freenet/wot/IdentityManagerImpl.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 java.util.Collection;
  21 import java.util.HashMap;
  22 import java.util.HashSet;
  23 import java.util.Map;
  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.Sets;
  33 import com.google.common.eventbus.EventBus;
  34 import com.google.inject.Inject;
  35 import com.google.inject.Singleton;
  36
  37 /**
  38  * The identity manager takes care of loading and storing identities, their
  39  * contexts, and properties. It does so in a way that does not expose errors via
  40  * exceptions but it only logs them and tries to return sensible defaults.
  41  * <p>
  42  * It is also responsible for polling identities from the Web of Trust plugin
  43  * and sending events to the {@link EventBus} when {@link Identity}s and
  44  * {@link OwnIdentity}s are discovered or disappearing.
  45  *
  46  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  47  */
  48 @Singleton
  49 public class IdentityManagerImpl extends AbstractService implements IdentityManager {
  50
  51         /** The logger. */
  52         private static final Logger logger = Logging.getLogger(IdentityManagerImpl.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          */
  73         @Inject
  74         public IdentityManagerImpl(EventBus eventBus, WebOfTrustConnector webOfTrustConnector, IdentityLoader identityLoader) {
  75                 super("Sone Identity Manager", false);
  76                 this.eventBus = eventBus;
  77                 this.webOfTrustConnector = webOfTrustConnector;
  78                 this.identityLoader = identityLoader;
  79         }
  80
  81         //
  82         // ACCESSORS
  83         //
  84
  85         /**
  86          * Returns whether the Web of Trust plugin could be reached during the last
  87          * try.
  88          *
  89          * @return {@code true} if the Web of Trust plugin is connected,
  90          *         {@code false} otherwise
  91          */
  92         @Override
  93         public boolean isConnected() {
  94                 try {
  95                         webOfTrustConnector.ping();
  96                         return true;
  97                 } catch (PluginException pe1) {
  98                         /* not connected, ignore. */
  99                         return false;
 100                 }
 101         }
 102
 103         /**
 104          * Returns all own identities.
 105          *
 106          * @return All own identities
 107          */
 108         @Override
 109         public Set<OwnIdentity> getAllOwnIdentities() {
 110                 synchronized (currentOwnIdentities) {
 111                         return new HashSet<OwnIdentity>(currentOwnIdentities);
 112                 }
 113         }
 114
 115         //
 116         // SERVICE METHODS
 117         //
 118
 119         /**
 120          * {@inheritDoc}
 121          */
 122         @Override
 123         protected void serviceRun() {
 124                 Map<OwnIdentity, Collection<Identity>> oldIdentities = new HashMap<OwnIdentity, Collection<Identity>>();
 125
 126                 while (!shouldStop()) {
 127                         try {
 128                                 Map<OwnIdentity, Collection<Identity>> currentIdentities = identityLoader.loadIdentities();
 129
 130                                 IdentityChangeEventSender identityChangeEventSender = new IdentityChangeEventSender(eventBus, oldIdentities);
 131                                 identityChangeEventSender.detectChanges(currentIdentities);
 132
 133                                 oldIdentities = currentIdentities;
 134
 135                                 synchronized (currentOwnIdentities) {
 136                                         currentOwnIdentities.clear();
 137                                         currentOwnIdentities.addAll(currentIdentities.keySet());
 138                                 }
 139                         } catch (WebOfTrustException wote1) {
 140                                 logger.log(Level.WARNING, "WoT has disappeared!", wote1);
 141                         }
 142
 143                         /* wait a minute before checking again. */
 144                         sleep(60 * 1000);
 145                 }
 146         }
 147
 148 }