Add Object.freeze on private enums

Improve code readability

src/client.js

@@ -53,29 +53,29 @@ function createEventData(eventId, type, isJson, data, metadata) {
 }
 
 // Expose classes
-module.exports.Position = results.Position;
-module.exports.UserCredentials = require('./systemData/userCredentials');
-module.exports.PersistentSubscriptionSettings = require('./persistentSubscriptionSettings');
-module.exports.SystemConsumerStrategies = require('./systemConsumerStrategies');
-module.exports.GossipSeed = require('./gossipSeed');
-module.exports.EventStoreConnection = require('./eventStoreConnection');
-module.exports.ProjectionsManager = require('./projections/projectionsManager');
+exports.Position = results.Position;
+exports.UserCredentials = require('./systemData/userCredentials');
+exports.PersistentSubscriptionSettings = require('./persistentSubscriptionSettings');
+exports.SystemConsumerStrategies = require('./systemConsumerStrategies');
+exports.GossipSeed = require('./gossipSeed');
+exports.EventStoreConnection = require('./eventStoreConnection');
+exports.ProjectionsManager = require('./projections/projectionsManager');
 // Expose errors
-module.exports.WrongExpectedVersionError = require('./errors/wrongExpectedVersionError');
-module.exports.StreamDeletedError = require('./errors/streamDeletedError');
-module.exports.AccessDeniedError = require('./errors/accessDeniedError');
-module.exports.ProjectionCommandFailedError = require('./errors/projectionCommandFailedError');
+exports.WrongExpectedVersionError = require('./errors/wrongExpectedVersionError');
+exports.StreamDeletedError = require('./errors/streamDeletedError');
+exports.AccessDeniedError = require('./errors/accessDeniedError');
+exports.ProjectionCommandFailedError = require('./errors/projectionCommandFailedError');
 // Expose enums/constants
-module.exports.expectedVersion = expectedVersion;
-module.exports.positions = positions;
-module.exports.streamPosition = streamPosition;
-module.exports.systemMetadata = require('./common/systemMetadata');
-module.exports.eventReadStatus = results.EventReadStatus;
-module.exports.sliceReadStatus = require('./sliceReadStatus');
+exports.expectedVersion = expectedVersion;
+exports.positions = positions;
+exports.streamPosition = streamPosition;
+exports.systemMetadata = require('./common/systemMetadata');
+exports.eventReadStatus = results.EventReadStatus;
+exports.sliceReadStatus = require('./sliceReadStatus');
 // Expose loggers
-module.exports.NoopLogger = require('./common/log/noopLogger');
-module.exports.FileLogger = require('./common/log/fileLogger');
+exports.NoopLogger = require('./common/log/noopLogger');
+exports.FileLogger = require('./common/log/fileLogger');
 // Expose Helper functions
-module.exports.createConnection = require('./eventStoreConnection').create;
-module.exports.createJsonEventData = createJsonEventData;
-module.exports.createEventData = createEventData;
+exports.createConnection = require('./eventStoreConnection').create;
+exports.createJsonEventData = createJsonEventData;
+exports.createEventData = createEventData;

src/clientOperations/appendToStreamOperation.js

@@ -44,8 +44,7 @@ AppendToStreamOperation.prototype._inspectResponse = function(response) {
   switch (response.result)
   {
     case ClientMessage.OperationResult.Success:
-      if (this._wasCommitTimeout)
-        this.log.debug("IDEMPOTENT WRITE SUCCEEDED FOR %s.", this);
+      if (this._wasCommitTimeout) this.log.debug("IDEMPOTENT WRITE SUCCEEDED FOR %s.", this);
       this._succeed();
       return new InspectionResult(InspectionDecision.EndOperation, "Success");
     case ClientMessage.OperationResult.PrepareTimeout:
@@ -80,4 +79,4 @@ AppendToStreamOperation.prototype.toString = function() {
   return util.format("Stream: %s, ExpectedVersion: %d", this._stream, this._expectedVersion);
 };
 
-module.exports = AppendToStreamOperation;
+module.exports = AppendToStreamOperation;

src/clientOperations/commitTransactionOperation.js

@@ -1,5 +1,4 @@
 var util = require('util');
-var uuid = require('uuid');
 
 var TcpCommand = require('../systemData/tcpCommand');
 var InspectionDecision = require('../systemData/inspectionDecision');

src/clientOperations/connectToPersistentSubscriptionOperation.js

@@ -124,4 +124,4 @@ ConnectToPersistentSubscriptionOperation.prototype.notifyEventsFailed = function
   this._enqueueSend(pkg);
 };
 
-module.exports = ConnectToPersistentSubscriptionOperation;
+module.exports = ConnectToPersistentSubscriptionOperation;

src/clientOperations/createPersistentSubscriptionOperation.js

@@ -1,5 +1,4 @@
 var util = require('util');
-var uuid = require('uuid');
 
 var ensure = require('../common/utils/ensure');
 var OperationBase = require('../clientOperations/operationBase');
@@ -84,4 +83,4 @@ CreatePersistentSubscriptionOperation.prototype.toString = function() {
   return util.format("Stream: %s, Group Name: %s", this._stream, this._groupName);
 };
 
-module.exports = CreatePersistentSubscriptionOperation;
+module.exports = CreatePersistentSubscriptionOperation;

src/clientOperations/deletePersistentSubscriptionOperation.js

@@ -1,7 +1,5 @@
 var util = require('util');
-var uuid = require('uuid');
 
-var ensure = require('../common/utils/ensure');
 var OperationBase = require('../clientOperations/operationBase');
 var TcpCommand = require('../systemData/tcpCommand');
 var ClientMessage = require('../messages/clientMessage');
@@ -55,4 +53,4 @@ DeletePersistentSubscriptionOperation.prototype.toString = function() {
   return util.format("Stream: %s, Group Name: %s", this._stream, this._groupName);
 };
 
