源码
vendor/laravel/framework/src/Illuminate/Redis/Connections/PhpRedisConnection.php
<?php
namespace Illuminate\Redis\Connections;
use Closure;
use Illuminate\Contracts\Redis\Connection as ConnectionContract;
use Illuminate\Support\Str;
use Redis;
use RedisCluster;
use RedisException;
/**
* @mixin \Redis
*/
class PhpRedisConnection extends Connection implements ConnectionContract
{
/**
* The connection creation callback.
*
* @var callable
*/
protected $connector;
/**
* Create a new PhpRedis connection.
*
* @param \Redis $client
* @param callable $connector
* @return void
*/
public function __construct($client, callable $connector = null)
{
$this->client = $client;
$this->connector = $connector;
}
/**
* Returns the value of the given key.
*
* @param string $key
* @return string|null
*/
public function get($key)
{
$result = $this->command('get', [$key]);
return $result !== false ? $result : null;
}
/**
* Get the values of all the given keys.
*
* @param array $keys
* @return array
*/
public function mget(array $keys)
{
return array_map(function ($value) {
return $value !== false ? $value : null;
}, $this->command('mget', [$keys]));
}
/**
* Determine if the given keys exist.
*
* @param mixed $keys
* @return int
*/
public function exists(...$keys)
{
$keys = collect($keys)->map(function ($key) {
return $this->applyPrefix($key);
})->all();
return $this->executeRaw(array_merge(['exists'], $keys));
}
/**
* Set the string value in argument as value of the key.
*
* @param string $key
* @param mixed $value
* @param string|null $expireResolution
* @param int|null $expireTTL
* @param string|null $flag
* @return bool
*/
public function set($key, $value, $expireResolution = null, $expireTTL = null, $flag = null)
{
return $this->command('set', [
$key,
$value,
$expireResolution ? [$flag, $expireResolution => $expireTTL] : null,
]);
}
/**
* Set the given key if it doesn't exist.
*
* @param string $key
* @param string $value
* @return int
*/
public function setnx($key, $value)
{
return (int) $this->command('setnx', [$key, $value]);
}
/**
* Get the value of the given hash fields.
*
* @param string $key
* @param mixed $dictionary
* @return array
*/
public function hmget($key, ...$dictionary)
{
if (count($dictionary) === 1) {
$dictionary = $dictionary[0];
}
return array_values($this->command('hmget', [$key, $dictionary]));
}
/**
* Set the given hash fields to their respective values.
*
* @param string $key
* @param mixed $dictionary
* @return int
*/
public function hmset($key, ...$dictionary)
{
if (count($dictionary) === 1) {
$dictionary = $dictionary[0];
} else {
$input = collect($dictionary);
$dictionary = $input->nth(2)->combine($input->nth(2, 1))->toArray();
}
return $this->command('hmset', [$key, $dictionary]);
}
/**
* Set the given hash field if it doesn't exist.
*
* @param string $hash
* @param string $key
* @param string $value
* @return int
*/
public function hsetnx($hash, $key, $value)
{
return (int) $this->command('hsetnx', [$hash, $key, $value]);
}
/**
* Removes the first count occurrences of the value element from the list.
*
* @param string $key
* @param int $count
* @param mixed $value
* @return int|false
*/
public function lrem($key, $count, $value)
{
return $this->command('lrem', [$key, $value, $count]);
}
/**
* Removes and returns the first element of the list stored at key.
*
* @param mixed $arguments
* @return array|null
*/
public function blpop(...$arguments)
{
$result = $this->command('blpop', $arguments);
return empty($result) ? null : $result;
}
/**
* Removes and returns the last element of the list stored at key.
*
* @param mixed $arguments
* @return array|null
*/
public function brpop(...$arguments)
{
$result = $this->command('brpop', $arguments);
return empty($result) ? null : $result;
}
/**
* Removes and returns a random element from the set value at key.
