hdb/lib/protocol/Transaction.js

SAP HANA Database Client for Node

// Copyright 2013 SAP AG.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http: //www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
// either express or implied. See the License for the specific
// language governing permissions and limitations under the License.
'use strict';

var util = require('../util');
var EventEmitter = require('events').EventEmitter;
var ErrorLevel = require('./common/ErrorLevel');
var debug = util.debuglog('hdbtx');

module.exports = Transaction;

util.inherits(Transaction, EventEmitter);

function Transaction() {
  EventEmitter.call(this);

  this.autoCommit = true;
  this.kind = 'none';
  this.error = undefined;
}

Transaction.prototype.setAutoCommit = function setAutoCommit(autoCommit) {
  this.autoCommit = autoCommit;
};

Transaction.prototype.setFlags = function setFlags(flags) {
  debug(flags);
  if (flags.committed) {
    this.emit('end', true, this.kind);
    this.kind = 'none';
  }
  if (flags.rolledBack) {
    this.emit('end', false, this.kind);
    this.kind = 'none';
  }
  if (flags.writeTransactionStarted) {
    this.kind = 'write';
    this.emit('new', this.kind);
  }
  if (flags.noWriteTransactionStarted) {
    this.kind = 'read';
    this.emit('new', this.kind);
  }
  if (flags.sessionClosingTransactionErrror) {
    this.error = new Error(
      'A transaction error occured that implies the session must be terminated.'
    );
    this.error.code = 'EHDBTX';
    this.error.level = ErrorLevel.FATAL;
    this.error.fatal = true;
    this.emit('error', this.error);
  }
};