Add support for pending contacts to connection registry.

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/ConnectionRegistry.java

 package org.briarproject.bramble.api.plugin;
 
 import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.contact.PendingContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.event.ConnectionClosedEvent;
+import org.briarproject.bramble.api.plugin.event.ConnectionOpenedEvent;
+import org.briarproject.bramble.api.plugin.event.ContactConnectedEvent;
+import org.briarproject.bramble.api.plugin.event.ContactDisconnectedEvent;
+import org.briarproject.bramble.api.rendezvous.event.RendezvousConnectionClosedEvent;
+import org.briarproject.bramble.api.rendezvous.event.RendezvousConnectionOpenedEvent;
 
 import java.util.Collection;
 
@@ -11,13 +18,50 @@ import java.util.Collection;
 @NotNullByDefault
 public interface ConnectionRegistry {
 
+	/**
+	 * Registers a connection with the given contact over the given transport.
+	 * Broadcasts {@link ConnectionOpenedEvent}. Also broadcasts
+	 * {@link ContactConnectedEvent} if this is the only connection with the
+	 * contact.
+	 */
 	void registerConnection(ContactId c, TransportId t, boolean incoming);
 
+	/**
+	 * Unregisters a connection with the given contact over the given transport.
+	 * Broadcasts {@link ConnectionClosedEvent}. Also broadcasts
+	 * {@link ContactDisconnectedEvent} if this is the only connection with
+	 * the contact.
+	 */
 	void unregisterConnection(ContactId c, TransportId t, boolean incoming);
 
+	/**
+	 * Returns any contacts that are connected via the given transport.
+	 */
 	Collection<ContactId> getConnectedContacts(TransportId t);
 
+	/**
+	 * Returns true if the given contact is connected via the given transport.
+	 */
 	boolean isConnected(ContactId c, TransportId t);
 
+	/**
+	 * Returns true if the given contact is connected via any transport.
+	 */
 	boolean isConnected(ContactId c);
+
+	/**
+	 * Registers a connection with the given pending contact. Broadcasts
+	 * {@link RendezvousConnectionOpenedEvent} if this is the only connection
+	 * with the pending contact.
+	 *
+	 * @return True if this is the only connection with the pending contact,
+	 * false if it is redundant and should be closed
+	 */
+	boolean registerConnection(PendingContactId p);
+
+	/**
+	 * Unregisters a connection with the given pending contact. Broadcasts
+	 * {@link RendezvousConnectionClosedEvent}.
+	 */
+	void unregisterConnection(PendingContactId p, boolean success);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/rendezvous/event/RendezvousConnectionClosedEvent.java

+package org.briarproject.bramble.api.rendezvous.event;
+
+import org.briarproject.bramble.api.contact.PendingContactId;
+import org.briarproject.bramble.api.event.Event;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import javax.annotation.concurrent.Immutable;
+
+/**
+ * An event that is broadcast when a rendezvous connection is closed.
+ */
+@Immutable
+@NotNullByDefault
+public class RendezvousConnectionClosedEvent extends Event {
+
+	private final PendingContactId pendingContactId;
+	private final boolean success;
+
+	public RendezvousConnectionClosedEvent(PendingContactId pendingContactId,
+			boolean success) {
+		this.pendingContactId = pendingContactId;
+		this.success = success;
+	}
+
+	public PendingContactId getPendingContactId() {
+		return pendingContactId;
+	}
+
+	public boolean isSuccess() {
+		return success;
+	}
+}

bramble-api/src/main/java/org/briarproject/bramble/api/rendezvous/event/RendezvousConnectionOpenedEvent.java

+package org.briarproject.bramble.api.rendezvous.event;
+
+import org.briarproject.bramble.api.contact.PendingContactId;
+import org.briarproject.bramble.api.event.Event;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import javax.annotation.concurrent.Immutable;
+
+/**
+ * An event that is broadcast when a rendezvous connection is opened.
+ */
+@Immutable
+@NotNullByDefault
+public class RendezvousConnectionOpenedEvent extends Event {
+
+	private final PendingContactId pendingContactId;
+
+	public RendezvousConnectionOpenedEvent(PendingContactId pendingContactId) {
+		this.pendingContactId = pendingContactId;
+	}
+
+	public PendingContactId getPendingContactId() {
+		return pendingContactId;
+	}
+}

bramble-core/src/main/java/org/briarproject/bramble/plugin/ConnectionRegistryImpl.java

