diff --git a/.gitignore b/.gitignore
index be2e166c..8f61d2f7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
 node_modules
 test.js
 coverage
-dist
+# dist
 .nyc_output
diff --git a/.prettierrc b/.prettierrc
new file mode 100644
index 00000000..3f584f60
--- /dev/null
+++ b/.prettierrc
@@ -0,0 +1,4 @@
+{
+  "printWidth": 120,
+  "singleQuote": true
+}
diff --git a/dist/bind.d.ts b/dist/bind.d.ts
new file mode 100644
index 00000000..f761ddfe
--- /dev/null
+++ b/dist/bind.d.ts
@@ -0,0 +1 @@
+export declare function autoBind(obj: object): void;
diff --git a/dist/bind.js b/dist/bind.js
new file mode 100644
index 00000000..df71c05f
--- /dev/null
+++ b/dist/bind.js
@@ -0,0 +1,15 @@
+'use strict';
+Object.defineProperty(exports, "__esModule", { value: true });
+function isMethod(propertyName, value) {
+    return propertyName !== 'constructor' && typeof value === 'function';
+}
+function autoBind(obj) {
+    const propertyNames = Object.getOwnPropertyNames(obj.constructor.prototype);
+    propertyNames.forEach((propertyName) => {
+        const value = obj[propertyName];
+        if (isMethod(propertyName, value)) {
+            obj[propertyName] = value.bind(obj);
+        }
+    });
+}
+exports.autoBind = autoBind;
diff --git a/dist/consumer.d.ts b/dist/consumer.d.ts
new file mode 100644
index 00000000..1db39b8c
--- /dev/null
+++ b/dist/consumer.d.ts
@@ -0,0 +1,72 @@
+import * as SQS from 'aws-sdk/clients/sqs';
+import { EventEmitter } from 'events';
+declare type SQSMessage = SQS.Types.Message;
+export interface ConsumerOptions {
+    queueUrl?: string;
+    attributeNames?: string[];
+    messageAttributeNames?: string[];
+    stopped?: boolean;
+    concurrencyLimit?: number;
+    batchSize?: number;
+    visibilityTimeout?: number;
+    waitTimeSeconds?: number;
+    authenticationErrorTimeout?: number;
+    pollingWaitTimeMs?: number;
+    msDelayOnEmptyBatchSize?: number;
+    terminateVisibilityTimeout?: boolean;
+    sqs?: SQS;
+    region?: string;
+    handleMessageTimeout?: number;
+    handleMessage?(message: SQSMessage): Promise<void>;
+    handleMessageBatch?(messages: SQSMessage[], consumer: Consumer): Promise<void>;
+    pollingStartedInstrumentCallback?(eventData: object): void;
+    pollingFinishedInstrumentCallback?(eventData: object): void;
+    batchStartedInstrumentCallBack?(eventData: object): void;
+    batchFinishedInstrumentCallBack?(eventData: object): void;
+    batchFailedInstrumentCallBack?(eventData: object): void;
+}
+export declare class Consumer extends EventEmitter {
+    private queueUrl;
+    private handleMessage;
+    private handleMessageBatch;
+    private pollingStartedInstrumentCallback?;
+    private pollingFinishedInstrumentCallback?;
+    private batchStartedInstrumentCallBack?;
+    private batchFinishedInstrumentCallBack?;
+    private batchFailedInstrumentCallBack?;
+    private handleMessageTimeout;
+    private attributeNames;
+    private messageAttributeNames;
+    private stopped;
+    private concurrencyLimit;
+    private freeConcurrentSlots;
+    private batchSize;
+    private visibilityTimeout;
+    private waitTimeSeconds;
+    private authenticationErrorTimeout;
+    private pollingWaitTimeMs;
+    private msDelayOnEmptyBatchSize;
+    private terminateVisibilityTimeout;
+    private sqs;
+    constructor(options: ConsumerOptions);
+    readonly isRunning: boolean;
+    static create(options: ConsumerOptions): Consumer;
+    start(): void;
+    stop(): void;
+    setBatchSize(newBatchSize: number): void;
+    setConcurrencyLimit(newConcurrencyLimit: number): void;
+    setPollingWaitTimeMs(newPollingWaitTimeMs: number): void;
+    reportMessageFromBatchFinished(message: SQSMessage, error?: Error): Promise<void>;
+    private reportNumberOfMessagesReceived;
+    private handleSqsResponse;
+    private processMessage;
+    private receiveMessage;
+    private deleteMessage;
+    private executeHandler;
+    private terminateVisabilityTimeout;
+    private emitError;
+    private poll;
+    private processMessageBatch;
+    private reportConcurrencyUsage;
+}
+export {};
diff --git a/dist/consumer.js b/dist/consumer.js
new file mode 100644
index 00000000..00128cc0
--- /dev/null
+++ b/dist/consumer.js
@@ -0,0 +1,361 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const SQS = require("aws-sdk/clients/sqs");
+const Debug = require("debug");
+const crypto = require("crypto");
+const events_1 = require("events");
+const bind_1 = require("./bind");
+const errors_1 = require("./errors");
+const debug = Debug('sqs-consumer');
+const requiredOptions = [
+    'queueUrl',
+    // only one of handleMessage / handleMessagesBatch is required
+    'handleMessage|handleMessageBatch',
+];
+function generateUuid() {
+    return crypto.randomBytes(16).toString('hex');
+}
+function createTimeout(duration) {
+    let timeout;
+    const pending = new Promise((_, reject) => {
+        timeout = setTimeout(() => {
+            reject(new errors_1.TimeoutError());
+        }, duration);
+    });
+    return [timeout, pending];
+}
+function assertOptions(options) {
+    requiredOptions.forEach((option) => {
+        const possibilities = option.split('|');
+        if (!possibilities.find((p) => options[p])) {
+            throw new Error(`Missing SQS consumer option [ ${possibilities.join(' or ')} ].`);
+        }
+    });
+    if (options.batchSize > 10 || options.batchSize < 1) {
+        throw new Error('SQS batchSize option must be between 1 and 10.');
+    }
+}
+function isConnectionError(err) {
+    if (err instanceof errors_1.SQSError) {
+        return err.statusCode === 403 || err.code === 'CredentialsError' || err.code === 'UnknownEndpoint';
+    }
+    return false;
+}
+function isNonExistentQueueError(err) {
+    if (err instanceof errors_1.SQSError) {
+        return err.code === 'AWS.SimpleQueueService.NonExistentQueue';
+    }
+    return false;
+}
+function toSQSError(err, message) {
+    const sqsError = new errors_1.SQSError(message);
+    sqsError.code = err.code;
+    sqsError.statusCode = err.statusCode;
+    sqsError.region = err.region;
+    sqsError.retryable = err.retryable;
+    sqsError.hostname = err.hostname;
+    sqsError.time = err.time;
+    return sqsError;
+}
+function hasMessages(response) {
+    return response.Messages && response.Messages.length > 0;
+}
+function addMessageUuidToError(error, message) {
+    try {
+        const messageBody = JSON.parse(message.Body);
+        const messageUuid = messageBody && messageBody.payload && messageBody.payload.uuid;
+        error.messageUuid = messageUuid;
+    }
+    catch (err) { }
+}
+class Consumer extends events_1.EventEmitter {
+    constructor(options) {
+        super();
+        assertOptions(options);
+        this.queueUrl = options.queueUrl;
+        this.handleMessage = options.handleMessage;
+        this.handleMessageBatch = options.handleMessageBatch;
+        this.pollingStartedInstrumentCallback = options.pollingStartedInstrumentCallback;
+        this.pollingFinishedInstrumentCallback = options.pollingFinishedInstrumentCallback;
+        this.batchStartedInstrumentCallBack = options.batchStartedInstrumentCallBack;
+        this.batchFinishedInstrumentCallBack = options.batchFinishedInstrumentCallBack;
+        this.batchFailedInstrumentCallBack = options.batchFailedInstrumentCallBack;
+        this.handleMessageTimeout = options.handleMessageTimeout;
+        this.attributeNames = options.attributeNames || [];
+        this.messageAttributeNames = options.messageAttributeNames || [];
+        this.stopped = true;
