         \r
 186                 // URI not created, create it\r
 187                 if(li.idx<endpoints.length) {\r
 188                         DME2Endpoint de = endpoints[li.idx];\r
 189                         if(de!=null) {\r
 190                                 try {\r
 191                                         return li.uri=new URI(de.getProtocol(),null,de.getHost(),de.getPort(),pathInfo,null,null);\r
 192                                 } catch (URISyntaxException e) {\r
 193                                         throw new LocatorException(e);\r
 194                                 }\r
 195                         }\r
 196                 }\r
 197                 return null;\r
 198         }\r
 199         \r
 200         @Override\r
 201         public boolean hasItems() {\r
 202                 return endpoints!=null && endpoints.length>0;\r
 203         }\r
 204 \r
 205         @Override\r
 206         public void invalidate(Locator.Item item) throws LocatorException {\r
 207                 if(item instanceof Item) {\r
 208                         int idx = ((Item)item).idx;\r
 209                         if(idx<endpoints.length) {\r
 210                                 DME2Endpoint uhoh = endpoints[idx]; // Sometimes, DME2Endpoint, at least on File system, returns bogus entries.\r
 211                                 endpoints[idx]=null;\r
 212                                 boolean noneLeft=true;\r
 213                                 for(int i=0;i<endpoints.length && noneLeft;++i) {\r
 214                                         noneLeft = endpoints[i]==null;\r
 215                                 }\r
 216                                 if(noneLeft && refresh()) { // make sure DME2 isn't giving us the same invalidated entry...\r
 217                                         for(int i=0;i<endpoints.length && noneLeft;++i) {\r
 218                                                 DME2Endpoint ep = endpoints[i];\r
 219                                                 if(ep != null && \r
 220                                                    ep.getHost().equals(uhoh.getHost()) &&\r
 221                                                    ep.getPort()==uhoh.getPort()) {\r
 222                                                          endpoints[i]=null;\r
 223                                                 }\r
 224                                         }\r
 225                                 }\r
 226                                 \r
 227                         }\r
 228                 }\r
 229         }\r
 230 \r
 231         public class Item implements Locator.Item {\r
 232                 private final int idx;\r
 233                 private URI uri;\r
 234                 private Item(int i) {\r
 235                         idx = i;\r
 236                         uri = null;\r
 237                 }\r
 238         }\r
 239 \r
 240         @Override\r
 241         public Item best() throws LocatorException {\r
 242                 if(!hasItems()) // checks endpoints\r
 243                         if(!refresh()) throw new LocatorException("No DME2 Endpoints Available");\r
 244                 \r
 245                 // Some endpoints in Array are null.  Need sub array of usable endpoints\r
 246                 int usable[] = new int[endpoints.length];\r
 247                 int count=0;\r
 248                 for(int i=0;i<endpoints.length;++i) {\r
 249                         if(endpoints[i]!=null) {\r
 250                                 usable[count++] = i;\r
 251                         }\r
 252                 }\r
 253                 switch(count) {\r
 254                         case 0: refresh(); return null;\r
 255                         case 1: return new Item(usable[0]);\r
 256                         default:\r
 257                                 int samemach[] = new int[count];\r
 258                                 int samecount = 0,closecount=0;\r
 259                                 // has to be sortable\r
 260                                 Integer closemach[] = new Integer[count];\r
 261                                 \r
 262                                 // Analyze for Same Machine or Remote machines\r
 263                                 for(int i=0;i<count;++i) {\r
 264                                         DME2Endpoint ep = endpoints[usable[i]];\r
 265                                         String host = ep.getHost();\r
 266                                         if(thisMachine.equalsIgnoreCase(host)) {\r
 267                                                 samemach[samecount++] = usable[i];\r
 268                                         } else {\r
 269                                                 closemach[closecount++] = usable[i];\r
 270                                         }\r
 271                                 }\r
 272                                 \r
 273                                 switch(samecount) {\r
 274                                         case 0: break;\r
 275                                         case 1: return new Item(samemach[0]);\r
 276                                         default: // return randomized is multiple Endpoints on local machine.\r
 277                                                 int i = random.nextInt();\r
 278                                                 return new Item(usable[Math.abs(i%samecount)]);\r
 279                                 }\r
 280                                 \r
 281                                 // Analyze for closest remote\r
 282                                 switch(closecount) {\r
 283                                         case 0: return null;\r
 284                                         case 1: return new Item(closemach[0]);\r
 285                                         default: // return closest machine\r
 286                                                 DoubIndex remote[] = new DoubIndex[closecount];\r
 287                                                 int remotecount = 0;\r
 288                                                 for(int i=0;i<closecount;++i) {\r
 289                                                         DME2Endpoint de = endpoints[usable[i]];\r
 290                                                         remote[remotecount++] = new DoubIndex(de.getDistance(),i);\r
 291                                                 }\r
 292                                                 Arrays.sort(remote,new Comparator<DoubIndex> () {\r
 293                                                         @Override\r
 294                                                         public int compare(DoubIndex a, DoubIndex b) {\r
 295                                                                 if(a.d<b.d) return -1;\r
 296                                                                 if(a.d>b.d) return 1;\r
 297                                                                 return (random.nextInt()%1)==0?1:0;// randomize if the same\r
 298                                                         }\r
 299                                                         \r
 300                                                 });\r
 301                                                 return new Item(remote[0].idx);\r
 302                                 }\r
 303                 }\r
 304         }\r
 305         \r
 306         private class DoubIndex {\r
 307                 public final double d;\r
 308                 public final int idx;\r
 309                 \r
 310                 public DoubIndex(double doub, int i) {\r
 311                         d = doub;\r
 312                         idx = i;\r
 313                 }\r
 314         }\r
 315         @Override\r
 316         public Item first() {\r
 317                 if(endpoints==null)return null;\r
 318                 for(int i=0;i<endpoints.length;++i) {\r
 319                         if(endpoints[i]!=null)\r
 320                                 return new Item(i); \r
 321                 }\r
 322                 return null;\r
 323         }\r
 324 \r
 325         @Override\r
 326         public Item next(Locator.Item item) throws LocatorException {\r
 327                 if(endpoints==null || endpoints.length==0 || !(item instanceof Item))return null;\r
 328                 int idx = ((Item)item).idx +1;\r
 329                 for(int i=idx;i<endpoints.length;++i) {\r
 330                         if(endpoints[i]!=null)\r
 331                                 return new Item(i); \r
 332                 }\r
 333 // This is a mistake..  will start infinite loops\r
 334 //              // Did not have any at end... try beginning\r
 335 //              for(int i=0;i<idx-1;++i) {\r
 336 //                      if(endpoints[i]!=null)\r
 337 //                              return new Item(i); \r
 338 //              }\r
 339 //              // If still nothing, refresh\r
 340 //              refresh();\r
 341                 return null;\r
 342         }\r
 343 \r
 344         @Override\r
 345         public void destroy() {\r
 346                 // TODO Auto-generated method stub\r
 347                 \r
 348         }\r
 349 }\r