@@ -2,6 +2,7 @@ package org.briarproject.bramble.plugin;
 
 import org.briarproject.bramble.api.Multiset;
 import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.contact.PendingContactId;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.ConnectionRegistry;
@@ -10,41 +11,49 @@ import org.briarproject.bramble.api.plugin.event.ConnectionClosedEvent;
 import org.briarproject.bramble.api.plugin.event.ConnectionOpenedEvent;
 import org.briarproject.bramble.api.plugin.event.ContactConnectedEvent;
 import org.briarproject.bramble.api.plugin.event.ContactDisconnectedEvent;
+import org.briarproject.bramble.api.rendezvous.event.RendezvousConnectionClosedEvent;
+import org.briarproject.bramble.api.rendezvous.event.RendezvousConnectionOpenedEvent;
 
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
-import java.util.concurrent.locks.Lock;
-import java.util.concurrent.locks.ReentrantLock;
+import java.util.Set;
 import java.util.logging.Logger;
 
+import javax.annotation.concurrent.GuardedBy;
 import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.INFO;
+import static java.util.logging.Logger.getLogger;
 
 @ThreadSafe
 @NotNullByDefault
 class ConnectionRegistryImpl implements ConnectionRegistry {
 
 	private static final Logger LOG =
-			Logger.getLogger(ConnectionRegistryImpl.class.getName());
+			getLogger(ConnectionRegistryImpl.class.getName());
 
 	private final EventBus eventBus;
-	private final Lock lock = new ReentrantLock();
 
-	// The following are locking: lock
-	private final Map<TransportId, Multiset<ContactId>> connections;
+	private final Object lock = new Object();
+	@GuardedBy("lock")
+	private final Map<TransportId, Multiset<ContactId>> contactConnections;
+	@GuardedBy("lock")
 	private final Multiset<ContactId> contactCounts;
+	@GuardedBy("lock")
+	private final Set<PendingContactId> connectedPendingContacts;
 
 	@Inject
 	ConnectionRegistryImpl(EventBus eventBus) {
 		this.eventBus = eventBus;
-		connections = new HashMap<>();
+		contactConnections = new HashMap<>();
 		contactCounts = new Multiset<>();
+		connectedPendingContacts = new HashSet<>();
 	}
 
 	@Override
@@ -55,17 +64,14 @@ class ConnectionRegistryImpl implements ConnectionRegistry {
 			else LOG.info("Outgoing connection registered: " + t);
 		}
 		boolean firstConnection = false;
-		lock.lock();
-		try {
-			Multiset<ContactId> m = connections.get(t);
+		synchronized (lock) {
+			Multiset<ContactId> m = contactConnections.get(t);
 			if (m == null) {
 				m = new Multiset<>();
-				connections.put(t, m);
+				contactConnections.put(t, m);
 			}
 			m.add(c);
 			if (contactCounts.add(c) == 1) firstConnection = true;
-		} finally {
-			lock.unlock();
 		}
 		eventBus.broadcast(new ConnectionOpenedEvent(c, t, incoming));
 		if (firstConnection) {
@@ -82,14 +88,12 @@ class ConnectionRegistryImpl implements ConnectionRegistry {
 			else LOG.info("Outgoing connection unregistered: " + t);
 		}
 		boolean lastConnection = false;
-		lock.lock();
-		try {
-			Multiset<ContactId> m = connections.get(t);
-			if (m == null) throw new IllegalArgumentException();
+		synchronized (lock) {
+			Multiset<ContactId> m = contactConnections.get(t);
+			if (m == null || !m.contains(c))
+				throw new IllegalArgumentException();
 			m.remove(c);
 			if (contactCounts.remove(c) == 0) lastConnection = true;
-		} finally {
-			lock.unlock();
 		}
 		eventBus.broadcast(new ConnectionClosedEvent(c, t, incoming));
 		if (lastConnection) {
@@ -100,37 +104,47 @@ class ConnectionRegistryImpl implements ConnectionRegistry {
 
 	@Override
 	public Collection<ContactId> getConnectedContacts(TransportId t) {
-		lock.lock();
-		try {
-			Multiset<ContactId> m = connections.get(t);
+		synchronized (lock) {
+			Multiset<ContactId> m = contactConnections.get(t);
 			if (m == null) return Collections.emptyList();
 			List<ContactId> ids = new ArrayList<>(m.keySet());
 			if (LOG.isLoggable(INFO))
 				LOG.info(ids.size() + " contacts connected: " + t);
 			return ids;
-		} finally {
-			lock.unlock();
 		}
 	}
 
 	@Override
 	public boolean isConnected(ContactId c, TransportId t) {
-		lock.lock();
-		try {
-			Multiset<ContactId> m = connections.get(t);
+		synchronized (lock) {
+			Multiset<ContactId> m = contactConnections.get(t);
 			return m != null && m.contains(c);
-		} finally {
-			lock.unlock();
 		}
 	}
 
