My nodejs url is very slow when I check it with apachebench mark. I'm getting only 500 req/sec. where as I have few other functions on the same file. And with that am getting 7000-12000 req/sec
function bid_now(req, res) {
req.qs = req.url.split('?')[1];
if (!req.qs) return;
req.qs = qs.parse(req.qs);
if (!parseInt(req.qs.auction_id) || !parseInt(req.qs.uid)) return res.end('0');
if (!objcache['auctions']) objcache['auctions'] = {};
var auction = objcache['auctions'][req.qs.auction_id];
if (!auction) return res.end('NO AUCTION ' + req.qs.auction_id);
auction.last_bidder = [req.qs.uid, '"pcontent"', auction.id, auction.cp_pcontent_points, Math.floor(new Date().valueOf() / 1000)];
if (!auction.inc_by) auction.inc_by = 0;
auction.inc_by++;
if (!objcache['users']) objcache['users'] = {};
if (!objcache['users'][req.qs.uid]) {
objcache['users'][req.qs.uid] = {
negate_points: 0
}
}
objcache['users'][req.qs.uid].negate_points += parseFloat(auction.cp_pcontent_points || 0);
if (!objcache['current_bidders']) {
objcache['current_bidders'] = {};
}
objcache['current_bidders'][parseInt(req.qs.auction_id, 10)] = parseInt(req.qs.uid, 10);
res.end(auction.cp_pcontent_points.toString());
try {
sync_object_cache();
} catch (e) {
//
}
}
Related
public bool CheckIfValidSignedPdfExists(string fileServerPath, int memberagreementId)
{
var filePaths = Directory.GetFiles(fileServerPath);
if (filePaths.Length < 2)
{
return false;
}
var fileInfo = new List<FileInfo>();
foreach (var path in filePaths)
{
if (File.Exists(path))
fileInfo.Add(new FileInfo(path));
}
if (fileInfo.Count < 2)
return false;
else
{
fileInfo = fileInfo.OrderByDescending(x => x.LastWriteTimeUtc).Take(2).ToList();
//Rules: 1. Name 2.size 3. Last write time 4. Extension
var firstPdf = fileInfo.FirstOrDefault();
var lastPdf = fileInfo.LastOrDefault();
var firstFileNameCheck = string.Concat(Convert.ToString(memberagreementId), ".pdf");
var lastFileNameCheck = lastPdf.Name.StartsWith(Convert.ToString(memberagreementId) + "-")
&& lastPdf.Name.EndsWith(".pdf", StringComparison.OrdinalIgnoreCase);
if ((firstPdf.Name.Equals(firstFileNameCheck, StringComparison.OrdinalIgnoreCase)) &&
(lastFileNameCheck) && (firstPdf.Length > lastPdf.Length) && (firstPdf.LastWriteTimeUtc >= lastPdf.LastWriteTimeUtc))
return true;
else
return false;
}
}
When this piece of code is running, we can see the cpu spike and the thread always relate to the above code.
HIGH CPU Thread Code
CPU Spike
We are not sure what wrong we are doing in this code which is causing this issue.
Intro
We're developing this javascript based web application that is supposed to print receipts using the epson javascript sdk.
Right now we've got this poc where multiple printers can be added to the app and where receipts can be printed per individual printer.
The problem is that the receipt will ONLY be printer from the last added printer.
Further investigating tells us that the sdk just uses the last added (connected) printer. This can be seen at the following images.
In the first image there are 2 printers setup. Notice the different ip addresses.
In the second image we log what EpsonPrinter instance is being used while printing. Notice the ip address is clearly the first printer.
In the third image we trace the network. Notice the ip address that is actually used (ignore the error).
We created our own EpsonPrinter class that can be found here or here below.