*
* @param string $key
* @param int|null $count
* @return mixed|false
*/
public function spop($key, $count = 1)
{
return $this->command('spop', [$key, $count]);
}
/**
* Add one or more members to a sorted set or update its score if it already exists.
*
* @param string $key
* @param mixed $dictionary
* @return int
*/
public function zadd($key, ...$dictionary)
{
if (is_array(end($dictionary))) {
foreach (array_pop($dictionary) as $member => $score) {
$dictionary[] = $score;
$dictionary[] = $member;
}
}
$key = $this->applyPrefix($key);
return $this->executeRaw(array_merge(['zadd', $key], $dictionary));
}
/**
* Return elements with score between $min and $max.
*
* @param string $key
* @param mixed $min
* @param mixed $max
* @param array $options
* @return array
*/
public function zrangebyscore($key, $min, $max, $options = [])
{
if (isset($options['limit'])) {
$options['limit'] = [
$options['limit']['offset'],
$options['limit']['count'],
];
}
return $this->command('zRangeByScore', [$key, $min, $max, $options]);
}
/**
* Return elements with score between $min and $max.
*
* @param string $key
* @param mixed $min
* @param mixed $max
* @param array $options
* @return array
*/
public function zrevrangebyscore($key, $min, $max, $options = [])
{
if (isset($options['limit'])) {
$options['limit'] = [
$options['limit']['offset'],
$options['limit']['count'],
];
}
return $this->command('zRevRangeByScore', [$key, $min, $max, $options]);
}
/**
* Find the intersection between sets and store in a new set.
*
* @param string $output
* @param array $keys
* @param array $options
* @return int
*/
public function zinterstore($output, $keys, $options = [])
{
return $this->command('zinterstore', [$output, $keys,
$options['weights'] ?? null,
$options['aggregate'] ?? 'sum',
]);
}
/**
* Find the union between sets and store in a new set.
*
* @param string $output
* @param array $keys
* @param array $options
* @return int
*/
public function zunionstore($output, $keys, $options = [])
{
return $this->command('zunionstore', [$output, $keys,
$options['weights'] ?? null,
$options['aggregate'] ?? 'sum',
]);
}
/**
* Execute commands in a pipeline.
*
* @param callable|null $callback
* @return \Redis|array
*/
public function pipeline(callable $callback = null)
{
$pipeline = $this->client()->pipeline();
return is_null($callback)
? $pipeline
: tap($pipeline, $callback)->exec();
}
/**
* Execute commands in a transaction.
*
* @param callable|null $callback
* @return \Redis|array
*/
public function transaction(callable $callback = null)
{
$transaction = $this->client()->multi();
return is_null($callback)
? $transaction
: tap($transaction, $callback)->exec();
}
/**
* Evaluate a LUA script serverside, from the SHA1 hash of the script instead of the script itself.
*
* @param string $script
* @param int $numkeys
* @param mixed $arguments
* @return mixed
*/
public function evalsha($script, $numkeys, ...$arguments)
{
return $this->command('evalsha', [
$this->script('load', $script), $arguments, $numkeys,
]);
}
/**
* Evaluate a script and return its result.
*
* @param string $script
* @param int $numberOfKeys
* @param dynamic $arguments
* @return mixed
*/
public function eval($script, $numberOfKeys, ...$arguments)
{
return $this->command('eval', [$script, $arguments, $numberOfKeys]);
}
/**
* Subscribe to a set of given channels for messages.
*
* @param array|string $channels
* @param \Closure $callback
* @return void
*/
public function subscribe($channels, Closure $callback)
{
$this->client->subscribe((array) $channels, function ($redis, $channel, $message) use ($callback) {
$callback($message, $channel);
});
}
/**
* Subscribe to a set of given channels with wildcards.
