[minor] Implement 3rd-Eden/jackpot as connection pool, see #54

lib/connection.js

@@ -4,7 +4,6 @@ var EventEmitter = require('events').EventEmitter
   , spawn = require('child_process').spawn
   , Utils = require('./utils');
 
-exports.Manager = ConnectionManager; // connection pooling
 exports.IssueLog = IssueLog;         // connection issue handling
 exports.Available = ping;            // connection availablity
 
@@ -104,68 +103,3 @@ issues.attemptReconnect = function attemptReconnect () {
     Utils.merge(issue, JSON.parse(JSON.stringify(issue.config)));
   });
 };
-
-function ConnectionManager (name, limit, constructor) {
-  this.name = name;
-  this.total = limit;
-  this.factory = constructor;
-  this.connections = [];
-}
-
-var Manager = ConnectionManager.prototype;
-
-Manager.allocate = function allocate (callback) {
-  var total, i
-    , Manager = this;
-
-  i = total = this.connections.length;
-
-  // check for available
-  while (i--){
-    if (this.isAvailable(this.connections[i])) {
-      return callback(false, this.connections[i]);
-    }
-  }
-
-  // create new
-  if (total < this.total) {
-    return this.connections.push(this.factory.apply(this, arguments));
-  }
-
-  // give up and don't saturate the node.js process by retying #43
-  var full = new Error("All the connections in the memcached pool are busy");
-  full.connectionPool = true;
-  callback(full);
-};
-
-Manager.isAvailable = function isAvailable (connection) {
-  var readyState = connection.readyState;
-  return (readyState === 'open' || readyState === 'writeOnly')
-    && !(connection._writeQueue && connection._writeQueue.length)
-    && !(connection._handle && connection._handle.writeQueueSize);
-};
-
-Manager.remove = function remove (connection) {
-  var position = this.connections.indexOf(connection);
-
-  if (position !== -1) this.connections.splice(position, 1);
-  if (connection.readyState && connection.readyState !== 'closed' && connection.end) {
-    connection.end();
-  }
-};
-
-Manager.free  = function freemymemories (keep) {
-  var save = 0
-    , connection;
-
-  while (this.connections.length) {
-    connection = this.connections.shift();
-
-    if (save < keep && this.isAvailable(this.connection[0])) {
-      save++;
-      continue;
-    }
-
-    this.remove(connection);
-  }
-};