src/main/java/net/pterodactylus/sone/core/SoneInserter.java

   1 /*
   2  * FreenetSone - SoneInserter.java - Copyright © 2010 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.sone.core;
  19
  20 import java.io.InputStreamReader;
  21 import java.io.StringWriter;
  22 import java.nio.charset.Charset;
  23 import java.util.ArrayList;
  24 import java.util.Collection;
  25 import java.util.HashMap;
  26 import java.util.HashSet;
  27 import java.util.Map;
  28 import java.util.Set;
  29 import java.util.logging.Level;
  30 import java.util.logging.Logger;
  31
  32 import net.pterodactylus.sone.core.Core.SoneStatus;
  33 import net.pterodactylus.sone.data.Post;
  34 import net.pterodactylus.sone.data.Reply;
  35 import net.pterodactylus.sone.data.Sone;
  36 import net.pterodactylus.sone.freenet.StringBucket;
  37 import net.pterodactylus.util.filter.Filter;
  38 import net.pterodactylus.util.filter.Filters;
  39 import net.pterodactylus.util.io.Closer;
  40 import net.pterodactylus.util.logging.Logging;
  41 import net.pterodactylus.util.service.AbstractService;
  42 import net.pterodactylus.util.template.DefaultTemplateFactory;
  43 import net.pterodactylus.util.template.ReflectionAccessor;
  44 import net.pterodactylus.util.template.Template;
  45 import net.pterodactylus.util.template.TemplateException;
  46 import net.pterodactylus.util.template.XmlFilter;
  47 import freenet.client.async.ManifestElement;
  48 import freenet.keys.FreenetURI;
  49
  50 /**
  51  * A Sone inserter is responsible for inserting a Sone if it has changed.
  52  *
  53  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  54  */
  55 public class SoneInserter extends AbstractService {
  56
  57         /** The logger. */
  58         private static final Logger logger = Logging.getLogger(SoneInserter.class);
  59
  60         /** The template factory used to create the templates. */
  61         private static final DefaultTemplateFactory templateFactory = new DefaultTemplateFactory();
  62
  63         static {
  64                 templateFactory.addAccessor(Object.class, new ReflectionAccessor());
  65                 templateFactory.addFilter("xml", new XmlFilter());
  66         }
  67
  68         /** The UTF-8 charset. */
  69         private static final Charset utf8Charset = Charset.forName("UTF-8");
  70
  71         /** The core. */
  72         private final Core core;
  73
  74         /** The Freenet interface. */
  75         private final FreenetInterface freenetInterface;
  76
  77         /** The Sone to insert. */
  78         private final Sone sone;
  79
  80         /**
  81          * Creates a new Sone inserter.
  82          *
  83          * @param core
  84          *            The core
  85          * @param freenetInterface
  86          *            The freenet interface
  87          * @param sone
  88          *            The Sone to insert
  89          */
  90         public SoneInserter(Core core, FreenetInterface freenetInterface, Sone sone) {
  91                 super("Sone Inserter for “" + sone.getName() + "”");
  92                 this.core = core;
  93                 this.freenetInterface = freenetInterface;
  94                 this.sone = sone;
  95         }
  96
  97         //
  98         // SERVICE METHODS
  99         //
 100
 101         /**
 102          * {@inheritDoc}
 103          */
 104         @Override
 105         protected void serviceRun() {
 106                 long modificationCounter = 0;
 107                 boolean restartNow = true;
 108                 while (!shouldStop()) {
 109                         if (!restartNow) {
 110                                 logger.log(Level.FINEST, "Waiting 60 seconds before checking Sone “" + sone.getName() + "”.");
 111                                 sleep(60 * 1000);
 112                         }
 113                         restartNow = false;
 114                         InsertInformation insertInformation = null;
 115                         synchronized (sone) {
 116                                 modificationCounter = sone.getModificationCounter();
 117                                 if (modificationCounter > 0) {
 118                                         sone.setTime(System.currentTimeMillis());
 119                                         insertInformation = new InsertInformation(sone);
 120                                 }
 121                         }
 122                         if (insertInformation != null) {
 123                                 logger.log(Level.INFO, "Inserting Sone “%s”…", new Object[] { sone.getName() });
 124
 125                                 boolean success = false;
 126                                 try {
 127                                         core.setSoneStatus(sone, SoneStatus.inserting);
 128                                         FreenetURI finalUri = freenetInterface.insertDirectory(insertInformation.getInsertUri().setKeyType("USK").setDocName("Sone-" + sone.getName()).setSuggestedEdition(0), insertInformation.generateManifestEntries(), "index.html");
 129                                         sone.updateUris(finalUri);
 130                                         success = true;
 131                                         logger.log(Level.INFO, "Inserted Sone “%s” at %s.", new Object[] { sone.getName(), finalUri });
 132                                 } catch (SoneException se1) {
 133                                         logger.log(Level.WARNING, "Could not insert Sone “" + sone.getName() + "”!", se1);
 134                                 } finally {
 135                                         core.setSoneStatus(sone, SoneStatus.idle);
 136                                 }
 137
 138                                 /*
 139                                  * reset modification counter if Sone has not been modified
 140                                  * while it was inserted.