*
* @param array|string $channels
* @param \Closure $callback
* @return void
*/
public function psubscribe($channels, Closure $callback)
{
$this->client->psubscribe((array) $channels, function ($redis, $pattern, $channel, $message) use ($callback) {
$callback($message, $channel);
});
}
/**
* Subscribe to a set of given channels for messages.
*
* @param array|string $channels
* @param \Closure $callback
* @param string $method
* @return void
*/
public function createSubscription($channels, Closure $callback, $method = 'subscribe')
{
//
}
/**
* Flush the selected Redis database.
*
* @return void
*/
public function flushdb()
{
if (! $this->client instanceof RedisCluster) {
return $this->command('flushdb');
}
foreach ($this->client->_masters() as [$host, $port]) {
tap(new Redis)->connect($host, $port)->flushDb();
}
}
/**
* Execute a raw command.
*
* @param array $parameters
* @return mixed
*/
public function executeRaw(array $parameters)
{
return $this->command('rawCommand', $parameters);
}
/**
* Run a command against the Redis database.
*
* @param string $method
* @param array $parameters
* @return mixed
*/
public function command($method, array $parameters = [])
{
try {
return parent::command($method, $parameters);
} catch (RedisException $e) {
if (Str::contains($e->getMessage(), 'went away')) {
$this->client = $this->connector ? call_user_func($this->connector) : $this->client;
}
throw $e;
}
}
/**
* Disconnects from the Redis instance.
*
* @return void
*/
public function disconnect()
{
$this->client->close();
}
/**
* Apply prefix to the given key if necessary.
*
* @param string $key
* @return string
*/
private function applyPrefix($key)
{
$prefix = (string) $this->client->getOption(Redis::OPT_PREFIX);
return $prefix.$key;
}
/**
* Pass other method calls down to the underlying client.
*
* @param string $method
* @param array $parameters
* @return mixed
*/
public function __call($method, $parameters)
{
return parent::__call(strtolower($method), $parameters);
}
}
所有的方法
//使用autoload加载相关库,这边重点就是为了require $file;
spl_autoload_register(function($class) {
$file = __DIR__ . '/lib/Predis/' . $class . '.php';
if (file_exists($file)) {
require $file;
return true;
}
});
//配置连接的IP、端口、以及相应的数据库
$server = array (
'host' => '127.0.0.1',
'port' => 6379,
'database' => 15
);
$redis = new Client($server);
//普通set/get操作
$redis->set('library', 'predis');
$retval = $redis->get('library');
echo $retval; //显示 'predis'
//setex set一个存储时效
$redis->setex('str', 10, 'bar'); //表示存储有效期为10秒
//setnx/msetnx相当于add操作,不会覆盖已有值
$redis->setnx('foo', 12); //true
$redis->setnx('foo', 34); //false
//getset操作,set的变种,结果返回替换前的值
$redis->getset('foo', 56); //返回34
// incrby/incr/decrby/decr 对值的递增和递减
$redis->incr('foo'); //foo为57
$redis->incrby('foo', 2); //foo为59
//exists检测是否存在某值
$redis->exists('foo'); //true
//del 删除
$redis->del('foo'); //true
//type 类型检测,字符串返回string,列表返回 list,set表返回set/zset,hash表返回hash
$redis->type('foo'); //不存在,返回none
$redis->set('str', 'test');
$redis->type('str'); //字符串，返回string
//append 连接到已存在字符串
$redis->append('str', '_123'); //返回累加后的字符串长度8,此进str为 'test_123'
//setrange 部分替换操作
$redis->setrange('str', 0, 'abc'); //返回3,参数2为0时等同于set操作
$redis->setrange('str', 2, 'cd'); //返回4,表示从第2个字符后替换,这时'str'为'abcd'
//substr 部分获取操作
$redis->substr('str', 0, 2); //表示从第0个起，取到第2个字符，共3个，返回'abc'
//strlen 获取字符串长度
$redis->strlen('str'); //返回4
//setbit/getbit 位存储和获取
$redis->setbit('binary', 31, 1); //表示在第31位存入1,这边可能会有大小端问题?