-module.exports = DeletePersistentSubscriptionOperation;
+module.exports = DeletePersistentSubscriptionOperation;

src/clientOperations/deleteStreamOperation.js

@@ -1,5 +1,4 @@
 var util = require('util');
-var uuid = require('uuid');
 
 var TcpCommand = require('../systemData/tcpCommand');
 var InspectionDecision = require('../systemData/inspectionDecision');

src/clientOperations/operationBase.js

@@ -42,10 +42,11 @@ OperationBase.prototype._succeed = function() {
   if (!this._completed) {
     this._completed = true;
 
-    if (this._response)
+    if (this._response) {
       this._cb(null, this._transformResponse(this._response));
-    else
+    } else {
       this._cb(new Error("No result."))
+    }
   }
 };
 
@@ -130,8 +131,7 @@ OperationBase.prototype._inspectNotHandled = function(pkg)
 
 OperationBase.prototype._inspectUnexpectedCommand = function(pkg, expectedCommand)
 {
-  if (pkg.command === expectedCommand)
-    throw new Error("Command shouldn't be " + TcpCommand.getName(pkg.command));
+  if (pkg.command === expectedCommand) throw new Error("Command shouldn't be " + TcpCommand.getName(pkg.command));
 
   this.log.error("Unexpected TcpCommand received.\n"
       + "Expected: %s, Actual: %s, Flags: %s, CorrelationId: %s\n"
@@ -145,4 +145,4 @@ OperationBase.prototype._inspectUnexpectedCommand = function(pkg, expectedComman
 };
 
 
-module.exports = OperationBase;
+module.exports = OperationBase;

src/clientOperations/readAllEventsBackwardOperation.js

@@ -1,5 +1,4 @@
 var util = require('util');
-var uuid = require('uuid');
 
 var TcpCommand = require('../systemData/tcpCommand');
 var ClientMessage = require('../messages/clientMessage');
@@ -65,4 +64,4 @@ ReadAllEventsBackwardOperation.prototype.toString = function() {
       this._position, this._maxCount, this._resolveLinkTos, this._requireMaster);
 };
 
-module.exports = ReadAllEventsBackwardOperation;
+module.exports = ReadAllEventsBackwardOperation;

src/clientOperations/readAllEventsForwardOperation.js

@@ -1,5 +1,4 @@
 var util = require('util');
-var uuid = require('uuid');
 
 var TcpCommand = require('../systemData/tcpCommand');
 var ClientMessage = require('../messages/clientMessage');
@@ -65,4 +64,4 @@ ReadAllEventsForwardOperation.prototype.toString = function() {
       this._position, this._maxCount, this._resolveLinkTos, this._requireMaster);
 };
 
-module.exports = ReadAllEventsForwardOperation;
+module.exports = ReadAllEventsForwardOperation;

src/clientOperations/readEventOperation.js

@@ -59,7 +59,6 @@ ReadEventOperation.prototype._transformResponse = function(response) {
   return new results.EventReadResult(convert(response.result), this._stream, this._eventNumber, response.event);
 };
 
-
 function convert(result)
 {
   switch (result)
@@ -82,4 +81,4 @@ ReadEventOperation.prototype.toString = function() {
       this._stream, this._eventNumber, this._resolveLinkTos, this._requireMaster);
 };
 
-module.exports = ReadEventOperation;
+module.exports = ReadEventOperation;

src/clientOperations/readStreamEventsBackwardOperation.js

@@ -1,5 +1,4 @@
 var util = require('util');
-var uuid = require('uuid');
 
 var TcpCommand = require('../systemData/tcpCommand');
 var ClientMessage = require('../messages/clientMessage');
@@ -77,4 +76,4 @@ ReadStreamEventsBackwardOperation.prototype.toString = function() {
       this._stream, this._fromEventNumber, this._maxCount, this._resolveLinkTos, this._requireMaster);
 };
 
-module.exports = ReadStreamEventsBackwardOperation;
+module.exports = ReadStreamEventsBackwardOperation;

src/clientOperations/readStreamEventsForwardOperation.js

@@ -1,5 +1,4 @@
 var util = require('util');
-var uuid = require('uuid');
 
 var TcpCommand = require('../systemData/tcpCommand');
 var ClientMessage = require('../messages/clientMessage');
@@ -77,4 +76,4 @@ ReadStreamEventsForwardOperation.prototype.toString = function() {
       this._stream, this._fromEventNumber, this._maxCount, this._resolveLinkTos, this._requireMaster);
 };
 
-module.exports = ReadStreamEventsForwardOperation;
+module.exports = ReadStreamEventsForwardOperation;

src/clientOperations/startTransactionOperation.js

@@ -1,12 +1,10 @@
 var util = require('util');
-var uuid = require('uuid');
 
 var TcpCommand = require('../systemData/tcpCommand');
 var InspectionDecision = require('../systemData/inspectionDecision');
 var InspectionResult = require('./../systemData/inspectionResult');
 var ClientMessage = require('../messages/clientMessage');
 var EventStoreTransaction = require('../eventStoreTransaction');
-var results = require('../results');
 var AccessDeniedError = require('../errors/accessDeniedError');
 var WrongExpectedVersionError = require('../errors/wrongExpectedVersionError');
 var StreamDeletedError = require('../errors/streamDeletedError');
@@ -68,4 +66,4 @@ StartTransactionOperation.prototype.toString = function() {
   return util.format("Stream: %s, ExpectedVersion: %d", this._stream, this._expectedVersion);
 };
 
-module.exports = StartTransactionOperation;
+module.exports = StartTransactionOperation;

src/clientOperations/subscriptionOperation.js

@@ -1,5 +1,4 @@
 var util = require('util');
-var uuid = require('uuid');
 
 var TcpCommand = require('../systemData/tcpCommand');
 var TcpFlags = require('../systemData/tcpFlags');
@@ -46,8 +45,7 @@ SubscriptionOperation.prototype._enqueueSend = function(pkg) {
 SubscriptionOperation.prototype.subscribe = function(correlationId, connection) {
   if (connection === null) throw new TypeError("connection is null.");
 
