├── .gitignore ├── README.md ├── build.gradle ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── src ├── main └── kotlin │ └── io │ └── reactivex │ └── rxkotlin │ ├── observable │ ├── Observable.kt │ ├── ObservableFactory.kt │ └── ObservableOperator.kt │ └── subscriber │ └── Subscriber.kt └── test └── kotlin └── ObservableTest.kt /.gitignore: -------------------------------------------------------------------------------- 1 | # Created by .ignore support plugin (hsz.mobi) 2 | /build/ 3 | /.idea/ 4 | /.gradle/ 5 | /rxkotlin-poc.iml 6 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # RxKotlin POC 2 | 3 | **NOTE: This project is at the moment abandoned** 4 | 5 | This is an attempt to implement Rx in pure Kotlin using Kotlin coroutines to handle concurrency and backpressure. There are only a handful of operators at the moment, and a couple loose ends need to be worked out like disposal. 6 | 7 | But so far, it is clear there is an opportunity to create an Rx implementation in Kotlin with less effort than Java. 8 | 9 | ## Jake Wharton's POC 10 | 11 | Be sure to check out Jake Wharton's Reagent POC, which is seeking to be multiplatform and a more thought-out type hierarchy. 12 | 13 | https://github.com/JakeWharton/Reagent/ 14 | 15 | ## Recommended reading to help contribute 16 | 17 | [Coroutines Guide](https://github.com/Kotlin/kotlinx.coroutines/blob/master/coroutines-guide.md) 18 | 19 | [Coroutines and Reactive Streams](https://github.com/Kotlin/kotlinx.coroutines/blob/master/reactive/coroutines-guide-reactive.md) 20 | 21 | ## Examples 22 | 23 | ```kotlin 24 | @Test 25 | fun testJust() { 26 | Observable.just("Alpha", "Beta", "Gamma", "Delta") 27 | .map { it.length } 28 | .filter { it >= 5 } 29 | .subscribe { println(it) } 30 | } 31 | 32 | @Test 33 | fun testSubscribeOn() = runBlocking { 34 | Observable.just("Alpha", "Beta", "Gamma", "Delta") 35 | .subscribeOn(CommonPool) 36 | .subscribe { 37 | println("$it ${Thread.currentThread().name}") 38 | } 39 | } 40 | 41 | @Test 42 | fun testObserveOn() = runBlocking { 43 | Observable.just("Alpha", "Beta", "Gamma", "Delta") 44 | .subscribeOn(CommonPool) 45 | .doOnNext { println("$it ${Thread.currentThread().name}") } 46 | .map { it.length } 47 | .observeOn(CommonPool) 48 | .subscribe { 49 | println("$it ${Thread.currentThread().name}") 50 | } 51 | } 52 | 53 | @Test 54 | fun testObservableDefer() { 55 | val state = AtomicBoolean(true) 56 | 57 | val source = Observable.defer { Observable.just(state.getAndSet(false)) } 58 | 59 | source.subscribe { println("Sub 1: $it")} 60 | source.subscribe { println("Sub 2: $it")} 61 | } 62 | 63 | @Test 64 | fun testRangeAndTake() { 65 | Observable.range(1,10) 66 | .take(5) 67 | .subscribe(onNext=::println) 68 | } 69 | 70 | @Test 71 | fun testInterval() = runBlocking { 72 | 73 | Observable.interval(1, TimeUnit.SECONDS) 74 | .subscribe(onNext=::println) 75 | 76 | delay(5000) 77 | } 78 | ``` 79 | 80 | -------------------------------------------------------------------------------- /build.gradle: -------------------------------------------------------------------------------- 1 | 2 | apply plugin: 'kotlin' 3 | 4 | repositories { 5 | jcenter() 6 | } 7 | 8 | dependencies { 9 | compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" 10 | compile 'org.reactivestreams:reactive-streams:1.0.0.final' 11 | compile 'org.jetbrains.kotlinx:kotlinx-coroutines-core:0.14' 12 | compile 'org.jetbrains.kotlinx:kotlinx-coroutines-reactive:0.14' 13 | 14 | testCompile 'junit:junit:4.12' 15 | 16 | } 17 | buildscript { 18 | ext.kotlin_version = '1.1.0' 19 | repositories { 20 | mavenCentral() 21 | } 22 | dependencies { 23 | classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" 24 | } 25 | } 26 | kotlin { 27 | experimental { 28 | coroutines "enable" 29 | } 30 | } 31 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/thomasnield/rxkotlin-poc/123690b6142bcf6e60115cfc019b82e2b2f6603e/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Sun May 28 21:36:22 CDT 2017 2 | distributionBase=GRADLE_USER_HOME 3 | distributionPath=wrapper/dists 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | distributionUrl=https\://services.gradle.org/distributions/gradle-3.4.1-bin.zip 7 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env sh 2 | 3 | ############################################################################## 4 | ## 5 | ## Gradle start up script for UN*X 6 | ## 7 | ############################################################################## 8 | 9 | # Attempt to set APP_HOME 10 | # Resolve links: $0 may be a link 11 | PRG="$0" 12 | # Need this for relative symlinks. 13 | while [ -h "$PRG" ] ; do 14 | ls=`ls -ld "$PRG"` 15 | link=`expr "$ls" : '.*-> \(.*\)$'` 16 | if expr "$link" : '/.*' > /dev/null; then 17 | PRG="$link" 18 | else 19 | PRG=`dirname "$PRG"`"/$link" 20 | fi 21 | done 22 | SAVED="`pwd`" 23 | cd "`dirname \"$PRG\"`/" >/dev/null 24 | APP_HOME="`pwd -P`" 25 | cd "$SAVED" >/dev/null 26 | 27 | APP_NAME="Gradle" 28 | APP_BASE_NAME=`basename "$0"` 29 | 30 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 31 | DEFAULT_JVM_OPTS="" 32 | 33 | # Use the maximum available, or set MAX_FD != -1 to use that value. 34 | MAX_FD="maximum" 35 | 36 | warn ( ) { 37 | echo "$*" 38 | } 39 | 40 | die ( ) { 41 | echo 42 | echo "$*" 43 | echo 44 | exit 1 45 | } 46 | 47 | # OS specific support (must be 'true' or 'false'). 48 | cygwin=false 49 | msys=false 50 | darwin=false 51 | nonstop=false 52 | case "`uname`" in 53 | CYGWIN* ) 54 | cygwin=true 55 | ;; 56 | Darwin* ) 57 | darwin=true 58 | ;; 59 | MINGW* ) 60 | msys=true 61 | ;; 62 | NONSTOP* ) 63 | nonstop=true 64 | ;; 65 | esac 66 | 67 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 68 | 69 | # Determine the Java command to use to start the JVM. 70 | if [ -n "$JAVA_HOME" ] ; then 71 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 72 | # IBM's JDK on AIX uses strange locations for the executables 73 | JAVACMD="$JAVA_HOME/jre/sh/java" 74 | else 75 | JAVACMD="$JAVA_HOME/bin/java" 76 | fi 77 | if [ ! -x "$JAVACMD" ] ; then 78 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 79 | 80 | Please set the JAVA_HOME variable in your environment to match the 81 | location of your Java installation." 82 | fi 83 | else 84 | JAVACMD="java" 85 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 86 | 87 | Please set the JAVA_HOME variable in your environment to match the 88 | location of your Java installation." 89 | fi 90 | 91 | # Increase the maximum file descriptors if we can. 92 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then 93 | MAX_FD_LIMIT=`ulimit -H -n` 94 | if [ $? -eq 0 ] ; then 95 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 96 | MAX_FD="$MAX_FD_LIMIT" 97 | fi 98 | ulimit -n $MAX_FD 99 | if [ $? -ne 0 ] ; then 100 | warn "Could not set maximum file descriptor limit: $MAX_FD" 101 | fi 102 | else 103 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 104 | fi 105 | fi 106 | 107 | # For Darwin, add options to specify how the application appears in the dock 108 | if $darwin; then 109 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 110 | fi 111 | 112 | # For Cygwin, switch paths to Windows format before running java 113 | if $cygwin ; then 114 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 115 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 116 | JAVACMD=`cygpath --unix "$JAVACMD"` 117 | 118 | # We build the pattern for arguments to be converted via cygpath 119 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 120 | SEP="" 121 | for dir in $ROOTDIRSRAW ; do 122 | ROOTDIRS="$ROOTDIRS$SEP$dir" 123 | SEP="|" 124 | done 125 | OURCYGPATTERN="(^($ROOTDIRS))" 126 | # Add a user-defined pattern to the cygpath arguments 127 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 128 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 129 | fi 130 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 131 | i=0 132 | for arg in "$@" ; do 133 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 134 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 135 | 136 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 137 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 138 | else 139 | eval `echo args$i`="\"$arg\"" 140 | fi 141 | i=$((i+1)) 142 | done 143 | case $i in 144 | (0) set -- ;; 145 | (1) set -- "$args0" ;; 146 | (2) set -- "$args0" "$args1" ;; 147 | (3) set -- "$args0" "$args1" "$args2" ;; 148 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;; 149 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 150 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 151 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 152 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 153 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 154 | esac 155 | fi 156 | 157 | # Escape application args 158 | save ( ) { 159 | for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done 160 | echo " " 161 | } 162 | APP_ARGS=$(save "$@") 163 | 164 | # Collect all arguments for the java command, following the shell quoting and substitution rules 165 | eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS" 166 | 167 | # by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong 168 | if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then 169 | cd "$(dirname "$0")" 170 | fi 171 | 172 | exec "$JAVACMD" "$@" 173 | -------------------------------------------------------------------------------- /gradlew.bat: -------------------------------------------------------------------------------- 1 | @if "%DEBUG%" == "" @echo off 2 | @rem ########################################################################## 3 | @rem 4 | @rem Gradle startup script for Windows 5 | @rem 6 | @rem ########################################################################## 7 | 8 | @rem Set local scope for the variables with windows NT shell 9 | if "%OS%"=="Windows_NT" setlocal 10 | 11 | set DIRNAME=%~dp0 12 | if "%DIRNAME%" == "" set DIRNAME=. 13 | set APP_BASE_NAME=%~n0 14 | set APP_HOME=%DIRNAME% 15 | 16 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 17 | set DEFAULT_JVM_OPTS= 18 | 19 | @rem Find java.exe 20 | if defined JAVA_HOME goto findJavaFromJavaHome 21 | 22 | set JAVA_EXE=java.exe 23 | %JAVA_EXE% -version >NUL 2>&1 24 | if "%ERRORLEVEL%" == "0" goto init 25 | 26 | echo. 27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 28 | echo. 29 | echo Please set the JAVA_HOME variable in your environment to match the 30 | echo location of your Java installation. 31 | 32 | goto fail 33 | 34 | :findJavaFromJavaHome 35 | set JAVA_HOME=%JAVA_HOME:"=% 36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 37 | 38 | if exist "%JAVA_EXE%" goto init 39 | 40 | echo. 41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 42 | echo. 43 | echo Please set the JAVA_HOME variable in your environment to match the 44 | echo location of your Java installation. 45 | 46 | goto fail 47 | 48 | :init 49 | @rem Get command-line arguments, handling Windows variants 50 | 51 | if not "%OS%" == "Windows_NT" goto win9xME_args 52 | 53 | :win9xME_args 54 | @rem Slurp the command line arguments. 