├── .gitignore ├── LICENSE.txt ├── README.md ├── build.gradle ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── src ├── main └── java │ └── px │ ├── Pollable.kt │ └── internal │ ├── op │ ├── Filter.kt │ ├── FlatMap.kt │ └── Map.kt │ └── source │ ├── Create.kt │ ├── Defer.kt │ ├── Empty.kt │ ├── FromArray.kt │ ├── JustError.kt │ ├── JustItem.kt │ └── Never.kt └── test └── java └── px ├── PollableOperatorTest.kt └── PollableSourceTest.kt /.gitignore: -------------------------------------------------------------------------------- 1 | .gradle 2 | /local.properties 3 | /.idea 4 | *.iml 5 | .DS_Store 6 | /build 7 | /app/build 8 | -------------------------------------------------------------------------------- /LICENSE.txt: -------------------------------------------------------------------------------- 1 | 2 | Apache License 3 | Version 2.0, January 2004 4 | http://www.apache.org/licenses/ 5 | 6 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 7 | 8 | 1. Definitions. 9 | 10 | "License" shall mean the terms and conditions for use, reproduction, 11 | and distribution as defined by Sections 1 through 9 of this document. 12 | 13 | "Licensor" shall mean the copyright owner or entity authorized by 14 | the copyright owner that is granting the License. 15 | 16 | "Legal Entity" shall mean the union of the acting entity and all 17 | other entities that control, are controlled by, or are under common 18 | control with that entity. For the purposes of this definition, 19 | "control" means (i) the power, direct or indirect, to cause the 20 | direction or management of such entity, whether by contract or 21 | otherwise, or (ii) ownership of fifty percent (50%) or more of the 22 | outstanding shares, or (iii) beneficial ownership of such entity. 23 | 24 | "You" (or "Your") shall mean an individual or Legal Entity 25 | exercising permissions granted by this License. 26 | 27 | "Source" form shall mean the preferred form for making modifications, 28 | including but not limited to software source code, documentation 29 | source, and configuration files. 30 | 31 | "Object" form shall mean any form resulting from mechanical 32 | transformation or translation of a Source form, including but 33 | not limited to compiled object code, generated documentation, 34 | and conversions to other media types. 35 | 36 | "Work" shall mean the work of authorship, whether in Source or 37 | Object form, made available under the License, as indicated by a 38 | copyright notice that is included in or attached to the work 39 | (an example is provided in the Appendix below). 40 | 41 | "Derivative Works" shall mean any work, whether in Source or Object 42 | form, that is based on (or derived from) the Work and for which the 43 | editorial revisions, annotations, elaborations, or other modifications 44 | represent, as a whole, an original work of authorship. For the purposes 45 | of this License, Derivative Works shall not include works that remain 46 | separable from, or merely link (or bind by name) to the interfaces of, 47 | the Work and Derivative Works thereof. 48 | 49 | "Contribution" shall mean any work of authorship, including 50 | the original version of the Work and any modifications or additions 51 | to that Work or Derivative Works thereof, that is intentionally 52 | submitted to Licensor for inclusion in the Work by the copyright owner 53 | or by an individual or Legal Entity authorized to submit on behalf of 54 | the copyright owner. For the purposes of this definition, "submitted" 55 | means any form of electronic, verbal, or written communication sent 56 | to the Licensor or its representatives, including but not limited to 57 | communication on electronic mailing lists, source code control systems, 58 | and issue tracking systems that are managed by, or on behalf of, the 59 | Licensor for the purpose of discussing and improving the Work, but 60 | excluding communication that is conspicuously marked or otherwise 61 | designated in writing by the copyright owner as "Not a Contribution." 