Merge pull request #354 from metaphore/background-polling

Use WorkManager API for Background Polling
This commit is contained in:
Niels Andriesse 2020-11-18 09:05:20 +11:00 committed by GitHub
commit 9d8514d7c9
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17 changed files with 143 additions and 310 deletions

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@ -683,7 +683,7 @@
</receiver>
<!-- Session -->
<receiver
android:name="org.thoughtcrime.securesms.loki.api.BackgroundPollListener"
android:name="org.thoughtcrime.securesms.loki.api.BackgroundPollWorker$BootBroadcastReceiver"
android:enabled="true">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
@ -701,13 +701,6 @@
<receiver
android:name="org.thoughtcrime.securesms.jobmanager.AlarmManagerScheduler$RetryReceiver"
android:enabled="@bool/enable_alarm_manager" /> <!-- Probably don't need this one -->
<receiver
android:name="org.thoughtcrime.securesms.jobmanager.BootReceiver"
android:enabled="true">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
<uses-library
android:name="com.sec.android.app.multiwindow"

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@ -89,6 +89,7 @@ dependencies {
implementation 'androidx.multidex:multidex:2.0.1'
implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
implementation 'androidx.lifecycle:lifecycle-common-java8:2.2.0'
implementation "androidx.work:work-runtime-ktx:2.4.0"
implementation ("com.google.firebase:firebase-messaging:18.0.0") {
exclude group: 'com.google.firebase', module: 'firebase-core'
@ -256,6 +257,10 @@ android {
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
packagingOptions {
exclude 'LICENSE.txt'
exclude 'LICENSE'

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@ -62,7 +62,7 @@ import org.thoughtcrime.securesms.logging.Log;
import org.thoughtcrime.securesms.logging.PersistentLogger;
import org.thoughtcrime.securesms.logging.UncaughtExceptionLogger;
import org.thoughtcrime.securesms.loki.activities.HomeActivity;
import org.thoughtcrime.securesms.loki.api.BackgroundPollListener;
import org.thoughtcrime.securesms.loki.api.BackgroundPollWorker;
import org.thoughtcrime.securesms.loki.api.ClosedGroupPoller;
import org.thoughtcrime.securesms.loki.api.LokiPushNotificationManager;
import org.thoughtcrime.securesms.loki.api.PublicChatManager;
@ -389,7 +389,7 @@ public class ApplicationContext extends MultiDexApplication implements Dependenc
RotateSignedPreKeyListener.schedule(this);
LocalBackupListener.schedule(this);
RotateSenderCertificateListener.schedule(this);
BackgroundPollListener.schedule(this); // Loki
BackgroundPollWorker.schedulePeriodic(this); // Loki
if (BuildConfig.PLAY_STORE_DISABLED) {
UpdateApkRefreshListener.schedule(this);

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@ -94,8 +94,9 @@ public class SQLCipherOpenHelper extends SQLiteOpenHelper {
private static final int lokiV15 = 36;
private static final int lokiV16 = 37;
private static final int lokiV17 = 38;
private static final int lokiV18_CLEAR_BG_POLL_JOBS = 39;
private static final int DATABASE_VERSION = lokiV17;
private static final int DATABASE_VERSION = lokiV18_CLEAR_BG_POLL_JOBS; // Loki - onUpgrade(...) must be updated to use Loki version numbers if Signal makes any database changes
private static final String DATABASE_NAME = "signal.db";
private final Context context;
@ -634,7 +635,7 @@ public class SQLCipherOpenHelper extends SQLiteOpenHelper {
if (oldVersion < lokiV15) {
db.execSQL(SharedSenderKeysDatabase.getCreateOldClosedGroupRatchetTableCommand());
}
if (oldVersion < lokiV16) {
db.execSQL(LokiAPIDatabase.getCreateOpenGroupProfilePictureTableCommand());
}
@ -644,6 +645,12 @@ public class SQLCipherOpenHelper extends SQLiteOpenHelper {
db.execSQL("ALTER TABLE part ADD COLUMN audio_duration INTEGER");
}
if (oldVersion < lokiV18_CLEAR_BG_POLL_JOBS) {
// BackgroundPollJob was replaced with BackgroundPollWorker. Clear all the scheduled job records.
db.execSQL("DELETE FROM job_spec WHERE factory_key = 'BackgroundPollJob'");
db.execSQL("DELETE FROM constraint_spec WHERE factory_key = 'BackgroundPollJob'");
}
db.setTransactionSuccessful();
} finally {
db.endTransaction();