-  if (this._subscription !== null || this._unsubscribed)
-    return false;
+  if (this._subscription !== null || this._unsubscribed) return false;
 
   this._correlationId = correlationId;
   connection.enqueueSend(this._createSubscriptionPackage());
@@ -76,9 +74,7 @@ SubscriptionOperation.prototype.inspectPackage = function(pkg) {
   try
   {
     var result = this._inspectPackage(pkg);
-    if (result !== null) {
-      return result;
-    }
+    if (result !== null) return result;
 
     switch (pkg.command)
     {
@@ -128,8 +124,9 @@ SubscriptionOperation.prototype.inspectPackage = function(pkg) {
 
       case TcpCommand.NotHandled:
       {
-        if (this._subscription !== null)
+        if (this._subscription !== null) {
           throw new Error("NotHandled command appeared while we already subscribed.");
+        }
 
         var message = ClientMessage.NotHandled.decode(pkg.data.toBuffer());
         switch (message.reason)
@@ -172,8 +169,7 @@ SubscriptionOperation.prototype.connectionClosed = function() {
 };
 
 SubscriptionOperation.prototype.timeOutSubscription = function() {
-  if (this._subscription !== null)
-    return false;
+  if (this._subscription !== null) return false;
   this.dropSubscription(SubscriptionDropReason.SubscribingError, null);
   return true;
 };
@@ -182,9 +178,10 @@ SubscriptionOperation.prototype.dropSubscription = function(reason, err, connect
   if (!this._unsubscribed)
   {
     this._unsubscribed = true;
-    if (this._verboseLogging)
+    if (this._verboseLogging) {
       this._log.debug("Subscription %s to %s: closing subscription, reason: %s, exception: %s...",
-          this._correlationId, this._streamId || "<all>", reason, err);
+        this._correlationId, this._streamId || "<all>", reason, err);
+    }
 
     if (reason !== SubscriptionDropReason.UserInitiated && this._subscription === null)
     {
@@ -193,24 +190,31 @@ SubscriptionOperation.prototype.dropSubscription = function(reason, err, connect
       return;
     }
 
-    if (reason === SubscriptionDropReason.UserInitiated && this._subscription !== null && connection !== null)
+    if (reason === SubscriptionDropReason.UserInitiated && this._subscription !== null && connection !== null) {
       connection.enqueueSend(this._createUnsubscriptionPackage());
+    }
 
     var self = this;
-    if (this._subscription !== null)
-      this._executeAction(function() { self._subscriptionDropped(self._subscription, reason, err); });
+    if (this._subscription !== null) {
+      this._executeAction(function () {
+        self._subscriptionDropped(self._subscription, reason, err);
+      });
+    }
   }
 };
 
 SubscriptionOperation.prototype._confirmSubscription = function(lastCommitPosition, lastEventNumber) {
-  if (lastCommitPosition < -1)
+  if (lastCommitPosition < -1) {
     throw new Error(util.format("Invalid lastCommitPosition %s on subscription confirmation.", lastCommitPosition));
-  if (this._subscription !== null)
+  }
+  if (this._subscription !== null) {
     throw new Error("Double confirmation of subscription.");
+  }
 
-  if (this._verboseLogging)
+  if (this._verboseLogging) {
     this._log.debug("Subscription %s to %s: subscribed at CommitPosition: %d, EventNumber: %d.",
-        this._correlationId, this._streamId || "<all>", lastCommitPosition, lastEventNumber);
+      this._correlationId, this._streamId || "<all>", lastCommitPosition, lastEventNumber);
+  }
 
   this._subscription = this._createSubscriptionObject(lastCommitPosition, lastEventNumber);
   this._cb(null, this._subscription);
@@ -221,15 +225,15 @@ SubscriptionOperation.prototype._createSubscriptionObject = function(lastCommitP
 };
 
 SubscriptionOperation.prototype._onEventAppeared = function(e) {
-  if (this._unsubscribed)
-    return;
+  if (this._unsubscribed) return;
 
   if (this._subscription === null) throw new Error("Subscription not confirmed, but event appeared!");
 
-  if (this._verboseLogging)
+  if (this._verboseLogging) {
     this._log.debug("Subscription %s to %s: event appeared (%s, %d, %s @ %s).",
-        this._correlationId, this._streamId || "<all>",
-        e.originalStreamId, e.originalEventNumber, e.originalEvent.eventType, e.originalPosition);
+      this._correlationId, this._streamId || "<all>",
+      e.originalStreamId, e.originalEventNumber, e.originalEvent.eventType, e.originalPosition);
+  }
 
   var self = this;
   this._executeAction(function() { return self._eventAppeared(self._subscription, e); });

src/clientOperations/transactionalWriteOperation.js

@@ -64,5 +64,4 @@ TransactionalWriteOperation.prototype.toString = function() {
   return util.format("TransactionId: %s", this._transactionId);
 };
 
-module.exports = TransactionalWriteOperation;
-
+module.exports = TransactionalWriteOperation;

src/clientOperations/updatePersistentSubscriptionOperation.js

@@ -1,5 +1,4 @@
 var util = require('util');
-var uuid = require('uuid');
 
 var ensure = require('../common/utils/ensure');
 var OperationBase = require('../clientOperations/operationBase');
@@ -84,4 +83,4 @@ UpdatePersistentSubscriptionOperation.prototype.toString = function() {
   return util.format("Stream: %s, Group Name: %s", this._stream, this._groupName);
 };
 
-module.exports = UpdatePersistentSubscriptionOperation;
+module.exports = UpdatePersistentSubscriptionOperation;

src/common/bufferSegment.js

@@ -19,8 +19,7 @@ BufferSegment.prototype.toString = function() {
 };
 
 BufferSegment.prototype.toBuffer = function() {
-  if (this.offset === 0 && this.count === this.buffer.length)
-      return this.buffer;
+  if (this.offset === 0 && this.count === this.buffer.length) return this.buffer;
   return this.buffer.slice(this.offset, this.offset + this.count);
 };
 

src/common/hash.js

@@ -39,4 +39,4 @@ Hash.prototype.remove = function(key) {
 };
 
 
-module.exports = Hash;
+module.exports = Hash;

src/common/systemEventTypes.js

@@ -1,5 +1,5 @@
-const SystemEventTypes = {
+const SystemEventTypes = Object.freeze({
   StreamMetadata: '$metadata'
-};
+});
 