EpsonPrinter
export default class EpsonPrinter {
name = null
ipAddress = null
port = null
deviceId = null
crypto = false
buffer = false
eposdev = null
printer = null
intervalID = null
restry = 0
constructor (props) {
const {
name = 'Epson printer',
ipAddress,
port = 8008,
deviceId = 'local_printer',
crypto = false,
buffer = false
} = props
this.name = name
this.ipAddress = ipAddress
this.port = port
this.deviceId = deviceId
this.crypto = crypto
this.buffer = buffer
this.eposdev = new window.epson.ePOSDevice()
this.eposdev.onreconnecting = this.onReconnecting
this.eposdev.onreconnect = this.onReconnect
this.eposdev.ondisconnect = this.onDisconnect
this.connect()
}
onReconnecting = () => {
this.consoleLog('reconnecting')
}
onReconnect = () => {
this.consoleLog('reconnect')
}
onDisconnect = () => {
this.consoleLog('disconnect')
if (this.intervalID === null ){
this.intervalID = setInterval(() => this.reconnect(), 5000)
}
}
connect = () => {
this.consoleLog('connect')
this.eposdev.ondisconnect = null
this.eposdev.disconnect()
this.eposdev.connect(this.ipAddress, this.port, this.connectCallback)
}
reconnect = () => {
this.consoleLog('(Re)connect')
this.eposdev.connect(this.ipAddress, this.port, this.connectCallback)
}
connectCallback = (data) => {
clearInterval(this.intervalID)
this.intervalID = null
this.eposdev.ondisconnect = this.onDisconnect
if (data === 'OK' || data === 'SSL_CONNECT_OK') {
this.createDevice()
} else {
setTimeout(() => this.reconnect(), 5000)
}
}
createDevice = () => {
console.log('create device, try: ' + this.restry)
const options = {
crypto: this.crypto,
buffer: this.buffer
}
this.eposdev.createDevice(this.deviceId, this.eposdev.DEVICE_TYPE_PRINTER, options, this.createDeviceCallback)
}
createDeviceCallback = (deviceObj, code) => {
this.restry++
if (code === 'OK') {
this.printer = deviceObj
this.printer.onreceive = this.onReceive
} else if (code === 'DEVICE_IN_USE') {
if (this.restry < 5) {
setTimeout(() => this.createDevice(), 3000)
}
}
}
onReceive = (response) => {
this.consoleLog('on receive: ', response)
let message = `Print ${this.name} ${response.success ? 'success' : 'failute'}\n`
message += `Code: ${response.code}\n`
message += `Status: \n`
if (response.status === this.printer.ASB_NO_RESPONSE) { message += ' No printer response\n' }
if (response.status === this.printer.ASB_PRINT_SUCCESS) { message += ' Print complete\n' }
if (response.status === this.printer.ASB_DRAWER_KICK) { message += ' Status of the drawer kick number 3 connector pin = "H"\n' }
if (response.status === this.printer.ASB_OFF_LINE) { message += ' Offline status\n' }
if (response.status === this.printer.ASB_COVER_OPEN) { message += ' Cover is open\n' }
if (response.status === this.printer.ASB_PAPER_FEED) { message += ' Paper feed switch is feeding paper\n' }
if (response.status === this.printer.ASB_WAIT_ON_LINE) { message += ' Waiting for online recovery\n' }
if (response.status === this.printer.ASB_PANEL_SWITCH) { message += ' Panel switch is ON\n' }
if (response.status === this.printer.ASB_MECHANICAL_ERR) { message += ' Mechanical error generated\n' }
if (response.status === this.printer.ASB_AUTOCUTTER_ERR) { message += ' Auto cutter error generated\n' }
if (response.status === this.printer.ASB_UNRECOVER_ERR) { message += ' Unrecoverable error generated\n' }
if (response.status === this.printer.ASB_AUTORECOVER_ERR) { message += ' Auto recovery error generated\n' }
if (response.status === this.printer.ASB_RECEIPT_NEAR_END) { message += ' No paper in the roll paper near end detector\n' }
if (response.status === this.printer.ASB_RECEIPT_END) { message += ' No paper in the roll paper end detector\n' }
if (response.status === this.printer.ASB_SPOOLER_IS_STOPPED) { message += ' Stop the spooler\n' }
if (!response.success) {
alert(message)
// TODO: error message?
