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.HashMap;
  24 import java.util.logging.Level;
  25 import java.util.logging.Logger;
  26
  27 import net.pterodactylus.sone.data.Sone;
  28 import net.pterodactylus.sone.freenet.StringBucket;
  29 import net.pterodactylus.util.io.Closer;
  30 import net.pterodactylus.util.logging.Logging;
  31 import net.pterodactylus.util.service.AbstractService;
  32 import net.pterodactylus.util.template.DefaultTemplateFactory;
  33 import net.pterodactylus.util.template.ReflectionAccessor;
  34 import net.pterodactylus.util.template.Template;
  35 import net.pterodactylus.util.template.TemplateException;
  36 import freenet.client.async.ManifestElement;
  37 import freenet.keys.FreenetURI;
  38
  39 /**
  40  * A Sone inserter is responsible for inserting a Sone if it has changed.
  41  *
  42  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  43  */
  44 public class SoneInserter extends AbstractService {
  45
  46         /** The logger. */
  47         private static final Logger logger = Logging.getLogger(SoneInserter.class);
  48
  49         /** The template factory used to create the templates. */
  50         private static final DefaultTemplateFactory templateFactory = new DefaultTemplateFactory();
  51
  52         static {
  53                 templateFactory.addAccessor(Object.class, new ReflectionAccessor());
  54         }
  55
  56         /** The UTF-8 charset. */
  57         private static final Charset utf8Charset = Charset.forName("UTF-8");
  58
  59         /** The Freenet interface. */
  60         private final FreenetInterface freenetInterface;
  61
  62         /** The Sone to insert. */
  63         private final Sone sone;
  64
  65         /**
  66          * Creates a new Sone inserter.
  67          *
  68          * @param freenetInterface
  69          *            The freenet interface
  70          * @param sone
  71          *            The Sone to insert
  72          */
  73         public SoneInserter(FreenetInterface freenetInterface, Sone sone) {
  74                 super("Sone Inserter for “" + sone.getName() + "”");
  75                 this.freenetInterface = freenetInterface;
  76                 this.sone = sone;
  77         }
  78
  79         //
  80         // SERVICE METHODS
  81         //
  82
  83         /**
  84          * {@inheritDoc}
  85          */
  86         @Override
  87         protected void serviceRun() {
  88                 long modificationCounter = 0;
  89                 boolean restartNow = true;
  90                 while (!shouldStop()) {
  91                         if (!restartNow) {
  92                                 logger.log(Level.FINEST, "Waiting 60 seconds before checking Sone “" + sone.getName() + "”.");
  93                                 sleep(60 * 1000);
  94                         }
  95                         restartNow = false;
  96                         InsertInformation insertInformation = null;
  97                         synchronized (sone) {
  98                                 modificationCounter = sone.getModificationCounter();
  99                                 if (modificationCounter > 0) {
 100                                         insertInformation = new InsertInformation(sone.getRequestUri(), sone.getInsertUri());
 101                                 }
 102                         }
 103                         if (insertInformation != null) {
 104                                 logger.log(Level.INFO, "Inserting Sone “%s”…", new Object[] { sone.getName() });
 105
 106                                 boolean success = false;
 107                                 try {
 108                                         FreenetURI finalUri = freenetInterface.insertDirectory(insertInformation.getInsertUri().setKeyType("USK").setDocName("Sone-" + sone.getName()).setSuggestedEdition(0), insertInformation.generateManifestEntries(), "index.html");
 109                                         success = true;
 110                                         logger.log(Level.INFO, "Inserted Sone “%s” at %s.", new Object[] { sone.getName(), finalUri });
 111                                 } catch (SoneException se1) {
 112                                         logger.log(Level.WARNING, "Could not insert Sone “" + sone.getName() + "”!", se1);
 113                                 }
 114
 115                                 /*
 116                                  * reset modification counter if Sone has not been modified
 117                                  * while it was inserted.