-module.exports = SystemEventTypes;
+module.exports = SystemEventTypes;

src/common/systemMetadata.js

@@ -1,4 +1,4 @@
-const SystemMetadata = {
+const SystemMetadata = Object.freeze({
   maxAge: '$maxAge',
   maxCount: '$maxCount',
   truncateBefore: '$tb',
@@ -11,7 +11,6 @@ const SystemMetadata = {
   aclMetaWrite: '$mw',
   userStreamAcl: '$userStreamAcl',
   systemStreamAcl: '$systemStreamAcl'
-};
-Object.freeze(SystemMetadata);
+});
 
 module.exports = SystemMetadata;

src/common/systemStreams.js

@@ -1,6 +1,6 @@
-module.exports.metastreamOf = function(stream) {
+exports.metastreamOf = function(stream) {
   return '$$' + stream;
 };
-module.exports.isMetastream = function(stream) {
+exports.isMetastream = function(stream) {
   return stream.indexOf('$$') === 0;
 };

src/common/utils/ensure.js

@@ -1,20 +1,16 @@
 var Long = require('long');
 
 module.exports.notNullOrEmpty = function(value, name) {
-  if (value === null)
-    throw new TypeError(name + " should not be null.");
-  if (value === '')
-    throw new Error(name + " should not be empty.");
+  if (value === null) throw new TypeError(name + " should not be null.");
+  if (value === '') throw new Error(name + " should not be empty.");
 };
 
 module.exports.notNull = function(value, name) {
-  if (value === null)
-    throw new TypeError(name + " should not be null.");
+  if (value === null) throw new TypeError(name + " should not be null.");
 };
 
 function isInteger(value, name) {
-  if (typeof value !== 'number' || value % 1 !== 0)
-    throw new TypeError(name + " should be an integer.");
+  if (typeof value !== 'number' || value % 1 !== 0) throw new TypeError(name + " should be an integer.");
 }
 module.exports.isInteger = isInteger;
 
@@ -27,24 +23,23 @@ module.exports.isLongOrInteger = function(value, name) {
 };
 
 module.exports.isArrayOf = function(expectedType, value, name) {
-  if (!Array.isArray(value))
-    throw new TypeError(name + " should be an array.");
-  if (!value.every(function(x) { return x instanceof expectedType; }))
+  if (!Array.isArray(value)) throw new TypeError(name + " should be an array.");
+  if (!value.every(function(x) { return x instanceof expectedType; })) {
     throw new TypeError([name, " should be an array of ", expectedType.name, "."].join(""));
+  }
 };
 
 module.exports.isTypeOf = function(expectedType, value, name, nullAllowed) {
   if (nullAllowed && value === null) return;
-  if (!(value instanceof expectedType))
-    throw new TypeError([name, " should be of type '", expectedType.name, "'", nullAllowed ? " or null": "", "."].join(""));
+  if (!(value instanceof expectedType)) {
+    throw new TypeError([name, " should be of type '", expectedType.name, "'", nullAllowed ? " or null" : "", "."].join(""));
+  }
 };
 
 module.exports.positive = function(value, name) {
-  if (value <= 0)
-    throw new Error(name + " should be positive.");
+  if (value <= 0) throw new Error(name + " should be positive.");
 };
 
 module.exports.nonNegative = function(value, name) {
-  if (value < 0)
-    throw new Error(name + " should be non-negative.");
+  if (value < 0) throw new Error(name + " should be non-negative.");
 };

src/core/clusterDnsEndPointDiscoverer.js

@@ -34,18 +34,19 @@ ClusterDnsEndPointDiscoverer.prototype.discover = function(failedTcpEndPoint) {
   function discover(resolve, reject) {
     self._discoverEndPoint(failedTcpEndPoint)
       .then(function (endPoints) {
-        if (!endPoints)
+        if (!endPoints) {
           self._log.info(util.format("Discovering attempt %d/%d failed: no candidate found.", attempt, self._maxDiscoverAttempts));
+        }
         return endPoints;
       })
       .catch(function (exc) {
         self._log.info(util.format("Discovering attempt %d/%d failed with error: %s.\n%s", attempt, self._maxDiscoverAttempts, exc, exc.stack));
       })
       .then(function (endPoints) {
-        if (endPoints)
-          return resolve(endPoints);
-        if (attempt++ === self._maxDiscoverAttempts)
+        if (endPoints) return resolve(endPoints);
+        if (attempt++ === self._maxDiscoverAttempts) {
           return reject(new Error('Failed to discover candidate in ' + self._maxDiscoverAttempts + ' attempts.'));
+        }
         setTimeout(discover, 500, resolve, reject);
       });
   }
@@ -74,8 +75,7 @@ ClusterDnsEndPointDiscoverer.prototype._discoverEndPoint = function (failedTcpEn
           if (endPoints) return endPoints;
           return self._tryGetGossipFrom(gossipCandidates[j++])
             .then(function (gossip) {
-              if (!gossip || !gossip.members || gossip.members.length === 0)
-                return;
+              if (!gossip || !gossip.members || gossip.members.length === 0) return;
               var bestNode = self._tryDetermineBestNode(gossip.members);
               if (bestNode) {
                 self._oldGossip = gossip.members;
@@ -105,10 +105,11 @@ ClusterDnsEndPointDiscoverer.prototype._arrangeGossipCandidates = function (memb
   var j = members.length;
   for (var k = 0; k < members.length; ++k)
   {
-    if (members[k].state === 'Manager')
+    if (members[k].state === 'Manager') {
       result[--j] = new GossipSeed({host: members[k].externalHttpIp, port: members[k].externalHttpPort});
-    else
+    } else {
       result[++i] = new GossipSeed({host: members[k].externalHttpIp, port: members[k].externalHttpPort});
+    }
   }
   this._randomShuffle(result, 0, i); // shuffle nodes
   this._randomShuffle(result, j, members.length - 1); // shuffle managers
@@ -122,8 +123,7 @@ ClusterDnsEndPointDiscoverer.prototype._getGossipCandidatesFromDns = function ()
       var endpoints = self._gossipSeeds;
       self._randomShuffle(endpoints, 0, endpoints.length - 1);
       resolve(endpoints);
-    }
-    else {
+    } else {
       const dnsOptions = {
         family: 4,
         hints: dns.ADDRCONFIG | dns.V4MAPPED,
@@ -192,7 +192,7 @@ ClusterDnsEndPointDiscoverer.prototype._tryGetGossipFrom = function (endPoint) {
   });
 };
 