+        this.batchSize = options.batchSize || 1;
+        this.concurrencyLimit = options.concurrencyLimit || 30;
+        this.freeConcurrentSlots = this.concurrencyLimit;
+        this.visibilityTimeout = options.visibilityTimeout;
+        this.terminateVisibilityTimeout = options.terminateVisibilityTimeout || false;
+        this.waitTimeSeconds = options.waitTimeSeconds || 20;
+        this.authenticationErrorTimeout = options.authenticationErrorTimeout || 10000;
+        this.pollingWaitTimeMs = options.pollingWaitTimeMs || 0;
+        this.msDelayOnEmptyBatchSize = options.msDelayOnEmptyBatchSize || 5;
+        this.sqs =
+            options.sqs ||
+                new SQS({
+                    region: options.region || process.env.AWS_REGION || 'eu-west-1',
+                });
+        bind_1.autoBind(this);
+    }
+    get isRunning() {
+        return !this.stopped;
+    }
+    static create(options) {
+        return new Consumer(options);
+    }
+    start() {
+        if (this.stopped) {
+            debug('Starting consumer');
+            this.stopped = false;
+            this.poll();
+        }
+    }
+    stop() {
+        debug('Stopping consumer');
+        this.stopped = true;
+    }
+    setBatchSize(newBatchSize) {
+        this.batchSize = newBatchSize;
+    }
+    setConcurrencyLimit(newConcurrencyLimit) {
+        const concurrencyLimitDiff = newConcurrencyLimit - this.concurrencyLimit;
+        const newFreeConcurrentSlots = Math.max(0, this.freeConcurrentSlots + concurrencyLimitDiff);
+        this.concurrencyLimit = newConcurrencyLimit;
+        this.freeConcurrentSlots = newFreeConcurrentSlots;
+        this.reportConcurrencyUsage(this.freeConcurrentSlots);
+    }
+    setPollingWaitTimeMs(newPollingWaitTimeMs) {
+        this.pollingWaitTimeMs = newPollingWaitTimeMs;
+    }
+    async reportMessageFromBatchFinished(message, error) {
+        debug('Message from batch has finished');
+        this.freeConcurrentSlots++;
+        this.reportConcurrencyUsage(this.freeConcurrentSlots);
+        try {
+            if (error)
+                throw error;
+            await this.deleteMessage(message);
+            this.emit('message_processed', message, this.queueUrl);
+        }
+        catch (err) {
+            this.emitError(err, message);
+        }
+    }
+    reportNumberOfMessagesReceived(numberOfMessages) {
+        debug('Reducing number of messages received from freeConcurrentSlots');
+        this.freeConcurrentSlots = this.freeConcurrentSlots - numberOfMessages;
+        this.reportConcurrencyUsage(this.freeConcurrentSlots);
+    }
+    async handleSqsResponse(response) {
+        debug('Received SQS response');
+        debug(response);
+        const hasResponseWithMessages = !!response && hasMessages(response);
+        const numberOfMessages = hasResponseWithMessages ? response.Messages.length : 0;
+        if (this.pollingFinishedInstrumentCallback) {
+            // instrument pod how many messages received
+            this.pollingFinishedInstrumentCallback({
+                instanceId: process.env.HOSTNAME,
+                queueUrl: this.queueUrl,
+                messagesReceived: numberOfMessages,
+                freeConcurrentSlots: this.freeConcurrentSlots,
+            });
+        }
+        if (response) {
+            if (hasMessages(response)) {
+                if (this.handleMessageBatch) {
+                    // prefer handling messages in batch when available
+                    await this.processMessageBatch(response.Messages);
+                }
+                else {
+                    await Promise.all(response.Messages.map(this.processMessage));
+                }
+                this.emit('response_processed', this.queueUrl);
+            }
+            else {
+                this.emit('empty', this.queueUrl);
+            }
+        }
+    }
+    async processMessage(message) {
+        this.emit('message_received', message, this.queueUrl);
+        try {
+            await this.executeHandler(message);
+            await this.deleteMessage(message);
+            this.emit('message_processed', message, this.queueUrl);
+        }
+        catch (err) {
+            this.emitError(err, message);
+            if (this.terminateVisibilityTimeout) {
+                try {
+                    await this.terminateVisabilityTimeout(message);
+                }
+                catch (err) {
+                    this.emit('error', err, message, this.queueUrl);
+                }
+            }
+        }
+    }
+    async receiveMessage(params) {
+        try {
+            return await this.sqs.receiveMessage(params).promise();
+        }
+        catch (err) {
+            throw toSQSError(err, `SQS receive message failed: ${err.message}`);
+        }
+    }
+    async deleteMessage(message) {
+        debug('Deleting message %s', message.MessageId);
+        const deleteParams = {
+            QueueUrl: this.queueUrl,
+            ReceiptHandle: message.ReceiptHandle,
+        };
+        try {
+            await this.sqs.deleteMessage(deleteParams).promise();
+        }
+        catch (err) {
+            throw toSQSError(err, `SQS delete message failed: ${err.message}`);
+        }
+    }
+    async executeHandler(message) {
+        let timeout;
+        let pending;
+        try {
+            if (this.handleMessageTimeout) {
+                [timeout, pending] = createTimeout(this.handleMessageTimeout);
+                await Promise.race([this.handleMessage(message), pending]);
+            }
+            else {
+                await this.handleMessage(message);
+            }
+        }
+        catch (err) {
+            addMessageUuidToError(err, message);
+            if (err instanceof errors_1.TimeoutError) {
+                err.message = `Message handler timed out after ${this.handleMessageTimeout}ms: Operation timed out.`;
+            }
+            else {
+                err.message = `Unexpected message handler failure: ${err.message}`;
+            }
+            throw err;
+        }
+        finally {
+            clearTimeout(timeout);
+        }
+    }
+    async terminateVisabilityTimeout(message) {
+        return this.sqs
+            .changeMessageVisibility({
+            QueueUrl: this.queueUrl,
+            ReceiptHandle: message.ReceiptHandle,
+            VisibilityTimeout: 0,
+        })
+            .promise();
+    }
+    emitError(err, message) {
+        if (err.name === errors_1.SQSError.name) {
+            this.emit('error', err, message, this.queueUrl);
+        }
+        else if (err instanceof errors_1.TimeoutError) {
+            this.emit('timeout_error', err, message, this.queueUrl);
+        }
+        else {
+            this.emit('processing_error', err, message, this.queueUrl);
+        }
+    }
+    poll() {
+        if (this.stopped) {
+            this.emit('stopped', this.queueUrl);
+            return;
+        }
+        const pollBatchSize = Math.min(this.batchSize, this.freeConcurrentSlots);
+        debug('Polling for messages');
+        if (this.pollingStartedInstrumentCallback) {
+            this.pollingStartedInstrumentCallback({
+                instanceId: process.env.HOSTNAME,
+                queueUrl: this.queueUrl,
+                pollBatchSize,
+                freeConcurrentSlots: this.freeConcurrentSlots,
+            });
+        }
+        let currentPollingTimeout = this.pollingWaitTimeMs;
+        if (pollBatchSize > 0) {
+            const receiveParams = {
+                QueueUrl: this.queueUrl,
