Feature/coroutines support (#958)

* Add Coroutines suport

Call parse query find as a suspend function
Call login and singup as a suspend function
Call cloud function as a suspend function

* Add coroutines README link at root project

Author: oliveiradev

README.md

@@ -77,6 +77,7 @@ We want to make contributing to this project as easy and transparent as possible
 
  - [Parse FCM](/fcm)
  - [Parse KTX](/ktx)
+ - [Parse Coroutines](/coroutines)
  - [ParseUI](https://github.com/parse-community/ParseUI-Android)
  - [ParseLiveQuery](https://github.com/parse-community/ParseLiveQuery-Android)
  - [ParseFacebookUtils](https://github.com/parse-community/ParseFacebookUtils-Android)

coroutines/.gitignore

@@ -0,0 +1 @@
+/build

coroutines/README.md

@@ -0,0 +1,72 @@
+# Parse SDK Android Coroutines
+Kotlin coroutines support for Parse Android
+
+## Setup
+
+### Installation
+After including JitPack:
+
+```groovy
+dependencies {
+    implementation "com.github.parse-community.Parse-SDK-Android:coroutines:latest.version.here"
+}
+```
+
+## Use Parse Coroutines
+
+### ParseQuery 
+
+Now we can call a parse query using a synchronous style, this is possible when we use coroutines. We need to use a regular coroutine builder: 
+
+```kotlin
+launch { // Coroutine builder
+    val cat = ParseQuery.getQuery(...).find()
+    // get cats without callback
+}
+```
+We use a coroutine builder because `find()` is a suspend function.
+
+### ParseCloud
+
+We can call cloud function inline:
+
+ ```kotlin
+launch { // Coroutine builder
+    val catThumb = callCloudFunction("getThumbnail", mapOf("url" to "https://cat.jpg"))
+    // get cats without callback
+}
+```
+
+### ParseUser
+
+SignUp:
+
+```kotlin
+launch { // Coroutine builder
+    user = ParseUser().apply {
+        setUsername("my name")
+        setPassword("my pass")
+        setEmail("[email protected]")
+    }.also {
+        signUp()
+    }
+}
+```
+Login: 
+
+```kotlin
+launch { // Coroutine builder
+    val user = parseLogIn("username", "password")
+}
+```
+
+## Contributing
+When contributing to the `coroutines` module, please first consider if the extension function you are wanting to add would potentially be better suited in the main `parse` module. If it is something specific to Kotlin users or only useful in a Kotlin project, feel free to make a PR adding it to this module. Otherwise, consider adding the addition to the `parse` module itself, so that it is still usable in Java.
+
+## License
+    Copyright (c) 2015-present, Parse, LLC.
+    All rights reserved.
+
+    This source code is licensed under the BSD-style license found in the
+    LICENSE file in the root directory of this source tree. An additional grant
+    of patent rights can be found in the PATENTS file in the same directory.

coroutines/build.gradle

@@ -0,0 +1,36 @@
+apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
+
+android {
+    compileSdkVersion rootProject.ext.compileSdkVersion
+
+    defaultConfig {
+        minSdkVersion rootProject.ext.minSdkVersion
+        targetSdkVersion rootProject.ext.targetSdkVersion
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    lintOptions {
+        abortOnError false
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+
+}
+
+dependencies {
+    api "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    api 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.2.2'
+    api 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.2.2'
+    implementation project(':parse')
+}
+
+apply from: 'https://raw.githubusercontent.com/Commit451/gradle-android-javadocs/1.1.0/gradle-android-javadocs.gradle'

coroutines/proguard-rules.pro

@@ -0,0 +1,5 @@
+-keepnames class kotlinx.coroutines.internal.MainDispatcherFactory {}
+-keepnames class kotlinx.coroutines.CoroutineExceptionHandler {}
+-keepclassmembernames class kotlinx.** {
+    volatile <fields>;
+}

coroutines/src/main/AndroidManifest.xml

@@ -0,0 +1 @@
+<manifest package="com.parse.coroutines" />

coroutines/src/main/java/com/parse/coroutines/ParseCloudCoroutinesExtensions.kt

@@ -0,0 +1,17 @@
+@file:JvmName("ParseCloudCoroutinesExtensions")
+
+package com.parse.coroutines
+
+import com.parse.ParseCloud
+import kotlin.coroutines.resume
+import kotlin.coroutines.resumeWithException
+import kotlin.coroutines.suspendCoroutine
+
+suspend fun <T> callCloudFunction(functionName: String, params: Map<String, Any>): T {
+    return suspendCoroutine { continuation ->
+        ParseCloud.callFunctionInBackground<T>(functionName, params) { result, e ->
+            if (e == null) continuation.resume(result)
+            else continuation.resumeWithException(e)
+        }
+    }
+}

coroutines/src/main/java/com/parse/coroutines/ParseQueryCoroutinesExtensions.kt

@@ -0,0 +1,36 @@
+@file:JvmName("ParseQueryCoroutinesExtensions")
+@file:Suppress("EXTENSION_SHADOWED_BY_MEMBER")
+
+package com.parse.coroutines
+
+import com.parse.ParseObject
+import com.parse.ParseQuery
+import kotlinx.coroutines.suspendCancellableCoroutine
+import kotlin.coroutines.resume
+import kotlin.coroutines.resumeWithException
+
+suspend fun <T : ParseObject> ParseQuery<T>.find(): List<T> {
+    return suspendCancellableCoroutine { continuation ->
+        continuation.invokeOnCancellation {
+            cancel()
+        }
+
+        findInBackground { objects, e ->
+            if (e == null) continuation.resume(objects)
+            else continuation.resumeWithException(e)
+        }
+    }
+}
+
+suspend fun <T : ParseObject> ParseQuery<T>.count(): Int {
+    return suspendCancellableCoroutine { continuation ->
+        continuation.invokeOnCancellation {
+            cancel()
+        }
+
+        countInBackground { count, e ->
+            if (e == null) continuation.resume(count)
+            else continuation.resumeWithException(e)
+        }
+    }
+}

coroutines/src/main/java/com/parse/coroutines/ParseUserCoroutinesExtensions.kt

@@ -0,0 +1,26 @@
+@file:JvmName("ParseUserCoroutinesExtensions")
+
+package com.parse.coroutines
+
+import com.parse.ParseUser
+import kotlin.coroutines.resume
+import kotlin.coroutines.resumeWithException
+import kotlin.coroutines.suspendCoroutine
+
+suspend fun ParseUser.singUp(): ParseUser {
+    return suspendCoroutine { continuation ->
+        signUpInBackground { e ->
+            if (e == null) continuation.resume(this)
+            else continuation.resumeWithException(e)
+        }
+    }
+}
+
+suspend fun parseLogIn(username: String, password: String): ParseUser {
+    return suspendCoroutine { continuation ->
+        ParseUser.logInInBackground(username, password) { user, e ->
+            if (e == null) continuation.resume(user)
+            else continuation.resumeWithException(e)
+        }
+    }
+}

settings.gradle

@@ -1,2 +1,2 @@
-include ':parse', ':fcm', ':gcm', ':ktx'
+include ':parse', ':fcm', ':gcm', ':ktx', ':coroutines'