 141                                  */
 142                                 if (success) {
 143                                         synchronized (sone) {
 144                                                 if (sone.getModificationCounter() == modificationCounter) {
 145                                                         logger.log(Level.FINE, "Sone “%s” was not modified further, resetting counter…", new Object[] { sone });
 146                                                         sone.setModificationCounter(0);
 147                                                 } else {
 148                                                         logger.log(Level.FINE, "Sone “%s” was modified since the insert started, starting another insert…", new Object[] { sone });
 149                                                         restartNow = true;
 150                                                 }
 151                                         }
 152                                 }
 153                         }
 154                 }
 155         }
 156
 157         /**
 158          * Container for information that are required to insert a Sone. This
 159          * container merely exists to copy all relevant data without holding a lock
 160          * on the {@link Sone} object for too long.
 161          *
 162          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 163          */
 164         private class InsertInformation {
 165
 166                 /** All properties of the Sone, copied for thread safety. */
 167                 private final Map<String, Object> soneProperties = new HashMap<String, Object>();
 168
 169                 /**
 170                  * Creates a new insert information container.
 171                  *
 172                  * @param sone
 173                  *            The sone to insert
 174                  */
 175                 public InsertInformation(Sone sone) {
 176                         soneProperties.put("id", sone.getId());
 177                         soneProperties.put("name", sone.getName());
 178                         soneProperties.put("time", sone.getTime());
 179                         soneProperties.put("requestUri", sone.getRequestUri());
 180                         soneProperties.put("insertUri", sone.getInsertUri());
 181                         soneProperties.put("profile", sone.getProfile());
 182                         soneProperties.put("posts", new ArrayList<Post>(sone.getPosts()));
 183                         soneProperties.put("replies", new HashSet<Reply>(sone.getReplies()));
 184                         soneProperties.put("friends", new HashSet<Sone>(sone.getFriends()));
 185                         soneProperties.put("blockedSoneIds", new HashSet<String>(sone.getBlockedSoneIds()));
 186                 }
 187
 188                 //
 189                 // ACCESSORS
 190                 //
 191
 192                 /**
 193                  * Returns the insert URI of the Sone.
 194                  *
 195                  * @return The insert URI of the Sone
 196                  */
 197                 public FreenetURI getInsertUri() {
 198                         return (FreenetURI) soneProperties.get("insertUri");
 199                 }
 200
 201                 //
 202                 // ACTIONS
 203                 //
 204
 205                 /**
 206                  * Generates all manifest entries required to insert this Sone.
 207                  *
 208                  * @return The manifest entries for the Sone insert
 209                  */
 210                 public HashMap<String, Object> generateManifestEntries() {
 211                         HashMap<String, Object> manifestEntries = new HashMap<String, Object>();
 212
 213                         /* first, create an index.html. */
 214                         manifestEntries.put("index.html", createManifestElement("index.html", "text/html; charset=utf-8", "/templates/insert/index.html"));
 215
 216                         /* now, store the sone. */
 217                         manifestEntries.put("sone.xml", createManifestElement("sone.xml", "text/xml; charset=utf-8", "/templates/insert/sone.xml"));
 218
 219                         return manifestEntries;
 220                 }
 221
 222                 //
 223                 // PRIVATE METHODS
 224                 //
 225
 226                 /**
 227                  * Creates a new manifest element.
 228                  *
 229                  * @param name
 230                  *            The name of the file
 231                  * @param contentType
 232                  *            The content type of the file
 233                  * @param templateName
 234                  *            The name of the template to render
 235                  * @return The manifest element
 236                  */
 237                 @SuppressWarnings("synthetic-access")
 238                 private ManifestElement createManifestElement(String name, String contentType, String templateName) {
 239                         InputStreamReader templateInputStreamReader;
 240                         Template template = templateFactory.createTemplate(templateInputStreamReader = new InputStreamReader(getClass().getResourceAsStream(templateName), utf8Charset));
 241                         try {
 242                                 template.parse();
 243                         } catch (TemplateException te1) {
 244                                 logger.log(Level.SEVERE, "Could not parse template “" + templateName + "”!", te1);
 245                                 return null;
 246                         } finally {
 247                                 Closer.close(templateInputStreamReader);
 248                         }
 249                         @SuppressWarnings("unchecked")
 250                         final Set<String> blockedSoneIds = (Set<String>) soneProperties.get("blockedSoneIds");
 251                         Collection<Sone> knownSones = Filters.filteredCollection(core.getKnownSones(), new Filter<Sone>() {
 252
 253                                 /**
 254                                  * {@inheritDoc}
 255                                  */
 256                                 @Override
 257                                 public boolean filterObject(Sone object) {
 258                                         return !blockedSoneIds.contains(object.getId()) && !object.getId().equals(soneProperties.get("id"));
 259                                 }
 260                         });
 261
 262                         template.set("currentSone", soneProperties);
 263                         template.set("knownSones", knownSones);
 264                         StringWriter writer = new StringWriter();
 265                         StringBucket bucket = null;
 266                         try {
 267                                 template.render(writer);
 268                                 bucket = new StringBucket(writer.toString(), utf8Charset);
 269                                 return new ManifestElement(name, bucket, contentType, bucket.size());
 270                         } catch (TemplateException te1) {
 271                                 logger.log(Level.SEVERE, "Could not render template “" + templateName + "”!", te1);
 272                                 return null;
 273                         } finally {
 274                                 Closer.close(writer);
 275                                 if (bucket != null) {
 276                                         bucket.free();
 277                                 }
 278                         }
 279                 }
 280
 281         }
 282
 283 }