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org.apache.activemq.apollo.mqtt.MqttSession Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.activemq.apollo.mqtt;
import org.apache.activemq.apollo.broker.*;
import org.apache.activemq.apollo.broker.protocol.RawMessage;
import org.apache.activemq.apollo.broker.protocol.RawMessageCodec$;
import org.apache.activemq.apollo.broker.security.SecurityContext;
import org.apache.activemq.apollo.broker.store.StoreUOW;
import org.apache.activemq.apollo.filter.FilterException;
import org.apache.activemq.apollo.mqtt.MqttSessionManager.HostState;
import org.apache.activemq.apollo.mqtt.MqttSessionManager.SessionState;
import org.apache.activemq.apollo.util.*;
import org.apache.activemq.apollo.util.path.Path$;
import org.apache.activemq.apollo.util.path.PathMap;
import org.apache.activemq.apollo.util.path.PathParser;
import org.fusesource.hawtbuf.Buffer;
import org.fusesource.hawtbuf.UTF8Buffer;
import org.fusesource.hawtdispatch.*;
import org.fusesource.mqtt.client.QoS;
import org.fusesource.mqtt.client.Topic;
import org.fusesource.mqtt.codec.*;
import scala.Option;
import scala.Tuple2;
import java.net.ProtocolException;
import java.util.*;
import static org.fusesource.hawtdispatch.Dispatch.NOOP;
import static org.fusesource.hawtdispatch.Dispatch.createQueue;
import static org.apache.activemq.apollo.mqtt.MqttProtocolHandler.*;
/**
* An MqttSession can be switch from one connection/protocol handler to another,
* but it will only be associated with one at a time. An MqttSession tracks
* the state of the communication with a client.
*
* @author Hiram Chirino
*/
public class MqttSession {
public final HostState host_state;
public final UTF8Buffer client_id;
public final SessionState session_state;
public final DispatchQueue queue;
public MqttSession(HostState host_state, UTF8Buffer client_id, SessionState session_state) {
this.host_state = host_state;
this.client_id = client_id;
this.queue = createQueue("mqtt: " + client_id);
this.session_state = session_state;
}
public boolean manager_disconnected = false;
public MqttProtocolHandler handler;
public SecurityContext security_context;
public boolean clean_session = false;
public CONNECT connect_message;
public DestinationParser destination_parser = MqttProtocol.destination_parser;
boolean publish_body = false;
public VirtualHost host() {
return host_state.host;
}
public void connect(final MqttProtocolHandler next) {
queue.execute(new Task() {
public void run() {
if (manager_disconnected) {
// we are not the assignment anymore.. go to the session manager
// again to setup a new session.
MqttSessionManager.attach(host(), client_id, next);
} else {
// so that we don't switch again until this current switch completes
queue.suspend();
if (handler != null) {
detach();
handler = null;
}
queue.execute(new Task() {
public void run() {
handler = next;
attach();
}
});
// switch the connection to the session queue..
next.connection()._set_dispatch_queue(queue, new Task() {
public void run() {
queue.resume();
}
});
}
}
});
}
public void disconnect(final MqttProtocolHandler prev) {
queue.execute(new Task() {
@Override
public void run() {
if (handler == prev) {
MqttSessionManager.remove(host_state, client_id);
manager_disconnected = true;
detach();
handler = null;
}
}
});
}
/////////////////////////////////////////////////////////////////////
//
// Bits that deal with connections attaching/detaching from the session
//
/////////////////////////////////////////////////////////////////////
public void attach() {
queue.assertExecuting();
final MqttProtocolHandler h = handler;
clean_session = h.connect_message.cleanSession();
security_context = h.security_context;
h.command_handler = new UnitFn1() {
@Override
public void call(Object v1) {
on_transport_command(v1);
}
};
destination_parser = h.destination_parser();
mqtt_consumer().consumer_sink.downstream_$eq(Scala2Java.some(h.sink_manager.open()));
final Task ack_connect = new Task() {
@Override
public void run() {
queue.assertExecuting();
connect_message = h.connect_message;
CONNACK connack = new CONNACK();
connack.code(CONNACK.Code.CONNECTION_ACCEPTED);
send(connack);
}
};
if (!clean_session) {
// Setup the previous subscriptions..
