H2DatabaseTest.java

		// The message should be unread by default
		assertFalse(db.getReadFlag(txn, messageId));
		// Mark the message read
		db.setReadFlag(txn, messageId, true);
		// The message should be read
		assertTrue(db.getReadFlag(txn, messageId));
		// Mark the message unread
		db.setReadFlag(txn, messageId, false);
		// The message should be unread
		assertFalse(db.getReadFlag(txn, messageId));

		db.commitTransaction(txn);
		db.close();
	}

	@Test
	public void testGetUnreadMessageCounts() throws Exception {
		Database<Connection> db = open(false);
		Connection txn = db.startTransaction();

		// Subscribe to a couple of groups
		db.addGroup(txn, group);
		GroupId groupId1 = new GroupId(TestUtils.getRandomId());
		Group group1 = new Group(groupId1, "Another group",
				new byte[GROUP_SALT_LENGTH]);
		db.addGroup(txn, group1);

		// Store two messages in the first group
		db.addMessage(txn, message, false);
		MessageId messageId1 = new MessageId(TestUtils.getRandomId());
		Message message1 = new TestMessage(messageId1, null, group, author,
				contentType, subject, timestamp, raw);
		db.addMessage(txn, message1, false);

		// Store one message in the second group
		MessageId messageId2 = new MessageId(TestUtils.getRandomId());
		Message message2 = new TestMessage(messageId2, null, group1, author,
				contentType, subject, timestamp, raw);
		db.addMessage(txn, message2, false);

		// Mark one of the messages in the first group read
		db.setReadFlag(txn, messageId, true);

		// There should be one unread message in each group
		Map<GroupId, Integer> counts = db.getUnreadMessageCounts(txn);
		assertEquals(2, counts.size());
		Integer count = counts.get(groupId);
		assertNotNull(count);
		assertEquals(1, count.intValue());
		count = counts.get(groupId1);
		assertNotNull(count);
		assertEquals(1, count.intValue());

		// Mark the read message unread
		db.setReadFlag(txn, messageId, false);

		// Mark the message in the second group read
		db.setReadFlag(txn, messageId2, true);

		// There should be two unread messages in the first group, none in
		// the second group
		counts = db.getUnreadMessageCounts(txn);
		assertEquals(1, counts.size());
		count = counts.get(groupId);
		assertNotNull(count);
		assertEquals(2, count.intValue());

		db.commitTransaction(txn);
		db.close();
	}

	@Test
	public void testMultipleSubscriptionsAndUnsubscriptions() throws Exception {
		// Create some groups
		List<Group> groups = new ArrayList<Group>();
		for(int i = 0; i < 100; i++) {
			GroupId id = new GroupId(TestUtils.getRandomId());
			String name = "Group " + i;
			groups.add(new Group(id, name, new byte[GROUP_SALT_LENGTH]));
		}

		Database<Connection> db = open(false);
		Connection txn = db.startTransaction();

		// Add a contact and subscribe to the groups
		db.addLocalAuthor(txn, localAuthor);
		assertEquals(contactId, db.addContact(txn, author, localAuthorId));
		for(Group g : groups) db.addGroup(txn, g);

		// Make the groups visible to the contact
		Collections.shuffle(groups);
		for(Group g : groups) db.addVisibility(txn, contactId, g.getId());

		// Make some of the groups invisible to the contact and remove them all
		Collections.shuffle(groups);
		for(Group g : groups) {
			if(Math.random() < 0.5)
				db.removeVisibility(txn, contactId, g.getId());
			db.removeGroup(txn, g.getId());
		}

