Initial commit

src/common/bufferSegment.js

@@ -0,0 +1,32 @@
+/**
+ * Create a buffer segment
+ * @param {Buffer} buf
+ * @param {number} [offset]
+ * @param {number} [count]
+ * @constructor
+ */
+function BufferSegment(buf, offset, count) {
+  if (!Buffer.isBuffer(buf)) throw new TypeError('buf must be a buffer');
+
+  this.buffer = buf;
+  this.offset = offset || 0;
+  this.count = count || buf.length;
+}
+
+BufferSegment.prototype.toString = function() {
+  return this.buffer.toString('utf8', this.offset, this.offset + this.count);
+};
+
+BufferSegment.prototype.toBuffer = function() {
+  if (this.offset === 0 && this.count === this.buffer.length)
+      return this.buffer;
+  return this.buffer.slice(this.offset, this.offset + this.count);
+};
+
+BufferSegment.prototype.copyTo = function(dst, offset) {
+  this.buffer.copy(dst, offset, this.offset, this.offset + this.count);
+};
+
+module.exports = function(buf, offset, count) {
+  return new BufferSegment(buf, offset, count);
+};

src/common/hash.js

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+/**
+ * @constructor
+ * @property {number} length
+ */
+function Hash() {
+  this._ = {};
+  this._length = 0;
+}
+Object.defineProperty(Hash.prototype, 'length', {
+  get: function() {
+    return this._length;
+  }
+});
+
+Hash.prototype.add = function(key,value) {
+  this._[key] = value;
+  this._length++;
+};
+
+Hash.prototype.clear = function() {
+  this._ = {};
+  this._length = 0;
+};
+
+Hash.prototype.forEach = function(cb) {
+  for(var k in this._) {
+    cb(k, this._[k]);
+  }
+};
+
+Hash.prototype.get = function(key) {
+  return this._[key];
+};
+
+Hash.prototype.remove = function(key) {
+  delete this._[key];
+  this._length--;
+};
+
+
+module.exports = Hash;

src/common/log/noopLogger.js

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+function NoopLogger() {
+}
+NoopLogger.prototype.error = function() {};
+NoopLogger.prototype.debug = function() {};
+NoopLogger.prototype.info = function() {};
+
+module.exports = NoopLogger;

src/common/systemEventTypes.js

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+const SystemEventTypes = {
+  StreamMetadata: '$metadata'
+};
+
+module.exports = SystemEventTypes;

src/common/systemStreams.js

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+module.exports.metastreamOf = function(stream) {
+  return '$$' + stream;
+};
+module.exports.isMetastream = function(stream) {
+  return stream.indexOf('$$') === 0;
+};

src/common/utils/ensure.js

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+module.exports.notNullOrEmpty = function(value, name) {
+  if (value === null)
+    throw new Error(name + " is null.");
+  if (value === '')
+    throw new Error(name + " is empty.");
+};