A first version without unit tests, but a gross test script
This commit is contained in:
Fabrice Marsaud
parent
c3a01c240b
commit
cdb9c661bd
@ -1,17 +1,21 @@
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import makeError from 'make-error';
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var IllegalKey = makeError('IllegalKey');
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var IllegalId = makeError('IllegalId');
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var OverrideViolation = makeError('OverrideViolation');
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var NotFound = makeError('NotFound');
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var TransactionAlreadyOpened = makeError('TransactionAlreadyOpened');
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var NoTransactionOpened = makeError('NoTransactionOpened');
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var FailedRollback = makeError('FailedRollback');
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var FailedReplay = makeError('FailedReplay');
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var UnrecognizedTransactionItem = makeError('UnrecognizedTransactionItem');
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var UnexpectedLogFormat = makeError('UnexpectedLogFormat');
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var UnexpectedLogItemData = makeError('UnexpectedLogItemData');
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class Collection {
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constructor(strictMode = true) {
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constructor() {
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this._collection = {};
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this._strictMode = strictMode;
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this._transaction = null;
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}
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@ -20,11 +24,11 @@ class Collection {
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try {
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if (this._strictMode && null !== this._transaction) {
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if (null !== this._transaction) {
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throw new TransactionAlreadyOpened('A transaction is already opened');
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}
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this._transaction = this._transaction || [];
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this._transaction = [];
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if ('function' === typeof callback) {
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callback(null, this);
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@ -49,11 +53,11 @@ class Collection {
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try {
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if (this._strictMode && null === this._transaction) {
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if (null === this._transaction) {
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throw new NoTransactionOpened('No opened transaction to commit.');
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}
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let transactionLog = this._transaction || [];
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let transactionLog = this._transaction;
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this._transaction = null;
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if ('function' === typeof callback) {
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@ -75,20 +79,226 @@ class Collection {
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}
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rollback(callback = undefined) {
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try {
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if (null === this._transaction) {
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throw new NoTransactionOpened('No opened transaction to rollback.');
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}
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let log = this._transaction;
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this._transaction = null;
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return this._rollback(log, callback);
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} catch(err) {
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if ('function' === typeof callback) {
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callback(err);
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} else {
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throw err;
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}
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}
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}
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_rollback(log, callback = undefined) {
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try {
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if (!Array.isArray(log)) {
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throw new UnexpectedLogFormat('A transaction log must be an Array.');
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}
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let item;
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let done = [];
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while(item = log.pop()) {
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try {
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this.checkLogItem(item);
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switch (item.action) {
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case 'insert':
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this.delete(item.id);
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break;
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case 'update':
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this.update(item.id, item.former);
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break;
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case 'delete':
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this.insert(item.id, item.former);
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break;
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default:
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throw new UnrecognizedTransactionItem(
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'Unrecognized item action : "' + item.action +
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'" at index ' + log.lenght + '.'
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);
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}
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done.unshift(item);
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} catch(err) {
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let exc = new FailedRollback(
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'Rollback failed on index ' + log.lenght + '.'
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);
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exc.undone = log;
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exc.done = done;
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exc.internal = err;
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exc.failedAction = item;
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exc.index = log.lenght;
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throw exc;
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}
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}
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if ('function' === typeof callback) {
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callback(null, this);
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} else {
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return this;
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}
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} catch(err) {
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if ('function' === typeof callback) {
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callback(err);
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} else {
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throw err;
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}
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}
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}
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replay(log, callback = undefined) {
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try {
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if (!Array.isArray(log)) {
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throw new UnexpectedLogFormat('A transaction log must be an Array.');
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}
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let item;
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let done = [];
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while(item = log.shift()) {
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try {
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this.checkLogItem(item);
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switch (item.action) {
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case 'insert':
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this.insert(item.id, item.item);
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break;
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case 'update':
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this.update(item.id, item.item);
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break;
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case 'delete':
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this.delete(item.id);
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break;
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default:
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throw new UnrecognizedTransactionItem(
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'Unrecognized item action : "' + item.action +
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'" at index ' + done.lenght + '.'
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);
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}
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done.push(item);
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} catch(err) {
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let exc = new FailedReplay(
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'Replay failed on index ' + done.lenght + '.'
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);
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exc.undone = log;
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exc.done = done;
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exc.internal = err;
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exc.failedAction = item;
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exc.index = done.lenght;
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throw exc;
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}
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}
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if ('function' === typeof callback) {
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callback(null, this);
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} else {
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return this;
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}
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} catch(err) {
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if ('function' === typeof callback) {
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callback(err);
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} else {
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throw err;
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}
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}
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}
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checkLogItem (item) {
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if (!item.hasOwnProperty('id')) {
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throw new UnexpectedLogItemData(
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'Missing id for ' + item.action + ' object.'
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);
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}
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let checkFormer = () => {
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if (!item.hasOwnProperty('former')) {
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throw new UnexpectedLogItemData(
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'Missing former item in ' + item.action + ' object.'
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);
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}
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};
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let checkItem = () => {
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if (!item.hasOwnProperty('item')) {
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throw new UnexpectedLogItemData(
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'Missing item in ' + item.action + ' object.'
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);
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}
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};
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switch (item.action) {
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case 'update':
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checkItem();
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case 'delete':
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checkFormer();
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break;
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case 'insert':
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checkItem();
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break;
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default:
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throw new UnrecognizedTransactionItem(
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'Unrecognizes item action : "' + item.action + '.'