62 | 63 | "Contributor" shall mean Licensor and any individual or Legal Entity 64 | on behalf of whom a Contribution has been received by Licensor and 65 | subsequently incorporated within the Work. 66 | 67 | 2. Grant of Copyright License. Subject to the terms and conditions of 68 | this License, each Contributor hereby grants to You a perpetual, 69 | worldwide, non-exclusive, no-charge, royalty-free, irrevocable 70 | copyright license to reproduce, prepare Derivative Works of, 71 | publicly display, publicly perform, sublicense, and distribute the 72 | Work and such Derivative Works in Source or Object form. 73 | 74 | 3. Grant of Patent License. Subject to the terms and conditions of 75 | this License, each Contributor hereby grants to You a perpetual, 76 | worldwide, non-exclusive, no-charge, royalty-free, irrevocable 77 | (except as stated in this section) patent license to make, have made, 78 | use, offer to sell, sell, import, and otherwise transfer the Work, 79 | where such license applies only to those patent claims licensable 80 | by such Contributor that are necessarily infringed by their 81 | Contribution(s) alone or by combination of their Contribution(s) 82 | with the Work to which such Contribution(s) was submitted. If You 83 | institute patent litigation against any entity (including a 84 | cross-claim or counterclaim in a lawsuit) alleging that the Work 85 | or a Contribution incorporated within the Work constitutes direct 86 | or contributory patent infringement, then any patent licenses 87 | granted to You under this License for that Work shall terminate 88 | as of the date such litigation is filed. 89 | 90 | 4. Redistribution. You may reproduce and distribute copies of the 91 | Work or Derivative Works thereof in any medium, with or without 92 | modifications, and in Source or Object form, provided that You 93 | meet the following conditions: 94 | 95 | (a) You must give any other recipients of the Work or 96 | Derivative Works a copy of this License; and 97 | 98 | (b) You must cause any modified files to carry prominent notices 99 | stating that You changed the files; and 100 | 101 | (c) You must retain, in the Source form of any Derivative Works 102 | that You distribute, all copyright, patent, trademark, and 103 | attribution notices from the Source form of the Work, 104 | excluding those notices that do not pertain to any part of 105 | the Derivative Works; and 106 | 107 | (d) If the Work includes a "NOTICE" text file as part of its 108 | distribution, then any Derivative Works that You distribute must 109 | include a readable copy of the attribution notices contained 110 | within such NOTICE file, excluding those notices that do not 111 | pertain to any part of the Derivative Works, in at least one 112 | of the following places: within a NOTICE text file distributed 113 | as part of the Derivative Works; within the Source form or 114 | documentation, if provided along with the Derivative Works; or, 115 | within a display generated by the Derivative Works, if and 116 | wherever such third-party notices normally appear. The contents 117 | of the NOTICE file are for informational purposes only and 118 | do not modify the License. You may add Your own attribution 119 | notices within Derivative Works that You distribute, alongside 120 | or as an addendum to the NOTICE text from the Work, provided 121 | that such additional attribution notices cannot be construed 122 | as modifying the License. 123 | 124 | You may add Your own copyright statement to Your modifications and 125 | may provide additional or different license terms and conditions 126 | for use, reproduction, or distribution of Your modifications, or 127 | for any such Derivative Works as a whole, provided Your use, 128 | reproduction, and distribution of the Work otherwise complies with 129 | the conditions stated in this License. 130 | 131 | 5. Submission of Contributions. Unless You explicitly state otherwise, 132 | any Contribution intentionally submitted for inclusion in the Work 133 | by You to the Licensor shall be under the terms and conditions of 134 | this License, without any additional terms or conditions. 135 | Notwithstanding the above, nothing herein shall supersede or modify 136 | the terms of any separate license agreement you may have executed 137 | with Licensor regarding such Contributions. 138 | 139 | 6. Trademarks. This License does not grant permission to use the trade 140 | names, trademarks, service marks, or product names of the Licensor, 141 | except as required for reasonable and customary use in describing the 142 | origin of the Work and reproducing the content of the NOTICE file. 143 | 144 | 7. Disclaimer of Warranty. Unless required by applicable law or 145 | agreed to in writing, Licensor provides the Work (and each 146 | Contributor provides its Contributions) on an "AS IS" BASIS, 147 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 148 | implied, including, without limitation, any warranties or conditions 149 | of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A 150 | PARTICULAR PURPOSE. You are solely responsible for determining the 151 | appropriateness of using or redistributing the Work and assume any 152 | risks associated with Your exercise of permissions under this License. 