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Previous Chapter

Chapter 12. Scalable and distributed applications using Akka

List of Figures

Index

[SYMBOL][A][B][C][D][E][F][G][H][I][J][K][L][M][N][O][P][Q][R][S][T][U][V][W][X]

SYMBOL

_200 function _404 function . operator .jar files + function ++ function, 2^nd ++= method == method => sign ~/bin folder

A

abstract members Abstract method abstract modifier abstract type annotation abstraction techniques access principles Account type, 2^nd ACID (atomicity, consistency, isolation, durability) Active object Actor API Actor class actor library migrating to Akka Actor model actor path actor system actor path guardian actor shutting down all actors threads executing. See also ActorSystem. actor, and blocking operation ActorDSL ActorRef actors divide-and-conquer pattern guardian handling a message how they work in Akka defining remote actors in Akkaoogle application example no direct reference sending message to separating blocking and nonblocking vs using Future when not to use ActorSystem creating an actor ad hoc polymorphism, with type classes modeling orthogonal concerns using solving expression problem using add function addOne function addThree function Administrable trait ADTs (algebraic data types) advantages, of functional programming, 2^nd Agent, handling shared resources with Agha, Gul AkkaoogleActorServer, 2^nd, 3^rd AkkaoogleSchema object algebraic data types. See ADTs. All-for-One andThen method, 2^nd AngryMood trait annotations, Scala classes in Java AnyRef AnyVal Application trait application.conf file application-context.xml file applications connecting to databases saving to using Squeryl creating web pages for Kanban boards creating views for defined moving cards in setting up project with SBT SBT adding dependencies build file for for Mac for Unix for Windows project structure for Scalaz HTTP module configuring with SBT overview setting up servlet apply method, 2^nd, 4^th, 7^th, 8^th and cons method in Map treat object as a function object applyCostPlusBusinessRule method applyOptions function applyPercentage arbitrary generator arguments ArithmeticException Array class ArrayList() method arrays Arrays.asList method Artist object ArtistDb class ArtistDb.scala database ArtistRepository class Ask pattern asynchronous HTTP, with Play2-mini asynchronous messaging systems, testing ATaxStrategy atomic method atomicDelete function atomicInsert function atomicity atomicity, consistency, isolation, durability. See ACID. Awaitility

B

BalancingDispatcher BasicDBObject() method, 2^nd BasicResponseHandler() method Bean property @BeanProperty annotation beEqualTo matcher behavior-driven development specifications for using Specs2 board example, Kanban creating view for moving cards in BookOrdering object Boolean parameter BTaxStrategy Budd, Timothy build file, for SBT build.properties file, 2^nd, 3^rd build.sbt file, 2^nd, 3^rd, 4^th build.scala file, 2^nd, 3^rd builder.toString() method byte code, Java Byte type

C

c.countWords() method cake pattern, dependency injection calculatePrice method, 2^nd, 3^rd CalculatePriceService class, 2^nd Calculator trait calculus call-by-name call-by-reference call-by-value CallingThreadDispatcher CanadaContractorPayrollSystem CanadaPayroll method case classes, 2^nd and pattern matching companion object option. See also value classes. case keyword catch block challenges, of concurrent programming new trends in concurrency shared-state concurrency with threads Char type Char.MAX_VALUE Char.MIN_VALUE character types CheapestDealFinder checked exceptions, Java classes in Scala CI (continuous integration) claimHandlers claimId class linearization, 2^nd close method closure function, 2^nd CLR (Common Language Runtime) CMSClassUnloadingEnabled flag codomain collection.immutable.List, 2^nd collection.mutable.ListBuffer, 2^nd collection.mutable.Map package collection.mutable.Set[String]() method com.akkaoogle.http.App com.kanban.application.WeKanbanApplication com.mongodb package com.mongodb.Mongo class com.scalainaction.mongo package com.typesafe.play.mini.Setup Common Language Runtime. See CLR. companion objects, overview components abstract type annotation and type classes modeling orthogonal concerns using solving expression problem using and types in Scala higher-kinded types phantom types structural types extensible components challenge of solving expression problem scalable components self type annotation composability, 2^nd composition, of functions compute function computing nodes concreteFactory variable concurrent programming challenges of new trends in concurrency shared-state concurrency with threads defined using actors with actors, when not to use Configuration file cons(::) method consistency console-project task constructors and classes copy constructors overloading container:start task ContentType object continuous integration. See CI. Contractor type ContractorPayrollVisitor contravariant, 2^nd copy constructors copy method, 2^nd core modules, Akka CostPlusCalculator() method countWords method covariance CPU core create a new Story screen create, read, update, delete. See CRUD operations. createDB method createSchema() method, 2^nd CreateStory view object, 2^nd, 3^rd, 4^th CRUD (create, read, update, delete) operations currentTime function currying functions cursor.hasNext() method, 2^nd cursor.next() method, 2^nd