//不过没关系,getbit 应该不会有问题
$redis->getbit('binary', 31); //返回1
//keys 模糊查找功能,支持*号以及?号(匹配一个字符)
$redis->set('foo1', 123);
$redis->set('foo2', 456);
$redis->keys('foo*'); //返回foo1和foo2的array
$redis->keys('f?o?'); //同上
//randomkey 随机返回一个key
$redis->randomkey(); //可能是返回 'foo1'或者是'foo2'及其它任何一存在redis的key
//rename/renamenx 对key进行改名,所不同的是renamenx不允许改成已存在的key
$redis->rename('str', 'str2'); //把原先命名为'str'的key改成了'str2'
//expire 设置key-value的时效性,ttl 获取剩余有效期,persist 重新设置为永久存储
$redis->expire('foo', 1); //设置有效期为1秒
$redis->ttl('foo'); //返回有效期值1s
$redis->expire('foo'); //取消expire行为
//dbsize 返回redis当前数据库的记录总数
$redis->dbsize();
/*
队列操作
*/
// rpush/rpushx 有序列表操作,从队列后插入元素
// lpush/lpushx 和rpush/rpushx的区别是插入到队列的头部,同上
// 'x'含义是只对已存在的key进行操作
$redis->rpush('fooList', 'bar1'); //返回一个列表的长度1
$redis->lpush('fooList', 'bar0'); //返回一个列表的长度2
$redis->rpushx('fooList', 'bar2'); //返回3,rpushx只对已存在的队列做添加,否则返回0
//llen返回当前列表长度
$redis->llen('fooList'); //3
//lrange 返回队列中一个区间的元素
$redis->lrange('fooList', 0, 1); //返回数组包含第0个至第1个共2个元素
//返回第0个至倒数第一个,相当于返回所有元素,注意redis中很多时候会用到负数,下同
$redis->lrange('fooList', 0,- 1);
//lindex 返回指定顺序位置的list元素
$redis->lindex('fooList', 1); //返回'bar1'
//lset 修改队列中指定位置的value
$redis->lset('fooList', 1, '123'); //修改位置1的元素,返回true
//lrem 删除队列中左起指定数量的字符
$redis->lrem('fooList', 1, '_'); //删除队列中左起(右起使用-1)1个字符'_'(若有)
//lpop/rpop 类似栈结构地弹出(并删除)最左或最右的一个元素
$redis->lpop('fooList'); //'bar0'
$redis->rpop('fooList'); //'bar2'
//ltrim 队列修改，保留左边起若干元素，其余删除
$redis->ltrim('fooList', 0, 1); //保留左边起第0个至第1个元素
//rpoplpush 从一个队列中pop出元素并push到另一个队列
$redis->rpush('list1', 'ab0');
$redis->rpush('list1', 'ab1');
$redis->rpush('list2', 'ab2');
$redis->rpush('list2', 'ab3');
//结果list1 => array('ab0'),list2 => array('ab1','ab2','ab3')
$redis->rpoplpush('list1', 'list2');
//也适用于同一个队列,把最后一个元素移到头部list2 => array('ab3','ab1','ab2')
$redis->rpoplpush('list2', 'list2');
//linsert 在队列的中间指定元素前或后插入元素
$redis->linsert('list2', 'before', 'ab1', '123'); //表示在元素'ab1'之前插入'123'
$redis->linsert('list2', 'after', 'ab1', '456'); //表示在元素'ab1'之后插入'456'
//blpop/brpop 阻塞并等待一个列队不为空时，再pop出最左或最右的一个元素
//brpoplpush 同样是阻塞并等待操作，结果同rpoplpush一样
$redis->blpop('list3', 10); //如果list3为空则一直等待,直到不为空时将第一元素弹出,10秒后超时
/**
set表操作
*/
//sadd 增加元素,返回true,重复返回false
$redis->sadd('set1', 'ab');
$redis->sadd('set1', 'cd');
$redis->sadd('set1', 'ef');
//srem 移除指定元素
$redis->srem('set1', 'cd'); //删除'cd'元素
//spop 弹出首元素
$redis->spop('set1');
//smove 移动当前set表的指定元素到另一个set表
$redis->sadd('set2', '123');