55 | set CMD_LINE_ARGS= 56 | set _SKIP=2 57 | 58 | :win9xME_args_slurp 59 | if "x%~1" == "x" goto execute 60 | 61 | set CMD_LINE_ARGS=%* 62 | 63 | :execute 64 | @rem Setup the command line 65 | 66 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 67 | 68 | @rem Execute Gradle 69 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% 70 | 71 | :end 72 | @rem End local scope for the variables with windows NT shell 73 | if "%ERRORLEVEL%"=="0" goto mainEnd 74 | 75 | :fail 76 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 77 | rem the _cmd.exe /c_ return code! 78 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 79 | exit /b 1 80 | 81 | :mainEnd 82 | if "%OS%"=="Windows_NT" endlocal 83 | 84 | :omega 85 | -------------------------------------------------------------------------------- /src/main/kotlin/io/reactivex/rxkotlin/observable/Observable.kt: -------------------------------------------------------------------------------- 1 | package io.reactivex.rxkotlin.observable 2 | 3 | import org.reactivestreams.Publisher 4 | import org.reactivestreams.Subscriber 5 | 6 | interface Observable: Publisher { 7 | override fun subscribe(subscriber: Subscriber) 8 | companion object Factory 9 | } 10 | 11 | -------------------------------------------------------------------------------- /src/main/kotlin/io/reactivex/rxkotlin/observable/ObservableFactory.kt: -------------------------------------------------------------------------------- 1 | package io.reactivex.rxkotlin.observable 2 | 3 | import kotlinx.coroutines.experimental.CommonPool 4 | import kotlinx.coroutines.experimental.delay 5 | import kotlinx.coroutines.experimental.launch 6 | import org.reactivestreams.Subscriber 7 | import java.util.concurrent.TimeUnit 8 | import kotlin.coroutines.experimental.CoroutineContext 9 | 10 | fun Observable.Factory.just(vararg items: T) = object: Observable { 11 | override fun subscribe(subscriber: Subscriber) { 12 | try { 13 | items.forEach(subscriber::onNext) 14 | subscriber.onComplete() 15 | } catch (e: Exception) { 16 | subscriber.onError(e) 17 | } 18 | } 19 | } 20 | 21 | fun Observable.Factory.fromIterable(items: Iterable) = object: Observable { 22 | override fun subscribe(subscriber: Subscriber) { 23 | try { 24 | items.forEach(subscriber::onNext) 25 | subscriber.onComplete() 26 | } catch (e: Exception) { 27 | subscriber.onError(e) 28 | } 29 | } 30 | } 31 | 32 | inline fun Observable.Factory.defer(crossinline observable: () -> Observable) = object: Observable { 33 | override fun subscribe(subscriber: Subscriber) { 34 | val newObservable = observable() 35 | newObservable.subscribe(subscriber) 36 | } 37 | } 38 | 39 | 40 | fun Observable.Factory.range(rangeStart: Int, rangeEnd: Int) = object: Observable { 41 | override fun subscribe(subscriber: Subscriber) { 42 | try { 43 | (rangeStart..rangeEnd) 44 | .forEach(subscriber::onNext) 45 | subscriber.onComplete() 46 | } catch (e: Exception) { 47 | subscriber.onError(e) 48 | } 49 | } 50 | } 51 | 52 | fun Observable.Factory.interval(time: Long, timeUnit: TimeUnit, context: CoroutineContext = CommonPool) = object: Observable { 53 | override fun subscribe(subscriber: Subscriber) { 54 | try { 55 | launch(context) { 56 | repeat(Int.MAX_VALUE) { 57 | delay(time, timeUnit) 58 | subscriber.onNext(it) 59 | } 60 | } 61 | } catch (e: Exception) { 62 | subscriber.onError(e) 63 | } 64 | } 65 | } 66 | 67 | -------------------------------------------------------------------------------- /src/main/kotlin/io/reactivex/rxkotlin/observable/ObservableOperator.kt: -------------------------------------------------------------------------------- 1 | package io.reactivex.rxkotlin.observable 2 | 3 | import kotlinx.coroutines.experimental.Job 4 | import kotlinx.coroutines.experimental.launch 5 | import org.reactivestreams.Subscriber 6 | import org.reactivestreams.Subscription 7 | import kotlin.coroutines.experimental.CoroutineContext 8 | 9 | inline fun Observable.map(crossinline