+                AttributeNames: this.attributeNames,
+                MessageAttributeNames: this.messageAttributeNames,
+                MaxNumberOfMessages: pollBatchSize,
+                WaitTimeSeconds: this.waitTimeSeconds,
+                VisibilityTimeout: this.visibilityTimeout,
+            };
+            this.receiveMessage(receiveParams)
+                .then(this.handleSqsResponse)
+                .catch((err) => {
+                this.emit('unhandled_error', err, this.queueUrl);
+                if (isNonExistentQueueError(err)) {
+                    throw new Error(`Could not receive messages - non existent queue - ${this.queueUrl}`);
+                }
+                if (isConnectionError(err)) {
+                    debug('There was an authentication error. Pausing before retrying.');
+                    currentPollingTimeout = this.authenticationErrorTimeout;
+                }
+                return;
+            })
+                .then(() => {
+                setTimeout(this.poll, currentPollingTimeout);
+            })
+                .catch((err) => {
+                this.emit('unhandled_error', err, this.queueUrl);
+            });
+        }
+        else {
+            setTimeout(this.poll, this.msDelayOnEmptyBatchSize);
+        }
+    }
+    async processMessageBatch(messages) {
+        messages.forEach((message) => {
+            this.emit('message_received', message, this.queueUrl);
+        });
+        this.reportNumberOfMessagesReceived(messages.length);
+        const batchUuid = generateUuid();
+        if (this.batchStartedInstrumentCallBack) {
+            this.batchStartedInstrumentCallBack({
+                instanceId: process.env.HOSTNAME,
+                queueUrl: this.queueUrl,
+                batchUuid,
+                numberOfMessages: messages.length,
+                freeConcurrentSlots: this.freeConcurrentSlots,
+            });
+        }
+        this.handleMessageBatch(messages, this)
+            .then(() => {
+            if (this.batchFinishedInstrumentCallBack) {
+                this.batchFinishedInstrumentCallBack({
+                    instanceId: process.env.HOSTNAME,
+                    queueUrl: this.queueUrl,
+                    batchUuid,
+                    numberOfMessages: messages.length,
+                    freeConcurrentSlots: this.freeConcurrentSlots,
+                });
+            }
+        })
+            .catch((err) => {
+            if (this.batchFailedInstrumentCallBack) {
+                this.batchFailedInstrumentCallBack({
+                    instanceId: process.env.HOSTNAME,
+                    queueUrl: this.queueUrl,
+                    batchUuid,
+                    numberOfMessages: messages.length,
+                    freeConcurrentSlots: this.freeConcurrentSlots,
+                    error: err,
+                });
+            }
+        });
+    }
+    reportConcurrencyUsage(currentFreeConcurrencySlots) {
+        this.emit('concurrency_usage_updated', currentFreeConcurrencySlots, this.concurrencyLimit, this.queueUrl);
+    }
+}
+exports.Consumer = Consumer;
diff --git a/dist/errors.d.ts b/dist/errors.d.ts
new file mode 100644
index 00000000..f14df68c
--- /dev/null
+++ b/dist/errors.d.ts
@@ -0,0 +1,13 @@
+declare class SQSError extends Error {
+    code: string;
+    statusCode: number;
+    region: string;
+    hostname: string;
+    time: Date;
+    retryable: boolean;
+    constructor(message: string);
+}
+declare class TimeoutError extends Error {
+    constructor(message?: string);
+}
+export { SQSError, TimeoutError };
diff --git a/dist/errors.js b/dist/errors.js
new file mode 100644
index 00000000..1e30c249
--- /dev/null
+++ b/dist/errors.js
@@ -0,0 +1,17 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+class SQSError extends Error {
+    constructor(message) {
+        super(message);
+        this.name = this.constructor.name;
+    }
+}
+exports.SQSError = SQSError;
+class TimeoutError extends Error {
+    constructor(message = 'Operation timed out.') {
+        super(message);
+        this.message = message;
+        this.name = 'TimeoutError';
+    }
+}
+exports.TimeoutError = TimeoutError;
diff --git a/dist/index.d.ts b/dist/index.d.ts
new file mode 100644
index 00000000..84ff4197
--- /dev/null
+++ b/dist/index.d.ts
@@ -0,0 +1 @@
+export { Consumer, ConsumerOptions } from './consumer';
diff --git a/dist/index.js b/dist/index.js
new file mode 100644
index 00000000..20a65164
--- /dev/null
+++ b/dist/index.js
@@ -0,0 +1,4 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+var consumer_1 = require("./consumer");
+exports.Consumer = consumer_1.Consumer;
diff --git a/package-lock.json b/package-lock.json
index f9b201a5..de3db453 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,24 +1,52 @@
 {
   "name": "sqs-consumer",
-  "version": "5.4.0",
-  "lockfileVersion": 1,
+  "version": "6.2.0",
+  "lockfileVersion": 3,
   "requires": true,
-  "dependencies": {
-    "@babel/code-frame": {
+  "packages": {
+    "": {
+      "name": "sqs-consumer",
+      "version": "6.2.0",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "aws-sdk": "2.1490.0",
+        "debug": "^4.1.1"
+      },
+      "devDependencies": {
+        "@types/chai": "^4.1.4",
+        "@types/debug": "^4.1.3",
+        "@types/mocha": "^2.2.43",
+        "@types/node": "^10.12.18",
+        "@types/sinon": "^4.0.0",
+        "@types/typescript": "^2.0.0",
+        "chai": "^4.2.0",
+        "codeclimate-test-reporter": "^0.5.1",
+        "mocha": "^5.2.0",
+        "nyc": "^14.1.1",
+        "p-event": "^2.1.0",
+        "sinon": "^7.2.2",
+        "ts-node": "^3.3.0",
+        "tslint": "^5.17.0",
+        "tslint-config-airbnb": "^5.3.1",
+        "tslint-microsoft-contrib": "^5.0.3",
+        "typescript": "^2.6.1"
+      }
+    },
+    "node_modules/@babel/code-frame": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
       "integrity": "sha512-OfC2uemaknXr87bdLUkWog7nYuliM9Ij5HUcajsVcMCpQrcLmtxRbVFTIqmcSkSeYRBFBRxs2FiUqFJDLdiebA==",
       "dev": true,
-      "requires": {
+      "dependencies": {
         "@babel/highlight": "^7.0.0"
       }
     },
-    "@babel/generator": {
+    "node_modules/@babel/generator": {
       "version": "7.4.4",
       "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.4.4.tgz",
       "integrity": "sha512-53UOLK6TVNqKxf7RUh8NE851EHRxOOeVXKbK2bivdb+iziMyk03Sr4eaE9OELCbyZAAafAKPDwF2TPUES5QbxQ==",
       "dev": true,
-      "requires": {
+      "dependencies": {
         "@babel/types": "^7.4.4",
         "jsesc": "^2.5.1",
         "lodash": "^4.17.11",
@@ -26,69 +54,75 @@
         "trim-right": "^1.0.1"
       }
     },
-    "@babel/helper-function-name": {
+    "node_modules/@babel/helper-function-name": {
       "version": "7.1.0",
       "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.1.0.tgz",
       "integrity": "sha512-A95XEoCpb3TO+KZzJ4S/5uW5fNe26DjBGqf1o9ucyLyCmi1dXq/B3c8iaWTfBk3VvetUxl16e8tIrd5teOCfGw==",
       "dev": true,
-      "requires": {
+      "dependencies": {
         "@babel/helper-get-function-arity": "^7.0.0",
         "@babel/template": "^7.1.0",
         "@babel/types": "^7.0.0"
       }
     },
-    "@babel/helper-get-function-arity": {
+    "node_modules/@babel/helper-get-function-arity": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0.tgz",
       "integrity": "sha512-r2DbJeg4svYvt3HOS74U4eWKsUAMRH01Z1ds1zx8KNTPtpTL5JAsdFv8BNyOpVqdFhHkkRDIg5B4AsxmkjAlmQ==",
       "dev": true,
-      "requires": {
+      "dependencies": {
         "@babel/types": "^7.0.0"
