complete redesign: use nodejs on server instead of php - documentation to be updated

nodejs/node_modules/mysql/lib/PoolNamespace.js

@@ -0,0 +1,68 @@
+var PoolSelector = require('./PoolSelector');
+
+module.exports = PoolNamespace;
+
+/**
+ * PoolNamespace
+ */
+function PoolNamespace(cluster, pattern, selector) {
+  this._cluster = cluster;
+  this._pattern = pattern;
+  this._selector = new PoolSelector[selector]();
+}
+
+PoolNamespace.prototype.getConnection = function(cb) {
+  var clusterNode = this._getClusterNode();
+  var cluster     = this._cluster;
+  var namespace   = this;
+
+  if (clusterNode === null) {
+    var err = null;
+
+    if (this._cluster._findNodeIds(this._pattern, true).length !== 0) {
+      err = new Error('Pool does not have online node.');
+      err.code = 'POOL_NONEONLINE';
+    } else {
+      err = new Error('Pool does not exist.');
+      err.code = 'POOL_NOEXIST';
+    }
+
+    return cb(err);
+  }
+
+  cluster._getConnection(clusterNode, function(err, connection) {
+    var retry = err && cluster._canRetry
+      && cluster._findNodeIds(namespace._pattern).length !== 0;
+
+    if (retry) {
+      return namespace.getConnection(cb);
+    }
+
+    if (err) {
+      return cb(err);
+    }
+
+    cb(null, connection);
+  });
+};
+
+PoolNamespace.prototype._getClusterNode = function _getClusterNode() {
+  var foundNodeIds = this._cluster._findNodeIds(this._pattern);
+  var nodeId;
+
+  switch (foundNodeIds.length) {
+    case 0:
+      nodeId = null;
+      break;
+    case 1:
+      nodeId = foundNodeIds[0];
+      break;
+    default:
+      nodeId = this._selector(foundNodeIds);
+      break;
+  }
+
+  return nodeId !== null
+    ? this._cluster._getNode(nodeId)
+    : null;
+};