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/*
* Copyright (c) 2010 Remko Tron¨on
* Licensed under the GNU General Public License v3.
* See Documentation/Licenses/GPLv3.txt for more information.
*/
/*
* Copyright (c) 2010, Isode Limited, London, England.
* All rights reserved.
*/
package com.isode.stroke.network;
import com.isode.stroke.network.DomainNameServiceQuery.Result;
import com.isode.stroke.signals.Signal1;
import com.isode.stroke.signals.SignalConnection;
import com.isode.stroke.signals.Slot;
import com.isode.stroke.signals.Slot1;
import com.isode.stroke.signals.Slot2;
import java.util.ArrayList;
import java.util.Collection;
public class Connector {
public static Connector create(String hostname, DomainNameResolver resolver, ConnectionFactory connectionFactory, TimerFactory timerFactory) {
return new Connector(hostname, resolver, connectionFactory, timerFactory);
}
public void setTimeoutMilliseconds(int milliseconds) {
timeoutMilliseconds = milliseconds;
}
public void start() {
assert currentConnection == null;
assert serviceQuery == null;
assert timer == null;
queriedAllServices = false;
serviceQuery = resolver.createServiceQuery("_xmpp-client._tcp." + hostname);
serviceQuery.onResult.connect(new Slot1<Collection<DomainNameServiceQuery.Result>>() {
public void call(Collection<Result> p1) {
handleServiceQueryResult(p1);
}
});
if (timeoutMilliseconds > 0) {
timer = timerFactory.createTimer(timeoutMilliseconds);
timer.onTick.connect(new Slot() {
public void call() {
handleTimeout();
}
});
timer.start();
}
serviceQuery.run();
}
public void stop() {
finish(null);
}
public final Signal1<Connection> onConnectFinished = new Signal1<Connection>();
private Connector(String hostname, DomainNameResolver resolver, ConnectionFactory connectionFactory, TimerFactory timerFactory) {
this.hostname = hostname;
this.resolver = resolver;
this.connectionFactory = connectionFactory;
this.timerFactory = timerFactory;
}
private void handleServiceQueryResult(Collection<Result> result) {
serviceQueryResults = new ArrayList<Result>();
serviceQueryResults.addAll(result);
serviceQuery = null;
tryNextServiceOrFallback();
}
private void handleAddressQueryResult(Collection<HostAddress> addresses, DomainNameResolveError error) {
//std::cout << "Connector::handleAddressQueryResult(): Start" << std::endl;
addressQuery = null;
if (error != null || addresses.isEmpty()) {
if (!serviceQueryResults.isEmpty()) {
serviceQueryResults.remove(0);
}
tryNextServiceOrFallback();
}
else {
addressQueryResults = new ArrayList<HostAddress>();
addressQueryResults.addAll(addresses);
tryNextAddress();
}
}
private void queryAddress(String hostname) {
assert addressQuery == null;
addressQuery = resolver.createAddressQuery(hostname);
addressQuery.onResult.connect(new Slot2<Collection<HostAddress>, DomainNameResolveError>() {
public void call(Collection<HostAddress> p1, DomainNameResolveError p2) {
handleAddressQueryResult(p1, p2);
}
});
addressQuery.run();
}
private void tryNextServiceOrFallback() {
if (queriedAllServices) {
//std::cout << "Connector::tryNextServiceOrCallback(): Queried all hosts. Error." << std::endl;
finish(null);
}
else if (serviceQueryResults.isEmpty()) {
//std::cout << "Connector::tryNextHostName(): Falling back on A resolution" << std::endl;
// Fall back on simple address resolving
queriedAllServices = true;
queryAddress(hostname);
}
else {
//std::cout << "Connector::tryNextHostName(): Querying next address" << std::endl;
queryAddress(serviceQueryResults.get(0).hostname);
}
}
private void tryNextAddress() {
if (addressQueryResults.isEmpty()) {
//std::cout << "Connector::tryNextAddress(): Done trying addresses. Moving on" << std::endl;
// Done trying all addresses. Move on to the next host.
if (!serviceQueryResults.isEmpty()) {
serviceQueryResults.remove(0);
}
tryNextServiceOrFallback();
}
else {
//std::cout << "Connector::tryNextAddress(): trying next address." << std::endl;
HostAddress address = addressQueryResults.get(0);
addressQueryResults.remove(0);
int port = 5222;
if (!serviceQueryResults.isEmpty()) {
port = serviceQueryResults.get(0).port;
}
tryConnect(new HostAddressPort(address, port));
}
}
private void tryConnect(HostAddressPort target) {
assert currentConnection == null;
//std::cout << "Connector::tryConnect() " << target.getAddress().toString() << " " << target.getPort() << std::endl;
currentConnection = connectionFactory.createConnection();
currentConnectionConnectFinishedConnection = currentConnection.onConnectFinished.connect(new Slot1<Boolean>() {
public void call(Boolean p1) {
handleConnectionConnectFinished(p1);
}
});
currentConnection.connect(target);
}
private void handleConnectionConnectFinished(boolean error) {
//std::cout << "Connector::handleConnectionConnectFinished() " << error << std::endl;
currentConnectionConnectFinishedConnection.disconnect();
if (error) {
currentConnection = null;
if (!addressQueryResults.isEmpty()) {
tryNextAddress();
}
else {
if (!serviceQueryResults.isEmpty()) {
serviceQueryResults.remove(0);
}
tryNextServiceOrFallback();
}
}
else {
finish(currentConnection);
}
}
private void finish(Connection connection) {
if (timer != null) {
timer.stop();
timer.onTick.disconnectAll();
timer = null;
}
if (serviceQuery != null) {
serviceQuery.onResult.disconnectAll();
serviceQuery = null;
}
if (addressQuery != null) {
addressQuery.onResult.disconnectAll();
addressQuery = null;
}
if (currentConnection != null) {
currentConnectionConnectFinishedConnection.disconnect();
currentConnection = null;
}
onConnectFinished.emit(connection);
}
private void handleTimeout() {
finish(null);
}
private String hostname;
private DomainNameResolver resolver;
private ConnectionFactory connectionFactory;
private TimerFactory timerFactory;
private int timeoutMilliseconds = 0;
private Timer timer;
private DomainNameServiceQuery serviceQuery;
private ArrayList<DomainNameServiceQuery.Result> serviceQueryResults;
private DomainNameAddressQuery addressQuery;
private ArrayList<HostAddress> addressQueryResults;
private boolean queriedAllServices = true;
private Connection currentConnection;
private SignalConnection currentConnectionConnectFinishedConnection;
}
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Swift