Nat  Grady

Nat Grady


Develop Event Driven Application using ZIO Actors

What is ZIO :

ZIO is a cutting-edge framework for creating cloud-native JVM applications. ZIO enables developers to construct best-practice applications that are extremely scalable, tested, robust, resilient, resource-safe, efficient, and observable thanks to its user-friendly yet strong functional core.

Difference between Akka and ZIO :

Akka and ZIO are both the libraries in Scala for building concurrent, scalable, and fault-tolerant applications.

Akka is a toolkit and runtime for building highly concurrent, distributed, and fault-tolerant systems. It provides actors, which are lightweight units of computation that communicate with each other by exchanging messages. Akka also includes tools for clustering, routing, and persistence, making it well-suited for building reactive applications.

On the other hand, ZIO (ZIO stands for “ZIO Is Our”) is a purely functional library that provides a type-safe and composable way to write concurrent and asynchronous code. It provides a set of abstractions such as fibers, which are lightweight threads that can be composed to create complex applications, and effects, which are immutable and composable descriptions of side-effecting computations. ZIO also includes a powerful concurrency model and support for asynchronous IO operations.

Why ZIO over Akka :

ZIO and Akka are both powerful frameworks for building concurrent and distributed applications in Scala. However, there are some reasons why we might choose ZIO over Akka:

  1. Type safety: ZIO is a purely functional framework that uses the type system to enforce safe concurrency and parallelism. This makes it easier to reason about our code and catch errors at compile time rather than runtime.
  2. Lightweight: ZIO is a lightweight library that is easy to learn and use. It has a smaller API surface area than Akka and doesn’t require as much boilerplate code.
  3. Performance: ZIO is highly optimized for performance, with a low overhead for thread management and minimal context switching. It also provides fine-grained control over scheduling and thread pools.
  4. Compatibility: ZIO is fully compatible with existing Scala and Java libraries, making it easy to integrate into existing projects.

ZIO Actors :

In ZIO, actors are implemented as a type of fiber, which is a lightweight thread that can be run concurrently with other fibers. An actor is essentially a fiber that can receive messages and react to them.

To create an actor in ZIO, one of the way is we can use the actor.make method, which takes a function that defines the behavior of the actor. The function takes two parameters: the first one is the initial state of the actor, and the second one is the message that the actor receives.

Developing a Ticket Booking System using ZIO Actors –

To create some actor system in ZIO, we need to add some ZIO related dependencies in build.sbt. Check below for the dependency which we have used-

libraryDependencies ++= Seq(

  "dev.zio" %% "zio" % zioVersion,

  "dev.zio" %% "zio-streams" % zioVersion,

  "dev.zio" %% "zio-kafka" % "2.0.7",

  "dev.zio" %% "zio-json" % "0.4.2",

  "dev.zio" %% "zio-dynamodb" % "0.2.6",

  "dev.zio" %% "zio-test" % zioVersion,

  "dev.zio" %% "zio-actors" % "0.1.0",

  "dev.zio" %% "zio-http" % "0.0.4",

  "dev.zio" %% "zio-http-testkit" % "0.0.3",

  "io.d11" %% "zhttp" % "2.0.0-RC11"


Architecture and Flow Diagram (Ticket Booking System) :

Then moving forward to codebase, we have introduced ZIO actor in such a way that there is an integration of kafka consumer, kafka producer which is is working parallely with all the actors.
Lets define a main actor for the TicketBookingSystem.

  object TicketBookingSystem extends ZIOAppDefault {

  val actorSystem = ActorSystem("ticketBookingSystem")

  def run = {

    println("starting actor system ")

    for {

      ticketInfoConsumerProducer <- KafkaConsumer.consumerRun.fork

      _ <- ticketInfoConsumerProducer.join

    } yield ()



Here, we are initializing Kafka Consumer.

  def consumerRun: ZIO[Any, Throwable, Unit] = {
  println("starting KafkaConsumer ")

    val finalInfoStream =


        //create a kafka consumer here with respect to a particular topic

          for {

            theatreActor <- actorSystem.flatMap(x => 

x.make("ticketBookingflowActor", zio.actors.Supervisor.none, (), 


            theatreActorData <- theatreActor ! ticketBooking

          } yield theatreActorData






      finalInfoStream.runDrain.provide(KafkaProdConsLayer.consumerLayer ++ 



In Kafka Consumer, we are passing booking information to the theatre actor by using tell method (!). This actor will process the data and fetch the payment details and confirm ticket and pass on to next actor.