} else {
// TODO: success -> remove from queue
}
}
printReceipt = () => {
this.consoleLog(`Print receipt, `, this)
try {
if (!this.printer) {
throw `No printer created for ${this.name}`
}
this.printer.addPulse(this.printer.DRAWER_1, this.printer.PULSE_100)
this.printer.addText(`Printed from: ${this.name}\n`)
this.printer.send()
} catch (err) {
let message = `Print ${this.name} failure\n`
message += `Error: ${err}`
alert(message)
}
}
consoleLog = (...rest) => {
console.log(`${this.name}: `, ...rest)
}
}
Poc
The full working poc can be found here.
Epson javascript sdk
2.9.0
Does anyone have any experience with the epson sdk? It it supposed to be able to support multiple connections on the same time? Please let use know.
For the ones looking for a way to handle multiple printers using this SDK. We came up with the following work around:
We created a separated 'printer app' that is responsible for handling ONE printer connection and hosted it online. We then 'load' this printer app into our app that needs multiple connections using Iframes. Communication between app and printer app is done by means of window.PostMessage API to, for example, initialise the printer with the correct printer connection and providing data that has to be printed.
It takes some effort but was the most stable solution we could come up with handling multiple connections.
If anyone else comes up with a better approach please let me know!
You can checkout our printer app here for inspiration (inspect the app because it doesn't show much visiting it just like that).
For use your class EpsonPrinter, i add also myPrinters class after your class:
class myPrinters {
printers = null;
cantidad = 0;
constructor() {
console.log("Creo la coleccion de printers");
this.printers = [];
}
inicializarConeccionImpresora(idImpresora, ip, puerto, _deviceId) {
let ipAddress = ip;
let port = puerto;
let deviceId = _deviceId;
console.log("Agrego una impresora");
let myPrinter = new EpsonPrinter(ipAddress);
myPrinter.port = port;
myPrinter.deviceId = deviceId;
myPrinter.id = idImpresora;
console.log('Id impresora antes de connect es: ' + idImpresora);
myPrinter.connect();
this.printers[this.cantidad] = myPrinter;
this.cantidad ++;
}
imprimirPruebaJS(idImpresora) {
let printer = null;
let printerTemp = null
for(var i = 0; i < this.printers.length; i++) {
printerTemp = this.printers[i];
if (printerTemp.id == idImpresora) {
printer = printerTemp.printer;
}
}
if (printer == null) {
console.log("La impresora no esta iniciada en clase myPrinters");
return;
}
printer.addText('Hola mundo texto normal\n');
printer.addFeed();
printer.addCut(printer.CUT_FEED);
}
}
call myPrinters class in this way :
myEpsonPrinters = new myPrinters();
myEpsonPrinters.inicializarConeccionImpresora(1, '192.168.0.51', 8008, 'local_printer');
myEpsonPrinters.inicializarConeccionImpresora(2, '192.168.0.52', 8008, 'local_printer');
myEpsonPrinters.imprimirPruebaJS(1)
or
myEpsonPrinters.imprimirPruebaJS(2)
Test it and tell me.