session_state.strategy.create(host().store(), client_id);
if (!session_state.subscriptions.isEmpty()) {
h._suspend_read("subscribing");
ArrayList topics = Scala2Java.map(session_state.subscriptions.values(), new Fn1, Topic>() {
@Override
public Topic apply(Tuple2 v1) {
return v1._1();
}
});
subscribe(topics, new Task() {
@Override
public void run() {
h.resume_read();
h.queue().execute(ack_connect);
}
});
} else {
ack_connect.run();
}
} else {
// do we need to clear the received ids?
// durable_session_state.received_message_ids.clear()
session_state.subscriptions.clear();
if (session_state.durable_sub != null) {
final DestinationAddress[] addresses = new DestinationAddress[]{session_state.durable_sub};
session_state.durable_sub = null;
host().dispatch_queue().execute(new Task() {
@Override
public void run() {
host().router().delete(addresses, security_context);
}
});
}
session_state.strategy.destroy(new Task() {
@Override
public void run() {
ack_connect.run();
}
});
}
}
public void detach() {
queue.assertExecuting();
if (!producerRoutes.isEmpty()) {
final ArrayList routes = new ArrayList(producerRoutes.values());
host().dispatch_queue().execute(new Task() {
@Override
public void run() {
for (MqttProducerRoute route : routes) {
host().router().disconnect(new ConnectAddress[]{route.address}, route);
}
}
});
producerRoutes.clear();
}
if (clean_session) {
if (!mqtt_consumer().addresses.isEmpty()) {
final BindAddress[] addresses = mqtt_consumer().addresses.keySet().toArray(new BindAddress[mqtt_consumer().addresses.size()]);
host().dispatch_queue().execute(new Runnable() {
@Override
public void run() {
host().router().unbind(addresses, mqtt_consumer(), false, security_context);
}
});
mqtt_consumer().addresses.clear();
}
session_state.subscriptions.clear();
} else {
if (session_state.durable_sub != null) {
final BindAddress[] addresses = new BindAddress[]{session_state.durable_sub};
host().dispatch_queue().execute(new Runnable() {
@Override
public void run() {
host().router().unbind(addresses, mqtt_consumer(), false, security_context);
}
});
mqtt_consumer().addresses.clear();
session_state.durable_sub = null;
}
}
for (Request request : in_flight_publishes.values()) {
if (request.ack != null) {
request.ack.apply(
request.delivered ? Delivered$.MODULE$ : Undelivered$.MODULE$
);
}
}
in_flight_publishes.clear();
handler.sink_manager.close(mqtt_consumer().consumer_sink.downstream().get(), Scala2Java.noopFn1());
mqtt_consumer().consumer_sink.downstream_$eq(Scala2Java.>none());
handler.on_transport_disconnected();
}
public SimpleAddress decode_destination(UTF8Buffer value) {
SimpleAddress rc = destination_parser.decode_single_destination(value.toString(), Scala2Java.toScala(new Fn1() {
public SimpleAddress apply(String name) {
return new SimpleAddress("topic", destination_parser.decode_path(name));
}
}));
if (rc == null && handler != null) {
handler.die("Invalid mqtt destination name: " + value);
}
return rc;
}
/////////////////////////////////////////////////////////////////////
//
// Bits that deal with assigning message ids to QoS > 0 requests
// and tracking those requests so that they can get replayed on a
// reconnect.
//
/////////////////////////////////////////////////////////////////////
final HashMap in_flight_publishes = new HashMap();
public void send(MessageSupport.Message message) {
queue.assertExecuting();
handler.connection_sink.offer(new Request((short) 0, message, null));
}
public void publish_completed(short id) {
queue.assertExecuting();
Request request = in_flight_publishes.remove(id);
if (request != null) {
if (request.ack != null) {
request.ack.apply(Consumed$.MODULE$);
}
} else {
// It's possible that on a reconnect, we get an ACK
// in for message that was not dispatched yet. store
// a place holder so we ack it upon the dispatch
// attempt.
in_flight_publishes.put(id, new Request(id, null, null));
}
}
/////////////////////////////////////////////////////////////////////
//
// Bits that deal with processing new messages from the client.