TheatreActor implementation for TicketBookingSystem –

This is one of the way we can create actor system and various other actors and can link them using ask or tell method.In our code, we have added our first actor in kafka consumer itself, which is getting triggered. And from there, we can get access to our next actors.

object ThreatreActor {

  val theatreActor: Stateful[Any, Unit, ZioMessage] = new Stateful[Any, Unit, 

ZioMessage] {

    override def receive[A](state: Unit, msg: ZioMessage[A], context: 

Context): Task[(Unit, A)] =

      msg match {

        case BookingMessage(value) => {

          println("ThreatreActor ................" + value)

          val ticketConfirm= Booking(value.uuid, value.bookingDate, 

value.theatreName, value.theatreLocation, value.seatNumbers, 


            value.cvv, value.otp, Some("Success"), Some("Confirmed"))


            paymentActor <- actorSystem.flatMap(x => 

x.make("paymentGatewayflowActor", zio.actors.Supervisor.none, (), 


            paymentDetails <- paymentActor ? BookingMessage(value)

            bookingSyncActor <- actorSystem.flatMap(x => 

x.make("bookingSyncActor", zio.actors.Supervisor.none, (), bookingSyncActor))

            _ <- bookingSyncActor ! BookingMessage(ticketConfirm)

          }yield {

            println("Completed Theatre Actor")



        case _ => throw new Exception("Wrong value Input")




This code will take us to paymentActor which is written as below –

PaymentActor implementation for TicketBookingSystem –

object PaymentGatewayActor {

   val paymentGatewayflowActor: Stateful[Any, Unit, ZioMessage] = new 

Stateful[Any, Unit, ZioMessage] {

    override def receive[A](state: Unit, msg: ZioMessage[A], context: 

Context): Task[(Unit, A)] =

      msg match {

        case BookingMessage(value) =>

          println("paymentInfo ................" + value)

          val booking = Booking(value.uuid, value.bookingDate, 

value.theatreName, value.theatreLocation, value.seatNumbers, 


            value.cvv, value.otp, Some("Success"), Some(""))

          for {

            bookingSyncActor <- actorSystem.flatMap(x => 

x.make("bookingSyncActor", zio.actors.Supervisor.none, (), bookingSyncActor))



            println("paymentInfo return................" + booking)

            ( BookingMessage(booking), ())


        case _ => throw new Exception("Wrong value Input")




The same theatreActor will take us to bookingSyncActor which is written as below –

bookingSyncActor implementation for TicketBookingSystem –

  val bookingSyncActor: Stateful[Any, Unit, ZioMessage] = new Stateful[Any, 

Unit, ZioMessage] {

    override def receive[A](state: Unit, msg: ZioMessage[A], context: 

Context): Task[(Unit, A)] =

      msg match {

        case BookingMessage(value) =>

          println("bookingSyncActor ................" + value)

          for {

            _ <- KafkaProducer.producerRun(value)

            _ <- f1(value).provide(








  } // plus some other computations.

These different actors will collect some info from the base case class and will give some relevant info regarding the individual actors.

Sending a response back to client –

For reply message, the producer is producing the data on a different topic (reply message)

          for {
           _ <- KafkaProducer.producerRun(value)

           //logic for db

          } yield((),())

Ticket Booking System Test Case :

Sure, Lets check how to test our actors using unit test.