Juan
Just create multiple objects for printing simple as this
this.eposdev = [];
let printersCnt = 3;
let self = this;
for(let i=1 ; i <= printersCnt ; i++){
this.eposdev[i] = new window.epson.ePOSDevice()
this.eposdev[i].onreconnecting = function (){
this.consoleLog('reConnecting')
}
this.eposdev[i].onreconnect = function (){
this.consoleLog('onReconnect')
}
this.eposdev[i].ondisconnect = function (){
this.consoleLog('onDisconnect')
}
}
function connect(printerKey) => {
this.consoleLog('connect')
this.eposdev.ondisconnect = null
this.eposdev.disconnect()
this.eposdev.connect(self.ipAddress[printerKey], self.port[printerKey], function(){
clearInterval(self.intervalID)
self.intervalID = null
self.eposdev[i].ondisconnect = self.ondisconnect
if (data === 'OK' || data === 'SSL_CONNECT_OK') {
console.log('create device, try: ' + self.restry)
const options = {
crypto: self.crypto,
buffer: self.buffer
}
self.eposdev[printerKey].createDevice(self.deviceId, self.eposdev[printerKey].DEVICE_TYPE_PRINTER, options, function(deviceObj, code){
this.restry++
if (code === 'OK') {
self.printer[printerKey] = deviceObj
self.printer.onreceive = function(){
console.log("onreceive");
}
} else if (code === 'DEVICE_IN_USE') {
if (self.restry < 5) {
setTimeout(() => self.createDevice(printerKey), 3000)
}
})
}
} else {
setTimeout(() => self.reconnect(printerKey), 5000)
}
})
}
Epson says that with version 2.12.0 you can add more than one printer.
I'm trying to use android.media.AudioRecord to save audio, initialization is OK, startRecording() is also called without error, but when I start reading audio from the buffer I got error Failed resolving method read on class android.media.AudioRecord.
Here is the code:
const SAMPLE_RATE = 44100;
const RECORD_AUDIO = android.Manifest.permission.RECORD_AUDIO;
const AudioRecord = android.media.AudioRecord;
const AudioFormat = android.media.AudioFormat;
const MediaRecorder = android.media.MediaRecorder;
ngOnInit(): void {
this.bufferSize = AudioRecord.getMinBufferSize(SAMPLE_RATE, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT);
if (this.bufferSize == AudioRecord.ERROR || this.bufferSize == AudioRecord.ERROR_BAD_VALUE) {
this.bufferSize = SAMPLE_RATE * 2;
}
this.bufferSize = this.bufferSize * 10;
this.audioBuffer = new Array(this.bufferSize / 2);
if (!permissions.hasPermission(RECORD_AUDIO)) {
permissions.requestPermission(RECORD_AUDIO).then(() => {
this.createRecorder();
}, (err) => {
console.log('[BrowseComponent] ngOnInit, ', 'permissions error:', err);
});
}
else {
this.createRecorder();
}
}
createRecorder() {
this.record = new AudioRecord.Builder()
.setAudioSource(MediaRecorder.AudioSource.VOICE_COMMUNICATION)
.setAudioFormat(new AudioFormat.Builder()
.setEncoding(AudioFormat.ENCODING_PCM_16BIT)
.setSampleRate(SAMPLE_RATE)
.setChannelMask(AudioFormat.CHANNEL_IN_MONO)
.build())
.setBufferSizeInBytes(this.bufferSize)
.build();
this.recordState = this.record && this.record.getState();
if (this.recordState != AudioRecord.STATE_INITIALIZED) {
console.error('[BrowseComponent] createRecorder, ', 'AudioRecord can\'t initialize, state:', this.recordState);
return;
}
console.log('[BrowseComponent] createRecorder, ', 'AudioRecord:', this.record);
}
startRecord() {
this.recording = true;
this.record.startRecording();
this.shortsRead = 0;
while (this.recording) {
const numberOfShort = this.record.read(this.audioBuffer, 0, this.bufferSize);
this.shortsRead += numberOfShort;
// Do something with the audioBuffer
}
}
startRecord() is called from (tap) button handler.
Any ideas what may be wrong?
I guess the problem is that you are passing JavaScript Array instead of the Java Primitive (short) typed Array, so the runtime is unable to identify a method that matches the given parameters.
Use Array.create method to typecast, refer the docs here for more details.
I've EAR applications which run fine in JBOSS EAP 6.3. When I run this application in EAP 7, then ajax call response is empty after few call. Mainly jsp page calls servlet using ajax. I use common code snippet for AJAX call. I can get response properly first 3/4 times. After that it is not working. The whole thing is working fine in EAP 6.3.