		db.commitTransaction(txn);
		db.close();
	}

	@Test
	public void testTemporarySecrets() throws Exception {
		// Create an endpoint and four consecutive temporary secrets
		long epoch = 123, latency = 234;
		boolean alice = false;
		long outgoing1 = 345, centre1 = 456;
		long outgoing2 = 567, centre2 = 678;
		long outgoing3 = 789, centre3 = 890;
		long outgoing4 = 901, centre4 = 123;
		Endpoint ep = new Endpoint(contactId, transportId, epoch, alice);
		Random random = new Random();
		byte[] secret1 = new byte[32], bitmap1 = new byte[4];
		random.nextBytes(secret1);
		random.nextBytes(bitmap1);
		TemporarySecret s1 = new TemporarySecret(contactId, transportId, epoch,
				alice, 0, secret1, outgoing1, centre1, bitmap1);
		byte[] secret2 = new byte[32], bitmap2 = new byte[4];
		random.nextBytes(secret2);
		random.nextBytes(bitmap2);
		TemporarySecret s2 = new TemporarySecret(contactId, transportId, epoch,
				alice, 1, secret2, outgoing2, centre2, bitmap2);
		byte[] secret3 = new byte[32], bitmap3 = new byte[4];
		random.nextBytes(secret3);
		random.nextBytes(bitmap3);
		TemporarySecret s3 = new TemporarySecret(contactId, transportId, epoch,
				alice, 2, secret3, outgoing3, centre3, bitmap3);
		byte[] secret4 = new byte[32], bitmap4 = new byte[4];
		random.nextBytes(secret4);
		random.nextBytes(bitmap4);
		TemporarySecret s4 = new TemporarySecret(contactId, transportId, epoch,
				alice, 3, secret4, outgoing4, centre4, bitmap4);

		Database<Connection> db = open(false);
		Connection txn = db.startTransaction();

		// Initially there should be no secrets in the database
		assertEquals(Collections.emptyList(), db.getSecrets(txn));

		// Add the contact, the transport, the endpoint and the first three
		// secrets (periods 0, 1 and 2)
		db.addLocalAuthor(txn, localAuthor);
		assertEquals(contactId, db.addContact(txn, author, localAuthorId));
		db.addTransport(txn, transportId, latency);
		db.addEndpoint(txn, ep);
		db.addSecrets(txn, Arrays.asList(s1, s2, s3));

		// Retrieve the first three secrets
		Collection<TemporarySecret> secrets = db.getSecrets(txn);
		assertEquals(3, secrets.size());
		boolean foundFirst = false, foundSecond = false, foundThird = false;
		for(TemporarySecret s : secrets) {
			assertEquals(contactId, s.getContactId());
			assertEquals(transportId, s.getTransportId());
			assertEquals(epoch, s.getEpoch());
			assertEquals(alice, s.getAlice());
			if(s.getPeriod() == 0) {
				assertArrayEquals(secret1, s.getSecret());
				assertEquals(outgoing1, s.getOutgoingConnectionCounter());
				assertEquals(centre1, s.getWindowCentre());
				assertArrayEquals(bitmap1, s.getWindowBitmap());
				foundFirst = true;
			} else if(s.getPeriod() == 1) {
				assertArrayEquals(secret2, s.getSecret());
				assertEquals(outgoing2, s.getOutgoingConnectionCounter());
				assertEquals(centre2, s.getWindowCentre());
				assertArrayEquals(bitmap2, s.getWindowBitmap());
				foundSecond = true;
			} else if(s.getPeriod() == 2) {
				assertArrayEquals(secret3, s.getSecret());
				assertEquals(outgoing3, s.getOutgoingConnectionCounter());
				assertEquals(centre3, s.getWindowCentre());
				assertArrayEquals(bitmap3, s.getWindowBitmap());
				foundThird = true;
			} else {
				fail();
			}
		}
		assertTrue(foundFirst);
		assertTrue(foundSecond);
		assertTrue(foundThird);