For the above theatreActor code, we have created theatreActorSpec which can be written in this simple format. We can check if the data entered is getting correct in the actor or not.

object ThreatreActorSpec extends ZIOAppDefault{

  val data: Booking =

  override def run: ZIO[Any with ZIOAppArgs with Scope, Any, Any] =

    for {

      system <- ActorSystem("ticketBookingSystem")

      actor <- system.make("ticketBookingflowActor", Supervisor.none, (), 


      result <- actor !  BookingMessage(data)


    yield result


To run this service –

  • Setup broker
  • Run Actor Service
  • Run Producer

Conclusion :

In conclusion, ZIO Actors is a powerful and efficient library for building concurrent and distributed systems in Scala. It provides a lightweight and type-safe approach to concurrency, allowing developers to easily model their domain-specific concurrency needs without the complexities of traditional actor systems. With its advanced features such as location transparency, message interception, and supervision, ZIO Actors simplifies the development and deployment of highly scalable and fault-tolerant distributed applications.

Here, we created various actors such as theatre actor, payment actor and booking sync actor which are working as per their logic. Also, we tried to implement ZIO actors with ZIO kafka and this is a very good example of this simple integration.

Additionally, its integration with the ZIO ecosystem allows for seamless composition with other functional libraries, providing developers with a powerful and cohesive toolkit for building robust and maintainable software. For more blogs, please refer here . For more ZIO blogs, refer here

Original article source at:

#scala #event #application #actors 

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Develop Event Driven Application using ZIO Actors
Chloe  Butler

Chloe Butler


Pdf2gerb: Perl Script Converts PDF Files to Gerber format


Perl script converts PDF files to Gerber format

Pdf2Gerb generates Gerber 274X photoplotting and Excellon drill files from PDFs of a PCB. Up to three PDFs are used: the top copper layer, the bottom copper layer (for 2-sided PCBs), and an optional silk screen layer. The PDFs can be created directly from any PDF drawing software, or a PDF print driver can be used to capture the Print output if the drawing software does not directly support output to PDF.

The general workflow is as follows:

  1. Design the PCB using your favorite CAD or drawing software.
  2. Print the top and bottom copper and top silk screen layers to a PDF file.
  3. Run Pdf2Gerb on the PDFs to create Gerber and Excellon files.
  4. Use a Gerber viewer to double-check the output against the original PCB design.
  5. Make adjustments as needed.
  6. Submit the files to a PCB manufacturer.

Please note that Pdf2Gerb does NOT perform DRC (Design Rule Checks), as these will vary according to individual PCB manufacturer conventions and capabilities. Also note that Pdf2Gerb is not perfect, so the output files must always be checked before submitting them. As of version 1.6, Pdf2Gerb supports most PCB elements, such as round and square pads, round holes, traces, SMD pads, ground planes, no-fill areas, and panelization. However, because it interprets the graphical output of a Print function, there are limitations in what it can recognize (or there may be bugs).

See docs/Pdf2Gerb.pdf for install/setup, config, usage, and other info.

#Pdf2Gerb config settings:
#Put this file in same folder/directory as itself (global settings),
#or copy to another folder/directory with PDFs if you want PCB-specific settings.
#There is only one user of this file, so we don't need a custom package or namespace.
#NOTE: all constants defined in here will be added to main namespace.
#package pdf2gerb_cfg;

use strict; #trap undef vars (easier debug)
use warnings; #other useful info (easier debug)

#configurable settings:
#change values here instead of in main file

use constant WANT_COLORS => ($^O !~ m/Win/); #ANSI colors no worky on Windows? this must be set < first DebugPrint() call