D

d.getDays() method data loader data transfer object. See DTO. databases, for web applications saving to using Squeryl dataflow concurrency dataflow variables DataTables trait Date class DateTime.now() method DB class, 2^nd, 3^rd db method DB.apply(underlying.getDB(name)) function DB.scala file DB(underlying.getDB(name)) function DBCollection class, 2^nd DBCollection.scala file DbConnection DBObject parameter declaring packages decorators def keyword default arguments default constructor default-afcdbe project DefaultHttpClient() method, 2^nd DELETE method Delete method dependencies, in SBT DI (dependency injection), 2^nd cake pattern implicit parameters in functional style structural typing using Spring framework dispatchers, in Akkaoogle application example distributed computing divide and conquer doctype documentation DogMood trait domain models, in Akkaoogle application example domains domain-specific See language DSL don’t-repeat-yourself code. See DRY. draggable method Driver class DRY (don’t-repeat-yourself) code DSL DTO (data transfer object) dynamic languages, transitioning from Dynamic type dynamic typing

E

e.hasMoreElements() method e.withFilter efficiency Elem type EmployeePayrollVisitor end-to-end test environment, for test-driven development equals method Erlang error detection errorLogger() method eta-expansion evenFilter event-based actors exception handling overview extensible components challenge of solving expression problem extensible languages, Scala as external load balancer ExternalPriceCalculator, 2^nd, 3^rd external-price-calculator-actor-dispatcher externalPriceSource externalPriceSourceCalculator, 2^nd ExternalVendor, 2^nd ExternalVendor.findAll ExternalVendorProxyActor, 2^nd Extractor object, 2^nd

F

F[_] type factory pattern fault tolerance File class file.getName() method FileToCount type, 2^nd filter method, 2^nd find method findAllByPhase method, 2^nd findAllStoriesByPhase method findByDescription, 2^nd findCalculator function finder method, 2^nd findLowestPrice method findOne method, 2^nd FindPrice message, 2^nd, 3^rd firstName parameter flatMap function, 2^nd floating-point types foldLeft method, 2^nd, 3^rd foldRight method, 2^nd forAll method for-comprehensions overview using with collections fork-join fullClasspath Function type Function1 trait functional languages, Scala as Functional Object pattern functional objects functional programming, 2^nd ADTs advantages of, 2^nd defined function composition function currying higher-order functions methods vs. functions monads managing state using methods used with moving from OOP to modeling purely functional programs object-oriented patterns pure vs. impure programming partial functions pure functional programs recursion in functional style, dependency injection Future divide and conquer mixing with actors vs using actors

G

Gen class, 2^nd, 3^rd GenTraversableOnce, 2^nd GET method Get method getChronologyUsed() method getCount method getEntity() method getName() method getOrElse method getOrElseUpdate method getResource() method gets method getSender() method Global object greet method GreetingsActor

H

handle method head :: tail head recursion Hewitt, Carl hierarchy of classes of collections of parallel collections higher-kinded types, 2^nd higher-order functions, 2^nd Hindley-Milner type host parameter HTTP method, 2^nd, 3^rd http.proxy environment variable HttpClient library HttpGet method HttpServlet HttpServletRequest Hughes, John

