Implement BackgroundPollWorker

build.gradle

@@ -6,6 +6,7 @@ buildscript {
     ext.gradle_version = "3.4.1"
     ext.kotlin_version = "1.3.31"
     ext.kovenant_version = "3.3.0"
+    ext.work_manager_version = "2.1.0"
 
     repositories {
         google()
@@ -179,6 +180,7 @@ dependencies {
     implementation "com.squareup.okhttp3:okhttp:3.12.1"
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
     implementation "nl.komponents.kovenant:kovenant:$kovenant_version"
+    implementation "androidx.work:work-runtime-ktx:$work_manager_version"
 }
 
 android {

src/org/thoughtcrime/securesms/loki/BackgroundPollWorker.kt

@@ -0,0 +1,20 @@
+package org.thoughtcrime.securesms.loki
+
+import android.content.Context
+import androidx.work.Worker
+import androidx.work.WorkerParameters
+import org.whispersystems.signalservice.loki.api.LokiAPI
+import org.whispersystems.signalservice.loki.api.LokiAPIDatabaseProtocol
+
+class BackgroundPollWorker(private val userHexEncodedPublicKey: String, private val apiDatabase: LokiAPIDatabaseProtocol, context: Context, parameters: WorkerParameters) : Worker(context, parameters) {
+
+    override fun doWork(): Result {
+        return try {
+            LokiAPI(userHexEncodedPublicKey, apiDatabase).getMessages().get()
+            // TODO: Process envelopes
+            Result.success()
+        } catch (exception: Exception) {
+            Result.failure()
+        }
+    }
+}