Queuesession and queuesender relationship trust

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QueueSender queueSender = queueSession. public static final String HARVESTER_QUEUE_NAME = "queue/trust/harvester";. Further I. QueueSender queueSender = queueSession. jogglerwiki.info(queueSession, ( Serializable) payload)); Note: jogglerwiki.info is not on the trusted package list. Figure shows the relationship between connections, sessions, You use the QueueSession to create both the QueueSender and the.

When you create a QueueSession or a TopicSession, you can specify that the session is transactional. The reason transactions are so important for messaging is that you get into situations in which you read a message off a message queue and then try to insert the message in a database.

If the database operation fails, you can't just stick the message back on the queue. If the operation is transactional, however, when the database operation fails, your message stays in the queue.

Transactions can also ensure that the messaging system delivers the messages in the order you send them. Next, you use the QueueConnection to create a QueueSession. Next, you create the Queue although you usually look for the queue in the naming service first, in case someone has already created it.

When you create the queue, you must give it a name.

queuesession and queuesender relationship trust

Every queue must have a unique name. After you have a Queue, you're almost ready. All you need is a QueueSender to send messages on the queue and one or more Message objects. You use the QueueSession to create both the QueueSender and the messages. In this case, the program sends "Hello" messages over a message queue. Of course, instead of creating a QueueSender, you create a QueueReceiver.

There are two different ways to receive messages. You can call the receive method, which waits for messages, or you can create a listener object that receives messages when they become available.

Notice that most of the setup is the same as in Listing You tell the QueueReceiver about your message listener and it will automatically let you know when a message comes in. Although JMS allows you to have multiple receivers on a queue, it is up to the individual implementations to decide how to handle multiple receivers. Some might distribute the messages evenly across all receivers, and others might just send all the messages to the first receiver you create.

Note Because sessions are single-threaded, you can only process one message at a time. If you need to process multiple messages concurrently, you must create multiple sessions. Publishing Messages Although the overall concept of publish-subscribe is a bit different from point-to-point messages, the JMS calls for creating a topic and publishing messages are remarkably similar to the calls for sending queue messages.

In fact, if you go through the program in Listing You must also change the createSender call to createPublisher. As with queues, each topic must have a unique name. Unlike queues, in which you only have one receiver, you normally have many subscribers to a topic. You can also have multiple publishers. Your clients will just see more messages than they do if only one copy is running.

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Subscribing to Topics Subscribing to a topic is just as easy as listening on a queue. Again, you can just about convert the program in Listing Let's understand the key factors for better messaging application development.

In any transacted sessions, acknowledgment happens automatically when a transaction is committed and if a transaction is rolled-back, all consumed messages are redelivered. Three possible values as below: A client acknowledges a message.

Here the session to lazy acknowledge the messages. This is to result in the delivery of some duplicate messages in case JMS provider fails, so it should be used only by consumers that can tolerate duplicate messages. There are two ways to handle the persistence level of messages: A message sent with this delivery mode is logged to stable storage when it is sent. If a durable subscription has no active subscriber, the JMS provider retains the messages until they are received by the subscription or until they expire.

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Now let's dive into the various examples in both P2P and Pub-Sub implementations. P2P Implementation The sender producer side follows the steps below: Creating a connection and a session. Sending messages to the queue. The receiver side would then follow the following steps: Receiving the messages from queue.

Publishing messages to the topic. Closes the connection, which automatically closes the session and Topic-Publisher.

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Receiver side below steps would be taken: Creating an instance of the customized listener class and registers it as the message-listener for the TopicSubscriber. Listening for the messages published to the topic.

queuesession and queuesender relationship trust

Closing the connection, to close TopicSubscriber. A queue browser can be used to look at a queue without consuming any messages. QueueBrowser provides enumerators, which can be used to enumerate the messages in a queue.

It is a kind of snapshot so messages are added to the queue while browsing; this will not be available to the queue browser.