I am using Spring's spring-integration-mqtt and i can connect to a single Mqtt server and can receive messages on subscribed topics , and now i want to make application which can connect to multiple Mqtt Servers and can receive data from every connection and i want to manage it as dynamic where i can add more Mqtt servers from database or text file.
a simple bean for single Mqtt connection for subscription is as follow
#Bean
public MessageProducer inbound() {
MqttPahoMessageDrivenChannelAdapter adapter2 =
new MqttPahoMessageDrivenChannelAdapter("tcp://192.168.100.1:1883","mqtt_virtual_received_sus_2",
"DATA/#", "LD/#","CONF/#","CONFIG/#");
adapter2.setCompletionTimeout(0);
adapter2.setConverter(new DefaultPahoMessageConverter());
adapter2.setQos(2);
adapter2.setOutputChannel(mqttInputChannel());
return adapter2;
}
above code creates a connection for the mqtt server and can receive messages and if i copy paste the same code twice for second server with different Mqtt ip address i can connect to both Mqtt Server as follows
#Bean
public MessageProducer inbound() {
MqttPahoMessageDrivenChannelAdapter adapter2 =
new MqttPahoMessageDrivenChannelAdapter("tcp://192.168.100.1:1883","mqtt_virtual_received_sus_2",
"DATA/#", "LD/#","CONF/#","CONFIG/#");
adapter2.setCompletionTimeout(0);
adapter2.setConverter(new DefaultPahoMessageConverter());
adapter2.setQos(2);
adapter2.setOutputChannel(mqttInputChannel());
return adapter2;
}
#Bean
public MessageProducer inbound2() {
MqttPahoMessageDrivenChannelAdapter adapter2 =
new MqttPahoMessageDrivenChannelAdapter("tcp://192.168.100.14:1883","mqtt_virtual_received_sus_1",
"DATA/#", "LD/#","CONF/#","CONFIG/#");
adapter2.setCompletionTimeout(0);
adapter2.setConverter(new DefaultPahoMessageConverter());
adapter2.setQos(2);
adapter2.setOutputChannel(mqttInputChannel());
return adapter2;
}
above code also works fine and i can receive message from both Mqtt Servers, but is there any way i can manage it dynamically like as follows, i change the bean's return type to list, but didn't worked:
#Bean
public List<MqttPahoMessageDrivenChannelAdapter> getAdapter () {
List<MqttPahoMessageDrivenChannelAdapter > logConfList=new ArrayList<MqttPahoMessageDrivenChannelAdapter>();
MqttPahoMessageDrivenChannelAdapter adapter2 =
new MqttPahoMessageDrivenChannelAdapter("tcp://192.168.100.1:1883","mqtt_virtual_received_sus_2",
"DATA/#", "LD/#","CONF/#","CONFIG/#");
adapter2.setCompletionTimeout(0);
adapter2.setConverter(new DefaultPahoMessageConverter());
adapter2.setQos(2);
adapter2.setOutputChannel(mqttInputChannel() );
MqttPahoMessageDrivenChannelAdapter adapter =
new MqttPahoMessageDrivenChannelAdapter("tcp://192.168.100.14:1883","mqtt_virtual_received_sus_1",
"DATA/#", "LD/#","CONF/#","CONFIG/#");
adapter.setCompletionTimeout(0);
adapter.setConverter(new DefaultPahoMessageConverter());
adapter.setQos(2);
adapter.setOutputChannel(mqttInputChannel() );
logConfList.add(adapter);
logConfList.add(adapter2);
return logConfList;
}
is there any way i can manage these beans dynamically, where i can fetch mqtt server details from text file and in a for loop or something i can manage multiple connections.
See Dynamic and runtime Integration Flows.
#Autowired
private IntegrationFlowContext flowContext;
private IntegrationFlowRegistration addAnAdapter(String uri, String clientId, MessageChannel channel,
String... topics) {
MqttPahoMessageDrivenChannelAdapter adapter = new MqttPahoMessageDrivenChannelAdapter(uri, clientId, topics);
// more adapter configuration
IntegrationFlow flow = IntegrationFlows.from(adapter)
.channel(channel)
.get();
return this.flowContext.registration(flow).register();
}
private void removeAdapter(IntegrationFlowRegistration flowReg) {
this.flowContext.remove(flowReg.getId());
}
Related
I have a SpringBoot application that also uses SpringIntegration to dynamically create web sockets upon requests that come from an Angular web application and send messages on that web sockets that are taken from a BlockingQueue.
