jones-ndb/impl/ndb/NdbAutoIncrement.js (91 lines of code) (raw):
/*
Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
"use strict";
var conf = require("./path_config"),
jones = require("database-jones"),
adapter = require(conf.binary).ndb,
stats_module = require(jones.api.stats),
QueuedAsyncCall = require(jones.common.QueuedAsyncCall).QueuedAsyncCall,
udebug = unified_debug.getLogger("NdbAutoIncrement.js");
/** NdbAutoIncrementCache
Wraps an Ndb object which manages (and caches) auto-inc values for a table.
The API is that first you call prefetch(n) indicating how many values you
want. Then you call getValue() once for each desired value.
*/
function NdbAutoIncrementCache(table) {
udebug.log("New cache for table", table.name);
this.table = table;
this.impl = table.per_table_ndb;
this.execQueue = [];
}
NdbAutoIncrementCache.prototype = {
table : null,
impl : null,
execQueue : null,
batch_size : 1
};
NdbAutoIncrementCache.prototype.prefetch = function(n) {
this.batch_size += n;
};
NdbAutoIncrementCache.prototype.getValue = function(callback) {
var cache = this;
var apiCall = new QueuedAsyncCall(this.execQueue, callback);
udebug.log("NdbAutoIncrementCache getValue table:", this.table.name,
"queue:", this.execQueue.length, "batch:", this.batch_size);
apiCall.description = "AutoIncrementCache getValue";
apiCall.batch_size = this.batch_size;
apiCall.run = function() {
adapter.impl.getAutoIncrementValue(cache.impl, cache.table, this.batch_size,
this.callback);
cache.batch_size--;
};
apiCall.enqueue();
};
/* TODO: This now creates an autoIncrementCache even for tables with no
auto-inc columns; maybe don't do that.
*/
function getAutoIncCacheForTable(table) {
if(table.per_table_ndb) {
table.autoIncrementCache = new NdbAutoIncrementCache(table);
}
}
/** NdbAutoIncrementHandler
This provides a service to NdbTransactionHandler.execute()
which, given a list of operations, may need to populate them with
auto-inc values before executing.
*/
function NdbAutoIncrementHandler(operations) {
var i, op;
this.autoinc_op_list = [];
for(i = 0 ; i < operations.length ; i++) {
op = operations[i];
if(typeof op.tableHandler.autoIncColumnNumber === 'number' && op.needAutoInc) {
this.values_needed++;
this.autoinc_op_list.push(op);
op.tableHandler.dbTable.autoIncrementCache.prefetch(1);
}
}
udebug.log("New Handler",this.autoinc_op_list.length,"/",operations.length);
}
NdbAutoIncrementHandler.prototype = {
values_needed : 0,
autoinc_op_list : null,
final_callback : null,
errors : 0
};
function makeOperationCallback(handler, op) {
return function(err, value) {
udebug.log("getValue operation callback value:", value, "qlen:",
op.tableHandler.dbTable.autoIncrementCache.execQueue.length);
handler.values_needed--;
if(value > 0) {
op.result.insert_id = value;
op.tableHandler.setAutoincrement(op.values, value);
}
else {
handler.erorrs++;
}
if(handler.values_needed === 0) {
handler.dispatchFinalCallback();
}
};
}
NdbAutoIncrementHandler.prototype.dispatchFinalCallback = function() {
this.final_callback(this.errors, this);
};
NdbAutoIncrementHandler.prototype.getAllValues = function(callback) {
var i, op, cache;
this.final_callback = callback;
for(i = 0 ; i < this.autoinc_op_list.length ; i++) {
op = this.autoinc_op_list[i];
cache = op.tableHandler.dbTable.autoIncrementCache;
cache.getValue(makeOperationCallback(this, op));
}
};
exports.getCacheForTable = getAutoIncCacheForTable;
exports.AutoIncHandler = NdbAutoIncrementHandler;