-const VNodeStates = {
+const VNodeStates = Object.freeze({
   'Initializing': 0,
   'Unknown': 1,
   'PreReplica': 2,
@@ -204,7 +204,7 @@ const VNodeStates = {
   'Manager': 8,
   'ShuttingDown': 9,
   'Shutdown': 10
-};
+});
 
 ClusterDnsEndPointDiscoverer.prototype._tryDetermineBestNode = function (members) {
   var notAllowedStates = [
@@ -240,8 +240,7 @@ function rndNext(min, max) {
 }
 
 ClusterDnsEndPointDiscoverer.prototype._randomShuffle = function (arr, i, j) {
-  if (i >= j)
-    return;
+  if (i >= j) return;
   for (var k = i; k <= j; ++k)
   {
     var index = rndNext(k, j + 1);

src/core/eventStoreConnectionLogicHandler.js

@@ -17,14 +17,14 @@ var TcpCommand = require('../systemData/tcpCommand');
 var TcpFlags = require('../systemData/tcpFlags');
 var InspectionDecision = require('../systemData/inspectionDecision');
 
-const ConnectionState = {
+const ConnectionState = Object.freeze({
   Init: 'init',
   Connecting: 'connecting',
   Connected: 'connected',
   Closed: 'closed'
-};
+});
 
-const ConnectingPhase = {
+const ConnectingPhase = Object.freeze({
   Invalid: 'invalid',
   Reconnecting: 'reconnecting',
   EndPointDiscovery: 'endpointDiscovery',
@@ -32,7 +32,7 @@ const ConnectingPhase = {
   Authentication: 'authentication',
   Identification: 'identification',
   Connected: 'connected'
-};
+});
 
 const TimerPeriod = 200;
 const TimerTickMessage = new messages.TimerTickMessage();
@@ -187,8 +187,7 @@ EventStoreConnectionLogicHandler.prototype._closeConnection = function(reason, e
 
   this._logInfo("Closed. Reason: %s", reason);
 
-  if (error)
-      this.emit('error', error);
+  if (error) this.emit('error', error);
 
   this.emit('closed', reason);
 };
@@ -205,7 +204,7 @@ EventStoreConnectionLogicHandler.prototype._closeTcpConnection = function(reason
   this._connection = null;
 };
 
-var _nextSeqNo = -1;
+var _nextSeqNo = 0;
 function createOperationItem(operation, maxRetries, timeout) {
   var operationItem = {
     seqNo: _nextSeqNo++,
@@ -283,10 +282,11 @@ EventStoreConnectionLogicHandler.prototype._startSubscription = function(msg) {
           this._state === ConnectionState.Connected ? "fire" : "enqueue",
           operation.constructor.name, operation, msg.maxRetries, msg.timeout);
       var subscription = createSubscriptionItem(operation, msg.maxRetries, msg.timeout);
-      if (this._state === ConnectionState.Connecting)
+      if (this._state === ConnectionState.Connecting) {
         this._subscriptions.enqueueSubscription(subscription);
-      else
+      } else {
         this._subscriptions.startSubscription(subscription, this._connection);
+      }
       break;
     case ConnectionState.Closed:
       msg.cb(new Error("Connection closed. Connection: " + this._esConnection.connectionName));
@@ -312,10 +312,11 @@ EventStoreConnectionLogicHandler.prototype._startPersistentSubscription = functi
           this._state === ConnectionState.Connected ? "fire" : "enqueue",
           operation.constructor.name, operation, msg.maxRetries, msg.timeout);
       var subscription = createSubscriptionItem(operation, msg.maxRetries, msg.timeout);
-      if (this._state === ConnectionState.Connecting)
+      if (this._state === ConnectionState.Connecting) {
         this._subscriptions.enqueueSubscription(subscription);
-      else
+      } else {
         this._subscriptions.startSubscription(subscription, this._connection);
+      }
       break;
     case ConnectionState.Closed:
       msg.cb(new Error("Connection closed. " + this._esConnection.connectionName));
@@ -561,8 +562,9 @@ EventStoreConnectionLogicHandler.prototype._handleTcpPackage = function(connecti
       default:
         throw new Error("Unknown InspectionDecision: " + result.decision);
     }
-    if (this._state === ConnectionState.Connected)
+    if (this._state === ConnectionState.Connected) {
       this._operations.scheduleWaitingOperations(connection);
+    }
 
     return;
   }
@@ -609,8 +611,7 @@ EventStoreConnectionLogicHandler.prototype._reconnectTo = function(endPoints) {
     return;
   }
 
-  if (this._state !== ConnectionState.Connected || this._connection.remoteEndPoint === endPoint)
-    return;
+  if (this._state !== ConnectionState.Connected || this._connection.remoteEndPoint === endPoint) return;
 
   var msg = util.format("EventStoreConnection '%s': going to reconnect to [%j]. Current endpoint: [%j, L%j].",
       this._esConnection.connectionName, endPoint, this._connection.remoteEndPoint, this._connection.localEndPoint);
@@ -627,30 +628,26 @@ EventStoreConnectionLogicHandler.prototype._timerTick = function() {
   {
     case ConnectionState.Init: break;
     case ConnectionState.Connecting:
-      if (this._connectingPhase === ConnectingPhase.Reconnecting && (Date.now() - this._reconnInfo.timeStamp) >= this._settings.reconnectionDelay)
-      {
+      if (this._connectingPhase === ConnectingPhase.Reconnecting && (Date.now() - this._reconnInfo.timeStamp) >= this._settings.reconnectionDelay) {
         this._logDebug("TimerTick checking reconnection...");
 