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@ -1,17 +0,0 @@
package org.thoughtcrime.securesms.jobmanager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import org.thoughtcrime.securesms.logging.Log;
public class BootReceiver extends BroadcastReceiver {
private static final String TAG = BootReceiver.class.getSimpleName();
@Override
public void onReceive(Context context, Intent intent) {
Log.i(TAG, "Boot received. Application is created, kickstarting JobManager.");
}
}

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@ -23,6 +23,10 @@ import java.util.concurrent.TimeUnit;
* {@link #serialize()}. Your job is then recreated using a {@link Factory} that you register in
* {@link JobManager.Configuration.Builder#setJobFactories(Map)}, which is given the saved
* {@link Data} bundle.
*
* @deprecated
* use <a href="https://developer.android.com/reference/androidx/work/WorkManager">WorkManager</a>
* API instead.
*/
public abstract class Job {

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@ -7,7 +7,6 @@ import androidx.annotation.NonNull;
import org.thoughtcrime.securesms.jobmanager.impl.DefaultExecutorFactory;
import org.thoughtcrime.securesms.jobmanager.impl.JsonDataSerializer;
import org.thoughtcrime.securesms.jobmanager.migration.WorkManagerMigrator;
import org.thoughtcrime.securesms.jobmanager.persistence.JobStorage;
import org.thoughtcrime.securesms.logging.Log;
import org.thoughtcrime.securesms.util.Debouncer;
@ -52,11 +51,6 @@ public class JobManager implements ConstraintObserver.Notifier {
this::onEmptyQueue);
executor.execute(() -> {
if (WorkManagerMigrator.needsMigration(application)) {
Log.i(TAG, "Detected an old WorkManager database. Migrating.");
WorkManagerMigrator.migrate(application, configuration.getJobStorage(), configuration.getDataSerializer());
}
jobController.init();
for (int i = 0; i < jobRunners.length; i++) {