153 | 154 | 8. Limitation of Liability. In no event and under no legal theory, 155 | whether in tort (including negligence), contract, or otherwise, 156 | unless required by applicable law (such as deliberate and grossly 157 | negligent acts) or agreed to in writing, shall any Contributor be 158 | liable to You for damages, including any direct, indirect, special, 159 | incidental, or consequential damages of any character arising as a 160 | result of this License or out of the use or inability to use the 161 | Work (including but not limited to damages for loss of goodwill, 162 | work stoppage, computer failure or malfunction, or any and all 163 | other commercial damages or losses), even if such Contributor 164 | has been advised of the possibility of such damages. 165 | 166 | 9. Accepting Warranty or Additional Liability. While redistributing 167 | the Work or Derivative Works thereof, You may choose to offer, 168 | and charge a fee for, acceptance of support, warranty, indemnity, 169 | or other liability obligations and/or rights consistent with this 170 | License. However, in accepting such obligations, You may act only 171 | on Your own behalf and on Your sole responsibility, not on behalf 172 | of any other Contributor, and only if You agree to indemnify, 173 | defend, and hold each Contributor harmless for any liability 174 | incurred by, or claims asserted against, such Contributor by reason 175 | of your accepting any such warranty or additional liability. 176 | 177 | END OF TERMS AND CONDITIONS 178 | 179 | APPENDIX: How to apply the Apache License to your work. 180 | 181 | To apply the Apache License to your work, attach the following 182 | boilerplate notice, with the fields enclosed by brackets "[]" 183 | replaced with your own identifying information. (Don't include 184 | the brackets!) The text should be enclosed in the appropriate 185 | comment syntax for the file format. We also recommend that a 186 | file or class name and description of purpose be included on the 187 | same "printed page" as the copyright notice for easier 188 | identification within third-party archives. 189 | 190 | Copyright [yyyy] [name of copyright owner] 191 | 192 | Licensed under the Apache License, Version 2.0 (the "License"); 193 | you may not use this file except in compliance with the License. 194 | You may obtain a copy of the License at 195 | 196 | http://www.apache.org/licenses/LICENSE-2.0 197 | 198 | Unless required by applicable law or agreed to in writing, software 199 | distributed under the License is distributed on an "AS IS" BASIS, 200 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 201 | See the License for the specific language governing permissions and 202 | limitations under the License. 203 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | PxJava 2 | ====== 3 | 4 | An experiment which interprets RxJava as an entirely pull-based system written in Kotlin. 5 | Inspired by ["Designing futures for Rust"](http://aturon.github.io/blog/2016/09/07/futures-design/). 6 | 7 | 8 | 9 | FAQ 10 | --- 11 | 12 | ### Should I use this? 13 | 14 | No. 15 | 16 | 17 | 18 | License 19 | ------- 20 | 21 | Copyright 2016 Jake Wharton 22 | 23 | Licensed under the Apache License, Version 2.0 (the "License"); 24 | you may not use this file except in compliance with the License. 25 | You may obtain a copy of the License at 26 | 27 | http://www.apache.org/licenses/LICENSE-2.0 28 | 29 | Unless required by applicable law or agreed to in writing, software 30 | distributed under the License is distributed on an "AS IS" BASIS, 31 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 32 | See the License for the specific language governing permissions and 33 | limitations under the License. 34 | -------------------------------------------------------------------------------- /build.gradle: -------------------------------------------------------------------------------- 1 | buildscript { 2 | ext.kotlin_version = '1.0.5' 3 | 4 | repositories { 5 | mavenCentral() 6 | } 7 | dependencies { 8 | classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" 9 | } 10 | } 11 | 12 | apply plugin: 'kotlin' 13 | 14 | sourceCompatibility = 1.6 15 | targetCompatibility = 1.6 16 | 17 | repositories { 18 | mavenCentral() 19 | } 20 | 21 | dependencies { 22 | compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" 23 | testCompile 'junit:junit:4.12' 24 | } 25 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/JakeWharton/PxJava/c20a8b659af0ce0f2de42d523822797724f25ccb/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Tue Nov 08 13:45:07 EST 2016 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-3.1-all.zip 7 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 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 | # Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules 158 | function splitJvmOpts() { 159 | JVM_OPTS=("$@") 160 | } 161 | eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS 162 | JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME" 163 | 164 | # by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong 165 | if [[ "$(uname)" == "Darwin" ]] && [[ "$HOME" == "$PWD" ]]; then 166 | cd "$(dirname "$0")" 167 | fi 168 | 169 | exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@" 170 | -------------------------------------------------------------------------------- /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/java/px/Pollable.kt: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jake Wharton 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | package px 17 | 18 | import px.internal.op.Filter 19 | import px.internal.op.FlatMap 20 | import px.internal.op.Map 21 | import px.internal.source.Create 22 | import px.internal.source.Defer 23 | import px.internal.source.Empty 24 | import px.internal.source.FromArray 25 | import px.internal.source.JustError 26 | import px.internal.source.JustItem 27 | import px.internal.source.Never 28 | import java.io.Closeable 29 | 30 | abstract class Pollable { 31 | interface Machine : Closeable { 32 | fun poll(): T? 33 | fun isComplete(): Boolean 34 | } 35 | 36 | abstract fun start(): Machine 37 | 38 | fun map(func: (T) -> O) : Pollable = Map(this, func) 39 | fun filter(func: (T) -> Boolean) : Pollable = Filter(this, func) 40 | fun flatMap(func: (T) -> Pollable): Pollable = FlatMap(this, func) 41 | 42 | companion object { 43 | @JvmStatic 44 | fun just(item: T) : Pollable = JustItem(item) 45 | @JvmStatic 46 | fun defer(func: () -> Pollable) = Defer(func) 47 | @JvmStatic 48 | fun from(vararg items: T) : Pollable = FromArray(items) 49 | @JvmStatic 50 | fun create(func: (Emitter) -> Unit) : Pollable = Create(func) 51 | @JvmStatic 52 | fun error(t: Throwable) : Pollable = JustError(t) 53 | @JvmStatic 54 | @Suppress("UNCHECKED_CAST") 55 | fun empty() : Pollable = Empty as Pollable 56 | @JvmStatic 57 | @Suppress("UNCHECKED_CAST") 58 | fun never() : Pollable = Never as Pollable 59 | } 60 | 61 | interface Emitter { 62 | fun complete() 63 | fun item(item: T) 64 | fun error(t: Throwable) 65 | fun setCloser(action: () -> Unit) 66 | } 67 | } 68 | -------------------------------------------------------------------------------- /src/main/java/px/internal/op/Filter.kt: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jake Wharton 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | package px.internal.op 17 | 18 | import px.Pollable 19 | 20 | class Filter(val upstream: Pollable, val func: (T) -> Boolean) : Pollable() { 21 | override fun start() = Operator(upstream.start(), func) 22 | 23 | class Operator(val upstream: Machine, val func: (T) -> Boolean) : Machine by upstream { 24 | override fun poll(): T? = upstream.poll()?.let { return if (func.invoke(it)) it else null } 25 | } 26 | } 27 | -------------------------------------------------------------------------------- /src/main/java/px/internal/op/FlatMap.kt: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jake Wharton 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | package px.internal.op 17 | 18 | import px.Pollable 19 | import java.util.ArrayDeque 20 | 21 | class FlatMap(val upstream: Pollable, val func: (U) -> Pollable) : Pollable() { 22 | override fun start() = Operator(upstream.start(), func) 23 | 24 | class Operator(val upstream: Machine, val func: (U) -> Pollable) : Machine { 25 | val children = ArrayDeque>() 26 | 27 | override fun poll(): D? { 28 | while (true) { 29 | upstream.poll()?.let { 30 | children += func.invoke(it).start() 31 | } ?: break 32 | } 33 | 34 | val iterator = children.iterator() 35 | while (iterator.hasNext()) { 36 | iterator.next().let { child -> 37 | if (child.isComplete()) { 38 | iterator.remove() 39 | } else { 40 | child.poll()?.let { 41 | if (child.isComplete()) { 42 | iterator.remove() 43 | } 44 | return it 45 | } 46 | } 47 | } 48 | } 49 | return null 50 | } 51 | 52 | override fun isComplete() = children.all { it.isComplete() } && upstream.isComplete() 53 | 54 | override fun close() { 55 | upstream.close() 56 | children.forEach { it.close() } 57 | } 58 | } 59 | } 60 | -------------------------------------------------------------------------------- /src/main/java/px/internal/op/Map.kt: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jake Wharton 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | package px.internal.op 17 | 18 | import px.Pollable 19 | 20 | class Map(val upstream: Pollable, val func: (U) -> D) : Pollable() { 21 | override fun start() = Operator(upstream.start(), func) 22 | 23 | class Operator(val upstream: Machine, val func: (U) -> D) : Machine { 24 | override fun poll(): D? = upstream.poll()?.run(func) 25 | override fun