The ajax code snippet is as follows:
try{
objXMLHTTP = new XMLHttpRequest();
}catch(e){
try {
objXMLHTTP = new ActiveXObject("MSXML2.XMLHTTP.3.0");
}
catch(e){
try {
objXMLHTTP = new ActiveXObject("MSXML2.XMLHTTP");
}
catch(e) {
try {
objXMLHTTP = new ActiveXObject("Microsoft.XMLHTTP");
}
catch(e) {
alert("XMLHTTP Not Supported On Your Browser");
return;
}
}
}
}
var urlstr = "" ;
var key = "";
var j = 0;
//dataStore is an array of key/value pair.
for(key in dataStore){
if(j == 0) {
urlstr += key + "=" + dataStore[key];
j = 1;
} else {
urlstr += "&" + key + "=" + dataStore[key];
}
}
var _dateTime = new Date().getTime();
urlstr += "&CALLTIME=" + _dateTime + "-";
var requNumber = "?requNumber=" + _dateTime;
// http request has been changed as Parameterised
var _AsyncRequest = true;
try{
if(_httpMode == "undefined")
_httpMode = "0";
}catch(e){
_httpMode = "0";
}
if((_httpMode != "undefined") && (_httpMode != null) && (_httpMode == "1"))
{
_AsyncRequest = false;
}
if(!document.all)
{
_AsyncRequest = false;
}
if(urlstr.length<=1000) {
objXMLHTTP.open("POST","XMLDHTTPServlet" + requNumber + "&" + urlstr,false);
} else {
objXMLHTTP.open("POST","XMLDHTTPServlet" + requNumber,false);
}
urlstr = URLEncode(urlstr);
objXMLHTTP.setRequestHeader("content-type", "application/x-www-form-urlencoded") ;
//The following is not working after few calls
if(urlstr.length<=1000) {
objXMLHTTP.send("");
} else {
objXMLHTTP.send(urlstr);
}
rtnXML = objXMLHTTP.responseText;
if (objXMLHTTP.statusText == "OK" )
// This condition fails after successive requests
{
//Code
}
Following is in JSP page to call the AJAX. Most importantly, when I put the character **|**, then response in empty and objXMLHTTP.statusText shows Bad Request in EAP 7. But EAP 6, it is working fine.
var objXMLApplet = new xmlHTTPValidator();
objXMLApplet.clearMap();
objXMLApplet.setValue("Package", "panaceaFLweb.getMenuInfo.ReadInfo");
objXMLApplet.setValue("ValidateToken","true");
objXMLApplet.setValue("Method", "chkEODStatus");
objXMLApplet.setValue("BRNCH_CODE",BranCode);
objXMLApplet.setValue("CURR_BUSS_DATE",CBD);
objXMLApplet.setValue("DataTypes","S|S");
objXMLApplet.sendAndReceive();
It is because character | present in URL post request and didn't encode the string which length is less than 1000. Just use
urlstr = URLEncode(urlstr);
before if/else condition of connection open.
Code snippet are as follows:
urlstr = URLEncode(urlstr);
if(urlstr.length<=1000) {
objXMLHTTP.open("POST","XMLDHTTPServlet" + requNumber + "&" + urlstr,false);
} else {
objXMLHTTP.open("POST","XMLDHTTPServlet" + requNumber,false);
}
objXMLHTTP.setRequestHeader("content-type", "application/x-www-form-urlencoded") ;
if(urlstr.length<=1000) {
objXMLHTTP.send("");
} else {
objXMLHTTP.send(urlstr);
}
rtnXML = objXMLHTTP.responseText;
And URLEncode function definition are as follows:
function URLEncode(urlstr ){
var SAFECHARS = "0123456789" + "ABCDEFGHIJKLMNOPQRSTUVWXYZ" + "abcdefghijklmnopqrstuvwxyz" + "-_.!~*'()=?&";
var HEX = "0123456789ABCDEF";
var plaintext = urlstr;
var encoded = "";
for (var i = 0; i < plaintext.length; i++ ) {
var ch = plaintext.charAt(i);
if (ch == " "){
encoded += "+";
}else if (SAFECHARS.indexOf(ch) != -1) {
encoded += ch;
}else {
var charCode = ch.charCodeAt(0);
if (charCode > 255) {
encoded += "+";
}else {
encoded += "%";
encoded += HEX.charAt((charCode >> 4) & 0xF);
encoded += HEX.charAt(charCode & 0xF);
}
}
}
return encoded;
}
Using the Ace Code Editor can I lock or make readonly a segment of code but still allow other lines of code to be written or edited during a session?