//
/////////////////////////////////////////////////////////////////////
public void on_transport_command(Object o) {
try {
if (o.getClass() == MQTTFrame.class) {
MQTTFrame command = (MQTTFrame) o;
switch (command.messageType()) {
case PUBLISH.TYPE: {
on_mqtt_publish(received(new PUBLISH().decode(command)));
break;
}
// This follows a Publish with QoS EXACTLY_ONCE
case PUBREL.TYPE: {
final PUBREL ack = received(new PUBREL().decode(command));
// TODO: perhaps persist the processed list.. otherwise
// we can't filter out dups after a broker restart.
session_state.received_message_ids.remove(ack.messageId());
session_state.strategy.update(new Task() {
@Override
public void run() {
send(new PUBCOMP().messageId(ack.messageId()));
}
});
break;
}
case SUBSCRIBE.TYPE: {
on_mqtt_subscribe(received(new SUBSCRIBE().decode(command)));
break;
}
case UNSUBSCRIBE.TYPE: {
on_mqtt_unsubscribe(received(new UNSUBSCRIBE().decode(command)));
break;
}
// AT_LEAST_ONCE ack flow for a client subscription
case PUBACK.TYPE: {
PUBACK ack = received(new PUBACK().decode(command));
publish_completed(ack.messageId());
break;
}
// EXACTLY_ONCE ack flow for a client subscription
case PUBREC.TYPE: {
PUBREC ack = received(new PUBREC().decode(command));
send(new PUBREL().messageId(ack.messageId()));
break;
}
case PUBCOMP.TYPE: {
PUBCOMP ack = received(new PUBCOMP().decode(command));
publish_completed(ack.messageId());
break;
}
case PINGREQ.TYPE: {
received(new PINGREQ().decode(command));
send(new PINGRESP());
break;
}
case DISCONNECT.TYPE: {
received(new DISCONNECT());
MqttSessionManager.disconnect(host_state, client_id, handler);
break;
}
default: {
handler.die("Invalid MQTT message type: " + command.messageType());
break;
}
}
} else if ("failure".equals(o)) {
// Publish the client's will
publish_will(new Task() {
@Override
public void run() {
// then disconnect him.
MqttSessionManager.disconnect(host_state, client_id, handler);
}
});
} else {
handler.die("Internal Server Error: unexpected mqtt command: " + o.getClass());
}
} catch (ProtocolException e) {
handler.die("Internal Server Error: " + e);
}
}
/////////////////////////////////////////////////////////////////////
//
// Bits that deal with processing PUBLISH messages
//
/////////////////////////////////////////////////////////////////////
LRUCache producerRoutes = new LRUCache(10) {
@Override
protected void onCacheEviction(final Map.Entry eldest) {
host().dispatch_queue().execute(new Task() {
@Override
public void run() {
ConnectAddress[] array = new ConnectAddress[]{eldest.getValue().address};
host().router().disconnect(array, eldest.getValue());
}
});
}
};
class MqttProducerRoute extends DeliveryProducerRoute {
public final SimpleAddress address;
public final MqttProtocolHandler handler;
boolean suspended = false;
public MqttProducerRoute(SimpleAddress address, MqttProtocolHandler h) {
super(host().router());
this.address = address;
this.handler = h;
this.refiller_$eq(new Task() {
@Override
public void run() {
if (suspended) {
suspended = false;
handler.resume_read();
}
}
});
}
@Override
public int send_buffer_size() {
return handler.codec.getReadBufferSize();
}
@Override
public Option connection() {
return Scala2Java.some(handler.connection());
}
@Override
public DispatchQueue dispatch_queue() {
return queue;
}
}
public void on_mqtt_publish(final PUBLISH publish) {
if ((publish.qos() == QoS.EXACTLY_ONCE) && session_state.received_message_ids.contains(publish.messageId())) {
PUBREC response = new PUBREC();
response.messageId(publish.messageId());
send(response);
return;
}
handler.messages_received.incrementAndGet();
queue.assertExecuting();
MqttProducerRoute route = producerRoutes.get(publish.topicName());
if (route == null) {
// create the producer route...