isComplete() = upstream.isComplete() 26 | override fun close() = upstream.close() 27 | } 28 | } 29 | -------------------------------------------------------------------------------- /src/main/java/px/internal/source/Create.kt: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jake Wharton 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | package px.internal.source 17 | 18 | import px.Pollable 19 | import java.util.ArrayDeque 20 | 21 | class Create(val func: (Emitter) -> Unit) : Pollable() { 22 | override fun start(): Machine { 23 | val impl = Implementation() 24 | func.invoke(impl) 25 | return impl 26 | } 27 | 28 | class Implementation() : Machine, Emitter { 29 | object Complete 30 | class Error(val t: Throwable) 31 | 32 | var closed = false 33 | var closeAction: (() -> Unit)? = null 34 | val items = ArrayDeque() 35 | 36 | override fun poll(): T? { 37 | if (closed) throw IllegalStateException("closed") 38 | items.pollFirst()?.let { 39 | @Suppress("UNCHECKED_CAST") 40 | when (it) { 41 | is Complete -> closed = true 42 | is Error -> throw it.t 43 | else -> return it as T 44 | } 45 | } 46 | return null 47 | } 48 | 49 | override fun isComplete() = closed 50 | 51 | override fun close() { 52 | closeAction?.invoke() 53 | closed = true 54 | } 55 | 56 | override fun item(item: T) { 57 | items += item 58 | } 59 | 60 | override fun complete() { 61 | items += Complete 62 | } 63 | 64 | override fun error(t: Throwable) { 65 | items += Error(t) 66 | } 67 | 68 | override fun setCloser(action: () -> Unit) { 69 | if (closeAction != null) throw IllegalStateException("Close action already set") 70 | closeAction = action 71 | } 72 | } 73 | } -------------------------------------------------------------------------------- /src/main/java/px/internal/source/Defer.kt: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jake Wharton 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | package px.internal.source 17 | 18 | import px.Pollable 19 | 20 | class Defer(val func: () -> Pollable) : Pollable() { 21 | override fun start() = func.invoke().start() 22 | } 23 | -------------------------------------------------------------------------------- /src/main/java/px/internal/source/Empty.kt: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jake Wharton 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | package px.internal.source 17 | 18 | import px.Pollable 19 | 20 | object Empty : Pollable() { 21 | override fun start() = Implementation 22 | 23 | object Implementation : Machine { 24 | override fun poll(): Nothing = throw IllegalStateException("closed") 25 | override fun isComplete() = true 26 | override fun close() = Unit 27 | } 28 | } 29 | -------------------------------------------------------------------------------- /src/main/java/px/internal/source/FromArray.kt: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jake Wharton 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | package px.internal.source 17 | 18 | import px.Pollable 19 | 20 | class FromArray(val items: Array) : Pollable() { 21 | override fun start() = Implementation(items) 22 | 23 | class Implementation(val items: Array, var index: Int = 0) : Machine { 24 | override fun poll(): T? { 25 | if (index < items.size) { 26 | return items[index++] 27 | } 28 | return null 29 | } 30 | 31 | override fun isComplete() = index == items.size 32 | 33 | override fun close() { 34 | index = items.size 35 | } 36 | } 37 | } 38 | -------------------------------------------------------------------------------- /src/main/java/px/internal/source/JustError.kt: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jake Wharton 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | package px.internal.source 17 | 18 | import px.Pollable 19 | 20 | class JustError(val t: Throwable) : Pollable() { 21 | override fun start() = Implementation(t) 22 | 23 | class Implementation(var state: Throwable?) : Machine { 24 | override fun poll(): T? { 25 | val state = this.state ?: throw IllegalStateException("closed") 26 | this.state = null 27 | throw state 28 | } 29 | 30 | override fun isComplete() = state == null 31 | 32 | override fun close() { 33 | state = null 34 | } 35 | } 36 | } 37 | -------------------------------------------------------------------------------- /src/main/java/px/internal/source/JustItem.kt: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jake Wharton 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | package px.internal.source 17 | 18 | import px.Pollable 19 | 20 | class JustItem(val item: T) : Pollable() { 21 | override fun start() = Implementation(item) 22 | 23 | class Implementation(var state: T?) : Machine { 24 | override fun poll(): T? { 25 | val state = this.state 26 | this.state = null 27 | return state 28 | } 29 | 30 | override