#just a little warning; set realistic expectations:
#DebugPrint("${\(CYAN)} ${\(VERSION)}, $^O O/S\n${\(YELLOW)}${\(BOLD)}${\(ITALIC)}This is EXPERIMENTAL software.  \nGerber files MAY CONTAIN ERRORS.  Please CHECK them before fabrication!${\(RESET)}", 0); #if WANT_DEBUG

use constant METRIC => FALSE; #set to TRUE for metric units (only affect final numbers in output files, not internal arithmetic)
use constant APERTURE_LIMIT => 0; #34; #max #apertures to use; generate warnings if too many apertures are used (0 to not check)
use constant DRILL_FMT => '2.4'; #'2.3'; #'2.4' is the default for PCB fab; change to '2.3' for CNC

use constant WANT_DEBUG => 0; #10; #level of debug wanted; higher == more, lower == less, 0 == none
use constant GERBER_DEBUG => 0; #level of debug to include in Gerber file; DON'T USE FOR FABRICATION
use constant WANT_STREAMS => FALSE; #TRUE; #save decompressed streams to files (for debug)
use constant WANT_ALLINPUT => FALSE; #TRUE; #save entire input stream (for debug ONLY)

#DebugPrint(sprintf("${\(CYAN)}DEBUG: stdout %d, gerber %d, want streams? %d, all input? %d, O/S: $^O, Perl: $]${\(RESET)}\n", WANT_DEBUG, GERBER_DEBUG, WANT_STREAMS, WANT_ALLINPUT), 1);
#DebugPrint(sprintf("max int = %d, min int = %d\n", MAXINT, MININT), 1); 

#define standard trace and pad sizes to reduce scaling or PDF rendering errors:
#This avoids weird aperture settings and replaces them with more standardized values.
#(I'm not sure how photoplotters handle strange sizes).
#Fewer choices here gives more accurate mapping in the final Gerber files.
#units are in inches
use constant TOOL_SIZES => #add more as desired
#round or square pads (> 0) and drills (< 0):
    .010, -.001,  #tiny pads for SMD; dummy drill size (too small for practical use, but needed so StandardTool will use this entry)
    .031, -.014,  #used for vias
    .041, -.020,  #smallest non-filled plated hole
    .051, -.025,
    .056, -.029,  #useful for IC pins
    .070, -.033,
    .075, -.040,  #heavier leads
#    .090, -.043,  #NOTE: 600 dpi is not high enough resolution to reliably distinguish between .043" and .046", so choose 1 of the 2 here
    .100, -.046,
    .115, -.052,
    .130, -.061,
    .140, -.067,
    .150, -.079,
    .175, -.088,
    .190, -.093,
    .200, -.100,
    .220, -.110,
    .160, -.125,  #useful for mounting holes
#some additional pad sizes without holes (repeat a previous hole size if you just want the pad size):
    .090, -.040,  #want a .090 pad option, but use dummy hole size
    .065, -.040, #.065 x .065 rect pad
    .035, -.040, #.035 x .065 rect pad
    .001,  #too thin for real traces; use only for board outlines
    .006,  #minimum real trace width; mainly used for text
    .008,  #mainly used for mid-sized text, not traces
    .010,  #minimum recommended trace width for low-current signals
    .015,  #moderate low-voltage current
    .020,  #heavier trace for power, ground (even if a lighter one is adequate)
    .030,  #heavy-current traces; be careful with these ones!
#Areas larger than the values below will be filled with parallel lines:
#This cuts down on the number of aperture sizes used.
#Set to 0 to always use an aperture or drill, regardless of size.
use constant { MAX_APERTURE => max((TOOL_SIZES)) + .004, MAX_DRILL => -min((TOOL_SIZES)) + .004 }; #max aperture and drill sizes (plus a little tolerance)
#DebugPrint(sprintf("using %d standard tool sizes: %s, max aper %.3f, max drill %.3f\n", scalar((TOOL_SIZES)), join(", ", (TOOL_SIZES)), MAX_APERTURE, MAX_DRILL), 1);