       }
     },
-    "@babel/helper-split-export-declaration": {
+    "node_modules/@babel/helper-split-export-declaration": {
       "version": "7.4.4",
       "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.4.4.tgz",
       "integrity": "sha512-Ro/XkzLf3JFITkW6b+hNxzZ1n5OQ80NvIUdmHspih1XAhtN3vPTuUFT4eQnela+2MaZ5ulH+iyP513KJrxbN7Q==",
       "dev": true,
-      "requires": {
+      "dependencies": {
         "@babel/types": "^7.4.4"
       }
     },
-    "@babel/highlight": {
+    "node_modules/@babel/highlight": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0.tgz",
       "integrity": "sha512-UFMC4ZeFC48Tpvj7C8UgLvtkaUuovQX+5xNWrsIoMG8o2z+XFKjKaN9iVmS84dPwVN00W4wPmqvYoZF3EGAsfw==",
       "dev": true,
-      "requires": {
+      "dependencies": {
         "chalk": "^2.0.0",
         "esutils": "^2.0.2",
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         "spdx-expression-parse": "^3.0.0"
       }
     },
-    "verror": {
+    "node_modules/verror": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
       "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
       "dev": true,
-      "requires": {
+      "engines": [
+        "node >=0.6.0"
+      ],
+      "dependencies": {
         "assert-plus": "^1.0.0",
         "core-util-is": "1.0.2",
         "extsprintf": "^1.2.0"
       }
     },
-    "which": {
+    "node_modules/which": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
       "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
       "dev": true,
-      "requires": {
+      "dependencies": {
         "isexe": "^2.0.0"
+      },
+      "bin": {
+        "which": "bin/which"
       }
     },
-    "which-module": {
+    "node_modules/which-module": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
       "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
       "dev": true
     },
-    "wordwrap": {
+    "node_modules/which-typed-array": {
+      "version": "1.1.18",
+      "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.18.tgz",
+      "integrity": "sha512-qEcY+KJYlWyLH9vNbsr6/5j59AXk5ni5aakf8ldzBvGde6Iz4sxZGkJyWSAueTG7QhOvNRYb1lDdFmL5Td0QKA==",
+      "dependencies": {
+        "available-typed-arrays": "^1.0.7",
+        "call-bind": "^1.0.8",
+        "call-bound": "^1.0.3",
+        "for-each": "^0.3.3",
+        "gopd": "^1.2.0",
+        "has-tostringtag": "^1.0.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/wordwrap": {
       "version": "0.0.3",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
       "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc=",
-      "dev": true
+      "dev": true,
+      "engines": {
+        "node": ">=0.4.0"
+      }
     },
-    "wrap-ansi": {
+    "node_modules/wrap-ansi": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
       "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==",
       "dev": true,
-      "requires": {
+      "dependencies": {
         "ansi-styles": "^3.2.0",
         "string-width": "^3.0.0",
         "strip-ansi": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=6"
       }
     },
-    "wrappy": {
+    "node_modules/wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
-    "write-file-atomic": {
+    "node_modules/write-file-atomic": {
       "version": "2.4.3",
       "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.3.tgz",
       "integrity": "sha512-GaETH5wwsX+GcnzhPgKcKjJ6M2Cq3/iZp1WyY/X1CSqrW+jVNM9Y7D8EC2sM4ZG/V8wZlSniJnCKWPmBYAucRQ==",
       "dev": true,
-      "requires": {
+      "dependencies": {
         "graceful-fs": "^4.1.11",
         "imurmurhash": "^0.1.4",
         "signal-exit": "^3.0.2"
       }
     },
-    "xml2js": {
-      "version": "0.4.19",
-      "resolved": "https://registry.npmjs.org/xml2js/-/xml2js-0.4.19.tgz",
-      "integrity": "sha512-esZnJZJOiJR9wWKMyuvSE1y6Dq5LCuJanqhxslH2bxM6duahNZ+HMpCLhBQGZkbX6xRf8x1Y2eJlgt2q3qo49Q==",
-      "requires": {
+    "node_modules/xml2js": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/xml2js/-/xml2js-0.5.0.tgz",
+      "integrity": "sha512-drPFnkQJik/O+uPKpqSgr22mpuFHqKdbS835iAQrUC73L2F5WkboIRd63ai/2Yg6I1jzifPFKH2NTK+cfglkIA==",
+      "dependencies": {
         "sax": ">=0.6.0",
-        "xmlbuilder": "~9.0.1"
+        "xmlbuilder": "~11.0.0"
+      },
+      "engines": {
+        "node": ">=4.0.0"
       }
     },
-    "xmlbuilder": {
-      "version": "9.0.7",
-      "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-9.0.7.tgz",
-      "integrity": "sha1-Ey7mPS7FVlxVfiD0wi35rKaGsQ0="
+    "node_modules/xmlbuilder": {
+      "version": "11.0.1",
+      "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-11.0.1.tgz",
+      "integrity": "sha512-fDlsI/kFEx7gLvbecc0/ohLG50fugQp8ryHzMTuW9vSa1GJ0XYWKnhsUx7oie3G98+r56aTQIUB4kht42R3JvA==",
+      "engines": {
+        "node": ">=4.0"
+      }
     },
-    "y18n": {
+    "node_modules/y18n": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
       "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
       "dev": true
     },
-    "yallist": {
+    "node_modules/yallist": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
       "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
       "dev": true
     },
-    "yargs": {
+    "node_modules/yargs": {
       "version": "13.2.4",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.4.tgz",
       "integrity": "sha512-HG/DWAJa1PAnHT9JAhNa8AbAv3FPaiLzioSjCcmuXXhP8MlpHO5vwls4g4j6n30Z74GVQj8Xa62dWVx1QCGklg==",
       "dev": true,
-      "requires": {
+      "dependencies": {
         "cliui": "^5.0.0",
         "find-up": "^3.0.0",
         "get-caller-file": "^2.0.1",
@@ -2497,21 +3443,24 @@
         "yargs-parser": "^13.1.0"
       }
     },
-    "yargs-parser": {
+    "node_modules/yargs-parser": {
       "version": "13.1.0",
       "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.0.tgz",
       "integrity": "sha512-Yq+32PrijHRri0vVKQEm+ys8mbqWjLiwQkMFNXEENutzLPP0bE4Lcd4iA3OQY5HF+GD3xXxf0MEHb8E4/SA3AA==",
       "dev": true,
-      "requires": {
+      "dependencies": {
         "camelcase": "^5.0.0",
         "decamelize": "^1.2.0"
       }
     },
-    "yn": {
+    "node_modules/yn": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/yn/-/yn-2.0.0.tgz",
       "integrity": "sha1-5a2ryKz0CPY4X8dklWhMiOavaJo=",
-      "dev": true
+      "dev": true,
+      "engines": {
+        "node": ">=4"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 80a19372..aa8fe7af 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sqs-consumer",
-  "version": "5.4.0",
+  "version": "6.3.0",
   "description": "Build SQS-based Node applications without the boilerplate",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
@@ -50,7 +50,7 @@
     "typescript": "^2.6.1"
   },
   "dependencies": {
-    "aws-sdk": "^2.443.0",
+    "aws-sdk": "2.1489.0",
     "debug": "^4.1.1"
   },
   "nyc": {
diff --git a/src/consumer.ts b/src/consumer.ts
index 681e1d74..9259f144 100644
--- a/src/consumer.ts
+++ b/src/consumer.ts
@@ -2,6 +2,7 @@ import { AWSError } from 'aws-sdk';
 import * as SQS from 'aws-sdk/clients/sqs';
 import { PromiseResult } from 'aws-sdk/lib/request';
 import * as Debug from 'debug';
+import * as crypto from 'crypto';
 import { EventEmitter } from 'events';
 import { autoBind } from './bind';
 import { SQSError, TimeoutError } from './errors';
@@ -15,7 +16,7 @@ type ReceiveMessageRequest = SQS.Types.ReceiveMessageRequest;
 const requiredOptions = [
   'queueUrl',
   // only one of handleMessage / handleMessagesBatch is required
-  'handleMessage|handleMessageBatch'
+  'handleMessage|handleMessageBatch',
 ];
 
