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yac

C#源码

1.0.0

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yac-另一个缓存

YAC是用于PHP的共享和无锁的内存用户数据缓存。

它可用于替换APC或本地备忘录。

要求

PHP 7 +

安装

 $/path/to/phpize
$./configure --with-php-config=/path/to/php-config
$make && make install

笔记

YAC是一个无锁的缓存，您应该尝试避免或减少多个过程的概率设置一个相同的密钥
YAC使用部分CRC，最好重新安排您的缓存内容，将最重要（可变的）字节放在头部或尾巴上

限制

缓存密钥不能超过48（yac_max_key_len）字节
缓存值不能超过64m（yac_max_value_raw_len）字节
压缩后的缓存值不能超过1M（yac_max_value_compressed_len）字节

INIS

 yac.enable = 1

yac.keys_memory_size = 4M ; 4M can get 30K key slots, 32M can get 100K key slots

yac.values_memory_size = 64M

yac.compress_threshold = -1

yac.enable_cli = 0 ; whether enable yac with cli, default 0

yac.serializer = php ; since yac 2.2.0 , specific seralizer yac used
                       could be json(--enable-json), msgpack(--enable-msgpack) or igbinary(--enable-igbinary)

常数

 YAC_VERSION

YAC_MAX_KEY_LEN = 48 ; if your key is longer than this, maybe you can use md5 result as the key

YAC_MAX_VALUE_RAW_LEN = 64M

YAC_MAX_VALUE_COMPRESSED_LEN = 1M

YAC_SERIALIZER_PHP = 0   ; since yac-2.2.0

YAC_SERIALIZER_JSON = 1  ; since yac-2.2.0

YAC_SERIALIZER_MSGPACK = 2 ; since yac-2.2.0

YAC_SERIALIZER_IGBINARY = 3 ; since yac-2.2.0

YAC_SERIALIZER  ; serializer according to yac.serializer, default is YAC_SERIALIZER_PHP

方法

yac :: __构造

   Yac:: __construct ([string $ prefix = "" ])

YAC的构造函数，您可以指定一个前缀，该前缀将在执行/get/delete时将其预定到任何键

 <?php
   $ yac = new Yac ( " myproduct_ " );
?>

yac ::设定

   Yac:: set ( $ key , $ value [, $ ttl = 0 ])
   Yac:: set (array $ kvs [, $ ttl = 0 ])

将一个值存储到YAC缓存中，键是缓存唯一的，因此使用相同键存储第二个值将覆盖原始值。

成功返回真实，返回错误时错误（就像没有内存一样，无法获得CAS写入）

 <?php
$ yac = new Yac ();
$ yac -> set ( " foo " , " bar " );
$ yac -> set (
    array (
        " dummy " => " foo " ,
        " dummy2 " => " foo " ,
        )
    );
?>

笔记：

作为YAC 2.1，如果CAS竞争失败，商店可能会失败，您可能需要做：

 while (!( $ yac -> set ( " important " , " value " )));

如果您需要正确存储该值。

YAC :: GET

   Yac::get(array|string $key[, &$cas = NULL])

从缓存中获取存储的变量。如果传递数组，则每个元素被获取并返回。

返回成功的值，返回错误时错误（就像没有内存一样，无法获得CAS写入）

 <?php
$ yac = new Yac ();
$ yac -> set ( " foo " , " bar " );
$ yac -> set (
    array (
        " dummy " => " foo " ,
        " dummy2 " => " foo " ,
        )
    );
$ yac -> get ( " dummy " );
$ yac -> get ( array ( " dummy " , " dummy2 " ));
?>

yac ::删除

   Yac::delete(array|string $keys[, $delay=0])

从缓存中删除存储的变量。如果指定延迟，则该值将在$延迟秒后删除。

yac ::齐平

   Yac::flush()

立即使所有现有项目无效。它实际上并没有免费的任何资源，它仅将所有项目标记为无效。

yac ::信息

   Yac::info(void)

获取缓存信息

 <?php
  . . . .
  var_dump ( $ yac -> info ());
  /* will return an array like :
  array ( 11) {
      [ " memory_size "]=> int(541065216)
      [ "slots_memory_size" ] => int ( 4194304 )
      [ "values_memory_size" ] => int ( 536870912 )
      [ "segment_size" ] => int ( 4194304 )
      [ "segment_num" ] => int ( 128 )
      [ "miss" ] => int ( 0 )
      [ "hits" ] => int ( 955 )
      [ "fails" ] => int ( 0 )
      [ "kicks" ] => int ( 0 )
      [ "slots_size" ] => int ( 32768 )
      [ "slots_used" ] => int ( 955 )
  }
  */