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関数・クラス解説

Zookeeper::get

version:PECL zookeeper >= 0.1.0 (公式)

Gets the data associated with a node synchronously

公式リファレンス

書式

public Zookeeper::get ( string $path [, callable $watcher_cb = NULL [, array &$stat = NULL [, int $max_size = 0 ]]] ) : string

パラメータ

path: The name of the node. Expressed as a file name with slashes separating ancestors of the node.
watcher_cb: If nonzero, a watch will be set at the server to notify the client if the node changes.
stat: If not NULL, will hold the value of stat for the path on return.
max_size: Max size of the data. If 0 is used, this method will return the whole data.

返値

Returns the data on success, and false on failure.

エラー

This method emits PHP error/warning when parameters count or types are wrong or fail to get value from node. 警告 Since version 0.3.0, this method emits ZookeeperException and it's derivatives.

サンプル

例1 Zookeeper::get() example
  Get value from node.  

$zookeeper = new Zookeeper('locahost:2181');
$path = '/path/to/node';
$value = 'nodevalue';
$zookeeper->set($path, $value);

$r = $zookeeper->get($path);
if ($r)
  echo $r;
else
  echo 'ERR';

 上の例の出力は以下となります。 
nodevalue
 例2 Zookeeper::get() stat example
  Get node stat info.  

$zookeeper = new Zookeeper('localhost:2181');
$path = '/path/to/node';
$stat = [];
$zookeeper->get($path, null, $stat);
var_dump($stat);

 上の例の出力は以下となります。 
array(11) {
  ["czxid"]=>
  float(0)
  ["mzxid"]=>
  float(0)
  ["ctime"]=>
  float(0)
  ["mtime"]=>
  float(0)
  ["version"]=>
  int(0)
  ["cversion"]=>
  int(-2)
  ["aversion"]=>
  int(0)
  ["ephemeralOwner"]=>
  float(0)
  ["dataLength"]=>
  int(0)
  ["numChildren"]=>
  int(2)
  ["pzxid"]=>
  float(0)
}