		// Adding the fourth secret (period 3) should delete the first
		db.addSecrets(txn, Arrays.asList(s4));
		secrets = db.getSecrets(txn);
		assertEquals(3, secrets.size());
		foundSecond = foundThird = false;
		boolean foundFourth = false;
		for(TemporarySecret s : secrets) {
			assertEquals(contactId, s.getContactId());
			assertEquals(transportId, s.getTransportId());
			assertEquals(epoch, s.getEpoch());
			assertEquals(alice, s.getAlice());
			if(s.getPeriod() == 1) {
				assertArrayEquals(secret2, s.getSecret());
				assertEquals(outgoing2, s.getOutgoingConnectionCounter());
				assertEquals(centre2, s.getWindowCentre());
				assertArrayEquals(bitmap2, s.getWindowBitmap());
				foundSecond = true;
			} else if(s.getPeriod() == 2) {
				assertArrayEquals(secret3, s.getSecret());
				assertEquals(outgoing3, s.getOutgoingConnectionCounter());
				assertEquals(centre3, s.getWindowCentre());
				assertArrayEquals(bitmap3, s.getWindowBitmap());
				foundThird = true;
			} else if(s.getPeriod() == 3) {
				assertArrayEquals(secret4, s.getSecret());
				assertEquals(outgoing4, s.getOutgoingConnectionCounter());
				assertEquals(centre4, s.getWindowCentre());
				assertArrayEquals(bitmap4, s.getWindowBitmap());
				foundFourth = true;
			} else {
				fail();
			}
		}
		assertTrue(foundSecond);
		assertTrue(foundThird);
		assertTrue(foundFourth);

		// Removing the contact should remove the secrets
		db.removeContact(txn, contactId);
		assertEquals(Collections.emptyList(), db.getSecrets(txn));

		db.commitTransaction(txn);
		db.close();
	}

	@Test
	public void testIncrementConnectionCounter() throws Exception {
		// Create an endpoint and a temporary secret
		long epoch = 123, latency = 234;
		boolean alice = false;
		long period = 345, outgoing = 456, centre = 567;
		Endpoint ep = new Endpoint(contactId, transportId, epoch, alice);
		Random random = new Random();
		byte[] secret = new byte[32], bitmap = new byte[4];
		random.nextBytes(secret);
		TemporarySecret s = new TemporarySecret(contactId, transportId, epoch,
				alice, period, secret, outgoing, centre, bitmap);

		Database<Connection> db = open(false);
		Connection txn = db.startTransaction();

		// Add the contact, the transport, the endpoint and the temporary secret
		db.addLocalAuthor(txn, localAuthor);
		assertEquals(contactId, db.addContact(txn, author, localAuthorId));
		db.addTransport(txn, transportId, latency);
		db.addEndpoint(txn, ep);
		db.addSecrets(txn, Arrays.asList(s));

		// Retrieve the secret
		Collection<TemporarySecret> secrets = db.getSecrets(txn);
		assertEquals(1, secrets.size());
		s = secrets.iterator().next();
		assertEquals(contactId, s.getContactId());
		assertEquals(transportId, s.getTransportId());
		assertEquals(period, s.getPeriod());
		assertArrayEquals(secret, s.getSecret());
		assertEquals(outgoing, s.getOutgoingConnectionCounter());
		assertEquals(centre, s.getWindowCentre());
		assertArrayEquals(bitmap, s.getWindowBitmap());

		// Increment the connection counter twice and retrieve the secret again
		assertEquals(outgoing, db.incrementConnectionCounter(txn,
				s.getContactId(), s.getTransportId(), s.getPeriod()));
		assertEquals(outgoing + 1, db.incrementConnectionCounter(txn,
				s.getContactId(), s.getTransportId(), s.getPeriod()));
		secrets = db.getSecrets(txn);
		assertEquals(1, secrets.size());
		s = secrets.iterator().next();
		assertEquals(contactId, s.getContactId());
		assertEquals(transportId, s.getTransportId());
		assertEquals(period, s.getPeriod());
		assertArrayEquals(secret, s.getSecret());
		assertEquals(outgoing + 2, s.getOutgoingConnectionCounter());
		assertEquals(centre, s.getWindowCentre());
		assertArrayEquals(bitmap, s.getWindowBitmap());

		db.commitTransaction(txn);
		db.close();
	}

	@Test
	public void testSetConnectionWindow() throws Exception {
		// Create an endpoint and a temporary secret
		long epoch = 123, latency = 234;
		boolean alice = false;
		long period = 345, outgoing = 456, centre = 567;
		Endpoint ep = new Endpoint(contactId, transportId, epoch, alice);
		Random random = new Random();
		byte[] secret = new byte[32], bitmap = new byte[4];
		random.nextBytes(secret);
		TemporarySecret s = new TemporarySecret(contactId, transportId, epoch,
				alice, period, secret, outgoing, centre, bitmap);