 	@Override
 	public boolean isConnected(ContactId c) {
-		lock.lock();
-		try {
+		synchronized (lock) {
 			return contactCounts.contains(c);
-		} finally {
-			lock.unlock();
 		}
 	}
+
+	@Override
+	public boolean registerConnection(PendingContactId p) {
+		boolean added;
+		synchronized (lock) {
+			added = connectedPendingContacts.add(p);
+		}
+		if (added) eventBus.broadcast(new RendezvousConnectionOpenedEvent(p));
+		return added;
+	}
+
+	@Override
+	public void unregisterConnection(PendingContactId p, boolean success) {
+		synchronized (lock) {
+			if (!connectedPendingContacts.remove(p))
+				throw new IllegalArgumentException();
+		}
+		eventBus.broadcast(new RendezvousConnectionClosedEvent(p, success));
+	}
 }

bramble-core/src/test/java/org/briarproject/bramble/plugin/ConnectionRegistryImplTest.java

 package org.briarproject.bramble.plugin;
 
 import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.contact.PendingContactId;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.plugin.ConnectionRegistry;
 import org.briarproject.bramble.api.plugin.TransportId;
@@ -8,93 +9,106 @@ import org.briarproject.bramble.api.plugin.event.ConnectionClosedEvent;
 import org.briarproject.bramble.api.plugin.event.ConnectionOpenedEvent;
 import org.briarproject.bramble.api.plugin.event.ContactConnectedEvent;
 import org.briarproject.bramble.api.plugin.event.ContactDisconnectedEvent;
-import org.briarproject.bramble.test.BrambleTestCase;
+import org.briarproject.bramble.api.rendezvous.event.RendezvousConnectionClosedEvent;
+import org.briarproject.bramble.api.rendezvous.event.RendezvousConnectionOpenedEvent;
+import org.briarproject.bramble.test.BrambleMockTestCase;
 import org.jmock.Expectations;
-import org.jmock.Mockery;
 import org.junit.Test;
 
 import java.util.Collection;
-import java.util.Collections;
-import java.util.NoSuchElementException;
 
+import static java.util.Collections.emptyList;
+import static java.util.Collections.singletonList;
 import static org.briarproject.bramble.test.TestUtils.getContactId;
+import static org.briarproject.bramble.test.TestUtils.getRandomId;
 import static org.briarproject.bramble.test.TestUtils.getTransportId;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
-public class ConnectionRegistryImplTest extends BrambleTestCase {
+public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 
-	private final ContactId contactId, contactId1;
-	private final TransportId transportId, transportId1;
+	private final EventBus eventBus = context.mock(EventBus.class);
 
-	public ConnectionRegistryImplTest() {
-		contactId = getContactId();
-		contactId1 = getContactId();
-		transportId = getTransportId();
-		transportId1 = getTransportId();
-	}
+	private final ContactId contactId = getContactId();
+	private final ContactId contactId1 = getContactId();
+	private final TransportId transportId = getTransportId();
+	private final TransportId transportId1 = getTransportId();
+	private final PendingContactId pendingContactId =
+			new PendingContactId(getRandomId());
 
 	@Test
 	public void testRegisterAndUnregister() {
-		Mockery context = new Mockery();
-		EventBus eventBus = context.mock(EventBus.class);
-		context.checking(new Expectations() {{
-			exactly(5).of(eventBus).broadcast(with(any(
-					ConnectionOpenedEvent.class)));
-			exactly(2).of(eventBus).broadcast(with(any(
-					ConnectionClosedEvent.class)));
-			exactly(3).of(eventBus).broadcast(with(any(
-					ContactConnectedEvent.class)));
-			oneOf(eventBus).broadcast(with(any(
-					ContactDisconnectedEvent.class)));
-		}});
-
 		ConnectionRegistry c = new ConnectionRegistryImpl(eventBus);
 