 118                                  */
 119                                 if (success) {
 120                                         synchronized (sone) {
 121                                                 if (sone.getModificationCounter() == modificationCounter) {
 122                                                         logger.log(Level.FINE, "Sone “%s” was not modified further, resetting counter…", new Object[] { sone });
 123                                                         sone.setModificationCounter(0);
 124                                                 } else {
 125                                                         logger.log(Level.FINE, "Sone “%s” was modified since the insert started, starting another insert…", new Object[] { sone });
 126                                                         restartNow = true;
 127                                                 }
 128                                         }
 129                                 }
 130                         }
 131                 }
 132         }
 133
 134         /**
 135          * Container for information that are required to insert a Sone. This
 136          * container merely exists to copy all relevant data without holding a lock
 137          * on the {@link Sone} object for too long.
 138          *
 139          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 140          */
 141         private class InsertInformation {
 142
 143                 /** The request URI of the Sone. */
 144                 private final FreenetURI requestUri;
 145
 146                 /** The insert URI of the Sone. */
 147                 private final FreenetURI insertUri;
 148
 149                 /**
 150                  * Creates a new insert information container.
 151                  *
 152                  * @param requestUri
 153                  *            The request URI of the Sone
 154                  * @param insertUri
 155                  *            The insert URI of the Sone
 156                  */
 157                 public InsertInformation(FreenetURI requestUri, FreenetURI insertUri) {
 158                         this.requestUri = requestUri;
 159                         this.insertUri = insertUri;
 160                 }
 161
 162                 //
 163                 // ACCESSORS
 164                 //
 165
 166                 /**
 167                  * Returns the request URI of the Sone.
 168                  *
 169                  * @return The request URI of the Sone
 170                  */
 171                 @SuppressWarnings("unused")
 172                 public FreenetURI getRequestUri() {
 173                         return requestUri;
 174                 }
 175
 176                 /**
 177                  * Returns the insert URI of the Sone.
 178                  *
 179                  * @return The insert URI of the Sone
 180                  */
 181                 public FreenetURI getInsertUri() {
 182                         return insertUri;
 183                 }
 184
 185                 //
 186                 // ACTIONS
 187                 //
 188
 189                 /**
 190                  * Generates all manifest entries required to insert this Sone.
 191                  *
 192                  * @return The manifest entries for the Sone insert
 193                  */
 194                 public HashMap<String, Object> generateManifestEntries() {
 195                         HashMap<String, Object> manifestEntries = new HashMap<String, Object>();
 196
 197                         /* first, create an index.html. */
 198                         manifestEntries.put("index.html", createManifestElement("index.html", "text/html; charset=utf-8", "/templates/insert/index.html"));
 199
 200                         /* now, store the sone. */
 201                         manifestEntries.put("sone.xml", createManifestElement("sone.xml", "text/xml; charset=utf-8", "/templates/insert/sone.xml"));
 202
 203                         return manifestEntries;
 204                 }
 205
 206                 //
 207                 // PRIVATE METHODS
 208                 //
 209
 210                 /**
 211                  * Creates a new manifest element.
 212                  *
 213                  * @param name
 214                  *            The name of the file
 215                  * @param contentType
 216                  *            The content type of the file
 217                  * @param templateName
 218                  *            The name of the template to render
 219                  * @return The manifest element
 220                  */
 221                 @SuppressWarnings("synthetic-access")
 222                 private ManifestElement createManifestElement(String name, String contentType, String templateName) {
 223                         InputStreamReader templateInputStreamReader;
 224                         Template template = templateFactory.createTemplate(templateInputStreamReader = new InputStreamReader(getClass().getResourceAsStream(templateName), utf8Charset));
 225                         try {
 226                                 template.parse();
 227                         } catch (TemplateException te1) {
 228                                 logger.log(Level.SEVERE, "Could not parse template “" + templateName + "”!", te1);
 229                                 return null;
 230                         } finally {
 231                                 Closer.close(templateInputStreamReader);
 232                         }
 233                         template.set("currentSone", sone);
 234                         StringWriter writer = new StringWriter();
 235                         StringBucket bucket = null;
 236                         try {
 237                                 template.render(writer);
 238                                 bucket = new StringBucket(writer.toString(), utf8Charset);
 239                                 return new ManifestElement(name, bucket, contentType, bucket.size());
 240                         } catch (TemplateException te1) {
 241                                 logger.log(Level.SEVERE, "Could not render template “" + templateName + "”!", te1);
 242                                 return null;
 243                         } finally {
 244                                 Closer.close(writer);
 245                                 if (bucket != null) {
 246                                         bucket.free();
 247                                 }
 248                         }
 249                 }
 250
 251         }
 252
 253 }