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| // # Transaction
// Can be used to send (many) cypher statement(s) as transaction
// see: [http://docs.neo4j.org/chunked/preview/rest-api-transactional.html](http://docs.neo4j.org/chunked/preview/rest-api-transactional.html)
var __initTransaction__ = function(neo4jrestful) {
var Statement = function Statement(transaction, cypher, parameters) {
this._transaction_ = transaction;
this.statement = cypher;
this.parameters = parameters;
}
Statement.prototype._transaction_ = null;
Statement.prototype.statement = '';
Statement.prototype.parameters = null;
Statement.prototype.status = null; // 'sending', 'sended'
Statement.prototype.position = null;
Statement.prototype.results = null;
Statement.prototype.errors = null;
Statement.prototype.toObject = function() {
return {
statement: this.statement,
parameters: JSON.stringify(this.parameters),
status: this.status,
position: this.position,
errors: this.errors,
results: this.results,
};
}
var Transaction = function Transaction(cypher, parameters, cb) {
this.neo4jrestful = neo4jrestful.singleton();
this.begin(cypher, parameters, cb);
}
Transaction.Statement = Statement;
Transaction.prototype.statements = null;
Transaction.prototype._response_ = null;
Transaction.prototype.neo4jrestful = null;
Transaction.prototype.status = ''; // new|creating|open|committing|committed
Transaction.prototype.id = null;
Transaction.prototype.uri = null
Transaction.prototype.expires = null;
Transaction.prototype.results = null;
Transaction.prototype._concurrentTransmissions_ = 0;
Transaction.prototype._responseError_ = null; //will contain response Error
Transaction.prototype._resortResults_ = true;
Transaction.prototype.begin = function(cypher, parameters, cb) {
// reset
this.statements = [];
this.results = [];
this.errors = [];
this.id = null;
this.status = 'new';
return this.add(cypher, parameters, cb);
}
Transaction.prototype.add = function(cypher, parameters, cb) {
var args = Transaction._sortTransactionArguments(cypher, parameters, cb);
var statements = args.statements;
// we cancel the operation if we are comitting
Iif (this.status === 'committed') {
var err = Error("You can't add statements after transaction is committed");
if (typeof args.cb === 'function') {
cb(err, null);
} else {
throw err;
}
return this;
}
this.addStatementsToQueue(statements);
if (args.cb) {
cb = args.cb;
} else {
// we execute if we have a callback
// till then we'll collect the statements
return this;
}
return this.exec(cb);
}
Transaction.prototype.exec = function(cb) {
var self = this;
// stop here if there is no callback attached
Iif (typeof cb !== 'function') {
return this;
}
self.onResponse = cb;
var url = '';
var untransmittedStatements = this.untransmittedStatements();
if (this.status === 'committing') {
// commit transaction
url = (this.id) ? '/transaction/'+this.id+'/commit' : '/transaction/commit';
} else if (!this.id) {
// begin a transaction
this.status = 'creating';
url = '/transaction';
} else Eif (this.status === 'open') {
// add to transaction
this.status = 'adding';
url = '/transaction/'+this.id;
} else if (this.status = 'committed') {
cb(Error('Transaction is committed. Create a new transaction instead.'), null, null);
} else {
throw Error('Transaction has a unknown status. Possible are: creating|open|committing|committed');
}
var statements = [];
untransmittedStatements.forEach(function(statement, i){
self.statements[i].status = 'sending';
statements.push({ statement: statement.statement, parameters: statement.parameters });
});
this._concurrentTransmissions_++;
this.neo4jrestful.post(url, { data: { statements: statements } }, function(err, response, debug) {
self._response_ = response;
self._concurrentTransmissions_--;
self._applyResponse(err, response, debug, untransmittedStatements);
untransmittedStatements.forEach(function(statement) {
self.statements[statement.position].status = statement.status = 'sended';
});
untransmittedStatements = self.untransmittedStatements();
Iif (untransmittedStatements.length > 0) {
// re call exec() until all statements are transmitted
// TODO: set a limit to avoid endless loop
return self.exec(cb);
}
// TODO: sort and populate resultset, but currently no good way to detect result objects
else Eif (self._concurrentTransmissions_ === 0) {// {
Eif (typeof self.onResponse === 'function') {
var cb = self.onResponse;
// release onResponse for (optional) next cb
self.onResponse = null;
// call final callback
if (self.status === 'committing')
self.status = 'committed';
cb(self._responseError_, self, debug);
return self;
}
}
});
return this;
}
Transaction.prototype.addStatementsToQueue = function(statements) {
var self = this;
if ((statements) && (statements.constructor === Array) && (statements.length > 0)) {
// attach all statments
statements.forEach(function(data){
Eif (data.statement) {
var statement = new Statement(self, data.statement, data.parameters);
statement.position = self.statements.length;
self.statements.push(statement);
}
});
}
return this;
}
Transaction.prototype._applyResponse = function(err, response, debug, untransmittedStatements) {
var self = this;
// if error on request/response
if (self.status !== 'committing')
self.status = 'open';
Iif (err) {
self.status = (err.status) ? err.status : err;
if (!self.status)
self.status = self._response_.status;
}