 interface TimeoutResponse {
@@ -23,6 +24,10 @@ interface TimeoutResponse {
   pending: Promise<void>;
 }
 
+function generateUuid(): string {
+  return crypto.randomBytes(16).toString('hex');
+}
+
 function createTimeout(duration: number): TimeoutResponse[] {
   let timeout;
   const pending = new Promise((_, reject) => {
@@ -48,11 +53,19 @@ function assertOptions(options: ConsumerOptions): void {
 
 function isConnectionError(err: Error): Boolean {
   if (err instanceof SQSError) {
-    return (err.statusCode === 403 || err.code === 'CredentialsError' || err.code === 'UnknownEndpoint');
+    return err.statusCode === 403 || err.code === 'CredentialsError' || err.code === 'UnknownEndpoint';
   }
   return false;
 }
 
+function isNonExistentQueueError(err: Error): Boolean {
+  if (err instanceof SQSError) {
+    return err.code === 'AWS.SimpleQueueService.NonExistentQueue';
+  }
+
+  return false;
+}
+
 function toSQSError(err: AWSError, message: string): SQSError {
   const sqsError = new SQSError(message);
   sqsError.code = err.code;
@@ -69,37 +82,61 @@ function hasMessages(response: ReceieveMessageResponse): boolean {
   return response.Messages && response.Messages.length > 0;
 }
 