I want those messages to be pushed on the web socket only when a message is available on the BlockingQueue, so without polling.
At the moment, my code looks like below, but it is very inefficient:
#Service
public class WebSocketPublisherService {
#Autowired
private IntegrationFlowContext integrationFlowContext;
#Bean
public HandshakeHandler handshakeHandler() {
return new DefaultHandshakeHandler(new TomcatRequestUpgradeStrategy());
}
public void createWebSocket() {
ServerWebSocketContainer serverWebSocketContainer = new ServerWebSocketContainer("/test")
.setHandshakeHandler(handshakeHandler())
.setAllowedOrigins("http://localhost:4200");
serverWebSocketContainer.setMessageListener(...); // I want messages comming from the web application to be processed
WebSocketOutboundMessageHandler webSocketOutboundMessageHandler = new WebSocketOutboundMessageHandler(serverWebSocketContainer);
MethodInvokingMessageSource methodInvokingMessageSource = new MethodInvokingMessageSource();
methodInvokingMessageSource.setObject(...);
methodInvokingMessageSource.setMethodName(...); // this method returns the element from the BlockingQueue, if it exists
StandardIntegrationFlow standardIntegrationFlow = IntegrationFlow
.from(methodInvokingMessageSource, polling -> polling.poller(pollerFactory -> pollerFactory.fixedRate(10)))
.split(new DecorateMessageWithSessionId(serverWebSocketContainer))
.handle(webSocketOutboundMessageHandler)
.get();
IntegrationFlowContext.IntegrationFlowRegistration flowRegistration = integrationFlowContext
.registration(standardIntegrationFlow)
.addBean(serverWebSocketContainer)
.register();
flowRegistration.start();
}
}
Is there a smarter way of creating an IntegrationFlow using the content of a BlockingQueue (based on subscription and not polling)?
I configured a TCP Client with the Java DSL of Spring Integration. It looks like this
#Bean
public TcpSendingMessageHandler tcpClient()
{
return Tcp
.outboundAdapter(
Tcp.nioClient("localhost", 9060)
.deserializer(new ByteArrayLfSerializer())
.soKeepAlive(false)
.leaveOpen(false)
.taskExecutor(Executors.newSingleThreadExecutor())
.get()
)
.clientMode(false)
.get();
}
And I am using it in a Service to send messages to the TCP socket the client is connected to:
#Slf4j
#Service
public class TcpClientConnectionService
{
private final TcpSendingMessageHandler messageHandler;
#Autowired
public TcpClientConnectionService(final TcpSendingMessageHandler messageHandler)
{
this.messageHandler = messageHandler;
this.messageHandler.start();
}
public void sendMessage(final String message)
{
messageHandler.handleMessage(new GenericMessage<>(message));
log.debug("Message: " + message + " send");
}
}
But in production I am getting the follwing warning rather regulary and I do not know what the issue is and how to fix it.
o.s.i.i.tcp.connection.TcpNioConnection : No publisher available to
publish TcpConnectionOpenEvent
o.s.i.i.tcp.connection.TcpNioConnection : No publisher available to
publish TcpConnectionCloseEvent
It would be great if somebody could help me out since I was not able to find anything by googling.
The nested factory is not initialized properly because you are incorrectly calling .get() on the spec, which subverts Spring initialization.
I configured a TCP Client with the Java DSL of Spring Integration. It looks like this
#Bean
public TcpSendingMessageHandler tcpClient()
{
return Tcp
.outboundAdapter(
Tcp.nioClient("localhost", 9060)
.deserializer(new ByteArrayLfSerializer())
.soKeepAlive(false)
.leaveOpen(false)
.taskExecutor(Executors.newSingleThreadExecutor()))
.clientMode(false)
.get();
}
Or move the factory definition to a top level #Bean.
I am trying to use spring integration for send mqtt messages to a broker and I am trying to use the gateway interface.