#NOTE: Compare the PDF to the original CAD file to check the accuracy of the PDF rendering and parsing!
#for example, the CAD software I used generated the following circles for holes:
#CAD hole size:   parsed PDF diameter:      error:
#  .014                .016                +.002
#  .020                .02267              +.00267
#  .025                .026                +.001
#  .029                .03167              +.00267
#  .033                .036                +.003
#  .040                .04267              +.00267
#This was usually ~ .002" - .003" too big compared to the hole as displayed in the CAD software.
#To compensate for PDF rendering errors (either during CAD Print function or PDF parsing logic), adjust the values below as needed.
#units are pixels; for example, a value of 2.4 at 600 dpi = .0004 inch, 2 at 600 dpi = .0033"
use constant
    HOLE_ADJUST => -0.004 * 600, #-2.6, #holes seemed to be slightly oversized (by .002" - .004"), so shrink them a little
    RNDPAD_ADJUST => -0.003 * 600, #-2, #-2.4, #round pads seemed to be slightly oversized, so shrink them a little
    SQRPAD_ADJUST => +0.001 * 600, #+.5, #square pads are sometimes too small by .00067, so bump them up a little
    RECTPAD_ADJUST => 0, #(pixels) rectangular pads seem to be okay? (not tested much)
    TRACE_ADJUST => 0, #(pixels) traces seemed to be okay?
    REDUCE_TOLERANCE => .001, #(inches) allow this much variation when reducing circles and rects

#Also, my CAD's Print function or the PDF print driver I used was a little off for circles, so define some additional adjustment values here:
#Values are added to X/Y coordinates; units are pixels; for example, a value of 1 at 600 dpi would be ~= .002 inch
use constant
    CIRCLE_ADJUST_MINY => -0.001 * 600, #-1, #circles were a little too high, so nudge them a little lower
    CIRCLE_ADJUST_MAXX => +0.001 * 600, #+1, #circles were a little too far to the left, so nudge them a little to the right
    SUBST_CIRCLE_CLIPRECT => FALSE, #generate circle and substitute for clip rects (to compensate for the way some CAD software draws circles)
    WANT_CLIPRECT => TRUE, #FALSE, #AI doesn't need clip rect at all? should be on normally?
    RECT_COMPLETION => FALSE, #TRUE, #fill in 4th side of rect when 3 sides found

#allow .012 clearance around pads for solder mask:
#This value effectively adjusts pad sizes in the TOOL_SIZES list above (only for solder mask layers).
use constant SOLDER_MARGIN => +.012; #units are inches

#line join/cap styles:
use constant
    CAP_NONE => 0, #butt (none); line is exact length
    CAP_ROUND => 1, #round cap/join; line overhangs by a semi-circle at either end
    CAP_SQUARE => 2, #square cap/join; line overhangs by a half square on either end
    CAP_OVERRIDE => FALSE, #cap style overrides drawing logic
#number of elements in each shape type:
use constant
    RECT_SHAPELEN => 6, #x0, y0, x1, y1, count, "rect" (start, end corners)
    LINE_SHAPELEN => 6, #x0, y0, x1, y1, count, "line" (line seg)
    CURVE_SHAPELEN => 10, #xstart, ystart, x0, y0, x1, y1, xend, yend, count, "curve" (bezier 2 points)
    CIRCLE_SHAPELEN => 5, #x, y, 5, count, "circle" (center + radius)
#const my %SHAPELEN =
#Readonly my %SHAPELEN =>
    rect => RECT_SHAPELEN,
    line => LINE_SHAPELEN,
    curve => CURVE_SHAPELEN,
    circle => CIRCLE_SHAPELEN,

#This will repeat the entire body the number of times indicated along the X or Y axes (files grow accordingly).
#Display elements that overhang PCB boundary can be squashed or left as-is (typically text or other silk screen markings).
#Set "overhangs" TRUE to allow overhangs, FALSE to truncate them.
#xpad and ypad allow margins to be added around outer edge of panelized PCB.
use constant PANELIZE => {'x' => 1, 'y' => 1, 'xpad' => 0, 'ypad' => 0, 'overhangs' => TRUE}; #number of times to repeat in X and Y directions