I

I/O monad identifiers immutable collections immutable data, vs. mutable immutable objects implicit conversion implicit keyword implicit parameters dependency injection overview, 2^nd implicits import statements importance, of testing impure programming, vs. pure programming InCompleteOrder Infix Operation pattern init() method, 2^nd, 3^rd, 4^th input Int object Int type, 2^nd, 3^rd integer types Integer.parseInt integration test, 2^nd, 3^rd interactive mode internal load balancer InternalPriceCalculator, 2^nd, 3^rd InternalPriceCalculatorActor internal-price-calculator-actor-dispatcher interoperability with Java Java classes in Scala checked exceptions generics static members Scala classes in Java Scala web applications using Java frameworks model, view, controller using Spring configuration inTransaction method, 2^nd invariant, 2^nd io.monads package IOMonad type IOResource isDefinedAt method isEmpty method isLeft method isolation isRight method Iterable trait

J

JapanPayroll method JAR file Java byte code Java class Java Database Connectivity. See JDBC. Java driver, 2^nd, 3^rd, 4^th Java interface, 2^nd Java Virtual Machine. See JVM. java.io.File class java.lang.Thread class java.sql package java.sql.Date java.util.concurrent package java.util.Date() method, 2^nd JavaConversions object JavaScript Object Notation. See JSON. JDBC (Java Database Connectivity) jetty-run build action jettyVersion jquery-ui library JSON (JavaScript Object Notation) JUnit, test-driven development using junitInterface

K

Kanban boards board defined setting up project with SBT example creating view for moving cards in view object KanbanBoard() method KanbanSchema class, 2^nd KanbanSchema.scala file Kay, Alan Kestrel KeyedEntity trait

L

lambda calculus lambda function languages() method lastName parameter lazy collections and Stream class converting strict collections to leftValueGenerator, 2^nd libraryDependencies, 2^nd, 3^rd, 4^th Limit option linearization LinearSeq type List class List collection, overview List.WithFilter List() method ListBuffer, overview lists load balancers loadArtists() method loan pattern locale field LocaleAware trait logStep method LogTimeout message, 2^nd logTimeout method Long type loopTill construct Lotus Notes, IBM

M

m.keys m.values Mac, SBT on main.js file, 2^nd Map collection, overview map function, 2^nd Map type Mapper trait mathematical functions Maybe class, 2^nd Maybe construct Maybe.scala, 2^nd memoization Memoizer trait message passing concurrency with actors message routing, in Akkaoogle application example MessageDispatcher messageFromFuture() method message-oriented concurrency method dependent type method invocations, overview MethodParts.unapply microworlds, 2^nd minus sign Mixin composition, 2^nd modeling, pure functional programs modifiers modify method, 2^nd modifyPriceState, 2^nd modular mixin composition monadic laws monads managing state using methods used with Mongo class Mongo driver, 2^nd MongoClient class, 2^nd, 3^rd MongoClient.scala MongoDB database driver for in Scala overview, 2^nd, 3^rd monitor actor, 2^nd Moore’s law moveCard function, 2^nd moveTo method, 2^nd Movie class MovieConverterWithoutRating msg message multicore processors and Moore’s law programming for multi-paradigm languages, Scala as mutable collections mutable data, vs. immutable data mutable.ArrayBuffer mutable.ListBuffer mydb database myFirstMethod() method MyScript class

N

name() method named arguments nano-http-server project NanoHttpServer.scala nanoTime method new keyword newFunction.apply Nil class, 2^nd, 3^rd NoAddress NoItem nonduplicate element NoOption() method, 2^nd NotFound class Null object NullPointerException

O

<object>.apply() method <object>(<arguments>) Object Relational Mapping. See ORM. object-oriented languages, Scala as object-oriented programming. See OOP. objects, overview Odersky, Martin One-for-One OOP (object-oriented programming) modeling purely functional programs object-oriented patterns pure vs. impure programming operations, CRUD Option type, 2^nd, 3^rd OPTIONS method Order type OrderingService() method OrderingSystem orderSavedInDatabase orElse block orElse method org.scalacheck.Gen class org.scalacheck.Prop trait org.scalacheck.Prop.forAll org.scalacheck.Properties org.squeryl.Query class org.squeryl.Schema org.squeryl.Table class, 2^nd organizationHomePage ORM (Object Relational Mapping) OUT[_] type Outer class output overloading constructors override modifier, 2^nd