final SimpleAddress destination = decode_destination(publish.topicName());
final MqttProducerRoute froute = route = new MqttProducerRoute(destination, handler);
// don't process commands until producer is connected...
route.handler._suspend_read("route publish lookup");
host().dispatch_queue().execute(new Task() {
@Override
public void run() {
host().router().connect(new ConnectAddress[]{destination}, froute, security_context);
queue.execute(new Runnable() {
@Override
public void run() {
// We don't care if we are not allowed to send..
if (!froute.handler.connection().stopped()) {
froute.handler.resume_read();
producerRoutes.put(publish.topicName(), froute);
send_via_route(froute, publish);
}
}
});
}
});
} else {
// we can re-use the existing producer route
send_via_route(route, publish);
}
}
class AtLeastOnceProducerAck extends UnitFn2 {
public final PUBLISH publish;
AtLeastOnceProducerAck(PUBLISH publish) {
this.publish = publish;
}
public void call(final DeliveryResult r, final StoreUOW uow) {
queue.execute(new Task() {
@Override
public void run() {
PUBACK response = new PUBACK();
response.messageId(publish.messageId());
send(response);
}
});
}
}
class ExactlyOnceProducerAck extends AtLeastOnceProducerAck {
ExactlyOnceProducerAck(PUBLISH publish) {
super(publish);
}
public void call(final DeliveryResult r, final StoreUOW uow) {
queue.execute(new Task() {
@Override
public void run() {
// TODO: perhaps persist the processed list..
session_state.received_message_ids.add(publish.messageId());
session_state.strategy.update(new Task() {
@Override
public void run() {
PUBREC response = new PUBREC();
response.messageId(publish.messageId());
send(response);
}
});
}
});
}
}
public void send_via_route(MqttProducerRoute route, PUBLISH publish) {
queue.assertExecuting();
AtLeastOnceProducerAck ack = null;
if (publish.qos() == QoS.AT_LEAST_ONCE) {
ack = new AtLeastOnceProducerAck(publish);
} else if (publish.qos() == QoS.EXACTLY_ONCE) {
ack = new ExactlyOnceProducerAck(publish);
}
if (!route.targets().isEmpty()) {
Delivery delivery = new Delivery();
delivery.message_$eq(new RawMessage(publish.payload()));
delivery.persistent_$eq(publish.qos().ordinal() > 0);
delivery.size_$eq(publish.payload().length);
delivery.ack_$eq(Scala2Java.toScala(ack));
if (publish.retain()) {
if (delivery.size() == 0) {
delivery.retain_$eq(RetainRemove$.MODULE$);
} else {
delivery.retain_$eq(RetainSet$.MODULE$);
}
}
// routes can always accept at least 1 delivery...
assert !route.full();
route.offer(delivery);
if (route.full()) {
// but once it gets full.. suspend to flow control the producer.