//移动'set1'中的'ab'到'set2',返回true or false
$redis->smove('set1', 'set2', 'ab');
//scard 返回当前set表元素个数
$redis->scard('set2'); //2
//sismember 判断元素是否属于当前表
$redis->sismember('set2', '123'); //true or false
//smembers 返回当前表的所有元素
$redis->smembers('set2'); //array('123','ab');
//sinter/sunion/sdiff 返回两个表中元素的交集/并集/补集
$redis->sadd('set1', 'ab');
$redis->sinter('set2', 'set1'); //返回array('ab')
//sinterstore/sunionstore/sdiffstore 将两个表交集/并集/补集元素copy到第三个表中
$redis->set('foo', 0);
//这边等同于将'set1'的内容copy到'foo'中，并将'foo'转为set表
$redis->sinterstore('foo', 'set1');
//将'set1'和'set2'中相同的元素copy到'foo'表中,覆盖'foo'原有内容
$redis->sinterstore('foo', array('set1', 'set2'));
//srandmember 返回表中一个随机元素
$redis->srandmember('set1');
/**
有序set表操作
*/
//sadd 增加元素,并设置序号,返回true,重复返回false
$redis->zadd('zset1', 1, 'ab');
$redis->zadd('zset1', 2, 'cd');
$redis->zadd('zset1', 3, 'ef');
//zincrby 对指定元素索引值的增减,改变元素排列次序
$redis->zincrby('zset1', 10, 'ab'); //返回11
//zrem 移除指定元素
$redis->zrem('zset1', 'ef'); //true or false
//zrange 按位置次序返回表中指定区间的元素
$redis->zrange('zset1', 0, 1); //返回位置0和1之间(两个)的元素
$redis->zrange('zset1', 0,- 1); //返回位置0和倒数第一个元素之间的元素(相当于所有元素)
//zrevrange 同上,返回表中指定区间的元素,按次序倒排
$redis->zrevrange('zset1', 0,- 1); //元素顺序和zrange相反
//zrangebyscore/zrevrangebyscore 按顺序/降序返回表中指定索引区间的元素
$redis->zadd('zset1', 3, 'ef');
$redis->zadd('zset1', 5, 'gh');
$redis->zrangebyscore('zset1', 2, 9); //返回索引值2-9之间的元素 array('ef','gh')
//参数形式
//返回索引值2-9之间的元素并包含索引值 array(array('ef',3),array('gh',5))
$redis->zrangebyscore('zset1', 2, 9, 'withscores');
// 返回索引值2-9之间的元素,'withscores' => true表示包含索引值;
// 'limit'=>array(1, 2),表示最多返回2条,结果为array(array('ef',3),array('gh',5))
$redis->zrangebyscore('zset1', 2, 9, array('withscores' => true, 'limit' => array(1, 2)));
//zunionstore/zinterstore 将多个表的并集/交集存入另一个表中
//将'zset1','zset2','zset0'的并集存入'zset3'
$redis->zunionstore('zset3', array('zset1', 'zset2', 'zset0'));
//其它参数
//weights参数表示权重，其中表示并集后值大于5的元素排在前，大于0的排在后
$redis->zunionstore('zset3', array('zset1', 'zset2'), array('weights' => array(5, 0)));
//'aggregate' => 'max'或'min'表示并集后相同的元素是取大值或是取小值
$redis->zunionstore('zset3', array('zset1', 'zset2'), array('aggregate' => 'max'));
//zcount 统计一个索引区间的元素个数
$redis->zcount('zset1', 3, 5); //2
//'(3'表示索引值在3-5之间但不含3,同理也可以使用'(5'表示上限为5但不含5
$redis->zcount('zset1', '(3', 5));
//zcard 统计元素个数
$redis->zcard('zset1'); //4
//zscore 查询元素的索引
$redis->zscore('zset1', 'ef'); //3
//zremrangebyscore 删除一个索引区间的元素