         this._reconnInfo = {reconnectionAttempt: this._reconnInfo.reconnectionAttempt + 1, timeStamp: Date.now()};
-        if (this._settings.maxReconnections >= 0 && this._reconnInfo.reconnectionAttempt > this._settings.maxReconnections)
+        if (this._settings.maxReconnections >= 0 && this._reconnInfo.reconnectionAttempt > this._settings.maxReconnections) {
           this._closeConnection("Reconnection limit reached.");
-        else
-        {
+        } else {
           this.emit('reconnecting', {});
           this._discoverEndpoint(null);
         }
-      }
-      else if (this._connectingPhase === ConnectingPhase.Authentication && (Date.now() - this._authInfo.timeStamp) >= this._settings.operationTimeout)
-      {
+      } else if (this._connectingPhase === ConnectingPhase.Authentication && (Date.now() - this._authInfo.timeStamp) >= this._settings.operationTimeout) {
         this.emit('authenticationFailed', "Authentication timed out.");
         if (this._clientVersion === 1) {
           this._goToIdentifiedState();
         } else {
           this._goToConnectedState();
         }
-      }
-      else if (this._connectingPhase === ConnectingPhase.Authentication || this._connectingPhase === ConnectingPhase.Connected)
+      } else if (this._connectingPhase === ConnectingPhase.Authentication || this._connectingPhase === ConnectingPhase.Connected) {
         this._manageHeartbeats();
+      }
       break;
     case ConnectionState.Connected:
       // operations timeouts are checked only if connection is established and check period time passed
@@ -677,8 +674,7 @@ EventStoreConnectionLogicHandler.prototype._manageHeartbeats = function() {
   if (this._connection === null) return;
 
   var timeout = this._heartbeatInfo.isIntervalStage ? this._settings.heartbeatInterval : this._settings.heartbeatTimeout;
-  if ((Date.now() - this._heartbeatInfo.timeStamp) < timeout)
-    return;
+  if ((Date.now() - this._heartbeatInfo.timeStamp) < timeout) return;
 
   var packageNumber = this._packageNumber;
   if (this._heartbeatInfo.lastPackageNumber !== packageNumber)
@@ -711,15 +707,17 @@ EventStoreConnectionLogicHandler.prototype._manageHeartbeats = function() {
 EventStoreConnectionLogicHandler.prototype._logDebug = function(message) {
   if (!this._settings.verboseLogging) return;
 
-  if (arguments.length > 1)
-      message = util.format.apply(util, Array.prototype.slice.call(arguments));
+  if (arguments.length > 1) {
+    message = util.format.apply(util, Array.prototype.slice.call(arguments));
+  }
 
   this._settings.log.debug("EventStoreConnection '%s': %s", this._esConnection.connectionName, message);
 };
 
 EventStoreConnectionLogicHandler.prototype._logInfo = function(message){
-  if (arguments.length > 1)
+  if (arguments.length > 1) {
     message = util.format.apply(util, Array.prototype.slice.call(arguments));
+  }
 
   this._settings.log.info("EventStoreConnection '%s': %s", this._esConnection.connectionName, message);
 };

src/core/messages.js

@@ -1,5 +1,4 @@
 var util = require('util');
-var ensure = require('../common/utils/ensure');
 
 function Message() {
 }

src/core/operationsManager.js

@@ -110,8 +110,7 @@ OperationsManager.prototype.checkTimeoutsAndRetry = function(connection) {
 };
 
 OperationsManager.prototype.scheduleOperationRetry = function(operation) {
-  if (!this.removeOperation(operation))
-    return;
+  if (!this.removeOperation(operation)) return;
 
   this._logDebug("ScheduleOperationRetry for %s.", operation);
   if (operation.maxRetries >= 0 && operation.retryCount >= operation.maxRetries)
@@ -166,10 +165,11 @@ OperationsManager.prototype.scheduleOperation = function(operation, connection)
 OperationsManager.prototype._logDebug = function(message) {
   if (!this._settings.verboseLogging) return;
 
-  if (arguments.length > 1)
+  if (arguments.length > 1) {
     message = util.format.apply(util, Array.prototype.slice.call(arguments));
+  }
 
   this._settings.log.debug("EventStoreConnection '%s': %s.", this._connectionName, message);
 };
 
-module.exports = OperationsManager;
+module.exports = OperationsManager;

src/core/simpleQueuedHandler.js

@@ -1,8 +1,6 @@
 function typeName(t) {
-  if (typeof t === 'function')
-    return t.name;
-  if (typeof t === 'object')
-    return t.constructor.name;
+  if (typeof t === 'function') return t.name;
+  if (typeof t === 'object') return t.constructor.name;
   throw new TypeError('type must be a function or object, not ' + typeof t);
 }
 
@@ -36,8 +34,7 @@ SimpleQueuedHandler.prototype._processQueue = function() {
   while(message) {
     var typeId = typeName(message);
     var handler = this._handlers[typeId];
-    if (!handler)
-        throw new Error("No handler registered for message " + typeId);
+    if (!handler) throw new Error("No handler registered for message " + typeId);
     setImmediate(handler, message);
     message = this._messages.shift();
   }

src/errors/projectionCommandFailedError.js

@@ -7,4 +7,4 @@ function ProjectionCommandFailedError(httpStatusCode, message) {
 }
 util.inherits(ProjectionCommandFailedError, Error);
 
-module.exports = ProjectionCommandFailedError;
+module.exports = ProjectionCommandFailedError;

src/eventData.js

@@ -1,5 +1,3 @@
-var uuid = require('uuid');
-
 const uuidRegex = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
 function isValidId(id) {
   if (typeof id !== 'string') return false;

src/eventStoreAllCatchUpSubscription.js

@@ -45,8 +45,7 @@ EventStoreAllCatchUpSubscription.prototype._readEventsTill = function(
               });
         })
         .then(function(done) {
-          if (done || self._shouldStop)
-              return;
+          if (done || self._shouldStop) return;
           return readNext();
         });
   }
@@ -69,10 +68,11 @@ EventStoreAllCatchUpSubscription.prototype._tryProcess = function(e) {
     this._lastProcessedPosition = e.originalPosition;
     processed = true;
   }
-  if (this._verbose)
+  if (this._verbose) {
     this._log.debug("Catch-up Subscription to %s: %s event (%s, %d, %s @ %s).",
-        this.streamId || '<all>', processed ? "processed" : "skipping",
-        e.originalEvent.eventStreamId, e.originalEvent.eventNumber, e.originalEvent.eventType, e.originalPosition);
+      this.streamId || '<all>', processed ? "processed" : "skipping",
+      e.originalEvent.eventStreamId, e.originalEvent.eventNumber, e.originalEvent.eventType, e.originalPosition);
+  }
   return (promise && promise.then) ? promise : Promise.resolve();
 };
 