route.suspended = true;
handler._suspend_read("blocked sending to: " + route.address);
}
} else {
if (ack != null) {
ack.apply(null, null);
}
}
}
public void publish_will(final Task complete_close) {
if (connect_message != null) {
if (connect_message.willTopic() == null) {
complete_close.run();
} else {
final SimpleAddress destination = decode_destination(connect_message.willTopic());
final DeliveryProducerRoute prodcuer = new DeliveryProducerRoute(host().router()) {
{
refiller_$eq(NOOP);
}
@Override
public int send_buffer_size() {
return 1024 * 64;
}
@Override
public Option connection() {
return handler != null ? Scala2Java.some(handler.connection()) : Scala2Java.none();
}
@Override
public DispatchQueue dispatch_queue() {
return queue;
}
};
host().dispatch_queue().execute(new Task() {
@Override
public void run() {
host().router().connect(new ConnectAddress[]{destination}, prodcuer, security_context);
queue.execute(new Task() {
@Override
public void run() {
if (prodcuer.targets().isEmpty()) {
complete_close.run();
} else {
Delivery delivery = new Delivery();
delivery.message_$eq(new RawMessage(connect_message.willMessage()));
delivery.size_$eq(connect_message.willMessage().length);
delivery.persistent_$eq(connect_message.willQos().ordinal() > 0);
if (connect_message.willRetain()) {
if (delivery.size() == 0) {
delivery.retain_$eq(RetainRemove$.MODULE$);
} else {
delivery.retain_$eq(RetainSet$.MODULE$);
}
}
delivery.ack_$eq(Scala2Java.toScala(new UnitFn2() {
@Override
public void call(DeliveryResult x, StoreUOW y) {
host().dispatch_queue().execute(new Task() {
@Override
public void run() {
host().router().disconnect(new ConnectAddress[]{destination}, prodcuer);
}
});
complete_close.run();
}
}));
handler.messages_received.incrementAndGet();
prodcuer.offer(delivery);
}
}
});
}
});
}
}
}
/////////////////////////////////////////////////////////////////////
//
// Bits that deal with subscriptions
//
/////////////////////////////////////////////////////////////////////
public void on_mqtt_subscribe(final SUBSCRIBE sub) {
subscribe(Arrays.asList(sub.topics()), new Task() {
@Override
public void run() {
queue.execute(new Task() {
@Override
public void run() {
session_state.strategy.update(new Task() {
@Override
public void run() {
SUBACK suback = new SUBACK();
suback.messageId(sub.messageId());
byte[] granted = new byte[sub.topics().length];
int i = 0;
for (Topic topic : sub.topics()) {
granted[i] = (byte) topic.qos().ordinal();
i++;
}
suback.grantedQos(granted);
send(suback);
}
});
}
});
}
});
}
public void subscribe(Collection topics, final Task on_subscribed) {
final ArrayList addresses = Scala2Java.map(topics, new Fn1() {
@Override
public BindAddress apply(Topic topic) {
BindAddress address = decode_destination(topic.name());
session_state.subscriptions.put(topic.name(), new Tuple2(topic, address));
mqtt_consumer().addresses.put(address, topic.qos());
if (PathParser.containsWildCards(address.path())) {
mqtt_consumer().wildcards.put(address.path(), topic.qos());
}
return address;
}
});
handler.subscription_count = mqtt_consumer().addresses.size();
if (!clean_session) {
Set bindAddressSet = mqtt_consumer().addresses.keySet();
SubscriptionAddress durable_sub = new SubscriptionAddress(Path$.MODULE$.create(client_id.toString()), null, bindAddressSet.toArray(new BindAddress[bindAddressSet.size()]));
session_state.durable_sub = durable_sub;
addresses.clear();
addresses.add(durable_sub);
}
host().dispatch_queue().execute(new Task() {
@Override
public void run() {
for (BindAddress address : addresses) {
host().router().bind(new BindAddress[]{address}, mqtt_consumer(), security_context, Scala2Java.>noopFn1());
}
on_subscribed.run();
}
});
}
public void on_mqtt_unsubscribe(final UNSUBSCRIBE unsubscribe) {
ArrayList addressesList = Scala2Java.flatMap(Arrays.asList(unsubscribe.topics()), new Fn1>() {
@Override
public Option apply(UTF8Buffer topicName) {
Tuple2 removed = session_state.subscriptions.remove(topicName);
if (removed != null) {
Topic topic = removed._1();
BindAddress address = removed._2();
mqtt_consumer().addresses.remove(address);
if (PathParser.containsWildCards(address.path())) {
mqtt_consumer().wildcards.remove(address.path(), topic.qos());
}
return Scala2Java.some(address);
} else {
return Scala2Java.none();
}
}
});
