php连接zookeeper实例
内容导读
互联网集市收集整理的这篇技术教程文章主要介绍了php连接zookeeper实例，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含6086字，纯文字阅读大概需要9分钟。
内容图文
1、安装成功zookeeper后，在zookeeper 的bin目录下有启动相应的启动脚本 启动Server
./zkServer.sh start
启动client：(*注：cli需要安装java）
zkCli.sh
2、PHP实例：
<?php
class ZookeeperDemo extends Zookeeper {
public function watcher( $i, $type, $key ) {
echo "Insider Watcher\n" ;
// Watcher gets consumed so we need to set a new one
$this->get( '/test' , array ($this, 'watcher' ) );
}
}
$zoo = new ZookeeperDemo( '127.0.0.1:2181' );
$zoo->get( '/test' , array ($zoo, 'watcher' ) );
while ( true ) {
echo '.' ;
sleep(2);
}
leader与worker任务的分配：
class Worker extends Zookeeper {
const CONTAINER = '/cluster' ;
protected $acl = array (
array (
'perms' => Zookeeper:: PERM_ALL ,
'scheme' => 'world' ,
'id' => 'anyone' ) );
private $isLeader = false ;
private $znode ;
public function __construct( $host = '' , $watcher_cb = null , $recv_timeout = 10000 ) {
parent :: __construct( $host, $watcher_cb, $recv_timeout );
}
public function register() {
if ( ! $this->exists( self :: CONTAINER ) ) {
$this->create( self :: CONTAINER , null , $this-> acl );
}
$this->znode = $this->create( self ::CONTAINER . '/w-' ,
null ,
$this->acl,
Zookeeper:: EPHEMERAL | Zookeeper::SEQUENCE );
$this-> znode = str_replace( self :: CONTAINER . '/' , '' , $this-> znode );
printf( "I'm registred as: %s\n" , $this-> znode );
$watching = $this->watchPrevious();
if ( $watching == $this-> znode ) {
printf( "Nobody here, I'm the leader\n" );
$this->setLeader( true );
}
else {
printf( "I'm watching %s\n" , $watching );
}
}
public function watchPrevious() {
$workers = $this->getChildren( self :: CONTAINER );
sort( $workers );
$size = sizeof( $workers );
for ( $i = 0 ; $i < $size ; $i++ ) {
if ( $this-> znode == $workers[ $i ] ) {
if ( $i > 0 ) {
$this->get( self :: CONTAINER . '/' . $workers[ $i - 1 ], array ( $this, 'watchNode' ) );
return $workers[ $i - 1 ];
}
return $workers[ $i ];
}
}
throw new Exception( sprintf( "Something went very wrong! I can't find myself: %s/%s" ,
self :: CONTAINER ,
$this-> znode ) );
}
public function watchNode( $i, $type, $name ) {
$watching = $this->watchPrevious();
if ( $watching == $this-> znode ) {
printf( "I'm the new leader!\n" );
$this->setLeader( true );
}
else {
printf( "Now I'm watching %s\n" , $watching );
}
}
public function isLeader() {
return $this-> isLeader ;
}
public function setLeader($flag) {
$this-> isLeader = $flag;
}
public function run() {
$this->register();
while ( true ) {
if ( $this->isLeader() ) {
$this->doLeaderJob();
}
else {
$this->doWorkerJob();
}
sleep( 2 );
}
}
public function doLeaderJob() {
echo "Leading\n" ;
}
public function doWorkerJob() {
echo "Working\n" ;
}
}
$worker = new Worker( '127.0.0.1:2181' );
$worker->run();
可以启动3个php进程，查看脚本的运行。进程1：
[root@localhost zookeeper]# php -f worker.php
I'm registred as: w-0000000010
Nobody here, I'm the leader
Leading
进程2：
[daniel.luo@localhost zookeeper]$ php -f worker.php
I'm registred as: w-0000000011
I'm watching w-0000000010
Working
进程3：
[daniel.luo@localhost zookeeper]$ php -f worker.php
I'm registred as: w-0000000012
I'm watching w-0000000011
Working
ctrl + c 关闭leader进程后，会发现进程2与3会选举出新的leader
内容总结
以上是互联网集市为您收集整理的php连接zookeeper实例全部内容，希望文章能够帮你解决php连接zookeeper实例所遇到的程序开发问题。 如果觉得互联网集市技术教程内容还不错，欢迎将互联网集市网站推荐给程序员好友。
内容备注
版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 gblab@vip.qq.com 举报，一经查实，本站将立刻删除。
内容手机端
扫描二维码推送至手机访问。