 		// The registry should be empty
-		assertEquals(Collections.emptyList(),
-				c.getConnectedContacts(transportId));
-		assertEquals(Collections.emptyList(),
-				c.getConnectedContacts(transportId1));
+		assertEquals(emptyList(), c.getConnectedContacts(transportId));
+		assertEquals(emptyList(), c.getConnectedContacts(transportId1));
+
 		// Check that a registered connection shows up - this should
 		// broadcast a ConnectionOpenedEvent and a ContactConnectedEvent
+		context.checking(new Expectations() {{
+			oneOf(eventBus).broadcast(with(any(ConnectionOpenedEvent.class)));
+			oneOf(eventBus).broadcast(with(any(ContactConnectedEvent.class)));
+		}});
 		c.registerConnection(contactId, transportId, true);
-		assertEquals(Collections.singletonList(contactId),
+		assertEquals(singletonList(contactId),
 				c.getConnectedContacts(transportId));
-		assertEquals(Collections.emptyList(),
-				c.getConnectedContacts(transportId1));
+		assertEquals(emptyList(), c.getConnectedContacts(transportId1));
+		context.assertIsSatisfied();
+
 		// Register an identical connection - this should broadcast a
 		// ConnectionOpenedEvent and lookup should be unaffected
+		context.checking(new Expectations() {{
+			oneOf(eventBus).broadcast(with(any(ConnectionOpenedEvent.class)));
+		}});
 		c.registerConnection(contactId, transportId, true);
-		assertEquals(Collections.singletonList(contactId),
+		assertEquals(singletonList(contactId),
 				c.getConnectedContacts(transportId));
-		assertEquals(Collections.emptyList(),
-				c.getConnectedContacts(transportId1));
+		assertEquals(emptyList(), c.getConnectedContacts(transportId1));
+		context.assertIsSatisfied();
+
 		// Unregister one of the connections - this should broadcast a
 		// ConnectionClosedEvent and lookup should be unaffected
+		context.checking(new Expectations() {{
+			oneOf(eventBus).broadcast(with(any(ConnectionClosedEvent.class)));
+		}});
 		c.unregisterConnection(contactId, transportId, true);
-		assertEquals(Collections.singletonList(contactId),
+		assertEquals(singletonList(contactId),
 				c.getConnectedContacts(transportId));
-		assertEquals(Collections.emptyList(),
-				c.getConnectedContacts(transportId1));
+		assertEquals(emptyList(), c.getConnectedContacts(transportId1));
+		context.assertIsSatisfied();
+
 		// Unregister the other connection - this should broadcast a
 		// ConnectionClosedEvent and a ContactDisconnectedEvent
+		context.checking(new Expectations() {{
+			oneOf(eventBus).broadcast(with(any(ConnectionClosedEvent.class)));
+			oneOf(eventBus).broadcast(with(any(
+					ContactDisconnectedEvent.class)));
+		}});
 		c.unregisterConnection(contactId, transportId, true);
-		assertEquals(Collections.emptyList(),
-				c.getConnectedContacts(transportId));
-		assertEquals(Collections.emptyList(),
-				c.getConnectedContacts(transportId1));
+		assertEquals(emptyList(), c.getConnectedContacts(transportId));
+		assertEquals(emptyList(), c.getConnectedContacts(transportId1));
+		context.assertIsSatisfied();
+
 		// Try to unregister the connection again - exception should be thrown
 		try {
 			c.unregisterConnection(contactId, transportId, true);
 			fail();
-		} catch (NoSuchElementException expected) {
+		} catch (IllegalArgumentException expected) {
 			// Expected
 		}
+
 		// Register both contacts with one transport, one contact with both -
 		// this should broadcast three ConnectionOpenedEvents and two
 		// ContactConnectedEvents
+		context.checking(new Expectations() {{
+			exactly(3).of(eventBus).broadcast(with(any(
+					ConnectionOpenedEvent.class)));
+			exactly(2).of(eventBus).broadcast(with(any(
+					ContactConnectedEvent.class)));
+		}});
 		c.registerConnection(contactId, transportId, true);
 		c.registerConnection(contactId1, transportId, true);
 		c.registerConnection(contactId1, transportId1, true);
@@ -102,8 +116,34 @@ public class ConnectionRegistryImplTest extends BrambleTestCase {
 		assertEquals(2, connected.size());
 		assertTrue(connected.contains(contactId));
 		assertTrue(connected.contains(contactId1));
-		assertEquals(Collections.singletonList(contactId1),
+		assertEquals(singletonList(contactId1),
 				c.getConnectedContacts(transportId1));
+	}
+
+	@Test
+	public void testRegisterAndUnregisterPendingContacts() {
+		ConnectionRegistry c = new ConnectionRegistryImpl(eventBus);
+
+		context.checking(new Expectations() {{
+			oneOf(eventBus).broadcast(with(any(
+					RendezvousConnectionOpenedEvent.class)));
+		}});
+		assertTrue(c.registerConnection(pendingContactId));
+		assertFalse(c.registerConnection(pendingContactId)); // Redundant
 		context.assertIsSatisfied();
+
+		context.checking(new Expectations() {{
+			oneOf(eventBus).broadcast(with(any(
+					RendezvousConnectionClosedEvent.class)));
+		}});
+		c.unregisterConnection(pendingContactId, true);
+		context.assertIsSatisfied();
+
+		try {
+			c.unregisterConnection(pendingContactId, true);
+			fail();
+		} catch (IllegalArgumentException expected) {
+			// Expected
+		}
 	}
 }