final BindAddress[] addresses = addressesList.toArray(new BindAddress[addressesList.size()]);
handler.subscription_count = mqtt_consumer().addresses.size();
if (!clean_session) {
Set bindAddressSet = mqtt_consumer().addresses.keySet();
session_state.durable_sub = new SubscriptionAddress(Path$.MODULE$.create(client_id.toString()), null, bindAddressSet.toArray(new BindAddress[bindAddressSet.size()]));
}
host().dispatch_queue().execute(new Task() {
@Override
public void run() {
if (clean_session) {
host().router().unbind(addresses, mqtt_consumer(), false, security_context);
} else {
if (mqtt_consumer().addresses.isEmpty()) {
host().router().unbind(new BindAddress[]{session_state.durable_sub}, mqtt_consumer(), true, security_context);
session_state.durable_sub = null;
} else {
host().router().bind(new BindAddress[]{session_state.durable_sub}, mqtt_consumer(), security_context, Scala2Java.>noopFn1());
}
}
queue.execute(new Task() {
@Override
public void run() {
session_state.strategy.update(new Task() {
@Override
public void run() {
UNSUBACK ack = new UNSUBACK();
ack.messageId(unsubscribe.messageId());
send(ack);
}
});
}
});
}
});
}
MqttConsumer _mqtt_consumer;
MqttConsumer mqtt_consumer() {
if (_mqtt_consumer == null) {
_mqtt_consumer = new MqttConsumer();
}
return _mqtt_consumer;
}
class IntPair {
int _1;
int _2;
IntPair(int int1, int int2) {
this._1 = int1;
this._2 = int2;
}
}
class MqttConsumer extends AbstractRetainedDeliveryConsumer {
@Override
public String toString() {
return "mqtt client:" + client_id + " remote address: " + security_context.remote_address();
}
public DispatchQueue dispatch_queue() {
return queue;
}
public HashMap addresses = new HashMap();
public PathMap wildcards = new PathMap();
CustomDispatchSource credit_window_source = Dispatch.createSource(new EventAggregator() {
public IntPair mergeEvent(IntPair previous, IntPair event) {
if (previous == null) {
return event;
} else {
return new IntPair(previous._1 + event._1, previous._2 + event._2);
}
}
public IntPair mergeEvents(IntPair previous, IntPair events) {
return mergeEvent(previous, events);
}
}, queue);
{
credit_window_source.setEventHandler(new Task() {
@Override
public void run() {
IntPair data = credit_window_source.getData();
credit_window_filter.credit(data._1, data._2);
}
});
credit_window_source.resume();
}
//
MutableSink consumer_sink = new MutableSink();
{
consumer_sink.downstream_$eq(Scala2Java.>none());
}
public LongCounter next_seq_id = new LongCounter(0);
public long get_next_seq_id() {
return next_seq_id.getAndIncrement();
}
short to_message_id(long value) {
return (short)
(0x8000 | // MQTT message ids cannot be zero, so we always set the highest bit.
(value & 0x7FFF)); // the lower 15 bits come for the original seq id.
}
CreditWindowFilter, Delivery>> credit_window_filter = new CreditWindowFilter, Delivery>>(consumer_sink.flatMap(Scala2Java.toScala(new Fn1, Delivery>, Option>() {
public Option apply(Tuple2, Delivery> event) {
queue.assertExecuting();
Session session = event._1();
final Delivery delivery = event._2();
session_manager.delivered(session, delivery.size());
// Look up which QoS we need to send this message with..
SimpleAddress topic = delivery.sender().head().simple();
QoS qos = addresses.get(topic);
if (qos == null) {
qos = Scala2Java.head(wildcards.get(topic.path()));
}
if (qos == null) {
acked(delivery, Consumed$.MODULE$);
return Scala2Java.none();
} else {
PUBLISH publish = new PUBLISH();
publish.topicName(new UTF8Buffer(destination_parser.encode_destination(delivery.sender().head())));
if (delivery.redeliveries() > 0) {
publish.dup(true);
}
if (delivery.message().codec() == RawMessageCodec$.MODULE$) {
publish.payload(((RawMessage) delivery.message()).payload());
} else {
if (publish_body) {
try {
publish.payload(delivery.message().getBodyAs(Buffer.class));
} catch (FilterException e) {
log.error(e, "Internal Server Error: Could not covert message body to a Buffer");
}
} else {
publish.payload(delivery.message().encoded());
}
}
handler.messages_sent.incrementAndGet();
UnitFn1 ack = new UnitFn1() {
@Override
public void call(DeliveryResult result) {
acked(delivery, result);
}
};
if (delivery.ack() != null && (qos != QoS.AT_MOST_ONCE)) {
publish.qos(qos);
short id = to_message_id(clean_session ?
get_next_seq_id() : // generate our own seq id.
delivery.seq() // use the durable sub's seq id..