P

package object package.scala file packages declaring overview parallel collections hierarchy of switching between sequential and parallel programming param method parameters, implicit, 2^nd parametric polymorphism parsedMessage() method PartialFunction, 2^nd, 3^rd PATH variable pattern matching, 2^nd Payroll interface Payroll type, adding for Japan PayrollProcessorsExtension object PC (Pricing Criteria) Persistable interface Persistable.class file persistence data structures Person class, 2^nd, 3^rd phantom types PinnedDispatcher pipeTo pattern placeOrder plain old Java object. See POJO. play.core.server.NettyServer Play2-mini, asynchronous HTTP with plus sign POJO (plain old Java object) POM (Project Object Model) files pom.xml file popMessageFromASlowQueue() method port parameter position function, 2^nd POST method Post method Predef class, 2^nd priceCalculator method Pricing Criteria. See PC. primary constructors, 2^nd, 3^rd, 4^th, 5^th printAccountDetails private modifier processContractors method, 2^nd processEmployees method, 2^nd processPayroll method Product class productivity, improvements to when transitioning from Java Products table Programmer class project definition, debugging Project Object Model files. See POM. project structure, for SBT Promise create a Future Prop.forAll method Properties class protected modifier pure functional languages pure functions pure programming, vs. impure programming PureSquare object

Q

Querulous Query class, 2^nd, 3^rd

R

r.dispose() method Random class Random() method read-evaluate-print loop. See REPL. ReadOnly trait, 2^nd recursion, in functional programming red-green-refactor cycle, 2^nd redirects method Ref object refactoring referential transparency, 2^nd, 3^rd refresh() method remote actors, in Akka Remote interface removeDups function REPL (read-evaluate-print loop), in Scala interpreter Representational State Transfer. See REST. request handler Request object, 2^nd request.getHeaderNames() method request.getParameterNames() method RequiredServices trait resolvers key @Resource annotation ResourceLocator type Response object, 2^nd, 3^rd response.getWriter() method REST (Representational State Transfer) client example retrieveAndLoadArtists() method Return parameter Rich type RichConsole object, 2^nd rightValueGenerator, 2^nd RMI interface root_package RoundRobinRouter routees run() method RunPayroll object RunWith annotation

S

SalesPerson trait save() method saveStory method implementing overview SBT (Simple Build Tool), 2^nd adding dependencies build file for command, 2^nd for Mac for Unix for Windows project structure for sbt compile run command sbt.Keys object sbt.version key sbtVersion key scala.Any class, 2^nd, 3^rd scala.AnyRef class scala.collection package, 2^nd scala.collection.immutable package immutable for everyone overview scala.collection.Iterator scala.collection.mutable package scala.collection.parallel.Splitter trait scala.collection.Stream, 2^nd scala.Either class, 2^nd, 3^rd scala.Function1 class scala.Function1 trait scala.io.Source package, 2^nd scala.Nothing type, 2^nd, 3^rd scala.Null type scala.Option type scala.ScalaObject trait, 2^nd scala.util package scala.xml.NodeSeq object, 2^nd scalable components scalable languages, Scala as ScalaCheck example of generators for testing string behavior scalacOptions scalaMiniProject method ScalaObject trait ScalaQuery scala-version command scalaz.http.InputStreamer scalaz.http.response.OK class scalaz.http.servlet.ScalazServlet scalaz.http.servlet.ServletApplication scalaz.http.servlet.StreamStreamServlet scalaz.http.servlet.StreamStreamServlet-Application trait ScalazServlet, 2^nd, 3^rd scalazVersion scheduleShipping method Schema class, 2^nd schemas, in MongoDB scoping approach search cheapest product select function selectDynamic self type annotation and placeOrder method and product finder common annotation names sendOff method sequential collections, switching between parallel and servlet parameter servlets, lifecycle of Session object SessionFactory object SessionFactory.concrete SessionFactory.concreteFactory Set() method setter methods SettingKey, 2^nd Setup class shared resources, handling with Agent shared-state concurrency with threads should method shouldUseCostPlusCalculatorWhenPriceTypeIsCostPlus() method, 2^nd side-effecting functions Simple Build Tool. See SBT. SimpleDB, Amazon single execution core Single Responsibility Principle single() method singleton objects, 2^nd SmallestMailboxRouter Smalltalk software transactional memory. See STM. someMap someTimeConsumingOperation() method Sort option SortedSet Source class Source.fromURL, 2^nd source.getLines() method specification-based unit testing tools specifications, for behavior-driven development Specs2, behavior-driven development using Spring framework, dependency injection using SQL database Squeryl, 2^nd src/main/java folder src/main/scala folder stackable traits StackOverflowError startDatabase method startH2Task State object, 2^nd StateMonad static keyword static members, Java classes in Scala static typing, in Scala STM (software transactional memory), 2^nd handling mutable data state in stopH2Task STORIES table Story class, 2^nd, 3^rd, 4^th Stream class, and lazy collections StreamStreamServletApplication strict collections, converting to lazy collections String class, 2^nd, 3^rd, 4^th, 5^th String parameter String type, 2^nd StringBuilder() method StringSpecification.scala file structural types structural typing, dependency injection structures, data collections and Option hierarchy of lazy collections List and ListBuffer Map and Tuple mutable and immutable parallel collections Set and SortedSet using for-comprehension with foldLeft and foldRight methods for function objects higher-order functions type bounds for type parameterization for type variance for subexpressions subpackages subproblems subtype polymorphism Successor Value pattern succint code, in Scala Suereth, Joshua sum method, 2^nd Summable trait Sun Microsystems supervision strategies All-for-One One-for-One supervisors, responsibility System class

