If you make it exclusive the rest of the consumers are "on standby" so if the primary fails another one is set as primary and starts receiving. You can define a queue as exclusive to make sure that all the messages are always sent to the same consumer, even if you have more than one connected to it. there is a fix, which will go by 4.4.2 ems versionĭifference between Exclusive and Non Exclusive Queues
this life span is immediate, but there is a hidden danger with these queues, as these might turn into orphan queues (please read other articles). Temporary Queue means, created by receiver to submit the response to EMS server or Sender to get the messages. I hope you know the definition for Queue which can static, dynamic or temporary.ĭynamic Represents, which will be created by receiver/sender application at run time, life span is limited, as long as there is messages or receivers, it will stay in server, if not it deletes. Which means you physically create this queue. What is the Relationship between Temporary queue, queue, destination.Ī Destination can be a Queue or Topic, which typically says static. Many-to-many messaging Topic publish-subscribe model One-to-many messaging Topic publish-subscribe One-to-one messaging Queue point-to-point The messaging model as listed below will dictate when to use a queue or a topic: The second is publish-subscribe messaging, in which a message is sent by one or more publishers and received by one or more subscribers. The first is point-to-point messaging, in which a message is sent by one publisher (sender) and received by one subscriber (receiver). When determining when to use queues versus topics consider the two fundamental messaging mechanisms. The servers are responsible for providing the quality-of-services to JMS and responsible for implementing all the components not addressed by JMS Specification.
Messages are forwarded to a JMS infrastructure that is composed of one or more JMS servers. Regardless whether queues or topics are used, the messages are not sent directly peer-to-peer. Topics make use of the new publish-and-subscribe messaging model. Queues are based on a point-to-point messaging model. There are two major models for messaging supported by JMS: queues and topics. Dynamic-created by ems server on the fly. In how many ways can a destination be created?ī. Each message can be taken by any number of consumers (radio). Used for load balancing.Īny number of publishers and subscribers can exist. Non-exclusive: where any number of consumers can exist.
At any time and situation each message is taken by only one consumer.Įxclusive: only the first consumer who picks up the first message can take the rest of the messages (used if u wants only one consumer). Any number of producers and consumers can exist. What are the destinations in EMS/JMS and their differences? What are the messaging models supported by JMS? Security: SSL connectivity, view only mode.What are the different modes of installation in Ems? Logging: Server statistics may be logged automatically when warning or error limits are breached. JMS Message Management: It will handle operations like purging messages, copy messages from a queue to another queue on a different server.Ĭharting: Server statistics may be charted in real time, data may be saved to CSV files for export to other tools such as Excel. Request and reply messages can be correlated to provide service response times JMS Message Monitoring: Messages may be monitored (snooped) as they pass trough the server. JMS support: Messages may be sent/received, queues may be browsed and message contents inspected. Server Management: Including, general server configuration,JMS destinations, JNDI factories, users/groups, permissions,bridges, routes etc Server generated events are also captured. Server Monitoring: Server state and main statistics are automatically updated, warning and error limits may be configured. Gems provides the following main features: Gems is a graphical user interface utility for TIBCO Enterprise Message Service (EMS).It can be used by JMS developers as a general purpose test debugging tool and by administrative support staff as a management and monitoring tool.
0 kommentar(er)
