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
  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 public class IdentityManager extends AbstractService {
  49
  50         /** The logger. */
  51         private static final Logger logger = Logging.getLogger(IdentityManager.class);
  52
  53         /** The event bus. */
  54         private final EventBus eventBus;
  55
  56         private final IdentityLoader identityLoader;
  57
  58         /** The Web of Trust connector. */
  59         private final WebOfTrustConnector webOfTrustConnector;
  60
  61         /** The currently known own identities. */
  62         private final Set<OwnIdentity> currentOwnIdentities = Sets.newHashSet();
  63
  64         /**
  65          * Creates a new identity manager.
  66          *
  67          * @param eventBus
  68          *            The event bus
  69          * @param webOfTrustConnector
  70          *            The Web of Trust connector
  71          * @param context
  72          *            The context to focus on (may be {@code null} to ignore
  73          *            contexts)
  74          */
  75         @Inject
  76         public IdentityManager(EventBus eventBus, WebOfTrustConnector webOfTrustConnector, Context context) {
  77                 super("Sone Identity Manager", false);
  78                 this.eventBus = eventBus;
  79                 this.webOfTrustConnector = webOfTrustConnector;
  80                 this.identityLoader = new IdentityLoader(webOfTrustConnector, fromNullable(context.getContext()));
  81         }
  82
  83         //
  84         // ACCESSORS
  85         //
  86
  87         /**
  88          * Returns whether the Web of Trust plugin could be reached during the last
  89          * try.
  90          *
  91          * @return {@code true} if the Web of Trust plugin is connected,
  92          *         {@code false} otherwise
  93          */
  94         public boolean isConnected() {
  95                 try {
  96                         webOfTrustConnector.ping();
  97                         return true;
  98                 } catch (PluginException pe1) {
  99                         /* not connected, ignore. */
 100                         return false;
 101                 }
 102         }
 103
 104         /**
 105          * Returns all own identities.
 106          *
 107          * @return All own identities
 108          */
 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                 Multimap<OwnIdentity, Identity> oldIdentities = create();
 125
 126                 while (!shouldStop()) {
 127                         try {
 128                                 Multimap<OwnIdentity, 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 }