src/main/java/net/pterodactylus/sone/freenet/wot/IdentityManager.java

   1 /*
   2  * Sone - IdentityManager.java - Copyright © 2010–2013 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.freenet.wot;
  19
  20 import static com.google.common.base.Optional.fromNullable;
  21 import static com.google.common.collect.HashMultimap.create;
  22
  23 import java.util.HashSet;
  24 import java.util.Set;
  25 import java.util.logging.Level;
  26 import java.util.logging.Logger;
  27
  28 import net.pterodactylus.sone.freenet.plugin.PluginException;
  29 import net.pterodactylus.util.logging.Logging;
  30 import net.pterodactylus.util.service.AbstractService;
  31
  32 import com.google.common.collect.Multimap;
  33 import com.google.common.collect.Sets;
  34 import com.google.common.eventbus.EventBus;
  35 import com.google.inject.Inject;
  36 import com.google.inject.name.Named;
  37
  38 /**
  39  * The identity manager takes care of loading and storing identities, their
  40  * contexts, and properties. It does so in a way that does not expose errors via
  41  * exceptions but it only logs them and tries to return sensible defaults.
  42  * <p>
  43  * It is also responsible for polling identities from the Web of Trust plugin
  44  * and sending events to the {@link EventBus} when {@link Identity}s and
  45  * {@link OwnIdentity}s are discovered or disappearing.
  46  *
  47  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  48  */
  49 public class IdentityManager extends AbstractService {
  50
  51         /** The logger. */
  52         private static final Logger logger = Logging.getLogger(IdentityManager.class);
  53
  54         /** The event bus. */
  55         private final EventBus eventBus;
  56
  57         private final IdentityLoader identityLoader;
  58
  59         /** The Web of Trust connector. */
  60         private final WebOfTrustConnector webOfTrustConnector;
  61
  62         /** The currently known own identities. */
  63         private final Set<OwnIdentity> currentOwnIdentities = Sets.newHashSet();
  64
  65         /**
  66          * Creates a new identity manager.
  67          *
  68          * @param eventBus
  69          *            The event bus
  70          * @param webOfTrustConnector
  71          *            The Web of Trust connector
  72          * @param context
  73          *            The context to focus on (may be {@code null} to ignore
  74          *            contexts)
  75          */
  76         @Inject
  77         public IdentityManager(EventBus eventBus, WebOfTrustConnector webOfTrustConnector, @Named("WebOfTrustContext") String context) {
  78                 super("Sone Identity Manager", false);
  79                 this.eventBus = eventBus;
  80                 this.webOfTrustConnector = webOfTrustConnector;
  81                 this.identityLoader = new IdentityLoader(webOfTrustConnector, fromNullable(context));
  82         }
  83
  84         //
  85         // ACCESSORS
  86         //
  87
  88         /**
  89          * Returns whether the Web of Trust plugin could be reached during the last
  90          * try.
  91          *
  92          * @return {@code true} if the Web of Trust plugin is connected,
  93          *         {@code false} otherwise
  94          */
  95         public boolean isConnected() {
  96                 try {
  97                         webOfTrustConnector.ping();
  98                         return true;
  99                 } catch (PluginException pe1) {
 100                         /* not connected, ignore. */
 101                         return false;
 102                 }
 103         }
 104
 105         /**
 106          * Returns all own identities.
 107          *
 108          * @return All own identities
 109          */
 110         public Set<OwnIdentity> getAllOwnIdentities() {
 111                 synchronized (currentOwnIdentities) {
 112                         return new HashSet<OwnIdentity>(currentOwnIdentities);
 113                 }
 114         }
 115
 116         //
 117         // SERVICE METHODS
 118         //
 119
 120         /**
 121          * {@inheritDoc}
 122          */
 123         @Override
 124         protected void serviceRun() {
 125                 Multimap<OwnIdentity, Identity> oldIdentities = create();
 126
 127                 while (!shouldStop()) {
 128                         try {
 129                                 Multimap<OwnIdentity, Identity> currentIdentities = identityLoader.loadIdentities();
 130
 131                                 IdentityChangeEventSender identityChangeEventSender = new IdentityChangeEventSender(eventBus, oldIdentities);
 132                                 identityChangeEventSender.detectChanges(currentIdentities);
 133
 134                                 oldIdentities = currentIdentities;
 135
 136                                 synchronized (currentOwnIdentities) {
 137                                         currentOwnIdentities.clear();
 138                                         currentOwnIdentities.addAll(currentIdentities.keySet());
 139                                 }
 140                         } catch (WebOfTrustException wote1) {
 141                                 logger.log(Level.WARNING, "WoT has disappeared!", wote1);
 142                         }
 143
 144                         /* wait a minute before checking again. */
 145                         sleep(60 * 1000);
 146                 }
 147         }
 148
 149 }