├── .gitignore ├── .idea ├── .name ├── codeStyleSettings.xml ├── compiler.xml ├── copyright │ └── profiles_settings.xml ├── inspectionProfiles │ ├── Project_Default.xml │ └── profiles_settings.xml ├── misc.xml ├── modules.xml ├── vcs.xml └── workspace.xml ├── README.md ├── build.gradle ├── quasar-kotlin-jetbrains-webinar.iml └── src └── main └── kotlin └── Main.kt /.gitignore: -------------------------------------------------------------------------------- 1 | ### Java template 2 | *.class 3 | 4 | # Mobile Tools for Java (J2ME) 5 | .mtj.tmp/ 6 | 7 | # Package Files # 8 | *.jar 9 | *.war 10 | *.ear 11 | 12 | # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml 13 | hs_err_pid* 14 | ### JetBrains template 15 | # Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio 16 | 17 | # *.iml 18 | 19 | ## Directory-based project format: 20 | # .idea/ 21 | # if you remove the above rule, at least ignore the following: 22 | 23 | # User-specific stuff: 24 | # .idea/workspace.xml 25 | .idea/tasks.xml 26 | .idea/dictionaries 27 | 28 | # Sensitive or high-churn files: 29 | .idea/dataSources.ids 30 | .idea/dataSources.xml 31 | .idea/sqlDataSources.xml 32 | .idea/dynamic.xml 33 | .idea/uiDesigner.xml 34 | 35 | # Gradle: 36 | .idea/gradle.xml 37 | .idea/libraries 38 | 39 | # Mongo Explorer plugin: 40 | .idea/mongoSettings.xml 41 | 42 | ## File-based project format: 43 | # *.ipr 44 | # *.iws 45 | 46 | ## Plugin-specific files: 47 | 48 | # IntelliJ 49 | /out/ 50 | 51 | # mpeltonen/sbt-idea plugin 52 | .idea_modules/ 53 | 54 | # JIRA plugin 55 | atlassian-ide-plugin.xml 56 | 57 | # Crashlytics plugin (for Android Studio and IntelliJ) 58 | com_crashlytics_export_strings.xml 59 | crashlytics.properties 60 | crashlytics-build.properties 61 | ### Gradle template 62 | .gradle 63 | build/ 64 | 65 | # Ignore Gradle GUI config 66 | gradle-app.setting 67 | 68 | # Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored) 69 | !gradle-wrapper.jar 70 | 71 | # Created by .ignore support plugin (hsz.mobi) 72 | -------------------------------------------------------------------------------- /.idea/.name: -------------------------------------------------------------------------------- 1 | quasar-kotlin-jetbrains-webinar -------------------------------------------------------------------------------- /.idea/codeStyleSettings.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 11 | 13 | -------------------------------------------------------------------------------- /.idea/compiler.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | -------------------------------------------------------------------------------- /.idea/copyright/profiles_settings.xml: 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1373 | 1374 | 1375 | 1376 | 1377 | 1378 | 1379 | 1380 | 1381 | 1382 | 1383 | 1384 | 1385 | 1386 | 1387 | 1392 | 1393 | 1394 | 1395 | 1396 | 1397 | No facets are configured 1398 | 1399 | 1404 | 1405 | 1406 | 1407 | 1408 | 1409 | 1410 | 1415 | 1416 | 1417 | 1418 | 1419 | 1420 | 1.7 1421 | 1422 | 1427 | 1428 | 1429 | 1430 | 1431 | 1432 | quasar-kotlin-jetbrains-webinar 1433 | 1434 | 1440 | 1441 | 1442 | 1443 | 1444 | 1445 | Gradle: co.paralleluniverse:quasar-actors:0.7.0 1446 | 1447 | 1452 | 1453 | 1454 | 1455 | 1456 | 1457 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ``` 2 | gradle 3 | ``` 4 | -------------------------------------------------------------------------------- /build.gradle: -------------------------------------------------------------------------------- 1 | buildscript { 2 | repositories { 3 | mavenCentral() 4 | } 5 | dependencies { 6 | classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.0.1-2" 7 | } 8 | } 9 | 10 | apply plugin: 'java' 11 | apply plugin: 'kotlin' 12 | apply plugin: 'application' 13 | 14 | version = '0.1.0-SNAPSHOT' 15 | status = 'integration' 16 | 17 | ext.classifier = ':jdk8' 18 | sourceCompatibility = 1.8 19 | targetCompatibility = 1.8 20 | 21 | ext.quasarVer = '0.7.5-SNAPSHOT' 22 | ext.logbackVer = '1.1.3' 23 | ext.slf4jVer = '1.7.21' 24 | 25 | ext.kotlinVer = '1.0.1-2' 26 | 27 | [compileJava, compileTestJava]*.options*.encoding = 'UTF-8' 28 | 29 | configurations { 30 | quasar 31 | } 32 | 33 | configurations.all { 34 | resolutionStrategy { 35 | failOnVersionConflict() 36 | 37 | force "org.slf4j:slf4j-api:$slf4jVer" 38 | } 39 | } 40 | 41 | repositories { 42 | // mavenLocal() 43 | mavenCentral() 44 | maven { url "https://oss.sonatype.org/content/repositories/releases" } 45 | maven { url 'https://oss.sonatype.org/content/repositories/snapshots' } 46 | // maven { url 'https://maven.java.net/content/repositories/snapshots' } 47 | } 48 | 49 | dependencies { 50 | compile "co.paralleluniverse:quasar-core:${quasarVer}${classifier}" 51 | compile "co.paralleluniverse:quasar-kotlin:${quasarVer}" 52 | 53 | compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlinVer" 54 | compile "org.jetbrains.kotlin:kotlin-reflect:$kotlinVer" 55 | 56 | quasar "co.paralleluniverse:quasar-core:${quasarVer}${classifier}@jar" 57 | 58 | runtime "ch.qos.logback:logback-classic:${logbackVer}" 59 | } 60 | 61 | mainClassName = 'MainKt' 62 | 63 | applicationDefaultJvmArgs = [ 64 | // "-Dco.paralleluniverse.fibers.verifyInstrumentation=true", 65 | "-Dco.paralleluniverse.fibers.detectRunawayFibers=false", 66 | "-javaagent:${configurations.quasar.singleFile}" // =v, =d 67 | ] 68 | 69 | run { 70 | standardInput = System.in 71 | } 72 | 73 | defaultTasks 'run' 74 | -------------------------------------------------------------------------------- /quasar-kotlin-jetbrains-webinar.iml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | -------------------------------------------------------------------------------- /src/main/kotlin/Main.kt: -------------------------------------------------------------------------------- 1 | // - Semicolons are optional in Kotlin. 2 | // - Kotlin support _import bindings_. 3 | // - "import" can be used for all sorts of inputs (package, class, object etc.). 4 | 5 | import java.util.function.* 6 | 7 | import com.google.common.collect.EvictingQueue 8 | 9 | import co.paralleluniverse.strands.* 10 | import java.util.concurrent.CompletableFuture 11 | import java.util.concurrent.ConcurrentHashMap 12 | import java.util.concurrent.ThreadLocalRandom 13 | 14 | import kotlin.concurrent.thread 15 | 16 | /** 17 | * Stock 18 | */ 19 | // - Kotlin _primary constructor_ is part of the class header and can specify `val` or `var` to 20 | // create corresponding mutable or immutable _properties_ resp.: no boilerplate assignments are 21 | // necessary. 22 | class Stock(val name: String) { 23 | 24 | // - Kotlin supports singletons directly as _literal objects_ and _companion objects_ are a special case 25 | // that can be referred through the enclosing class' identifier. 26 | // - Singleton objects are full-blown objects: they can inherit, implement and define properties and methods. 27 | companion object { 28 | 29 | // - Kotlin is strongly types but has extensive type inference, 30 | // although explicit typing for signatures is required. 31 | private val HISTORY_WINDOW_SIZE = 10 32 | 33 | // - There's no "new" keyword in Kotlin, constructors are called simply through the class name. 34 | val default = Stock("whatever") 35 | 36 | /** 37 | * Finds a stock by name. The current example implementation just constructs and caches Stock objects. 38 | */ 39 | // - Companion object methods and properties can be used as an equivalent of Java's _static_. 40 | // - Methods can be defined by an expression, in this case the return type is optional. 41 | // - Method parameters can also have default values. 42 | private fun find(name: String = "goog") = 43 | // - Kotlin supports higher-order functions. 44 | // - If the last parameter is a function, a DSL-like block-based syntax can be used. 45 | // - A _lambda_, or _function literal_, has the form `{ (param1[:Type1], ...) -> BODY }` and 46 | // if there is only a single parameter the `{ BODY }` form can be used and the parameter 47 | // can be referred to as `it`. 