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@ -1,101 +0,0 @@
package org.thoughtcrime.securesms.jobmanager.migration;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import org.thoughtcrime.securesms.jobmanager.Data;
import org.thoughtcrime.securesms.jobmanager.Job;
import org.thoughtcrime.securesms.jobmanager.impl.NetworkConstraint;
import org.thoughtcrime.securesms.jobmanager.persistence.ConstraintSpec;
import org.thoughtcrime.securesms.jobmanager.persistence.FullSpec;
import org.thoughtcrime.securesms.jobmanager.persistence.JobSpec;
import org.thoughtcrime.securesms.logging.Log;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.TimeUnit;
final class WorkManagerDatabase extends SQLiteOpenHelper {
private static final String TAG = WorkManagerDatabase.class.getSimpleName();
static final String DB_NAME = "androidx.work.workdb";
WorkManagerDatabase(@NonNull Context context) {
super(context, DB_NAME, null, 5);
}
@Override
public void onCreate(SQLiteDatabase db) {
throw new UnsupportedOperationException("We should never be creating this database, only migrating an existing one!");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// There's a chance that a user who hasn't upgraded in > 6 months could hit this onUpgrade path,
// but we don't use any of the columns that were added in any migrations they could hit, so we
// can ignore this.
Log.w(TAG, "Hit onUpgrade path from " + oldVersion + " to " + newVersion);
}
@NonNull List<FullSpec> getAllJobs(@NonNull Data.Serializer dataSerializer) {
SQLiteDatabase db = getReadableDatabase();
String[] columns = new String[] { "id", "worker_class_name", "input", "required_network_type"};
List<FullSpec> fullSpecs = new LinkedList<>();
try (Cursor cursor = db.query("WorkSpec", columns, null, null, null, null, null)) {
while (cursor != null && cursor.moveToNext()) {
String factoryName = WorkManagerFactoryMappings.getFactoryKey(cursor.getString(cursor.getColumnIndexOrThrow("worker_class_name")));
if (factoryName != null) {
String id = cursor.getString(cursor.getColumnIndexOrThrow("id"));
byte[] data = cursor.getBlob(cursor.getColumnIndexOrThrow("input"));
List<ConstraintSpec> constraints = new LinkedList<>();
JobSpec jobSpec = new JobSpec(id,
factoryName,
getQueueKey(id),
System.currentTimeMillis(),
0,
0,
Job.Parameters.UNLIMITED,
TimeUnit.SECONDS.toMillis(30),
TimeUnit.DAYS.toMillis(1),
Job.Parameters.UNLIMITED,
dataSerializer.serialize(DataMigrator.convert(data)),
false);
if (cursor.getInt(cursor.getColumnIndexOrThrow("required_network_type")) != 0) {
constraints.add(new ConstraintSpec(id, NetworkConstraint.KEY));
}
fullSpecs.add(new FullSpec(jobSpec, constraints, Collections.emptyList()));
} else {
Log.w(TAG, "Failed to find a matching factory for worker class: " + factoryName);
}
}
}
return fullSpecs;
}
private @Nullable String getQueueKey(@NonNull String jobId) {
String query = "work_spec_id = ?";
String[] args = new String[] { jobId };
try (Cursor cursor = getReadableDatabase().query("WorkName", null, query, args, null, null, null)) {
if (cursor != null && cursor.moveToFirst()) {
return cursor.getString(cursor.getColumnIndexOrThrow("name"));
}
}
return null;
}
}

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@ -44,7 +44,6 @@ import org.thoughtcrime.securesms.jobs.SmsSentJob;
import org.thoughtcrime.securesms.jobs.TrimThreadJob;
import org.thoughtcrime.securesms.jobs.TypingSendJob;
import org.thoughtcrime.securesms.jobs.UpdateApkJob;
import org.thoughtcrime.securesms.loki.api.BackgroundPollJob;
import org.thoughtcrime.securesms.loki.api.PrepareAttachmentAudioExtrasJob;
import org.thoughtcrime.securesms.loki.protocol.ClosedGroupUpdateMessageSendJob;
import org.thoughtcrime.securesms.loki.protocol.NullMessageSendJob;
@ -60,7 +59,6 @@ public class WorkManagerFactoryMappings {
put(AttachmentDownloadJob.class.getName(), AttachmentDownloadJob.KEY);
put(AttachmentUploadJob.class.getName(), AttachmentUploadJob.KEY);
put(AvatarDownloadJob.class.getName(), AvatarDownloadJob.KEY);
put(BackgroundPollJob.class.getName(), BackgroundPollJob.KEY);
put(CleanPreKeysJob.class.getName(), CleanPreKeysJob.KEY);
put(ClosedGroupUpdateMessageSendJob.class.getName(), ClosedGroupUpdateMessageSendJob.KEY);
put(CreateSignedPreKeyJob.class.getName(), CreateSignedPreKeyJob.KEY);