src/eventStoreCatchUpSubscription.js

@@ -1,7 +1,6 @@
 var util = require('util');
 
 var SubscriptionDropReason = require('./subscriptionDropReason');
-var results = require('./results');
 
 const DefaultReadBatchSize = 500;
 const DefaultMaxPushQueueSize = 10000;
@@ -68,9 +67,9 @@ function EventStoreCatchUpSubscription(
 
   var self = this;
   this._onReconnect = function() {
-    if (self._verbose) self._log.debug("Catch-up Subscription to %s: recovering after reconnection.", self._streamId || '<all>');
     if (self._verbose) self._log.debug("Catch-up Subscription to %s: unhooking from connection.Connected.", self._streamId || '<all>');
     self._connection.removeListener('connected', self._onReconnect);
+    if (self._verbose) self._log.debug("Catch-up Subscription to %s: recovering after reconnection.", self._streamId || '<all>');
     self._runSubscription();
   }
 }
@@ -133,10 +132,11 @@ EventStoreCatchUpSubscription.prototype._runSubscription = function() {
       .then(function() {
         if (self._shouldStop) return;
         if (self._verbose) self._log.debug("Catch-up Subscription to %s: subscribing...", logStreamName);
-        if (self._streamId === '')
+        if (self._streamId === '') {
           return self._connection.subscribeToAll(self._resolveLinkTos, self._enqueuePushedEvent.bind(self), self._serverSubscriptionDropped.bind(self), self._userCredentials);
-        else
+        } else {
           return self._connection.subscribeToStream(self._streamId, self._resolveLinkTos, self._enqueuePushedEvent.bind(self), self._serverSubscriptionDropped.bind(self), self._userCredentials);
+        }
       })
       .then(function(subscription) {
         if (subscription === undefined) return;
@@ -155,12 +155,13 @@ EventStoreCatchUpSubscription.prototype._runSubscription = function() {
           return;
         }
         if (self._verbose) self._log.debug("Catch-up Subscription to %s: processing live events...", logStreamName);
-        if (self._liveProcessingStarted)
+        if (self._liveProcessingStarted) {
           try {
             self._liveProcessingStarted(self);
-          } catch(e) {
+          } catch (e) {
             self._log.error(e, "Catch-up Subscription to %s: liveProcessingStarted callback failed.", logStreamName);
           }
+        }
         if (self._verbose) self._log.debug("Catch-up Subscription to %s: hooking to connection.Connected", logStreamName);
         self._connection.on('connected', self._onReconnect);
         self._allowProcessing = true;
@@ -169,10 +170,11 @@ EventStoreCatchUpSubscription.prototype._runSubscription = function() {
 };
 
 EventStoreCatchUpSubscription.prototype._enqueuePushedEvent = function(subscription, e) {
-  if (this._verbose)
+  if (this._verbose) {
     this._log.debug("Catch-up Subscription to %s: event appeared (%s, %d, %s @ %s).",
-        this._streamId || '<all>',
-        e.originalStreamId, e.originalEventNumber, e.originalEvent.eventType, e.originalPosition);
+      this._streamId || '<all>',
+      e.originalStreamId, e.originalEventNumber, e.originalEvent.eventType, e.originalPosition);
+  }
 
   if (this._liveQueue.length >= this.maxPushQueueSize)
   {
@@ -183,8 +185,7 @@ EventStoreCatchUpSubscription.prototype._enqueuePushedEvent = function(subscript
 
   this._liveQueue.push(e);
 
-  if (this._allowProcessing)
-    this._ensureProcessingPushQueue();
+  if (this._allowProcessing) this._ensureProcessingPushQueue();
 };
 
 EventStoreCatchUpSubscription.prototype._serverSubscriptionDropped = function(subscription, reason, err) {
@@ -196,8 +197,7 @@ EventStoreCatchUpSubscription.prototype._enqueueSubscriptionDropNotification = f
   if (this._dropData) return;
   this._dropData = {reason: reason, error: error};
   this._liveQueue.push(new DropSubscriptionEvent());
-  if (this._allowProcessing)
-    this._ensureProcessingPushQueue();
+  if (this._allowProcessing) this._ensureProcessingPushQueue();
 };
 
 EventStoreCatchUpSubscription.prototype._ensureProcessingPushQueue = function() {
@@ -244,18 +244,19 @@ EventStoreCatchUpSubscription.prototype._dropSubscription = function(reason, err
   if (this._isDropped) return;
 
   this._isDropped = true;
-  if (this._verbose)
+  if (this._verbose) {
     this._log.debug("Catch-up Subscription to %s: dropping subscription, reason: %s %s.",
-                    this._streamId || '<all>', reason, error);
+      this._streamId || '<all>', reason, error);
+  }
 
-  if (this._subscription)
-    this._subscription.unsubscribe();
-  if (this._subscriptionDropped)
+  if (this._subscription) this._subscription.unsubscribe();
+  if (this._subscriptionDropped) {
     try {
       this._subscriptionDropped(this, reason, error);
-    } catch(e) {
+    } catch (e) {
       this._log.error(e, "Catch-up Subscription to %s: subscriptionDropped callback failed.", this._streamId || '<all>');
     }
+  }
   this._stopped = true;
 };
 

src/eventStoreConnection.js

@@ -4,7 +4,7 @@ var ClusterDnsEndPointDiscoverer = require('./core/clusterDnsEndPointDiscoverer'
 var NoopLogger = require('./common/log/noopLogger');
 var ensure = require('./common/utils/ensure');
 
-var defaultConnectionSettings = {
+var defaultConnectionSettings = Object.freeze({
   log: new NoopLogger(),
   verboseLogging: false,
 
