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