T

tail recursion, in functional programming @tailrec annotation TaskKey, defines tasks taxFree function taxingStrategy function taxIt function, 2^nd TaxStrategy trait TDD (test-driven development), 2^nd, 5^th, 6^th setting up environment using JUnit tell method template method pattern test double test-code-refactor cycle test-driven development. See TDD. TestFindByQuery.scala testing asynchronous messaging systems behavior-driven development specifications for using Specs2 dependency injection cake pattern implicit parameters in functional style structural typing using Spring framework importance of test-driven development setting up environment using JUnit using ScalaCheck example of generators for testing string behavior TestPricingSystem testShouldReturnExternalPrice() this() method, 2^nd, 3^rd threads, concurrent programming using, challenges of throwableToLeft toString method total function toXml method Trait class traits, 2^nd, 5^th and class linearization stackable transaction parameter TransactionFailure Traversable parameter trait, 2^nd try-finally block Tuple, overview tx method, 2^nd type abstraction bounds inference parameterization parameters projection variance type classes, ad hoc polymorphism with modeling orthogonal concerns using solving expression problem using TypedActor types, 7^th character floating-point higher-kinded types integer phantom types string structural types XML

U

unapply method, 2^nd, 3^rd unapplySeq method Unicode method Unit method universal traits Unix pipes SBT on UntypedActor up$extension method Updatable trait UpdatableCollection class, 2^nd uppercase characters, finding url property UrlBasedViewResolver class USContractorPayrollSystem user story UseResource class USPayroll class USPayroll method util.Random class

V

validate method, 2^nd ValidationException, 2^nd value classes rules var prefixes variables, overview Vector collection Vector() method views views.index() method

W

WAR file weather function web applications connecting to databases saving to using Squeryl creating web pages for Kanban boards creating view for defined moving cards in setting up project with SBT SBT adding dependencies build file for for Mac for Unix for Windows project structure for Scalaz HTTP module configuring with SBT overview setting up servlet using Java frameworks model, view, controller using Spring configuration web.xml file weKanban application, 4^th, 5^th setting up project user stories WeKanbanApplication, 2^nd, 3^rd, 4^th WeKanbanProjectDefinition.scala file, 2^nd WeKanbanSchema object while loop Windows, SBT on with keyword withDispatcher method withFilter WordCount implementation using actors WordCount type WordCountMaster class WordCountWorker class, 2^nd

X

XML types XmlConverter xs.clear() method, 2^nd

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