Program Stock Barang Php Includes
You are looking at a real-time stock app that sends data from aPHP Server Process to an HTML5 JavaScript app in real-time.Stock Quotes are broadcast from the PHP Serverinto the PubNub Network where the HTML5 JavaScript appwill receive quotes data and display it in real-time.
This is a brief walkthrough of how we built the Real-time StockStreaming application using PHP and JavaScript leveraging thePubNub Real-time Network as the Data Channel broker.
The PHP Process can be run in parallel with other PHP processeswhich allows publishing of real-time quote data into the PubNub Cloud.The JavaScript HTML5 App is able to receive a user-selectedvariety of symbols.
This repository includes full app code for streaming stock quote data from PHP to a JavaScript HTML5 app. The PubNub Real-time Network offers a Globally Distributed solution for streaming real-time data to millions of users in less than 0.25 seconds. Join GitHub today. Real-time Stocks with PHP and JavaScript TRY IT NOW! Software stok barang berbasis php ini dikembang oleh mobista studio yang berguna untuk memantu mengelola stok barang perusahaan, toko, maupun bisnis lainnya. Apa saja yang bagus dari software E-Stock ini?
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This application is based on Channel Groups, History and Access Manager features.All of them can be enabled in your PubNub Admin Console.
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Data Stream Controller
Data Stream Controller feature provides PubNub developers the abilityto efficiently subscribe to multiple channels via Channel Multiplexing(MXing) and Channel Groups.
With Stream Controller your app can efficiently and effectivelystream many symbols at the same time over a singleTCP Socket Connection using Channel Groups or Channel Multiplexing features.
Without Stream Controller capability, streaming data from a group of symbolswould be impractical and impossible because each symbol would requirea dedicated TCP Socket; this does not scale.
Channel Groups
Channel Groups allows PubNub developers to bundle thousands of channels intoa 'group' that can be identified by name. These Channel Groups can then besubscribed to, receiving data from the many backend-channelsthe channel group contains.
In this app all ticker(stock) names are collected inside a 'stockblast' groupby server-side logic inside bootstrap.php script.All you need is to subscribe to this groupon client-side by specifying it's name only. All messages from channels,included into this group, will be received inside receiver callback handler.
Example Channel Group Scenario in JavaScript
In CG it's impossible to disable data transmission for a specific channel,you may only ignore these data in your code logic. If you need to havea strict control of what data should be transmitted or what not,look for Channels Multiplexing feature.
Multiplexing
Program Stock Barang Gratis
This is an another way to subscribe to tickers, especially usefulif the most of your clients are mobile devices.Channel Multiplexing can help you to reduce network and battery usage.With the PubNub JavaScript SDK, Multiplexing is always enabled andauto-optimizes the connection for each subscription issued.
Example Multiplexing Scenario in JavaScript
If you have Data Stream feature enabled you can keep channels list synchronized viachannel group but do not subscribe to the whole group (using channel_group field).Fetch the list of group's channels using channel_group_list_channels functionand subscribe to them as usual channels array using Channels Multiplexing.
If Data Stream feature is disabled, it's up to you where to store a channels list.One solution is to store the list as the last message of some channel and fetchit via history() call when needed. Another option is to store this list inexternal storage, DB, etc, but you should keep in mind that both serverand client should have access to this storage.
In all of above cases the subscription is done using Channel Multiplexing feature,the fetched channels are passed to the subscribe() function via channel field as an array.
Example Multiplexing Scenario in JavaScript
If you don't need some channel anymore, you are able to unsubscribe from itand messages on this channel will no longer be transmitted. To enable channelagain, just invoke another subscribe call and pass a channel name to the channel field.
Example of enabling/disabling specific channel subscription in JavaScript
Windowing and Gzip Compression and Tuning
There are two important tuning levers available to you with thePubNub JavaScript SDK for improved performance vs reduced bandwidth.Consider the compression ratio savings to latency opportunity.With windowing you receive the opportunity to reduce bandwidth consumeddrastically by allowing messages to be bundled.
This Bundle of Messages is allowed to accumulate on the network bufferbefore the client receives an update.This is a good thing as we have the opportunity now tohighly compress the data using streaming GZIP compression.This combination of windowing and gzip compressing provides high throughputat low bandwidth costs; savingyou and your end-consumers a lot of bandwidth.
Here follows the details on how to access this windowing featurealong with a general expected rate of messages per second.