);
publish.messageId(id);
Request request = new Request(id, publish, ack);
Request prev = in_flight_publishes.put(id, request);
if (prev != null) {
// A reconnecting client could have acked before
// we get dispatched by the durable sub.
if (prev.message == null) {
in_flight_publishes.remove(id);
acked(delivery, Consumed$.MODULE$);
} else {
// Looks we sent out a msg with that id. This could only
// happen once we send out 0x7FFF message and the first
// one has not been acked.
handler.async_die("Client not acking regularly.", null);
}
}
return Scala2Java.some(request);
} else {
// This callback gets executed once the message
// sent to the transport.
publish.qos(QoS.AT_MOST_ONCE);
return Scala2Java.some(new Request((short) 0, publish, ack));
}
}
}
})), SessionDeliverySizer.INSTANCE);
public void acked(Delivery delivery, DeliveryResult result) {
queue.assertExecuting();
credit_window_source.merge(new IntPair(delivery.size(), 1));
if (delivery.ack() != null) {
delivery.ack().apply(result, null);
}
}
{
credit_window_filter.credit(handler.codec.getWriteBufferSize() * 2, 1);
}
SessionSinkMux session_manager = new SessionSinkMux(credit_window_filter, queue, Delivery$.MODULE$, Integer.MAX_VALUE / 2, receive_buffer_size()) {
@Override
public long time_stamp() {
return host().broker().now();
}
};
private void super_dispose() {
super.dispose();
}
@Override
protected void dispose() {
queue.execute(new Task() {
@Override
public void run() {
super_dispose();
}
});
}
@Override
public Option connection() {
return handler != null ? Scala2Java.some(handler.connection()) : Scala2Java.none();
}
@Override
public int receive_buffer_size() {
return 1024 * 64;
}
@Override
public boolean is_persistent() {
return false;
}
@Override
public boolean matches(Delivery message) {
return true;
}
//
// Each destination we subscribe to will establish a session with us.
//
class MqttConsumerSession extends AbstractSessionSinkFilter implements DeliverySession {
final DeliveryProducer producer;
final SessionSink downstream;
MqttConsumerSession(DeliveryProducer producer) {
producer.dispatch_queue().assertExecuting();
this.producer = producer;
downstream = session_manager.open(producer.dispatch_queue());
retain();
}
@Override
public SessionSink downstream_session_sink() {
return downstream;
}
@Override
public DeliveryProducer producer() {
return producer;
}
@Override
public String toString() {
if (handler == null) {
return "unconnected";
} else {
return "connection to " + handler.connection().transport().getRemoteAddress();
}
}
public MqttConsumer consumer() {
return mqtt_consumer();
}
public boolean closed = false;
public void close() {
producer.dispatch_queue().assertExecuting();
if (!closed) {
closed = true;
dispose();
}
}
public void dispose() {
session_manager.close(downstream(), Scala2Java.toScala(new UnitFn1() {
@Override
public void call(Delivery delivery) {
// We have been closed so we have to nak any deliveries.
if (delivery.ack() != null) {
delivery.ack().apply(Undelivered$.MODULE$, delivery.uow());
}
}
}));
release();
}
@Override
public boolean offer(Delivery delivery) {
if (full()) {
return false;
} else {
delivery.message().retain();
boolean rc = downstream().offer(delivery);
assert rc : "offer should be accepted since it was not full";
return true;
}
}
}
public MqttConsumerSession connect(DeliveryProducer p) {
return new MqttConsumerSession(p);
}
}
}