$redis->zremrangebyscore('zset1', 0, 2); //删除索引在0-2之间的元素('ab','cd'),返回删除元素个数2
//zrank/zrevrank 返回元素所在表顺序/降序的位置(不是索引)
$redis->zrank('zset1', 'ef'); //返回0,因为它是第一个元素;zrevrank则返回1(最后一个)
//zremrangebyrank 删除表中指定位置区间的元素
$redis->zremrangebyrank('zset1', 0, 10); //删除位置为0-10的元素,返回删除的元素个数2
/**
hash表操作
*/
//hset/hget 存取hash表的数据
$redis->hset('hash1', 'key1', 'v1'); //将key为'key1' value为'v1'的元素存入hash1表
$redis->hset('hash1', 'key2', 'v2');
$redis->hget('hash1', 'key1'); //取出表'hash1'中的key 'key1'的值,返回'v1'
//hexists 返回hash表中的指定key是否存在
$redis->hexists ('hash1', 'key1'); //true or false
//hdel 删除hash表中指定key的元素
$redis->hdel('hash1', 'key2'); //true or false
//hlen 返回hash表元素个数
$redis->hlen('hash1'); //1
//hsetnx 增加一个元素,但不能重复
$redis->hsetnx('hash1', 'key1', 'v2'); //false
$redis->hsetnx('hash1', 'key2', 'v2'); //true
//hmset/hmget 存取多个元素到hash表
$redis->hmset('hash1', array('key3' => 'v3', 'key4' => 'v4'));
$redis->hmget('hash1', array('key3', 'key4')); //返回相应的值 array('v3','v4')
//hincrby 对指定key进行累加
$redis->hincrby('hash1', 'key5', 3); //返回3
$redis->hincrby('hash1', 'key5', 10); //返回13
//hkeys 返回hash表中的所有key
$redis->hkeys('hash1'); //返回array('key1','key2','key3','key4','key5')
//hvals 返回hash表中的所有value
$redis->hvals('hash1'); //返回array('v1','v2','v3','v4',13)
//hgetall 返回整个hash表元素
//返回array('key1'=>'v1','key2'=>'v2','key3'=>'v3','key4'=>'v4','key5'=>13)
$redis->hgetall('hash1');
/**
排序操作
*/
//sort 排序
$redis->rpush('tab', 3);
$redis->rpush('tab', 2);
$redis->rpush('tab', 17);
$redis->sort('tab'); //返回array(2,3,17)
//使用参数,可组合使用 array('sort' => 'desc','limit' => array(1, 2))
$redis->sort('tab', array('sort' => 'desc')); //降序排列,返回array(17,3,2)
//返回顺序位置中1的元素2个(这里的2是指个数,而不是位置),返回array(3,17)
$redis->sort('tab', array('limit' => array(1, 2)));
//按首字符排序返回array(17,2,3),因为17的首字符是'1'所以排首位置
$redis->sort('tab', array('limit' => array('alpha' => true)));
//表示永久性排序,返回元素个数
$redis->sort('tab', array('limit' => array('store' => 'ordered')));
//使用了通配符'*'过滤元素,表示只返回以'pre_'开头的元素
$redis->sort('tab', array('limit' => array('get' => 'pre_*')));
/**
redis管理操作
*/
//select 指定要操作的数据库
$redis->select('mydb'); //指定为mydb,不存在则创建
//flushdb 清空当前库
$redis->flushdb();
//move 移动当库的元素到其它库
$redis->set('foo', 'bar');
$redis->move('foo', 'mydb2'); //若'mydb2'库存在
//info 显示服务当状态信息
$redis->info();
//slaveof 配置从服务器
//配置127.0.0.1端口80的服务器为从服务器
$redis->slaveof('127.0.0.1', 80);
$redis->slaveof(); //清除从服务器
//同步保存服务器数据到磁盘
$redis->save();
//异步保存服务器数据到磁盘
$redis->bgsave();
//??
