subscriber booster

string $eventName The event to listen on + * @param callable $listener the listener A * @param int $priority The higher this value, the earlier an event the * Listener'll is triggered in the chain (defaults to 0) + */ - Public functionAddListener ($eventName,$listener,$priority= 0); $ $ /** - * Adds an event subscriber. - * the * The Subscriber is asked-the events he is - * Interested i

: Select publisher, subscriber From MSsubscriber_info The above query lists the comparison between "publish" and "subscribe", but in fact it does not play a role in troubleshooting, because the subscription information may have been deleted from Mssubscriber_info, you cannot find out which 'subscriber' is making such invalid requests. what we can do is to find out the potential subscribers by memory... Find

Redis provides us with the Publish/subscribe (Publish/subscribe) feature. We can subscribe a channel (a subscription), and Redis notifies us when someone publish a message on the channel so we can get a message from someone else.As a Redis client for Java, Jedis provides an interface for Publish/subscribe. This article describes how to use Jedis to implement Publish/subscribe for Redis.Define aSubscriberClassJedis defines an abstract class, in which the JedisPubSub callback method of the publish

is called Subscriber . We follow a unified literal translation called "publisher" and "subscriber".The question is, what if the publisher sends the data at a different speed than the Subscriber is dealing with the data? Subscribers are fast, and that's fine, but if the processing speed doesn't keep up with the speed at which the data is emitted, it's like this:I

a good way to hide actual deployment mechanisms (like DataSource). 2.2 Publisher-Subscriber (Publisher-subscriber) modeOnce the message channel needs to support multiple consumers, it is possible to face the choice of two models: Pull model and push model. Pull model is initiated by the consumer of the message, the initiative is held in the hands of consumers, it will be based on their own situation t

consumed or timed out. The characteristics of peer-to Only one consumer per message (Consumer) (that is, once consumed, the message is no longer in the message queue) There is no dependency on time between the sender and the receiver, that is, when the sender sends the message, regardless of whether the recipient is running, it does not affect the message being sent to the queue The recipient needs to answer the queue successfully after receiving th

Peer-to-peer Mode Peer-to-peer mode includes three roles: Message Queuing (queue), sender (Sender), receiver (Receiver). Each message is sent to a specific queue, and the receiver gets the message from the queue. Queues keep messages until they are consumed or timed out. The characteristics of Peer-to-peer Each message has only one consumer (Consumer) (that is, once consumed, the message is no longer in the message queue) There is no time dependency between the sender and the receiver, meanin

the execution process by starting the local MQ service. We can find that messages are consumed only once, and the JMS provider must ensure that a message is not consumed repeatedly, and certainly not lost. In PTP, after we establish a queue, if no consumer is connected to the queue, messages sent by the message producer will be blocked in the queue until consumers consume it. If the consumer fails, no longer connected to the queue, the message will be saved in the queue, waiting for the next

(); This.num=num; } Public Queuemessagelistener () { super (); } public void OnMessage (Message message) { System.out.println (message.tostring () +num); } After we have installed APACHEMQ, we can test the execution of these classes and observe the execution process by starting the local MQ service. We can find that messages are consumed only once, and the JMS provider must ensure that a message is not consumed repeatedly, and certa

Tags: style blog http io os using ar strong file"Article Summary"A recent project to get some data that exists on other servers, it is implemented in a way that is pushed by other "servers" to our servers for security reasons. Our server is using SQL Server R2, the other "servers" are using SQL Server 2000, also run on Windows XP, the whole process encountered a number of problems, but also refer to some of the documents, the final cost of a lot of things to be done."Article index" To c

), primary-standby means that a server is in a certain kind of business activation state (that is, the active state), The other server is in the standby state of the business (that is, the standby state). The dual-host approach means that two different services are in the primary standby state (that is, the Active-standby and Standby-active states) on two servers respectively.We are mainly using the SQL Server 2005 subscription replication feature to implement a dual-machine hot standby, as show

is called a publisher. Publishers monitor all changes to the article and notify the reseller of these changes.Reseller (distributor)Resellers are both tracking all subscribers and tracking changes for all publishers, while ensuring that any change is known to each Subscriber. The vast majority of changes are traced to the distribution server. Although a reseller can act as a standalone database instance, the distributor typically runs on the publishe

on the design of the event member. This chapter resolves the design of event providers and Subscriber types by designing a scenario that triggers events when an e-mail arrives. The case comes from the "CLR Via C #" book. design of event provider types I. Define types to accommodate all additional information that needs to be sent to event subscribers Goal: Define a type to pass information to the subscribe