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@ -1,45 +0,0 @@
package org.thoughtcrime.securesms.jobmanager.migration;
import android.annotation.SuppressLint;
import android.content.Context;
import androidx.annotation.NonNull;
import androidx.annotation.WorkerThread;
import org.thoughtcrime.securesms.jobmanager.Data;
import org.thoughtcrime.securesms.jobmanager.persistence.FullSpec;
import org.thoughtcrime.securesms.jobmanager.persistence.JobStorage;
import org.thoughtcrime.securesms.logging.Log;
import java.util.List;
public class WorkManagerMigrator {
private static final String TAG = Log.tag(WorkManagerMigrator.class);
@SuppressLint("DefaultLocale")
@WorkerThread
public static synchronized void migrate(@NonNull Context context,
@NonNull JobStorage jobStorage,
@NonNull Data.Serializer dataSerializer)
{
long startTime = System.currentTimeMillis();
Log.i(TAG, "Beginning WorkManager migration.");
WorkManagerDatabase database = new WorkManagerDatabase(context);
List<FullSpec> fullSpecs = database.getAllJobs(dataSerializer);
for (FullSpec fullSpec : fullSpecs) {
Log.i(TAG, String.format("Migrating job with key '%s' and %d constraint(s).", fullSpec.getJobSpec().getFactoryKey(), fullSpec.getConstraintSpecs().size()));
}
jobStorage.insertJobs(fullSpecs);
context.deleteDatabase(WorkManagerDatabase.DB_NAME);
Log.i(TAG, String.format("WorkManager migration finished. Migrated %d job(s) in %d ms.", fullSpecs.size(), System.currentTimeMillis() - startTime));
}
@WorkerThread
public static synchronized boolean needsMigration(@NonNull Context context) {
return context.getDatabasePath(WorkManagerDatabase.DB_NAME).exists();
}
}

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@ -6,6 +6,11 @@ import org.thoughtcrime.securesms.jobmanager.Job;
import org.thoughtcrime.securesms.jobmanager.JobLogger;
import org.thoughtcrime.securesms.logging.Log;
/**
* @deprecated
* use <a href="https://developer.android.com/reference/androidx/work/WorkManager">WorkManager</a>
* API instead.
*/
public abstract class BaseJob extends Job {
private static final String TAG = BaseJob.class.getSimpleName();

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@ -14,7 +14,6 @@ import org.thoughtcrime.securesms.jobmanager.impl.NetworkConstraintObserver;
import org.thoughtcrime.securesms.jobmanager.impl.NetworkOrCellServiceConstraint;
import org.thoughtcrime.securesms.jobmanager.impl.SqlCipherMigrationConstraint;
import org.thoughtcrime.securesms.jobmanager.impl.SqlCipherMigrationConstraintObserver;
import org.thoughtcrime.securesms.loki.api.BackgroundPollJob;
import org.thoughtcrime.securesms.loki.api.PrepareAttachmentAudioExtrasJob;
import org.thoughtcrime.securesms.loki.protocol.ClosedGroupUpdateMessageSendJob;
import org.thoughtcrime.securesms.loki.protocol.NullMessageSendJob;
@ -33,7 +32,6 @@ public final class JobManagerFactories {
put(AttachmentDownloadJob.KEY, new AttachmentDownloadJob.Factory());
put(AttachmentUploadJob.KEY, new AttachmentUploadJob.Factory());
put(AvatarDownloadJob.KEY, new AvatarDownloadJob.Factory());
put(BackgroundPollJob.KEY, new BackgroundPollJob.Factory());
put(CleanPreKeysJob.KEY, new CleanPreKeysJob.Factory());
put(ClosedGroupUpdateMessageSendJob.KEY, new ClosedGroupUpdateMessageSendJob.Factory());
put(CreateSignedPreKeyJob.KEY, new CreateSignedPreKeyJob.Factory());