$redis->bgrewriteaof();
//返回最后更新磁盘的时间
$redis->lastsave();
//set/get多个key-value
$mkv = array (
'usr:0001' => 'First user',
'usr:0002' => 'Second user',
'usr:0003' => 'Third user'
);
$redis->mset($mkv); //存储多个key对应的value
$retval = $redis->mget(array_keys($mkv)); //获取多个key对应的value
print_r($retval);
//批量操作
$replies = $redis->pipeline(function($pipe) {
$pipe->ping();
$pipe->flushdb();
$pipe->incrby('counter', 10); //增量操作
$pipe->incrby('counter', 30);
$pipe->exists('counter');
$pipe->get('counter');
$pipe->mget('does_not_exist', 'counter');
});
print_r($replies);
//CAS,事务性操作
function zpop($client, $zsetKey) {
$element = null;
$options = array (
'cas' => true, // Initialize with support for CAS operations
'watch' => $zsetKey, // Key that needs to be WATCHed to detect changes
'retry' => 3, // Number of retries on aborted transactions, after
// which the client bails out with an exception.
);
$txReply = $client->multiExec($options, function($tx )
use ($zsetKey, & $element) {
@ list($element) = $tx->zrange($zsetKey, 0, 0);
if (isset($element)) {
$tx->multi(); // With CAS, MULTI *must* be explicitly invoked.
$tx->zrem($zsetKey, $element);
}
});
return $element;
}
$zpopped = zpop($redis, 'zset');
echo isset($zpopped)? "ZPOPed $zpopped" : "Nothing to ZPOP!", "\n";
//对存取的key加前缀,如: 'nrk:'
$redis->getProfile()->setPreprocessor(new KeyPrefixPreprocessor('nrk:'));
//分布式存储的一些方法
$multiple_servers = array (
array (
'host' => '127.0.0.1',
'port' => 6379,
'database' => 15,
'alias' => 'first',
),
array (
'host' => '127.0.0.1',
'port' => 6380,
'database' => 15,
'alias' => 'second',
),
);
use Predis\Distribution\IDistributionStrategy;
class NaiveDistributionStrategy implements IDistributionStrategy {
private $_nodes, $_nodesCount;
public function __constructor() {
$this->_nodes = array();
$this->_nodesCount = 0;
}
public function add($node, $weight = null) {
$this->_nodes [ ] = $node;
$this->_nodesCount ++;
}
public function remove($node) {
$this->_nodes = array_filter($this->_nodes, function($n) use($node) {
return $n !== $node;
});
$this->_nodesCount = count($this->_nodes);
}
public function get($key) {
$count = $this->_nodesCount;
if ($count === 0) {
throw new RuntimeException('No connections');
}
return $this->_nodes [ $count > 1 ? abs(crc32($key) % $count) : 0 ];
}
public function generateKey($value) {
return crc32($value);
}
}
//配置键分布策略
$options = array (
'key_distribution' => new NaiveDistributionStrategy(),
);
$redis = new Predis\Client($multiple_servers, $options);
for ($i = 0; $i set("key:$i", str_pad($i, 4, '0', 0));
$redis->get("key:$i");
}
$server1 = $redis->getClientFor('first')-> info();
$server2 = $redis->getClientFor('second')-> info();
printf("Server '%s' has %d keys while server '%s' has %d keys.\n",
'first', $server1 [ 'db15' ] [ 'keys' ], 'second', $server2 [ 'db15' ] [ 'keys' ]
);
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