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);
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}
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}
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insert(id, item, callback = undefined) {
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try {
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id = this.checkId(id);
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this.checkId(id);
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if (this._strictMode && this._has(id)) {
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if (this._has(id)) {
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throw new OverrideViolation(
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'An insertion must not override the pre-existing key ' + id + '. ' +
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'An insertion must not override the pre-existing id ' + id + '. ' +
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'Consider using update instead depending on your use case.'
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);
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}
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this._collection[id] = item;
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if (this._transaction) {
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this._transaction.push({
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action: 'insert',
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id,
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item
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});
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}
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if ('function' === typeof callback) {
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callback(null, this);
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@ -112,16 +322,28 @@ class Collection {
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try {
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id = this.checkId(id);
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this.checkId(id);
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if (this._strictMode && !this._has(id)) {
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if (!this._has(id)) {
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throw new NotFound(
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'No item to update at this key ' + id + '. ' +
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'No item to update at id ' + id + '. ' +
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'Consider using insert instead depending on your usecase.'
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);
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}
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let former = this._collection[id];
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this._collection[id] = item;
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if (this._transaction) {
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this._transaction.push({
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action: 'update',
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id,
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former,
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item
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});
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}
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if ('function' === typeof callback) {
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callback(null, this);
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@ -145,15 +367,25 @@ class Collection {
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try {
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id = this.checkId(id);
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this.checkId(id);
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if (this._strictMode && !this._has(id)) {
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if (!this._has(id)) {
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throw new NotFound(
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'No item to remove at key' + id + '.'
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'No item to remove at id' + id + '.'
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);
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}
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let former = this._collection[id];
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delete this._collection[id];
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if (this._transaction) {
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this._transaction.push({
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action:'delete',
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id,
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former
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});
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}
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if ('function' === typeof callback) {
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callback(null, this);
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@ -177,11 +409,11 @@ class Collection {
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try {
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id = this.checkId(id);
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this.checkId(id);
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if (this._strictMode && !this._has(id)) {
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if (!this._has(id)) {
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throw new NotFound(
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'No item found at key ' + id
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'No item found at id ' + id
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);
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}
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@ -205,15 +437,8 @@ class Collection {
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checkId (id) {
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if (undefined === id || null === id) {
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throw new IllegalKey('Illegal key : ' + id);
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}
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id = this._strictMode && id || String(id);
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if ('string' === typeof id && id.length > 0) {
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return id;
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} else {
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throw new IllegalKey('Key must be a non-empty string');
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if ('string' !== typeof id || id.length < 1) {
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throw new IllegalId('id must be a non-empty string');
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}
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}
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@ -232,7 +457,16 @@ class Collection {
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}
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export var Collection = Collection;
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export var IllegalKey = IllegalKey;
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export var OverrideViolation = OverrideViolation;
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export var NotFound = NotFound;
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export default {
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Collection,
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IllegalId,
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OverrideViolation,
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NotFound,
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TransactionAlreadyOpened,
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NoTransactionOpened,
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FailedRollback,
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FailedReplay,
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UnrecognizedTransactionItem,
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UnexpectedLogFormat,
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UnexpectedLogItemData
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};
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15
packages/xo-collection/package.json
Normal file
15
packages/xo-collection/package.json
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@ -0,0 +1,15 @@
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{
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"name": "xo-collection",
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"version": "0.0.0",
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"description": "A generice batch collection attempt",
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"main": "collection.js",
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"dependencies": {
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"make-error": "^0.3.0"
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},
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"devDependencies": {},
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"scripts": {
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"test": "echo \"Error: no test specified\" && exit 1"
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},
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"author": "Fabrice Marsaud <fabrice.marsaud@vates.fr>",
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"license": "aGPLv3"
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}
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65
packages/xo-collection/test.js
Normal file
65
packages/xo-collection/test.js
Normal file
@ -0,0 +1,65 @@
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import xoCollection from './collection';
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var co = new xoCollection.Collection();
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co.begin();
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co.insert('a', 1000);
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console.log('a', co.get('a'));
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co.update('a', 2000);
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console.log('a', co.get('a'));
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co.delete('a');
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try {
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console.log(co.get('a'));
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} catch(e) {
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console.error(e);
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}
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console.log(co.commit());
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console.log('=====');
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co.insert('b', 100);
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console.log('b', co.get('b'));
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co.begin();
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co.update('b', 200);
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console.log('b', co.get('b'));
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co.insert('c', 300);
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co.update('b', 400);
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console.log('b', co.get('b'), 'c', co.get('c'));
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co.delete('b');
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try {
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console.log(co.get('b'));
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} catch(e) {
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console.error(e);
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}
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co.rollback();
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console.log('b', co.get('b'));
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try {
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console.log(co.get('c'));
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} catch(e) {
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console.error(e);
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}
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console.log('=====');
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var coa = new xoCollection.Collection();
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coa.insert('x', 999);
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coa.begin();
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coa.insert('a', 100);
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coa.update('a', 150);
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coa.insert('b', 200);
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console.log('a', coa.get('a'), 'b', coa.get('b'), 'x', coa.get('x'));
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var log = coa.commit();
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var cob = new xoCollection.Collection();
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cob.replay(log);
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console.log('a', cob.get('a'), 'b', cob.get('b'));
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try {
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console.log(cob.get('x'));
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} catch(e) {
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console.error(e);
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}
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process.exit(0);
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Block a user