Note that the lower the windowing value the less compression opportunityand the higher the value the more latency is allowed for bundled messageswith high compression ratios.The provided numbers above are recommended for streaming stock symbols.
PubNub Keys
Along with demo keys you can specify the custom ones. For Real Time Stocks appthere are two places where you should put them.
First, export an environment variables to your server console session from whichyou will run bootstrap.sh and go.sh scripts. There is a bootstrapped .env fileinside php-bootstrapping folder that helps to do it. Replace environmentvariables in this file with yours and source this file with . .env console command.
Example of .env file
You can provide PubNub keys to JS client by the way you want, even just hardcodethem inside your HTML, JS code. The current example app uses Apache serverand PHP to share these keys sharing them as a JSON object like{'publish_key': 'your_pub_key', 'subscribe_key': 'your_sub_key'}.To not publish PubNub keys inside source code control system, it's better tokeep it inside Apache .htaccess or similar env variables storage for other servers.
Example of .htaccess file
The reason is that your source control system should ignore this file.
According to client-side logic, if web server is down or other HTTP erroris happened, client will fall back to the default demo/demo keys,so serving PubNub keys via dynamic web-server is not necessarily.
PHP Server Broadcaster
The PHP server code included in the php-broadcaster directory.To get started you'll execute the server logic as follows:
PHP Example with MSFT stock
This example launches the stock streamer with default starting values:
This example will launch the PHP process in a screen session whichstarts transmitting randomized variants based on the starting args.This is a good starting point for you and easy to see whereyou can easily begin to insert other types of data oreven an alternative stock stream source.
For further details on how we run this PHP code, you can review ourgo.sh bash shell script which runs multiple instances of thePHP process for each stock ticker:
Non-screen Example
This is a simple non-GNU-screen example of running the PHP Process.
HTML5 Client Bootstrapping
For the server which is providing all the quote streams, you can usethe bootstrap.sh file in the php-broadcaster directoryto bootstrap the available symbol streams. Shell script is a wrapperthat adds PubNub credentials from .env file to bootstrap.php call.Just execute the script after you've launched or changed new PHP Streams:
This will look for all running stock.php processes and add their namesinto stockblast channel group. HTML5 app will subscribe this group later.
Program Stock Barang Php Includes Directory
NOTE: You must have running stock.php processes on the same machine.
The client HTML5 JavaScript App will execute:
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This will bootstrap the client based on what was running on your serverat the time of running ./bootstrap.php command.
History
This application uses a pubnub.history() call to loadthe history of the chat conversations.
Backfill
This application also demonstrates the capability to opportunistically preloada message bundled with most recently streamed symbol updates.This is an optimization and also makes it easier to pre-load data from themultiplexed stream very quickly rather than waiting for updatesto piece together the stream one-by-one which causes the UI to stagger for afew moments as it builds the display.Therefor Backfill is a great optimization in performance and usability!
Download Program Stock Barang
Simple Embedded Chat Application
Also provided here in this stock demo is a basic chat which allowsyou to communicate with a group of collaborators in real-time.The chat stream is separate from the stock symbol ticker stream.
NOTE: This is a basic chat where you can find the integratedsource code currently inside script.js JavaScript source file.
Here is the full source code for the chat example:
Followed by the JavaScript code which uses the id= fieldsto bind user events and as display output blocks on the screen:
PubNub Access Management
PubNub provides builtin enterprise-grade security with fine-grained access control to allof your PubNub applications with PubNub Access Manager, Message Layer encryption with AES256,and Transport Layer Security with TLS and SSL. Before using this feature it must be enabledin the PubNub Admin Console.
Real-Time Stocks app uses this feature to control access to channels and channel groups.Permissions for stock tickers and front-end client are assigned inside bootstrap.php script.
The stockblast channel group should be accessible for listening for all unauthorizedusers, but only the server-side bootstrapping script (bootstrap.php) should have permissionsto manage this group, i.e. adding or removing channels from it.
If you use Channel Multiplexing instead of Channels groups, you need to grant read permissionson a ticker channels (like 'GOOG', 'FB', etc.) for all unidentified users and leave off grantingpermissions for the stockblast channel group.
The write permissions should be granted on the same channels for tickers (stock.php)with pre-defined in environment variables auth_key.
On the main page of Real-Time Stocks example you can also find history and chat examples.To load history you need only read permissions while for chatting app all unauthorizedusers should be able both to read and to write.
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