弄技术要弄通-公司reis的pub/sub怎么使用的呢？

Pub/Sub in Redis using PHP

Posted on November 14, 2011by xmeng

I would like to put an example together about the pub/sub using php in Redis; there is only API documentation available in phpredis, the PHP client I am using (http://redis.io/clients).

0. Setup
First setup a Redis Server. I set up a Redis server in my local box using port 6378 (myredisserver.test.com:6378).

1. Publish: push a message to a channel.
This part is relatively easy. The following is a php script “publish.php“.

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<?php     //publish.php    $redis = new Redis();    $redis->pconnect('myredisserver.test.com',6378);   $redis->publish('chan-1', 'hello, world!'); // send message to channel 1.   $redis->publish('chan-2', 'hello, world2!'); // send message to channel 2.     print "\n";   $redis->close();   ?>

1.5 Checkpoint: Monitor in Redis server.
Let’s take a break now and see what will happen if we run the script “publish.php” from a client side.
Because I use a non default port, “-p” option is used with “redis-cli” command.
Open a new terminal at Redis Server, and issue “MONITOR” command in redis “console”:

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%redis-cli -p 6378 redis 127.0.0.1:6378> MONITOR OK 1321312790.866271 "MONITOR" 1321312792.221599 "PING" 1321312796.330376 "PUBLISH" "chan-1" "hello, world!"      # after run "publish.php" 1321312796.330482 "PUBLISH" "chan-2" "hello, world2!"     # after run "publish.php"

2. Subscribe: Listen to a channel (or some channels).
Here is the complete php script “subscribe.php” after I did some debugging. Thanks to the info here: https://github.com/nicolasff/phpredis/issues/36.

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<?php   //subscribe.php   function f($redis, $chan, $msg) {     switch($chan) {         case 'chan-1':             print "get $msg from $chan\n";             break;         case 'chan-2':             print "get $msg FROM $chan\n";             break;         case 'chan-3':             break;     } }   ini_set('default_socket_timeout', -1);   $redis = new Redis(); $redis->pconnect('myredisserver.test.com',6378);   $redis->subscribe(array('chan-1', 'chan-2', 'chan-3'), 'f'); print "\n";   ?>

2.5
1) run script “subscribe.php“:

1	%php subscribe.php

of course, nothing happens.

2) In another terminal window, run script “publish.php” twice, and come back to have a look!

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%php subscribe.php get hello, world! from chan-1         #newly displayed get hello, world2! FROM chan-2        #newly displayed get hello, world! from chan-1         #newly displayed get hello, world2! FROM chan-2        #newly displayed

3. Breakpoint: Revisit the MINTOR window in Redis Server:

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%redis-cli -p 6378 redis 127.0.0.1:6378> MONITOR OK 1321313546.882528 "MONITOR" 1321313552.848569 "PING" 1321313553.458541 "SUBSCRIBE" "chan-1" "chan-2" "chan-3" 1321313556.223800 "PUBLISH" "chan-1" "hello, world!" 1321313556.223862 "PUBLISH" "chan-2" "hello, world2!" 1321313557.597914 "PUBLISH" "chan-1" "hello, world!" 1321313557.598061 "PUBLISH" "chan-2" "hello, world2!" 1321313562.851878 "PING"

4. Test with multiple publishers and multiple subscribers!

Reference: http://robots.thoughtbot.com/post/6325247416/redis-pub-sub-how-does-it-work