		Database<Connection> db = open(false);
		Connection txn = db.startTransaction();

		// Add the contact, the transport, the endpoint and the temporary secret
		db.addLocalAuthor(txn, localAuthor);
		assertEquals(contactId, db.addContact(txn, author, localAuthorId));
		db.addTransport(txn, transportId, latency);
		db.addEndpoint(txn, ep);
		db.addSecrets(txn, Arrays.asList(s));

		// Retrieve the secret
		Collection<TemporarySecret> secrets = db.getSecrets(txn);
		assertEquals(1, secrets.size());
		s = secrets.iterator().next();
		assertEquals(contactId, s.getContactId());
		assertEquals(transportId, s.getTransportId());
		assertEquals(period, s.getPeriod());
		assertArrayEquals(secret, s.getSecret());
		assertEquals(outgoing, s.getOutgoingConnectionCounter());
		assertEquals(centre, s.getWindowCentre());
		assertArrayEquals(bitmap, s.getWindowBitmap());

		// Update the connection window and retrieve the secret again
		random.nextBytes(bitmap);
		db.setConnectionWindow(txn, contactId, transportId, period, centre,
				bitmap);
		secrets = db.getSecrets(txn);
		assertEquals(1, secrets.size());
		s = secrets.iterator().next();
		assertEquals(contactId, s.getContactId());
		assertEquals(transportId, s.getTransportId());
		assertEquals(period, s.getPeriod());
		assertArrayEquals(secret, s.getSecret());
		assertEquals(outgoing, s.getOutgoingConnectionCounter());
		assertEquals(centre, s.getWindowCentre());
		assertArrayEquals(bitmap, s.getWindowBitmap());

		// Updating a nonexistent window should not throw an exception
		db.setConnectionWindow(txn, contactId, transportId, period + 1, 1,
				bitmap);
		// The nonexistent window should not have been created
		secrets = db.getSecrets(txn);
		assertEquals(1, secrets.size());
		s = secrets.iterator().next();
		assertEquals(contactId, s.getContactId());
		assertEquals(transportId, s.getTransportId());
		assertEquals(period, s.getPeriod());
		assertArrayEquals(secret, s.getSecret());
		assertEquals(outgoing, s.getOutgoingConnectionCounter());
		assertEquals(centre, s.getWindowCentre());
		assertArrayEquals(bitmap, s.getWindowBitmap());

		db.commitTransaction(txn);
		db.close();
	}

	@Test
	public void testContactTransports() throws Exception {
		// Create some endpoints
		long epoch1 = 123, latency1 = 234;
		long epoch2 = 345, latency2 = 456;
		boolean alice1 = true, alice2 = false;
		TransportId transportId1 = new TransportId("bar");
		TransportId transportId2 = new TransportId("baz");
		Endpoint ep1 = new Endpoint(contactId, transportId1, epoch1, alice1);
		Endpoint ep2 = new Endpoint(contactId, transportId2, epoch2, alice2);

		Database<Connection> db = open(false);
		Connection txn = db.startTransaction();

		// Initially there should be no endpoints in the database
		assertEquals(Collections.emptyList(), db.getEndpoints(txn));

		// Add the contact, the transports and the endpoints
		db.addLocalAuthor(txn, localAuthor);
		assertEquals(contactId, db.addContact(txn, author, localAuthorId));
		db.addTransport(txn, transportId1, latency1);
		db.addTransport(txn, transportId2, latency2);
		db.addEndpoint(txn, ep1);
		db.addEndpoint(txn, ep2);

		// Retrieve the contact transports
		Collection<Endpoint> endpoints = db.getEndpoints(txn);
		assertEquals(2, endpoints.size());
		boolean foundFirst = false, foundSecond = false;
		for(Endpoint ep : endpoints) {
			assertEquals(contactId, ep.getContactId());
			if(ep.getTransportId().equals(transportId1)) {
				assertEquals(epoch1, ep.getEpoch());
				assertEquals(alice1, ep.getAlice());
				foundFirst = true;
			} else if(ep.getTransportId().equals(transportId2)) {
				assertEquals(epoch2, ep.getEpoch());
				assertEquals(alice2, ep.getAlice());
				foundSecond = true;
			} else {
				fail();
			}
		}
		assertTrue(foundFirst);
		assertTrue(foundSecond);

