(Conversion) activemq message feature: Advisory message (notification message)

Simply put, it implements tracking and notification of various operations on the activemq broker.

 

With this function, you can know the broker in real time.

 

1. Creates or destroys a connection,
2. Added or deleted survivors or consumers,
3. Added or deleted topics or queues,
4. Messages are sent and received,
5. When are there slow consumers,
6. When will there be a producer?
7. When And when messages are discarded
8. When is the broker added to the cluster (Master/Slave or network connection)

 

This mechanism is an important supplement of activemq to the JMS protocol, and is also part of the manageability of activemq implemented based on JMS. Basic settings for coordination and interoperability among multiple activemq instances.

 

Examples and precautions

Simple to use, complete JMS method, example:

 

 

...    Destination advisoryDestination = AdvisorySupport.getProducerAdvisoryTopic(destination)    MessageConsumer consumer = session.createConsumer(advisoryDestination);    consumer.setMessageListener(this);....public void onMessage(Message msg){    if (msg instanceof ActiveMQMessage){        try {             ActiveMQMessage aMsg =  (ActiveMQMessage)msg;             ProducerInfo prod = (ProducerInfo) aMsg.getDataStructure();        } catch (JMSException e) {            log.error("Failed to process message: " + msg);        }    }}

The data structure of the received message further obtains the relevant operation information.

 

In addition, the advisory message first returns all existing data, such as all existing connections or queue information, and then notifies you of new and disconnected connections in real time, newly added or deleted queues...

The data structure of activemq. Advisory. queue is destinationinfo. The list of all existing queues on the broker is obtained first.
If there is another add or remove queue operation, get the notification, operationtype = 0 is add, and 1 is remove
When it is a topic, the advisory topic is automatically filtered out.

The activemq. Advisory. Producer. Queue data structure is producerinfo, which contains the producer parameter information.
Activemq. Advisory. Consumer. Queue data structure is consumerinfo, which contains the consumer parameter information
You need to use this prefix to listen to the required queue, such as KK. ADT, you should write
Topic topic = new activemqtopic ("activemq. Advisory. Consumer. queue. KK. ADT ");
Listen to all queues
Topic topic = new activemqtopic ("activemq. Advisory. Consumer. Queue...> ");
When the producer or consumer is disconnected, the data structure is removeinfo.
The topic listening is similar.

The persistent subscriber goes online with consumerinfo, which contains the clientid and consumerid. The removeinfo contains the consumerid, which corresponds to the consumerid when going online.

Activemq has some built-in tools. Based on the queue name you need to listen to, the advisory name is automatically spelled out:
For example, advisorysupport. getproduceradvisorytopic (New activemqtopic ("KK. ADT "));

Notifications of messages received or delivered by the broker are disabled by default.
You need to set the corresponding switch on the policy. The data structure of advisory related to message processing is the message itself.

Notifications related to client connection are enabled by default.

Advisory topics	Description	Properties	Data Structure
Activemq. Advisory. Connection	Connection start & stop messages
Activemq. Advisory. Producer. Queue	Producer start & stop messages on a queue	String = 'producercount'-the number of producers	Producerinfo
Activemq. Advisory. Producer. Topic	Producer start & stop messages on a topic	String = 'producercount'-the number of producers	Producerinfo
Activemq. Advisory. Consumer. Queue	Consumer start & stop messages on a queue	String = 'sumercount'-the number of consumers	Consumerinfo
Activemq. Advisory. Consumer. Topic	Consumer start & stop messages on a topic	String = 'sumercount'-the number of consumers	Consumerinfo

 

The notification message queue is enabled by default. You must manually configure the pilocy option to enable message-related services.