+function addMessageUuidToError(error, message): void {
+  try {
+    const messageBody = JSON.parse(message.Body);
+    const messageUuid = messageBody && messageBody.payload && messageBody.payload.uuid;
+
+    error.messageUuid = messageUuid;
+  } catch (err) {}
+}
+
 export interface ConsumerOptions {
   queueUrl?: string;
   attributeNames?: string[];
   messageAttributeNames?: string[];
   stopped?: boolean;
+  concurrencyLimit?: number;
   batchSize?: number;
   visibilityTimeout?: number;
   waitTimeSeconds?: number;
   authenticationErrorTimeout?: number;
   pollingWaitTimeMs?: number;
+  msDelayOnEmptyBatchSize?: number;
   terminateVisibilityTimeout?: boolean;
   sqs?: SQS;
   region?: string;
   handleMessageTimeout?: number;
   handleMessage?(message: SQSMessage): Promise<void>;
-  handleMessageBatch?(messages: SQSMessage[]): Promise<void>;
+  handleMessageBatch?(messages: SQSMessage[], consumer: Consumer): Promise<void>;
+  pollingStartedInstrumentCallback?(eventData: object): void;
+  pollingFinishedInstrumentCallback?(eventData: object): void;
+  batchStartedInstrumentCallBack?(eventData: object): void;
+  batchFinishedInstrumentCallBack?(eventData: object): void;
+  batchFailedInstrumentCallBack?(eventData: object): void;
 }
 
 export class Consumer extends EventEmitter {
   private queueUrl: string;
   private handleMessage: (message: SQSMessage) => Promise<void>;
-  private handleMessageBatch: (message: SQSMessage[]) => Promise<void>;
+  private handleMessageBatch: (message: SQSMessage[], consumer: Consumer) => Promise<void>;
+  private pollingStartedInstrumentCallback?: (eventData: object) => void;
+  private pollingFinishedInstrumentCallback?: (eventData: object) => void;
+  private batchStartedInstrumentCallBack?: (eventData: object) => void;
+  private batchFinishedInstrumentCallBack?: (eventData: object) => void;
+  private batchFailedInstrumentCallBack?: (eventData: object) => void;
   private handleMessageTimeout: number;
   private attributeNames: string[];
   private messageAttributeNames: string[];
   private stopped: boolean;
+  private concurrencyLimit: number;
+  private freeConcurrentSlots: number;
   private batchSize: number;
   private visibilityTimeout: number;
   private waitTimeSeconds: number;
   private authenticationErrorTimeout: number;
   private pollingWaitTimeMs: number;
+  private msDelayOnEmptyBatchSize: number;
   private terminateVisibilityTimeout: boolean;
   private sqs: SQS;
 
@@ -109,20 +146,30 @@ export class Consumer extends EventEmitter {
     this.queueUrl = options.queueUrl;
     this.handleMessage = options.handleMessage;
     this.handleMessageBatch = options.handleMessageBatch;
+    this.pollingStartedInstrumentCallback = options.pollingStartedInstrumentCallback;
+    this.pollingFinishedInstrumentCallback = options.pollingFinishedInstrumentCallback;
+    this.batchStartedInstrumentCallBack = options.batchStartedInstrumentCallBack;
+    this.batchFinishedInstrumentCallBack = options.batchFinishedInstrumentCallBack;
+    this.batchFailedInstrumentCallBack = options.batchFailedInstrumentCallBack;
     this.handleMessageTimeout = options.handleMessageTimeout;
     this.attributeNames = options.attributeNames || [];
     this.messageAttributeNames = options.messageAttributeNames || [];
     this.stopped = true;
     this.batchSize = options.batchSize || 1;
+    this.concurrencyLimit = options.concurrencyLimit || 30;
+    this.freeConcurrentSlots = this.concurrencyLimit;
     this.visibilityTimeout = options.visibilityTimeout;
     this.terminateVisibilityTimeout = options.terminateVisibilityTimeout || false;
     this.waitTimeSeconds = options.waitTimeSeconds || 20;
     this.authenticationErrorTimeout = options.authenticationErrorTimeout || 10000;
     this.pollingWaitTimeMs = options.pollingWaitTimeMs || 0;
+    this.msDelayOnEmptyBatchSize = options.msDelayOnEmptyBatchSize || 5;
 