untransmittedStatements.forEach(function(statement, i){
if (response.errors[i]) {
statement.error = response.errors[i];
self.errors.push(response.errors[i]);
}
if (response.results[i]) {
Eif (self._resortResults_) {
// move row property one level above
// { rows: [ {}, {} ]} -> { [ {}, {} ]}
response.results[i].data.forEach(function(data, j){
//if ((response.results[i]) && (data.row)) {
Eif (data.row) {
response.results[i].data[j] = data.row;
}
})
}
self.results.push(response.results[i]);
}
});
Iif ((err)||(!response)) {
self._responseError_ = (self._responseError_) ? self._responseError_.push(err) : self._responseError_ = [ err ];
} else {
self.populateWithDataFromResponse(response);
// keep track of open transactions
if (self.status === 'open')
Transaction.__open_transactions__[self.id] = self;
else
delete Transaction.__open_transactions__[self.id];
}
}
Transaction.prototype.toObject = function() {
var statements = [];
this.statements.forEach(function(stat){
statements.push(stat.toObject());
});
return {
id: this.id,
status: this.status,
statements: statements,
expires: this.expires,
uri: this.uri,
};
}
Transaction.prototype.populateWithDataFromResponse = function(data) {
Eif (data) {
if ((data.transaction) && (data.transaction.expires))
this.expires = new Date(data.transaction.expires);
// exists only on POST a new transaction
if (data.commit) {
var match = data.commit.match(/^(.+?\/transaction\/(\d+))\/commit$/);
this.id = Number(match[2]);
this.uri = match[1];
}
}
}
Transaction.prototype.untransmittedStatements = function() {
var statements = [];
this.statements.forEach(function(statement){
if ((statement)&&(!statement.status))
statements.push(statement);
});
return statements;
}
Transaction.prototype.commit = function(cypher, parameters, cb) {
if (typeof cypher === 'function') {
cb = cypher;
} else {
var args = Transaction._sortTransactionArguments(cypher, parameters, cb);
this.addStatementsToQueue(args.statements);
cb = args.cb;
}
Iif (typeof cb !== 'function') {
throw Error('You need to attach a callback an a commit/close operation');
}
this.onResponse = cb;
this.status = 'committing';
return this.exec(cb);
}
Transaction.prototype.close = Transaction.prototype.commit;
Transaction.create = function(cypher, parameters, cb) {
return new Transaction(cypher, parameters, cb);
}
Transaction.new = function(cypher, parameters) {
return new Transaction(cypher, parameters);
}
Transaction.prototype.onResponse = null;
Transaction._sortTransactionArguments = function(cypher, parameters, cb) {
var statements = null;
// we might have a Graph or CypherQuery Object
if ((typeof cypher === 'object') && ((typeof cypher.toQuery === 'function') || (typeof cypher.statementsToString === 'function'))) {
Eif (cypher.toQuery) {
statements = [ { statement: cypher.toQuery().statementsToString(), parameters: cypher.parameters() }];
} else {
statements = [ { statement: cypher.statementsToString(), parameters: cypher.parameters() }];
}
cb = parameters;
} else if (typeof cypher === 'string') {
Iif (typeof parameters === 'function') {
cb = parameters;
parameters = {};
}
statements = [ { statement: cypher, parameters: parameters || {} } ];
} else Iif ((cypher) && (cypher.constructor === Array)) {
cb = parameters;
statements = cypher;
} else Iif ((cypher) && (cypher.statement)) {
statements = [ cypher ];
}
return {
statements: statements,
cb: cb || null
}
}
Transaction.prototype.rollback = function(cb) {
var self = this;
Eif ((this.id)&&(this.status!=='finalized')) {
this.neo4jrestful.delete('/transaction/'+this.id, function(err, res, debug) {
// remove from open_transactions
Eif (!err)
delete Transaction.__open_transactions__[self.id];
cb(err, res, debug);
});
} else {
cb(Error('You can only perform a rollback on an open transaction.'), null);
}
return this;
}
Transaction.prototype.undo = Transaction.prototype.rollback;
Transaction.prototype.delete = Transaction.prototype.rollback;
Transaction.begin = function(cypher, parameters, cb) {
return new Transaction(cypher, parameters, cb);
}
Transaction.create = Transaction.begin;
Transaction.open = Transaction.begin;
Transaction.commit = function(cypher, parameters, cb) {
return new Transaction().commit(cypher, parameters, cb);
}
Transaction.executeAllOpenTransactions = function(cb, action) {
// action can be commit|rollback
Iif (typeof action === 'undefined')
action = 'commit';
var count = Object.keys(Transaction.__open_transactions__).length;
var errors = [];
var debugs = [];
var _onDone_ = function(err, res, debug) {
count--;
Iif (err)
errors.push(err);
debugs.push(debug);
if (count === 0)
cb( ((errors.length > 0) ? errors : null), null, debugs );
}
for (var id in Transaction.__open_transactions__) {
Transaction.__open_transactions__[id][action](_onDone_);
}
return this;
}
Transaction.commitAll = function(cb) {
return this.executeAllOpenTransactions(cb, 'commit');
}
Transaction.closeAll = Transaction.commitAll;
Transaction.rollbackAll = function(cb) {
Transaction.executeAllOpenTransactions(cb, 'rollback');
}
Transaction.deleteAll = Transaction.rollbackAll;
Transaction.undoAll = Transaction.rollbackAll;
// all open transactions
Transaction.__open_transactions__ = {};
return neo4jrestful.Transaction = Transaction;
}
Eif (typeof window !== 'object') {
module.exports = exports = {
init: __initTransaction__
};
} else {
window.Neo4jMapper.initTransaction = __initTransaction__;
}
|