Advisory topics	Description	Properties	Data Structure	Default	Policyentry Property
Activemq. Advisory. Queue	Queue create & destroy	Null	Null	True	None
Activemq. Advisory. Topic	Topic Create & destroy	Null	Null	True	None
Activemq. Advisory. tempqueue	Temporary queue create & destroy	Null	Null	True	None
Activemq. Advisory. temptopic	Temporary topic Create & destroy	Null	Null	True	None
Activemq. Advisory. Expired. Queue	Expired messages on a queue	String = 'nalnalmessageid'-the expired ID	Message	True	None
Activemq. Advisory. Expired. Topic	Expired messages on a topic	String = 'nalnalmessageid'-the expired ID	Message	True	None
Activemq. Advisory. noconsumer. Queue	No consumer is available to process messages being sent on a queue	Null	Message	False	Sendadvisoryifnoconsumers
Activemq. Advisory. noconsumer. Topic	No consumer is available to process messages being sent on a topic	Null	Message	False	Sendadvisoryifnoconsumers

Message Processing and performance related to the new version 5.2 must be manually started.

Advisory topics	Description	Properties	Data Structure	Default	Policyentry Property
Activemq. Advisory. slowconsumer. Queue	Slow queue consumer	String = 'consumer id'-the consumer ID	Consumerinfo	False	Advisoryforslowconsumers
Activemq. Advisory. slowconsumer. Topic	Slow topic consumer	String = 'consumer id'-the consumer ID	Consumerinfo	False	Advisoryforslowconsumers
Activemq. Advisory. fastproducer. Queue	Fast queue producer	String = 'producerid'-the producer ID	Producerinfo	False	Advisdoryforfastproducers
Activemq. Advisory. fastproducer. Topic	Fast topic producer	String = 'consumerid'-the producer ID	Producerinfo	False	Advisdoryforfastproducers
Activemq. Advisory. messagediscarded. Queue	Message discarded	String = 'nalnalmessageid'-the discarded ID	Message	False	Advisoryfordiscardingmessages
Activemq. Advisory. messagediscarded. Topic	Message discarded	String = 'nalnalmessageid'-the discarded ID	Message	False	Advisoryfordiscardingmessages
Activemq. Advisory. messagedelivered. Queue	Message delivered to the broker	String = 'nalnalmessageid'-the delivered ID	Message	False	Advisoryfordelivery
Activemq. Advisory. messagedelivered. Topic	Message delivered to the broker	String = 'nalnalmessageid'-the delivered ID	Message	False	Advisoryfordelivery
Activemq. Advisory. messageconsumed. Queue	Message consumed by a client	String = 'nalnalmessageid'-the delivered ID	Message	False	Advisoryforconsumed
Activemq. Advisory. messageconsumed. Topic	Message consumed by a client	String = 'nalnalmessageid'-the delivered ID	Message	False	Advisoryforconsumed
Activemq. Advisory. Full	A usage resource is at its limit	String = 'usagename'-the name of usage Resource	Null	False	Advisorywhenfull
Activemq. Advisory. masterbroker	A broker is now the master in a Master/Slave Configuration	Null	Null	True	None

Notifications for the newly added dlq from version 5.4

Advisory topics	Description	Properties	Data Structure	Default	Policyentry Property
Activemq. Advisory. messagedlqd. Queue	Message sent to dlq	String = 'nalnalmessageid'-the delivered ID	Message	Always on	Advisoryforconsumed
Activemq. Advisory. messagedlqd. Topic	Message sent to dlq	String = 'nalnalmessageid'-the delivered ID	Message	Always on	Advisoryforconsumed

Notification Message for the newly added network connection cluster from Version 5.5

Advisory topics	Description	Properties	Data Structure	Default
Activemq. Advisory. networkbridge	Network Bridge being stopped or started	Boolean = "started"-true if Bridge is started, false if it is stopped Boolean = "createdbyduplex"-true if the bridge is created by remote network Connector	Brokerinfo-provides data of the remote Broker	Always on

Example of enabling the notification message switch

<destinationPolicy>   <policyMap><policyEntries>       <policyEntry topic=">" advisoryForConsumed="true" />   </policyEntries></policyMap></destinationPolicy>

 

In addition, there is a general switch for notification messages on the broker. After setting false, all advisory will be unavailable:

 

<Broker advisorysupport = "false">...
From: http://blog.csdn.net/kimmking/article/details/8443679

 

(Conversion) activemq message feature: Advisory message (notification message)