Extract identity manager interface.

[Sone.git] / src / main / java / net / pterodactylus / sone / freenet / wot / IdentityManagerImpl.java

diff --git a/src/main/java/net/pterodactylus/sone/freenet/wot/IdentityManagerImpl.java b/src/main/java/net/pterodactylus/sone/freenet/wot/IdentityManagerImpl.java
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+/*
+ * Sone - IdentityManager.java - Copyright © 2010–2013 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sone.freenet.wot;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import net.pterodactylus.sone.freenet.plugin.PluginException;
+import net.pterodactylus.util.logging.Logging;
+import net.pterodactylus.util.service.AbstractService;
+
+import com.google.common.collect.Sets;
+import com.google.common.eventbus.EventBus;
+import com.google.inject.Inject;
+
+/**
+ * The identity manager takes care of loading and storing identities, their
+ * contexts, and properties. It does so in a way that does not expose errors via
+ * exceptions but it only logs them and tries to return sensible defaults.
+ * <p>
+ * It is also responsible for polling identities from the Web of Trust plugin
+ * and sending events to the {@link EventBus} when {@link Identity}s and
+ * {@link OwnIdentity}s are discovered or disappearing.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class IdentityManagerImpl extends AbstractService implements IdentityManager {
+
+       /** The logger. */
+       private static final Logger logger = Logging.getLogger(IdentityManagerImpl.class);
+
+       /** The event bus. */
+       private final EventBus eventBus;
+
+       private final IdentityLoader identityLoader;
+
+       /** The Web of Trust connector. */
+       private final WebOfTrustConnector webOfTrustConnector;
+
+       /** The currently known own identities. */
+       private final Set<OwnIdentity> currentOwnIdentities = Sets.newHashSet();
+
+       /**
+        * Creates a new identity manager.
+        *
+        * @param eventBus
+        *            The event bus
+        * @param webOfTrustConnector
+        *            The Web of Trust connector
+        */
+       @Inject
+       public IdentityManagerImpl(EventBus eventBus, WebOfTrustConnector webOfTrustConnector, IdentityLoader identityLoader) {
+               super("Sone Identity Manager", false);
+               this.eventBus = eventBus;
+               this.webOfTrustConnector = webOfTrustConnector;
+               this.identityLoader = identityLoader;
+       }
+
+       //
+       // ACCESSORS
+       //
+
+       /**
+        * Returns whether the Web of Trust plugin could be reached during the last
+        * try.
+        *
+        * @return {@code true} if the Web of Trust plugin is connected,
+        *         {@code false} otherwise
+        */
+       @Override
+       public boolean isConnected() {
+               try {
+                       webOfTrustConnector.ping();
+                       return true;
+               } catch (PluginException pe1) {
+                       /* not connected, ignore. */
+                       return false;
+               }
+       }
+
+       /**
+        * Returns all own identities.
+        *
+        * @return All own identities
+        */
+       @Override
+       public Set<OwnIdentity> getAllOwnIdentities() {
+               synchronized (currentOwnIdentities) {
+                       return new HashSet<OwnIdentity>(currentOwnIdentities);
+               }
+       }
+
+       //
+       // SERVICE METHODS
+       //
+
+       /**
+        * {@inheritDoc}
+        */
+       @Override
+       protected void serviceRun() {
+               Map<OwnIdentity, Collection<Identity>> oldIdentities = new HashMap<OwnIdentity, Collection<Identity>>();
+
+               while (!shouldStop()) {
+                       try {
+                               Map<OwnIdentity, Collection<Identity>> currentIdentities = identityLoader.loadIdentities();
+
+                               IdentityChangeEventSender identityChangeEventSender = new IdentityChangeEventSender(eventBus, oldIdentities);
+                               identityChangeEventSender.detectChanges(currentIdentities);
+
+                               oldIdentities = currentIdentities;
+
+                               synchronized (currentOwnIdentities) {
+                                       currentOwnIdentities.clear();
+                                       currentOwnIdentities.addAll(currentIdentities.keySet());
+                               }
+                       } catch (WebOfTrustException wote1) {
+                               logger.log(Level.WARNING, "WoT has disappeared!", wote1);
+                       }
+
+                       /* wait a minute before checking again. */
+                       sleep(60 * 1000);
+               }
+       }
+
+}