mapper: (T) -> R): Observable = object: Observable { 10 | 11 | private val upstream: Observable = this@map 12 | 13 | override fun subscribe(subscriber: Subscriber) { 14 | upstream.subscribe(object: Subscriber { 15 | override fun onComplete() = subscriber.onComplete() 16 | 17 | override fun onNext(t: T) = try { 18 | subscriber.onNext(mapper(t)) 19 | } catch (e: Throwable) { 20 | onError(e) 21 | } 22 | 23 | override fun onError(t: Throwable) = subscriber.onError(t) 24 | 25 | override fun onSubscribe(s: Subscription) = subscriber.onSubscribe(s) 26 | }) 27 | } 28 | } 29 | 30 | inline fun Observable.filter(crossinline predicate: (T) -> Boolean): Observable = object: Observable { 31 | 32 | private val upstream: Observable = this@filter 33 | 34 | override fun subscribe(subscriber: Subscriber) { 35 | upstream.subscribe(object: Subscriber { 36 | override fun onComplete() = subscriber.onComplete() 37 | 38 | override fun onNext(t: T) = try { 39 | if (predicate(t)) subscriber.onNext(t) else Unit 40 | } catch (e: Throwable) { 41 | onError(e) 42 | } 43 | 44 | override fun onError(t: Throwable) = subscriber.onError(t) 45 | 46 | override fun onSubscribe(s: Subscription) = subscriber.onSubscribe(s) 47 | }) 48 | } 49 | } 50 | 51 | fun Observable.subscribeOn(context: CoroutineContext): Observable = object: Observable { 52 | 53 | private val upstream: Observable = this@subscribeOn 54 | 55 | override fun subscribe(subscriber: Subscriber) { 56 | var job: Job? = null 57 | job = launch(context) { 58 | 59 | upstream.subscribe(object : Subscriber { 60 | override fun onComplete() = subscriber.onComplete() 61 | 62 | override fun onNext(t: T) = try { 63 | subscriber.onNext(t) 64 | } catch (e: Throwable) { 65 | onError(e) 66 | } 67 | 68 | override fun onError(t: Throwable) = subscriber.onError(t) 69 | 70 | override fun onSubscribe(s: Subscription) { 71 | 72 | val upstreamAndDownstreamSubscription = object: Subscription { 73 | override fun cancel() { 74 | s.cancel() 75 | job?.cancel() 76 | } 77 | 78 | override fun request(n: Long) { 79 | s.request(n) } 80 | 81 | } 82 | subscriber.onSubscribe(upstreamAndDownstreamSubscription) 83 | } 84 | }) 85 | } 86 | } 87 | } 88 | 89 | fun Observable.observeOn(context: CoroutineContext): Observable = object: Observable { 90 | 91 | private val upstream: Observable = this@observeOn 92 | 93 | override fun subscribe(subscriber: Subscriber) { 94 | 95 | upstream.subscribe(object : Subscriber { 96 | var job: Job? = null 97 | override fun onComplete() { 98 | job = launch(context) { 99 | subscriber.onComplete() 100 | } 101 | } 102 | 103 | override fun onNext(t: T) { 104 | try { 105 | job = launch(context) { 106 | subscriber.onNext(t) 107 | } 108 | } catch (e: Throwable) { 109 | onError(e) 110 | } 111 | } 112 | 113 | override fun onError(t: Throwable) { 114 | launch(context) { 115 | subscriber.onError(t) 116 | } 117 | } 118 | 119 | override fun onSubscribe(s: Subscription) { 120 | 121 | val upstreamAndDownstreamSubscription = object: Subscription { 122 | override fun cancel() { 123 | s.cancel() 124 | job?.cancel() 125 | } 126 | 127 | override fun request(n: Long) { 128 | s.request(n) } 129 | 130 | } 131 | subscriber.onSubscribe(upstreamAndDownstreamSubscription) 132 | } 133 | }) 134 | } 135 | } 136 | 137 | inline fun Observable.doOnNext(crossinline onNext: (T) -> Unit) = object: Observable { 138 | private val upstream: Observable = this@doOnNext 139 | 140 | override fun subscribe(subscriber: Subscriber) { 141 | 142 | upstream.subscribe(object : Subscriber { 143 | override fun onComplete() = subscriber.onComplete() 144 | 145 | override fun onNext(t: T) { 146 | try { 147 | onNext(t) 148 | subscriber.onNext(t) 149 | } catch (e: Throwable) { 150 | onError(e) 151 | } 152 | } 153 | 154 | override