fun isComplete() = state == null 31 | 32 | override fun close() { 33 | state = null 34 | } 35 | } 36 | } 37 | -------------------------------------------------------------------------------- /src/main/java/px/internal/source/Never.kt: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jake Wharton 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | package px.internal.source 17 | 18 | import px.Pollable 19 | 20 | object Never : Pollable() { 21 | override fun start() = Implementation() 22 | 23 | class Implementation : Machine { 24 | var complete = false 25 | 26 | override fun poll(): Any? { 27 | if (complete) throw IllegalStateException("closed") 28 | return null 29 | } 30 | 31 | override fun isComplete() = complete 32 | 33 | override fun close() { 34 | complete = true 35 | } 36 | } 37 | } 38 | -------------------------------------------------------------------------------- /src/test/java/px/PollableOperatorTest.kt: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jake Wharton 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | package px 17 | 18 | import org.junit.Assert.assertEquals 19 | import org.junit.Assert.assertNull 20 | import org.junit.Assert.assertTrue 21 | import org.junit.Test 22 | 23 | class PollableOperatorTest { 24 | @Test fun map() { 25 | Pollable.just("Hello") 26 | .map { "World" } 27 | .start() 28 | .use { 29 | assertEquals("World", it.poll()) 30 | assertTrue(it.isComplete()) 31 | } 32 | } 33 | 34 | @Test fun flatMap() { 35 | Pollable.just("Hello") 36 | .flatMap { Pollable.from(*it.toCharArray().toTypedArray()) } 37 | .start() 38 | .use { 39 | assertEquals('H', it.poll()) 40 | assertEquals('e', it.poll()) 41 | assertEquals('l', it.poll()) 42 | assertEquals('l', it.poll()) 43 | assertEquals('o', it.poll()) 44 | assertTrue(it.isComplete()) 45 | } 46 | } 47 | 48 | @Test fun filter() { 49 | Pollable.from(1, 2, 3, 4, 5, 6) 50 | .filter { it % 2 == 0 } 51 | .start() 52 | .use { 53 | assertNull(it.poll()) 54 | assertEquals(2, it.poll()) 55 | assertNull(it.poll()) 56 | assertEquals(4, it.poll()) 57 | assertNull(it.poll()) 58 | assertEquals(6, it.poll()) 59 | assertTrue(it.isComplete()) 60 | } 61 | } 62 | } 63 | -------------------------------------------------------------------------------- /src/test/java/px/PollableSourceTest.kt: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jake Wharton 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | package px 17 | 18 | import org.junit.Assert.assertEquals 19 | import org.junit.Assert.assertFalse 20 | import org.junit.Assert.assertNull 21 | import org.junit.Assert.assertSame 22 | import org.junit.Assert.assertTrue 23 | import org.junit.Assert.fail 24 | import org.junit.Test 25 | import px.Pollable.Emitter 26 | import java.util.concurrent.atomic.AtomicReference 27 | 28 | class PollableSourceTest { 29 | @Test fun empty() { 30 | val empty = Pollable.empty() 31 | empty.start().use { 32 | assertTrue(it.isComplete()) 33 | } 34 | } 35 | 36 | @Test fun never() { 37 | val never = Pollable.never() 38 | val machine = never.start() 39 | machine.use { 40 | assertFalse(it.isComplete()) 41 | assertNull(it.poll()) 42 | } 43 | } 44 | 45 | @Test fun just() { 46 | val just = Pollable.just("Hello") 47 | just.start().use { 48 | assertFalse(it.isComplete()) 49 | assertEquals("Hello", it.poll()) 50 | assertTrue(it.isComplete()) 51 | } 52 | } 53 | 54 | @Test fun from() { 55 | val from = Pollable.from("Hello", "World") 56 | from.start().use { 57 | assertFalse(it.isComplete()) 58 | assertEquals("Hello", it.poll()) 59 | assertFalse(it.isComplete()) 60 | assertEquals("World", it.poll()) 61 | assertTrue(it.isComplete()) 62 | } 63 | } 64 | 65 | @Test fun error() { 66 | val exception = RuntimeException("Oops!") 67 | val error = Pollable.error(exception) 68 | error.start().use { 69 | assertFalse(it.isComplete()) 70 | try { 71 | it.poll() 72 | fail() 73 | } catch (t: Throwable) { 74 | assertSame(exception, t) 75 | } 76 | } 77 | } 78 | 79 | @Test fun defer() { 80 | val box = AtomicReference("Hello") 81 | val defer = Pollable.defer { Pollable.just(box.get()) } 82 | box.set("World") 83 | defer.start().use { 84 | assertFalse(it.isComplete()) 85 | assertEquals("World", it.poll()) 86 | assertTrue(it.isComplete()) 87 | } 88 | } 89 | 90 | @Test fun create() { 91 | val emitter = AtomicReference>() 92 | val create = Pollable.create { emitter.set(it) } 93 | create.start().use { 94 | assertFalse(it.isComplete()) 95 | assertNull(it.poll()) 96 | emitter.get().item("Hello") 97 | assertEquals("Hello", it.poll()) 98 | assertFalse(it.isComplete()) 99 | emitter.get().complete() 100 | assertNull(it.poll()) 101 | assertTrue(it.isComplete()) 102 | } 103 | } 104 | } 105 | --------------------------------------------------------------------------------