Here is the start of a solution:
$(function() {
var editor = ace.edit("editor1")
, session = editor.getSession()
, Range = require("ace/range").Range
, range = new Range(1, 4, 1, 10)
, markerId = session.addMarker(range, "readonly-highlight");
session.setMode("ace/mode/javascript");
editor.keyBinding.addKeyboardHandler({
handleKeyboard : function(data, hash, keyString, keyCode, event) {
if (hash === -1 || (keyCode <= 40 && keyCode >= 37)) return false;
if (intersects(range)) {
return {command:"null", passEvent:false};
}
}
});
before(editor, 'onPaste', preventReadonly);
before(editor, 'onCut', preventReadonly);
range.start = session.doc.createAnchor(range.start);
range.end = session.doc.createAnchor(range.end);
range.end.$insertRight = true;
function before(obj, method, wrapper) {
var orig = obj[method];
obj[method] = function() {
var args = Array.prototype.slice.call(arguments);
return wrapper.call(this, function(){
return orig.apply(obj, args);
}, args);
}
return obj[method];
}
function intersects(range) {
return editor.getSelectionRange().intersects(range);
}
function preventReadonly(next, args) {
if (intersects(range)) return;
next();
}
});
see it working in this fiddle: http://jsfiddle.net/bzwheeler/btsxgena/
The major working pieces are:
create start and end ace anchors which track the location of a 'readonly' portion as the document around it changes.
create a range to encapsulate the anchors
add a custom keyhandler to check if the current impending keypress will affect the readonly range and cancel it if so.
add custom paste/cut handlers to protect against right-click menu and browser menu cut/paste actions
You can do it by listening to the exec events:
// Prevent editing first and last line of editor
editor.commands.on("exec", function(e) {
var rowCol = editor.selection.getCursor();
if ((rowCol.row === 0) || ((rowCol.row + 1) === editor.session.getLength())) {
e.preventDefault();
e.stopPropagation();
}
});
Source: https://jsfiddle.net/tripflex/y0huvc1b/
I suggest something else easier and more reliable to prevent range to be modified (check it!)
var old$tryReplace = editor.$tryReplace;
editor.$tryReplace = function(range, replacement) {
return intersects(range)?null:old$tryReplace.apply(this, arguments);
}
var session = editor.getSession();
var oldInsert = session.insert;
session.insert = function(position, text) {
return oldInsert.apply(this, [position, outsideRange(position)?text:""]);
}
var oldRemove = session.remove;
session.remove = function(range) {
return intersects(range)?false:oldRemove.apply(this, arguments);
}
var oldMoveText = session.moveText;
session.moveText = function(fromRange, toPosition, copy) {
if (intersects(fromRange) || !outsideRange(toPosition)) return fromRange;
return oldMoveText.apply(this, arguments)
}
outsideRange = function (position) {
var s0 = range.start;
if (position.row < s0.row || (position.row == s0.row && position.column <= s0.column)) return true; // position must be before range.start
var e0 = range.end;
if (position.row > e0.row || (position.row == e0.row && position.column >= e0.column)) return true; // or after range.end
return false;
}
intersects = function(withRange) {
var e = withRange.end, s0 = range.start, s = withRange.start, e0 = range.end;
if (e.row < s0.row || (e.row == s0.row && e.column <= s0.column)) return false; // withRange.end must be before range.start
if (s.row > e0.row || (s.row == e0.row && s.column >= e0.column)) return false; // or withRange.start must be after range.end
return true;
}