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First, describe ANGULAR4 There is a very important method, called description (subscribe); First look at an example: Getstudytime (userId) { this.trainService.findStudyTime (userId) . Subscribe (result=>{ This.trainlist=result }) } Here, we define a method: Getstudytime (), is to acquire learning time;In normal terms, this.trainService.findStudyTime

Redis implements publishing and subscription functionality through commands such as PUBLISH, SUBSCRIBE, and Psubscribe.These commands are widely used to build instant messaging applications such as network chat rooms (chatroom) and live broadcasts, real-time reminders, and so on.This article is to deepen our understanding of Redis by analyzing the PUBSUB.C files in the Redis source code to understand the underlying implementation of the publish and

0. PrefaceIn the last few sections of the protocol analysis, the request to send the connection was using the Eclipse Paho mqtt tool, so this time I changed the code to send the Subscribe MQTT message, please note that the following code is based on the Eclipse Paho Java API code, before running the following code, please download the Eclipse Paho Java Library, which is: https://www.eclipse.org/paho/clients/java/. Let's get down to the chase. 1. Prepa

Since the first version of EASYNETQ, it has been able to publish/subscribe to a specific type of message. Bus. Subscribe However, during the run, how do you find the message type. For example: You may have some systems that load external plug-ins and want to be able to subscribe to their own message types. EASYNETQ provides Non-generic publishing and subscriptio

Redis Advanced Apps-Publishing and subscriptionsOne, publish and subscribe (pub/sub) functionSecond, publish and subscribe (PUB/SUB) mechanismIii. implementation of Redis Publishing and subscription (PUB/SUB)one, publish and subscribe (pub/sub) functionThe Pub/sub function (Meanspublish, Subscribe) is the publish and

Redis provides a set of commands that enable developers to implement the Publish/Subscribe mode. Publish/Subscribe enables inter-process messaging, which works like this:The Publish/Subscribe mode contains two roles, publisher and Subscriber, respectively. Subscribers can subscribe to one or more channels (channel), an

The prototype of the Publish/subscribe pattern is this: There are two classes of principals, producers and consumers, and the producer puts the tasks that need to be processed into the task queue, while the consumer continuously reads the tasks from the task queue and executes them. Producers and consumers only need to define the format of the task queue in advance, and neither side needs to know the details of the other's implementation. Since both p

What is RSS news RSS refers to the technology of information aggregation. A large number of Web sites offer RSS based news subscriptions, so you can quickly learn about what's recently updated on the site. If you subscribe to a website's RSS feed, you can get the latest content in your subscription folder in time. 　　Do I need to subscribe to RSS news If you visit a website frequently and want to get to

A publish Subscription (PUB/SUB) is a message communication pattern that is primarily designed to decouple the coupling between a message publisher and a message subscriber, which is similar to the observer pattern in design patterns. Pub/sub not only solves the direct code level coupling between publishers and subscribers, but also solves the coupling between the two on the physical deployment. As a pub/sub server, Redis serves as a message routing feature between subscribers and publishers. Su