-    this.sqs = options.sqs || new SQS({
-      region: options.region || process.env.AWS_REGION || 'eu-west-1'
-    });
+    this.sqs =
+      options.sqs ||
+      new SQS({
+        region: options.region || process.env.AWS_REGION || 'eu-west-1',
+      });
 
     autoBind(this);
   }
@@ -148,10 +195,62 @@ export class Consumer extends EventEmitter {
     this.stopped = true;
   }
 
+  public setBatchSize(newBatchSize: number): void {
+    this.batchSize = newBatchSize;
+  }
+
+  public setConcurrencyLimit(newConcurrencyLimit: number): void {
+    const concurrencyLimitDiff = newConcurrencyLimit - this.concurrencyLimit;
+    const newFreeConcurrentSlots = Math.max(0, this.freeConcurrentSlots + concurrencyLimitDiff);
+
+    this.concurrencyLimit = newConcurrencyLimit;
+    this.freeConcurrentSlots = newFreeConcurrentSlots;
+    this.reportConcurrencyUsage(this.freeConcurrentSlots);
+  }
+
+  public setPollingWaitTimeMs(newPollingWaitTimeMs: number): void {
+    this.pollingWaitTimeMs = newPollingWaitTimeMs;
+  }
+
+  public async reportMessageFromBatchFinished(message: SQSMessage, error?: Error): Promise<void> {
+    debug('Message from batch has finished');
+
+    this.freeConcurrentSlots++;
+    this.reportConcurrencyUsage(this.freeConcurrentSlots);
+
+    try {
+      if (error) throw error;
+
+      await this.deleteMessage(message);
+      this.emit('message_processed', message, this.queueUrl);
+    } catch (err) {
+      this.emitError(err, message);
+    }
+  }
+
+  private reportNumberOfMessagesReceived(numberOfMessages: number): void {
+    debug('Reducing number of messages received from freeConcurrentSlots');
+    this.freeConcurrentSlots = this.freeConcurrentSlots - numberOfMessages;
+    this.reportConcurrencyUsage(this.freeConcurrentSlots);
+  }
+
   private async handleSqsResponse(response: ReceieveMessageResponse): Promise<void> {
     debug('Received SQS response');
     debug(response);
 
+    const hasResponseWithMessages = !!response && hasMessages(response);
+    const numberOfMessages = hasResponseWithMessages ? response.Messages.length : 0;
+
+    if (this.pollingFinishedInstrumentCallback) {
+      // instrument pod how many messages received
+      this.pollingFinishedInstrumentCallback({
+        instanceId: process.env.HOSTNAME,
+        queueUrl: this.queueUrl,
+        messagesReceived: numberOfMessages,
+        freeConcurrentSlots: this.freeConcurrentSlots,
+      });
+    }
+
     if (response) {
       if (hasMessages(response)) {
         if (this.handleMessageBatch) {
@@ -160,20 +259,20 @@ export class Consumer extends EventEmitter {
         } else {
           await Promise.all(response.Messages.map(this.processMessage));
         }
-        this.emit('response_processed');
+        this.emit('response_processed', this.queueUrl);
       } else {
-        this.emit('empty');
+        this.emit('empty', this.queueUrl);
       }
     }
   }
 
   private async processMessage(message: SQSMessage): Promise<void> {
-    this.emit('message_received', message);
+    this.emit('message_received', message, this.queueUrl);
 
     try {
       await this.executeHandler(message);
       await this.deleteMessage(message);
-      this.emit('message_processed', message);
+      this.emit('message_processed', message, this.queueUrl);
     } catch (err) {
       this.emitError(err, message);
 
@@ -181,7 +280,7 @@ export class Consumer extends EventEmitter {
         try {
           await this.terminateVisabilityTimeout(message);
         } catch (err) {
-          this.emit('error', err, message);
+          this.emit('error', err, message, this.queueUrl);
         }
       }
     }
@@ -189,9 +288,7 @@ export class Consumer extends EventEmitter {
 
   private async receiveMessage(params: ReceiveMessageRequest): Promise<ReceieveMessageResponse> {
     try {
-      return await this.sqs
-        .receiveMessage(params)
-        .promise();
+      return await this.sqs.receiveMessage(params).promise();
     } catch (err) {
       throw toSQSError(err, `SQS receive message failed: ${err.message}`);
     }
@@ -202,13 +299,11 @@ export class Consumer extends EventEmitter {
 
     const deleteParams = {
       QueueUrl: this.queueUrl,
-      ReceiptHandle: message.ReceiptHandle
+      ReceiptHandle: message.ReceiptHandle,
     };
 
     try {
-      await this.sqs
-        .deleteMessage(deleteParams)
-        .promise();
+      await this.sqs.deleteMessage(deleteParams).promise();
     } catch (err) {
       throw toSQSError(err, `SQS delete message failed: ${err.message}`);
     }
@@ -220,14 +315,12 @@ export class Consumer extends EventEmitter {
     try {
       if (this.handleMessageTimeout) {
         [timeout, pending] = createTimeout(this.handleMessageTimeout);
-        await Promise.race([
-          this.handleMessage(message),
-          pending
-        ]);
+        await Promise.race([this.handleMessage(message), pending]);
       } else {
         await this.handleMessage(message);
       }
     } catch (err) {
+      addMessageUuidToError(err, message);
       if (err instanceof TimeoutError) {
         err.message = `Message handler timed out after ${this.handleMessageTimeout}ms: Operation timed out.`;
       } else {
@@ -244,119 +337,121 @@ export class Consumer extends EventEmitter {
       .changeMessageVisibility({
         QueueUrl: this.queueUrl,
         ReceiptHandle: message.ReceiptHandle,
-        VisibilityTimeout: 0
+        VisibilityTimeout: 0,
       })
       .promise();
   }
 
   private emitError(err: Error, message: SQSMessage): void {
     if (err.name === SQSError.name) {
-      this.emit('error', err, message);
+      this.emit('error', err, message, this.queueUrl);
     } else if (err instanceof TimeoutError) {
-      this.emit('timeout_error', err, message);
+      this.emit('timeout_error', err, message, this.queueUrl);
     } else {
-      this.emit('processing_error', err, message);
+      this.emit('processing_error', err, message, this.queueUrl);
     }
   }
 
   private poll(): void {
     if (this.stopped) {
-      this.emit('stopped');
+      this.emit('stopped', this.queueUrl);
       return;
     }
 