48 | cache.getOrPut(name) { 49 | Stock(name) 50 | } 51 | private val cache = ConcurrentHashMap() 52 | 53 | // - We'll simulate a slow system with threads that will wait up to 3 seconds to answer our inquiry 54 | private val MAX_WAIT_MILLIS: Long = 3000 55 | private fun slowAsyncVal(s: I, f: (I) -> O): CompletableFuture { 56 | val ret = CompletableFuture() 57 | thread { 58 | Strand.sleep(ThreadLocalRandom.current().nextLong(0, MAX_WAIT_MILLIS)) 59 | ret.complete(f(s)) 60 | } 61 | return ret 62 | } 63 | fun findAsync(s: String) = slowAsyncVal(s) { Stock.find(it) ?: Stock.default } 64 | fun avgAsync(s: Stock) = slowAsyncVal(s) { 65 | it.avg() 66 | } 67 | fun currentAsync(s: Stock) = slowAsyncVal(s) { it.current() } 68 | fun adviceAsync(s: Stock) = slowAsyncVal(s) { it.advice() } 69 | } 70 | 71 | /** 72 | * Sliding window for historical data 73 | */ 74 | private val hist = EvictingQueue.create(HISTORY_WINDOW_SIZE) 75 | 76 | // - Kotlin classes can have _initialization blocks_. 77 | init { 78 | // - Kotlin supports _dynamic ranges_. 79 | for(i in 0..HISTORY_WINDOW_SIZE) 80 | hist.offer(Value(newVal().num)) 81 | } 82 | 83 | /** 84 | * Generates a new stock value 85 | */ 86 | // - Kotlin has _`public`_, _`private`_, _`protected`_ and _`internal`_ (default) visibility. 87 | private fun newVal(): Value = 88 | Value ( 89 | // - Many Kotlin constructs, like "if", can be used both as statements and as expressions. 90 | if (hist.isEmpty()) 91 | ThreadLocalRandom.current().nextDouble() 92 | else { 93 | // - Locals can be mutable or immutable too. 94 | val DEVIATION = 0.25 95 | val last = hist.last().num 96 | last + (last * ThreadLocalRandom.current().nextDouble(-DEVIATION, +DEVIATION)) 97 | } 98 | ) 99 | 100 | /** 101 | * Calculates the current stock value 102 | */ 103 | private fun current(): Value { 104 | hist.offer(newVal()) 105 | 106 | // - `return` is mandatory if the method is defined as a block 107 | return hist.last() 108 | } 109 | 110 | /** 111 | * Calculates the current stock advice 112 | */ 113 | private fun advice(): Advice = 114 | Advice.values()[ThreadLocalRandom.current().nextInt(0, Advice.values().size)] 115 | 116 | /** 117 | * Returns the historical average 118 | */ 119 | fun avg() = 120 | // - What _is_ the average? It is the division by its size of 121 | // (the sum of 122 | // (the map 123 | // of the historical data 124 | // on its numerical value 125 | // ) 126 | // ) 127 | hist.map { it.num }.sum() / hist.size 128 | } 129 | 130 | /** 131 | * Stock value 132 | */ 133 | // - For _data classes_ Kotlin will generate "toString", "equals", "hashCode" and a nice "copy" method with 134 | // optional parameters to replace some of the properties during the copy. 135 | data class Value(val num: Double) 136 | 137 | /** 138 | * Stock Advice 139 | */ 140 | // - Kotlin _enum literals_ are _literal object instances_ of the _enum class_. 141 | enum class Advice { 142 | BUY, SELL, KEEP 143 | } 144 | 145 | // - _Functional monadic async_: let's _define_ a representation of our program as a "special" equation 146 | // both marked as performing async actions and compositions and allowed to used it. 147 | // - Monadic programs are essentially _async_ and _lazy_ and usually implemented in libraries so 148 | // they are extremely difficult to debug with regular tools. 149 | 150 | // - Monads creep into signatures because they are meant to "mark" programs, they are _infectious_. 151 | fun main(args: Array) { 152 | 153 | print("Insert the stock name: ") 154 | 155 | val sName = readLine() ?: "goog" 156 | 157 | println("Defining and submitting the monadic async program...") 158 | 159 | // - Let's use Java 8's `CompletableFuture` to model our monadic async program. 160 | Stock.findAsync(sName) 161 | // - Monadic `flatMap` or `bind` 162 | .thenComposeAsync(Function { 163 | // - We'll create 3 "concurrent" async monads now. 164 | val calcAvg = Stock.avgAsync(it) 165 | val calcNext = Stock.currentAsync(it) 166 | val calcAdvice = Stock.adviceAsync(it) 167 | // - We'll compose them with `allOf` and then use `thenApply` or monadic `map` to print the results. 168 | CompletableFuture.allOf(calcAvg, calcNext, calcAdvice).thenApply { 169 | println("The historical average is: ${calcAvg.join()}") 170 | println("The current value is: ${calcNext.join()}") 171 | println("The current advice is: ${calcAdvice.join()}") 172 | } 173 | }) 174 | 175 | // 3) No need for run, will start immediately. But let's say we have submitted. 176 | println("...Submitted!") 177 | } 178 | --------------------------------------------------------------------------------