		// Removing the contact should remove the contact transports
		db.removeContact(txn, contactId);
		assertEquals(Collections.emptyList(), db.getEndpoints(txn));

		db.commitTransaction(txn);
		db.close();
	}

	@Test
	public void testGetAvailableGroups() throws Exception {
		ContactId contactId1 = new ContactId(2);
		AuthorId authorId1 = new AuthorId(TestUtils.getRandomId());
		Author author1 = new Author(authorId1, "Carol",
				new byte[MAX_PUBLIC_KEY_LENGTH]);

		Database<Connection> db = open(false);
		Connection txn = db.startTransaction();

		// Add two contacts who subscribe to a group
		db.addLocalAuthor(txn, localAuthor);
		assertEquals(contactId, db.addContact(txn, author, localAuthorId));
		assertEquals(contactId1, db.addContact(txn, author1, localAuthorId));
		db.setGroups(txn, contactId, Arrays.asList(group), 1);
		db.setGroups(txn, contactId1, Arrays.asList(group), 1);

		// The group should be available, not subscribed, not visible to all
		assertEquals(Collections.emptyList(), db.getGroups(txn));
		Iterator<GroupStatus> it = db.getAvailableGroups(txn).iterator();
		assertTrue(it.hasNext());
		GroupStatus status = it.next();
		assertEquals(group, status.getGroup());
		assertFalse(status.isSubscribed());
		assertFalse(status.isVisibleToAll());
		assertFalse(it.hasNext());

		// Subscribe to the group - it should be available, subscribed,
		// not visible to all
		db.addGroup(txn, group);
		assertEquals(Arrays.asList(group), db.getGroups(txn));
		it = db.getAvailableGroups(txn).iterator();
		assertTrue(it.hasNext());
		status = it.next();
		assertEquals(group, status.getGroup());
		assertTrue(status.isSubscribed());
		assertFalse(status.isVisibleToAll());
		assertFalse(it.hasNext());

		// The first contact unsubscribes - the group should be available,
		// subscribed, not visible to all
		db.setGroups(txn, contactId, Collections.<Group>emptyList(), 2);
		assertEquals(Arrays.asList(group), db.getGroups(txn));
		it = db.getAvailableGroups(txn).iterator();
		assertTrue(it.hasNext());
		status = it.next();
		assertEquals(group, status.getGroup());
		assertTrue(status.isSubscribed());
		assertFalse(status.isVisibleToAll());
		assertFalse(it.hasNext());

		// Make the group visible to all contacts - it should be available,
		// subscribed, visible to all
		db.setVisibleToAll(txn, groupId, true);
		assertEquals(Arrays.asList(group), db.getGroups(txn));
		it = db.getAvailableGroups(txn).iterator();
		assertTrue(it.hasNext());
		status = it.next();
		assertEquals(group, status.getGroup());
		assertTrue(status.isSubscribed());
		assertTrue(status.isVisibleToAll());
		assertFalse(it.hasNext());

		// Unsubscribe from the group - it should be available, not subscribed,
		// not visible to all
		db.removeGroup(txn, groupId);
		assertEquals(Collections.emptyList(), db.getGroups(txn));
		it = db.getAvailableGroups(txn).iterator();
		assertTrue(it.hasNext());
		status = it.next();
		assertEquals(group, status.getGroup());
		assertFalse(status.isSubscribed());
		assertFalse(status.isVisibleToAll());
		assertFalse(it.hasNext());

		// The second contact unsubscribes - the group should no longer be
		// available
		db.setGroups(txn, contactId1, Collections.<Group>emptyList(), 2);
		assertEquals(Collections.emptyList(), db.getGroups(txn));
		assertEquals(Collections.emptyList(), db.getAvailableGroups(txn));

		db.commitTransaction(txn);
		db.close();
	}

	@Test
	public void testGetContactsByLocalAuthorId() throws Exception {
		Database<Connection> db = open(false);
		Connection txn = db.startTransaction();