@@ -34,7 +34,7 @@ var defaultConnectionSettings = {
   maxDiscoverAttempts: 10,
   externalGossipPort: 0,
   gossipTimeout: 1000
-};
+});
 
 
 function merge(a,b) {
@@ -151,4 +151,4 @@ module.exports.create = function(settings, endPointOrGossipSeeds, connectionName
   if (typeof endPointOrGossipSeeds === 'object') return createFromTcpEndpoint(settings, endPointOrGossipSeeds, connectionName);
   if (typeof endPointOrGossipSeeds === 'string') return createFromStringEndpoint(settings, endPointOrGossipSeeds, connectionName);
   throw new TypeError('endPointOrGossipSeeds must be an object, a string or an array.');
-};
+};

src/eventStoreNodeConnection.js

@@ -140,8 +140,7 @@ EventStoreNodeConnection.prototype.appendToStream = function(stream, expectedVer
   ensure.notNullOrEmpty(stream, "stream");
   ensure.isLongOrInteger(expectedVersion, "expectedVersion");
   expectedVersion = Long.fromValue(expectedVersion);
-  if (!Array.isArray(events))
-    events = [events];
+  if (!Array.isArray(events)) events = [events];
   ensure.isArrayOf(EventData, events, "events");
   userCredentials = userCredentials || null;
 
@@ -413,8 +412,7 @@ EventStoreNodeConnection.prototype.subscribeToStream = function(
 ) {
   ensure.notNullOrEmpty(stream, "stream");
   ensure.isTypeOf(Function, eventAppeared, "eventAppeared");
-  if (subscriptionDropped)
-    ensure.isTypeOf(Function, subscriptionDropped, "subscriptionDropped");
+  if (subscriptionDropped) ensure.isTypeOf(Function, subscriptionDropped, "subscriptionDropped");
 
   var self = this;
   return new Promise(function(resolve,reject) {
@@ -641,8 +639,9 @@ EventStoreNodeConnection.prototype.setStreamMetadataRaw = function(
     stream, expectedMetastreamVersion, metadata, userCredentials
 ) {
   ensure.notNullOrEmpty(stream, "stream");
-  if (systemStreams.isMetastream(stream))
+  if (systemStreams.isMetastream(stream)) {
     throw new Error(util.format("Setting metadata for metastream '%s' is not supported.", stream));
+  }
   ensure.isLongOrInteger(expectedMetastreamVersion, "expectedMetastreamVersion");
   expectedMetastreamVersion = Long.fromValue(expectedMetastreamVersion);
   var self = this;
@@ -713,7 +712,7 @@ EventStoreNodeConnection.prototype._enqueueOperation = function(operation) {
   var message = new messages.StartOperationMessage(operation, self._settings.maxRetries, self._settings.operationTimeout);
   function tryEnqueue() {
     if (self._handler.totalOperationCount >= self._settings.maxQueueSize) {
-      setImmediate(tryEnqueue);
+      setTimeout(tryEnqueue, 0);
       return;
     }
     self._handler.enqueueMessage(message);
@@ -721,4 +720,4 @@ EventStoreNodeConnection.prototype._enqueueOperation = function(operation) {
   setImmediate(tryEnqueue)
 };
 
-module.exports = EventStoreNodeConnection;
+module.exports = EventStoreNodeConnection;

src/eventStorePersistentSubscriptionBase.js

@@ -56,8 +56,7 @@ EventStorePersistentSubscriptionBase.prototype.acknowledge = function(events) {
   ensure.notNull(events, "events");
 
   if (this._subscription === null) throw new Error("Invalid operation. Subscription is not active yet.");
-  if (!Array.isArray(events))
-    events = [events];
+  if (!Array.isArray(events)) events = [events];
   var ids = events.map(function(x) { return x.originalEvent.eventId; });
   this._subscription.notifyEventsProcessed(ids);
 };
@@ -73,8 +72,7 @@ EventStorePersistentSubscriptionBase.prototype.fail = function(events, action, r
   ensure.notNull(reason, "reason");
 
   if (this._subscription === null) throw new Error("Invalid operation. Subscription is not active yet.");
-  if (!Array.isArray(events))
-    events = [events];
+  if (!Array.isArray(events)) events = [events];
   var ids = events.map(function(x) { return x.originalEvent.eventId; });
   this._subscription.notifyEventsFailed(ids, action, reason);
 };
@@ -145,12 +143,12 @@ EventStorePersistentSubscriptionBase.prototype._processQueue = function() {
     return self._eventAppeared(self, ev);
   })
     .then(function() {
-      if(self._autoAck)
-        self._subscription.notifyEventsProcessed([ev.originalEvent.eventId]);
-      if (self._verbose)
+      if(self._autoAck) self._subscription.notifyEventsProcessed([ev.originalEvent.eventId]);
+      if (self._verbose) {
         self._log.debug("Persistent Subscription to %s: processed event (%s, %d, %s @ %d).",
           self._streamId, ev.originalEvent.eventStreamId, ev.originalEvent.eventNumber, ev.originalEvent.eventType,
           ev.originalEventNumber);
+      }
       return false;
     }, function(err) {
       //TODO GFY should we autonak here?
@@ -168,12 +166,12 @@ EventStorePersistentSubscriptionBase.prototype._dropSubscription = function(reas
   if (!this._isDropped)
   {
     this._isDropped = true;
-    if (this._verbose)
+    if (this._verbose) {
       this._log.debug("Persistent Subscription to %s: dropping subscription, reason: %s %s.",
-                      this._streamId, reason, error);
+        this._streamId, reason, error);
+    }
 
-    if (this._subscription !== null)
-      this._subscription.unsubscribe();
+    if (this._subscription !== null) this._subscription.unsubscribe();
     if (this._subscriptionDropped !== null) {
       try {
         this._subscriptionDropped(this, reason, error);
@@ -185,4 +183,4 @@ EventStorePersistentSubscriptionBase.prototype._dropSubscription = function(reas
   }
 };
 
-module.exports = EventStorePersistentSubscriptionBase;
+module.exports = EventStorePersistentSubscriptionBase;

src/eventStoreStreamCatchUpSubscription.js

@@ -49,19 +49,18 @@ EventStoreStreamCatchUpSubscription.prototype._readEventsTill = function(
                   .then(function()