pubsub

Pub Send a message to Code In the muduo example, the hub consists of the following parts: The Hub service program is responsible for one-to-many message distribution. It remembers the topics subscribed by each client and only sends messages to specific subscribers. Code see http://code.google.com/p/muduo/source/browse/trunk/examples/hub/hub.cc Pubsub library. To facilitate the compilation of applications using the

Define routes: Either using spring XML or Java DSL. Spring XML: 　　routeBuilder ref="myBuilder" /> //to load the Java DSL routes defined in MyRouteBuilder class bean id="myBuilder" class="org.apache.camel.spring.example.test1.MyRouteBuilder"/> Java DSL: Extends routebuilder, implement the abstract method configure (). @ OverridePublic void configure () throws exception { 　　Endpoint orderupdates = endpoint ("pubsub: // Batman-order-Updates ");Fro

1.0 prerequisites Objective: To have a conceptual understanding of what a memory-type database is .? Read the following five blog posts about the redis series. This ID will be added one after another. This ID redis Series 1. 0: first, this is your official redis Website: Http://www.redis.cn/ 1.1 you need to download, install, and configure redis successfully. For more information about the process, see another blog post on this ID: Redis series-2 [installation and configuration] 1.2 If you

If you happen to be studying the instant messaging and Location Awareness of Android, this article will surely make you feel excited. You are welcome to discuss and provide various solutions! Address: http://www.cnblogs.com/charley_yang/archive/2011/03/27/1997058.html Location Awareness Service Based on instant messaging and LBS technology (I): Proposing Problems and Solutions (Internet address) In the first article, we raised the need to allow a and B to immediately obtain the exact location

The Acl.config file defines the permissions that can be subscribed to $sys topics .{Allow, {user, ' dashboard '}, subscribe, ["$SYS/#"]}. {Allow, {ipaddr, ' 127.0.0.1 '}, PubSub, ["$SYS/#", "#"]}.%%%{deny, all, subscribe, ["$SYS/#", {eq, "#"}]}. {Allow, all}.The third line of the Acl.config file is by default preventing clients from subscribing to $sys/#主题. We'll comment it out. Open a client and subscribe to the $sys/#主题 with the following message:Mo

during use, or if the connection to master fails, we can still get from slave The node obtains the subscribed message for better robustness. In addition, because the data is not written to disk, this method has an advantage in performance.The signal in the above method is broadcast, all processes in wait are signaled, if the signal is to be set to unicast and only one of them is allowed to receive the signal, it can be implemented by agreeing the channel name pattern, for example:Channel name =

I. Review Before sharing this project, let's review the previous three articles.Article: Location Awareness Service Based on instant messaging and LBS technology (I): Proposing Problems and Solutions (Internet address) In the first article, we raised the need to allow a and B to immediately obtain the exact location of each other in different places. Then we discussed the solution to solve this problem. That is, we abandoned the round robin (pooling) method to update data on different clie

I. Review Before sharing this project, let's review the previous three articles: Location Awareness Service Based on instant messaging and LBS technology (I): Proposing Problems and Solutions (Internet address) In the first article, we raised the need to allow a and B to immediately obtain the exact location of each other in different places. Then we discussed the solution to solve this problem. That is, we abandoned the round robin (pooling) method to update data on different clients, the reaso

server writes the affected results to the client buffer instead of sending them directly to the client. After the server writes the result to the client buffer, it continues to process other client requests. This asynchronous processing method prevents the redis server from blocking the processing of other requests due to network reasons. In the previous article, replication buffer is also one of client buffer. 1) "client-output-buffer-limit"2) "normal 0 0 0 slave 268435456 67108864 60

sets, where the number of a given key must be specified with the Numkeys parameter and the set (result set) is stored in the new collection Zinterstore Computes the intersection of one or more ordered sets given, where the number of a given key must be specified with the Numkeys parameter and the intersection (result set) is stored in the new collection Zscan Incremental iterations Seven, Pub/subPub/sub Command Quick check: Command

slave nodes, so that we can receive the publisher's message at the same time, even if master fails during use, or if the connection to master fails, we can still get from slave The node obtains the subscribed message for better robustness. In addition, because the data is not written to disk, this method has an advantage in performance.The signal in the above method is broadcast, all processes in wait are signaled, if the signal is to be set to unicast and only one of them is allowed to receive

sets, where the number of a given key must be specified with the Numkeys parameter and the set (result set) is stored in the new collection Zinterstore Computes the intersection of one or more ordered sets given, where the number of a given key must be specified with the Numkeys parameter and the intersection (result set) is stored in the new collection Zscan Incremental iterations Seven, Pub/subPub/sub Command Quick check: Command