+    const pollBatchSize = Math.min(this.batchSize, this.freeConcurrentSlots);
+
     debug('Polling for messages');
-    const receiveParams = {
-      QueueUrl: this.queueUrl,
-      AttributeNames: this.attributeNames,
-      MessageAttributeNames: this.messageAttributeNames,
-      MaxNumberOfMessages: this.batchSize,
-      WaitTimeSeconds: this.waitTimeSeconds,
-      VisibilityTimeout: this.visibilityTimeout
-    };
+    if (this.pollingStartedInstrumentCallback) {
+      this.pollingStartedInstrumentCallback({
+        instanceId: process.env.HOSTNAME,
+        queueUrl: this.queueUrl,
+        pollBatchSize,
+        freeConcurrentSlots: this.freeConcurrentSlots,
+      });
+    }
 
     let currentPollingTimeout = this.pollingWaitTimeMs;
-    this.receiveMessage(receiveParams)
-      .then(this.handleSqsResponse)
-      .catch((err) => {
-        this.emit('error', err);
-        if (isConnectionError(err)) {
-          debug('There was an authentication error. Pausing before retrying.');
-          currentPollingTimeout = this.authenticationErrorTimeout;
-        }
-        return;
-      }).then(() => {
-      setTimeout(this.poll, currentPollingTimeout);
-      }).catch((err) => {
-        this.emit('error', err);
-      });
+
+    if (pollBatchSize > 0) {
+      const receiveParams = {
+        QueueUrl: this.queueUrl,
+        AttributeNames: this.attributeNames,
+        MessageAttributeNames: this.messageAttributeNames,
+        MaxNumberOfMessages: pollBatchSize,
+        WaitTimeSeconds: this.waitTimeSeconds,
+        VisibilityTimeout: this.visibilityTimeout,
+      };
+
+      this.receiveMessage(receiveParams)
+        .then(this.handleSqsResponse)
+        .catch((err) => {
+          this.emit('unhandled_error', err, this.queueUrl);
+          if (isNonExistentQueueError(err)) {
+            throw new Error(`Could not receive messages - non existent queue - ${this.queueUrl}`);
+          }
+          if (isConnectionError(err)) {
+            debug('There was an authentication error. Pausing before retrying.');
+            currentPollingTimeout = this.authenticationErrorTimeout;
+          }
+
+          return;
+        })
+        .then(() => {
+          setTimeout(this.poll, currentPollingTimeout);
+        })
+        .catch((err) => {
+          this.emit('unhandled_error', err, this.queueUrl);
+        });
+    } else {
+      setTimeout(this.poll, this.msDelayOnEmptyBatchSize);
+    }
   }
 
   private async processMessageBatch(messages: SQSMessage[]): Promise<void> {
     messages.forEach((message) => {
-      this.emit('message_received', message);
+      this.emit('message_received', message, this.queueUrl);
     });
 
-    try {
-      await this.executeBatchHandler(messages);
-      await this.deleteMessageBatch(messages);
-      messages.forEach((message) => {
-        this.emit('message_processed', message);
-      });
-    } catch (err) {
-      this.emit('error', err, messages);
-
-      if (this.terminateVisibilityTimeout) {
-        try {
-          await this.terminateVisabilityTimeoutBatch(messages);
-        } catch (err) {
-          this.emit('error', err, messages);
-        }
-      }
-    }
-  }
-
-  private async deleteMessageBatch(messages: SQSMessage[]): Promise<void> {
-    debug('Deleting messages %s', messages.map((msg) => msg.MessageId).join(' ,'));
-
-    const deleteParams = {
-      QueueUrl: this.queueUrl,
-      Entries: messages.map(message => ({
-        Id: message.MessageId,
-        ReceiptHandle: message.ReceiptHandle
-      }))
-    };
+    this.reportNumberOfMessagesReceived(messages.length);
+    const batchUuid = generateUuid();
 
-    try {
-      await this.sqs
-        .deleteMessageBatch(deleteParams)
-        .promise();
-    } catch (err) {
-      throw toSQSError(err, `SQS delete message failed: ${err.message}`);
+    if (this.batchStartedInstrumentCallBack) {
+      this.batchStartedInstrumentCallBack({
+        instanceId: process.env.HOSTNAME,
+        queueUrl: this.queueUrl,
+        batchUuid,
+        numberOfMessages: messages.length,
+        freeConcurrentSlots: this.freeConcurrentSlots,
+      });
     }
-  }
 
-  private async executeBatchHandler(messages: SQSMessage[]): Promise<void> {
-    try {
-      await this.handleMessageBatch(messages);
-    } catch (err) {
-      err.message = `Unexpected message handler failure: ${err.message}`;
-      throw err;
-    }
+    this.handleMessageBatch(messages, this)
+      .then(() => {
+        if (this.batchFinishedInstrumentCallBack) {
+          this.batchFinishedInstrumentCallBack({
+            instanceId: process.env.HOSTNAME,
+            queueUrl: this.queueUrl,
+            batchUuid,
+            numberOfMessages: messages.length,
+            freeConcurrentSlots: this.freeConcurrentSlots,
+          });
+        }
+      })
+      .catch((err) => {
+        if (this.batchFailedInstrumentCallBack) {
+          this.batchFailedInstrumentCallBack({
+            instanceId: process.env.HOSTNAME,
+            queueUrl: this.queueUrl,
+            batchUuid,
+            numberOfMessages: messages.length,
+            freeConcurrentSlots: this.freeConcurrentSlots,
+            error: err,
+          });
+        }
+      });
   }
 
-  private async terminateVisabilityTimeoutBatch(messages: SQSMessage[]): Promise<PromiseResult<any, AWSError>> {
-    const params = {
-      QueueUrl: this.queueUrl,
-      Entries: messages.map((message) => ({
-        Id: message.MessageId,
-        ReceiptHandle: message.ReceiptHandle,
-        VisibilityTimeout: 0
-      }))
-    };
-    return this.sqs
-      .changeMessageVisibilityBatch(params)
-      .promise();
+  private reportConcurrencyUsage(currentFreeConcurrencySlots): void {
+    this.emit('concurrency_usage_updated', currentFreeConcurrencySlots, this.concurrencyLimit, this.queueUrl);
   }
-
 }