nodejs之memcached连接池

nodejs之memcached连接池：

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/**  * memcached 连接池  **/ var options = {     //'host': ['localhost:11211'],     'host': 'localhost:11211',     'connectionLimit': '2',     'timeout' : 50000 }; var poolModule = require('generic-pool'); console.log("init pool for memcached start.."); var pool = poolModule.Pool({     name : 'memcached',     create : function(callback){         var Memcached = require('memcached');         memcached = new Memcached(options.host, {debug: true});         memcached.on("failure", function (detail) {})                  .on('connect', function (detail) {})                  .on('reconnect', function (detail) {})                  .on('reconnecting', function (detail) {})                  .on('remove', function (detail) {})                  .on('issue', function (detail) {});         callback(null, memcached);     },     destory : function(client){         if(client.connected){             try{                 client.end();             }             catch(err){                 console.log('Failed to memcached connection: ' + err);             }         }     },     max : options.connectionLimit,     idleTimeoutMillis : options.timeout,     log : false }); console.log("init pool for memcached end....");   exports.set = function(key, val, expire, callback){     pool.acquire(function(err, client){         if(err){             callback(err);             return;         }         if(!expire) expire = 172800;         client.set(key, val, expire, function(err, data){             pool.release(client);             if(err){                 callback(err, null);                 return;             }             callback(err, data);         });     }); };   exports.get = function(key, callback){     pool.acquire(function(err, client){         if(err){             callback(err);             return;         }         client.get(key, function(err, data){             pool.release(client);             if(err){                 callback(err, null);                 return;             }             callback(err, data);         });     }); };