#Bean
public MqttPahoClientFactory mqttClientFactory() {
DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
//set the factory details
return factory:
}
#Bean
#ServiceActivator(inputChannel = "mqttOutboundChannel")
public MessageHandler mqttOutbound() {
MqttPahoMessageHandler messageHandler =
new MqttPahoMessageHandler("randomString", mqttClientFactory());
//set handler details
messageHandler.setDefaultTopic(topic);
return messageHandler;
}
#Bean
public MessageChannel mqttOutboundChannel() {
return new DirectChannel();
}
#MessagingGateway(defaultRequestChannel = "mqttOutboundChannel")
private interface MyGateway {
void sendToMqtt(String data);
}
My question is: If I want to use the gateway handler to send messages to different topics how would I do that without having to create an adapter for each topic ?
Thanks.
Hope I formulated my question clearly and the code is properly formatted.
You need to set the target topic in a message header.
Here is one way to do that...
void sendToMqtt(String data, #Header(MqttHeaders.TOPIC) String topic);
The gateway proxy will assemble the message with the header, which is then used by the outbound adapter.
A POJO Message.java is to be Converted to JSON(JSON is to be sent to pubsub Topic,using Spring Integration MessageChannels.),using following:
#Bean
#Transformer(inputChannel = "pubsubOutputChannel", outputChannel = "handleOutChannel")
public ObjectToJsonTransformer transformOut() {
return new ObjectToJsonTransformer();
}
#MessagingGateway(defaultRequestChannel = "pubsubOutputChannel")
public interface PubsubOutboundGateway {
void sendToPubsub(Messages msg);
}
#Bean
#ServiceActivator(inputChannel = "handleOutChannel")
public MessageHandler messageSender(PubSubOperations pubsubTemplate) {
return new PubSubMessageHandler(pubsubTemplate, "TestTopic");
}
When i call sendToPubsub() with an instance of Message.java with required properties set,i get an error "Null".
Is serviceActivator not able to receive the required data?
Any suggestions to fix this?.
Yes, it can't do that because you just don't tell it to do that.
Your gateway is configured for this:
#MessagingGateway(defaultRequestChannel = "handleOutChannel")
But that is not an input channel for the ObjectToJsonTransformer. So, whatever you send over that gateway is going directly to the messageSender service activator.
Try to configure your gateway like this:
#MessagingGateway(defaultRequestChannel = "pubsubOutputChannel")
i am creating a webapp in spring Maven with PAHO mqtt. and there are two ways to implement mqtt, one is Spring Mqtt Integration and second is a general way to create a connection object and connect/disconnect but what is the difference between them how much convenient and Reliable they are.
right now i am implementing subscribe with Spring Mqtt Integration but can't understand it can anyone please suggest some good easy tutorial.
Thank you!
See the Spring Integration MQTT Sample Spring Boot App.
Reads from stdIn sends the data over MQTT, receives the data and logs it.
// publisher
#Bean
public IntegrationFlow mqttOutFlow() {
return IntegrationFlows.from(CharacterStreamReadingMessageSource.stdin(),
e -> e.poller(Pollers.fixedDelay(1000)))
.transform(p -> p + " sent to MQTT")
.handle(mqttOutbound())
.get();
}
#Bean
public MessageHandler mqttOutbound() {
MqttPahoMessageHandler messageHandler = new MqttPahoMessageHandler("siSamplePublisher", mqttClientFactory());
messageHandler.setAsync(true);
messageHandler.setDefaultTopic("siSampleTopic");
return messageHandler;
}
// consumer
#Bean
public IntegrationFlow mqttInFlow() {
return IntegrationFlows.from(mqttInbound())
.transform(p -> p + ", received from MQTT")
.handle(logger())
.get();
}
private LoggingHandler logger() {
LoggingHandler loggingHandler = new LoggingHandler("INFO");
loggingHandler.setLoggerName("siSample");
return loggingHandler;
}
#Bean
public MessageProducerSupport mqttInbound() {
MqttPahoMessageDrivenChannelAdapter adapter = new MqttPahoMessageDrivenChannelAdapter("siSampleConsumer",
mqttClientFactory(), "siSampleTopic");
adapter.setCompletionTimeout(5000);
adapter.setConverter(new DefaultPahoMessageConverter());
adapter.setQos(1);
return adapter;
}