fun onError(t: Throwable) = subscriber.onError(t) 155 | 156 | override fun onSubscribe(s: Subscription) = subscriber.onSubscribe(s) 157 | }) 158 | } 159 | } 160 | 161 | 162 | fun Observable.take(takeCount: Int) = object: Observable { 163 | 164 | override fun subscribe(subscriber: Subscriber) { 165 | 166 | this@take.subscribe(object : Subscriber { 167 | 168 | var count = 0 169 | 170 | override fun onComplete() = subscriber.onComplete() 171 | 172 | override fun onNext(t: T) { 173 | try { 174 | count++ 175 | if (count <= takeCount) { 176 | subscriber.onNext(t) 177 | } else { 178 | //not sure how to dispose 179 | } 180 | 181 | } catch (e: Throwable) { 182 | onError(e) 183 | } 184 | } 185 | 186 | override fun onError(t: Throwable) = subscriber.onError(t) 187 | 188 | override fun onSubscribe(s: Subscription) = subscriber.onSubscribe(s) 189 | }) 190 | } 191 | } -------------------------------------------------------------------------------- /src/main/kotlin/io/reactivex/rxkotlin/subscriber/Subscriber.kt: -------------------------------------------------------------------------------- 1 | package io.reactivex.rxkotlin.subscriber 2 | 3 | import io.reactivex.rxkotlin.observable.Observable 4 | import org.reactivestreams.Subscriber 5 | import org.reactivestreams.Subscription 6 | 7 | fun Observable.subscribe(onComplete: (() -> Unit)? = null, 8 | onError: ((Throwable) -> Unit)? = null, 9 | onNext: ((T) -> Unit)? = null) = subscribe( 10 | object: Subscriber { 11 | override fun onNext(t: T) = onNext?.invoke(t)?:Unit 12 | 13 | override fun onComplete() = onComplete?.invoke()?:Unit 14 | 15 | override fun onError(t: Throwable) = onError?.invoke(t)?:Unit 16 | 17 | override fun onSubscribe(s: Subscription?) { 18 | } 19 | } 20 | ) -------------------------------------------------------------------------------- /src/test/kotlin/ObservableTest.kt: -------------------------------------------------------------------------------- 1 | import io.reactivex.rxkotlin.observable.* 2 | import io.reactivex.rxkotlin.subscriber.subscribe 3 | import kotlinx.coroutines.experimental.CommonPool 4 | import kotlinx.coroutines.experimental.delay 5 | import kotlinx.coroutines.experimental.runBlocking 6 | import org.junit.Test 7 | import java.util.concurrent.TimeUnit 8 | import java.util.concurrent.atomic.AtomicBoolean 9 | 10 | class ObservableTest { 11 | @Test 12 | fun testJust() { 13 | Observable.just("Alpha", "Beta", "Gamma", "Delta").run { 14 | subscribe { println(it)} 15 | map { it.length }.subscribe { println(it) } 16 | } 17 | } 18 | 19 | @Test 20 | fun testSubscribeOn() = runBlocking { 21 | Observable.just("Alpha", "Beta", "Gamma", "Delta") 22 | .subscribeOn(CommonPool) 23 | .subscribe { 24 | println("$it ${Thread.currentThread().name}") 25 | } 26 | } 27 | 28 | @Test 29 | fun testObserveOn() = runBlocking { 30 | Observable.just("Alpha", "Beta", "Gamma", "Delta") 31 | .subscribeOn(CommonPool) 32 | .doOnNext { println("$it ${Thread.currentThread().name}") } 33 | .map { it.length } 34 | .observeOn(CommonPool) 35 | .subscribe { 36 | println("$it ${Thread.currentThread().name}") 37 | } 38 | } 39 | 40 | @Test 41 | fun testObservableDefer() { 42 | val state = AtomicBoolean(true) 43 | 44 | val source = Observable.defer { Observable.just(state.getAndSet(false)) } 45 | 46 | source.subscribe { println("Sub 1: $it")} 47 | source.subscribe { println("Sub 2: $it")} 48 | } 49 | @Test 50 | fun testRangeAndTake() { 51 | Observable.range(1,10) 52 | .take(5) 53 | .subscribe(onNext=::println) 54 | } 55 | 56 | @Test 57 | fun testInterval() = runBlocking { 58 | 59 | Observable.interval(1, TimeUnit.SECONDS) 60 | .subscribe(onNext=::println) 61 | 62 | delay(5000) 63 | } 64 | } --------------------------------------------------------------------------------