		// Add a local author - no contacts should be associated
		db.addLocalAuthor(txn, localAuthor);
		Collection<ContactId> contacts = db.getContacts(txn, localAuthorId);
		assertEquals(Collections.emptyList(), contacts);

		// Add a contact associated with the local author
		assertEquals(contactId, db.addContact(txn, author, localAuthorId));
		contacts = db.getContacts(txn, localAuthorId);
		assertEquals(Collections.singletonList(contactId), contacts);

		// Remove the local author - the contact should be removed
		db.removeLocalAuthor(txn, localAuthorId);
		contacts = db.getContacts(txn, localAuthorId);
		assertEquals(Collections.emptyList(), contacts);
		assertFalse(db.containsContact(txn, contactId));

		db.commitTransaction(txn);
		db.close();
	}

	@Test
	public void testGetInboxMessageHeaders() throws Exception {
		Database<Connection> db = open(false);
		Connection txn = db.startTransaction();

		// Add a contact and an inbox group - no headers should be returned
		db.addLocalAuthor(txn, localAuthor);
		assertEquals(contactId, db.addContact(txn, author, localAuthorId));
		db.addGroup(txn, group);
		db.setInboxGroup(txn, contactId, group);
		assertEquals(Collections.emptyList(),
				db.getInboxMessageHeaders(txn, contactId));

		// Add a message to the inbox group - the header should be returned
		db.addMessage(txn, message, false);
		Collection<MessageHeader> headers =
				db.getInboxMessageHeaders(txn, contactId);
		assertEquals(1, headers.size());
		MessageHeader header = headers.iterator().next();
		assertEquals(messageId, header.getId());
		assertNull(header.getParent());
		assertEquals(groupId, header.getGroupId());
		assertEquals(localAuthor, header.getAuthor());
		assertEquals(contentType, header.getContentType());
		assertEquals(timestamp, header.getTimestamp());
		assertFalse(header.isRead());

		db.commitTransaction(txn);
		db.close();
	}

	@Test
	public void testOfferedMessages() throws Exception {
		Database<Connection> db = open(false);
		Connection txn = db.startTransaction();

		// Add a contact - initially there should be no offered messages
		db.addLocalAuthor(txn, localAuthor);
		assertEquals(contactId, db.addContact(txn, author, localAuthorId));
		assertEquals(0, db.countOfferedMessages(txn, contactId));

		// Add some offered messages and count them
		List<MessageId> ids = new ArrayList<MessageId>();
		for(int i = 0; i < 10; i++) {
			MessageId m = new MessageId(TestUtils.getRandomId());
			db.addOfferedMessage(txn, contactId, m);
			ids.add(m);
		}
		assertEquals(10, db.countOfferedMessages(txn, contactId));

		// Remove some of the offered messages and count again
		List<MessageId> half = ids.subList(0, 5);
		db.removeOfferedMessages(txn, contactId, half);
		assertTrue(db.removeOfferedMessage(txn, contactId, ids.get(5)));
		assertEquals(4, db.countOfferedMessages(txn, contactId));

		db.commitTransaction(txn);
		db.close();
	}

	@Test
	public void testExceptionHandling() throws Exception {
		Database<Connection> db = open(false);
		Connection txn = db.startTransaction();
		try {
			// Ask for a nonexistent message - an exception should be thrown
			db.getRawMessage(txn, messageId);
			fail();
		} catch(DbException expected) {
			// It should be possible to abort the transaction without error
			db.abortTransaction(txn);
		}
		// It should be possible to close the database cleanly
		db.close();
	}

	private Database<Connection> open(boolean resume) throws Exception {
		Database<Connection> db = new H2Database(new TestDatabaseConfig(testDir,
				MAX_SIZE), new TestFileUtils(), new SystemClock());
		if(!resume) TestUtils.deleteTestDirectory(testDir);
		db.open();
		return db;
	}

	@After
	public void tearDown() {
		TestUtils.deleteTestDirectory(testDir);
	}
}