# Set this to 1 if you need TurboCAD support.
#$turboCAD = FALSE; #is this still needed as an option?

#CIRCAD pad generation uses an appropriate aperture, then moves it (stroke) "a little" - we use this to find pads and distinguish them from PCB holes. 
use constant PAD_STROKE => 0.3; #0.0005 * 600; #units are pixels
#convert very short traces to pads or holes:
use constant TRACE_MINLEN => .001; #units are inches
#use constant ALWAYS_XY => TRUE; #FALSE; #force XY even if X or Y doesn't change; NOTE: needs to be TRUE for all pads to show in FlatCAM and ViewPlot
use constant REMOVE_POLARITY => FALSE; #TRUE; #set to remove subtractive (negative) polarity; NOTE: must be FALSE for ground planes

#PDF uses "points", each point = 1/72 inch
#combined with a PDF scale factor of .12, this gives 600 dpi resolution (1/72 * .12 = 600 dpi)
use constant INCHES_PER_POINT => 1/72; #0.0138888889; #multiply point-size by this to get inches

# The precision used when computing a bezier curve. Higher numbers are more precise but slower (and generate larger files).
#$bezierPrecision = 100;
use constant BEZIER_PRECISION => 36; #100; #use const; reduced for faster rendering (mainly used for silk screen and thermal pads)

# Ground planes and silk screen or larger copper rectangles or circles are filled line-by-line using this resolution.
use constant FILL_WIDTH => .01; #fill at most 0.01 inch at a time

# The max number of characters to read into memory
use constant MAX_BYTES => 10 * M; #bumped up to 10 MB, use const

use constant DUP_DRILL1 => TRUE; #FALSE; #kludge: ViewPlot doesn't load drill files that are too small so duplicate first tool

my $runtime = time(); #Time::HiRes::gettimeofday(); #measure my execution time

print STDERR "Loaded config settings from '${\(__FILE__)}'.\n";
1; #last value must be truthful to indicate successful load


#use Package::Constants;
#use Exporter qw(import); #

#my $caller = "pdf2gerb::";

#sub cfg
#    my $proto = shift;
#    my $class = ref($proto) || $proto;
#    my $settings =
#    {
#        $WANT_DEBUG => 990, #10; #level of debug wanted; higher == more, lower == less, 0 == none
#    };
#    bless($settings, $class);
#    return $settings;

#use constant HELLO => "hi there2"; #"main::HELLO" => "hi there";
#use constant GOODBYE => 14; #"main::GOODBYE" => 12;

#print STDERR "read cfg file\n";

#our @EXPORT_OK = Package::Constants->list(__PACKAGE__); #; NOTE: "_OK" skips short/common names

#print STDERR scalar(@EXPORT_OK) . " consts exported:\n";
#foreach(@EXPORT_OK) { print STDERR "$_\n"; }
#my $val = main::thing("xyz");
#print STDERR "caller gave me $val\n";
#foreach my $arg (@ARGV) { print STDERR "arg $arg\n"; }

Download Details:

Author: swannman
Source Code:

License: GPL-3.0 license


Event Planning App Development

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How much does it cost to build a virtual event application in 2021?

A Brief about Virtual Events
After the Covid-19 virtual event trend rising and now the demand has more increased. Digital activities are events held online in their most simplistic sense. Virtual events use web-based platforms to connect thousands of people worldwide.

Virtual events can cover anything, including individual events, but generally, four kinds of virtual events are available: virtual conferences, webinars, hybrid internal & external events. Google Meet, Evia, Digitell, ON 24, Zoom, GoToMeeting and more are among the top virtual event platforms.

Cost to Build a Virtual Event Application in 2021
The development cost of the application mostly depends on the features of a mobile application. The approx cost to build a virtual event app between $20,000 to $50,000 for a single platform (Android & iOS). It may go high if you choose the advanced technology and features while developing.

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How much does it cost to develop an app for the event planning business?

Event planning & management app is the generic term for a wide range of mobile app products that are used in the management of professional and academic conferences, trade exhibitions, conventions, and events such as Continuing Professional Development meetings.

Development Cost to build an Event Planning & Management App:

Based on the number of hours invested, features, and technologies involved, you can determine a rough estimate of Event Planning or Management app development cost. Cost depends on various factors such as follows.

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