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@ -1,87 +0,0 @@
package org.thoughtcrime.securesms.loki.api
import android.content.Context
import kotlinx.coroutines.awaitAll
import nl.komponents.kovenant.Promise
import nl.komponents.kovenant.all
import nl.komponents.kovenant.functional.map
import org.thoughtcrime.securesms.ApplicationContext
import org.thoughtcrime.securesms.database.DatabaseFactory
import org.thoughtcrime.securesms.dependencies.InjectableType
import org.thoughtcrime.securesms.jobmanager.Data
import org.thoughtcrime.securesms.jobmanager.Job
import org.thoughtcrime.securesms.jobmanager.impl.NetworkConstraint
import org.thoughtcrime.securesms.jobs.BaseJob
import org.thoughtcrime.securesms.jobs.PushContentReceiveJob
import org.thoughtcrime.securesms.jobs.RotateCertificateJob
import org.thoughtcrime.securesms.logging.Log
import org.thoughtcrime.securesms.util.TextSecurePreferences
import org.whispersystems.signalservice.api.SignalServiceAccountManager
import org.whispersystems.signalservice.api.messages.SignalServiceEnvelope
import org.whispersystems.signalservice.api.push.exceptions.PushNetworkException
import org.whispersystems.signalservice.loki.api.SnodeAPI
import java.io.IOException
import java.util.concurrent.TimeUnit
import javax.inject.Inject
class BackgroundPollJob private constructor(parameters: Parameters) : BaseJob(parameters) {
companion object {
const val KEY = "BackgroundPollJob"
}
constructor(context: Context) : this(Parameters.Builder()
.addConstraint(NetworkConstraint.KEY)
.setQueue(KEY)
.setLifespan(TimeUnit.DAYS.toMillis(1))
.setMaxAttempts(Parameters.UNLIMITED)
.build()) {
setContext(context)
}
override fun serialize(): Data {
return Data.EMPTY
}
override fun getFactoryKey(): String { return KEY }
public override fun onRun() {
try {
Log.d("Loki", "Performing background poll.")
val userPublicKey = TextSecurePreferences.getLocalNumber(context)
val promises = mutableListOf<Promise<Unit, Exception>>()
if (!TextSecurePreferences.isUsingFCM(context)) {
Log.d("Loki", "Not using FCM; polling for contacts and closed groups.")
val promise = SnodeAPI.shared.getMessages(userPublicKey).map { envelopes ->
envelopes.forEach {
PushContentReceiveJob(context).processEnvelope(SignalServiceEnvelope(it), false)
}
}
promises.add(promise)
promises.addAll(ClosedGroupPoller.shared.pollOnce())
}
val openGroups = DatabaseFactory.getLokiThreadDatabase(context).getAllPublicChats().map { it.value }
for (openGroup in openGroups) {
val poller = PublicChatPoller(context, openGroup)
poller.stop()
promises.add(poller.pollForNewMessages())
}
all(promises).get()
} catch (exception: Exception) {
Log.d("Loki", "Background poll failed due to error: $exception.")
}
}
public override fun onShouldRetry(e: Exception): Boolean {
return false
}
override fun onCanceled() { }
class Factory : Job.Factory<BackgroundPollJob> {
override fun create(parameters: Parameters, data: Data): BackgroundPollJob {
return BackgroundPollJob(parameters)
}
}
}

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@ -1,36 +0,0 @@
package org.thoughtcrime.securesms.loki.api
import android.content.Context
import android.content.Intent
import nl.komponents.kovenant.functional.map
import org.thoughtcrime.securesms.ApplicationContext
import org.thoughtcrime.securesms.database.DatabaseFactory
import org.thoughtcrime.securesms.jobs.PushContentReceiveJob
import org.thoughtcrime.securesms.service.PersistentAlarmManagerListener
import org.thoughtcrime.securesms.util.TextSecurePreferences
import org.whispersystems.signalservice.api.messages.SignalServiceEnvelope
import org.whispersystems.signalservice.loki.api.SnodeAPI
import java.util.concurrent.TimeUnit
class BackgroundPollListener : PersistentAlarmManagerListener() {
companion object {
private val pollInterval = TimeUnit.MINUTES.toMillis(15)
@JvmStatic
fun schedule(context: Context) {
BackgroundPollListener().onReceive(context, Intent())
}
}
override fun getNextScheduledExecutionTime(context: Context): Long {
return TextSecurePreferences.getBackgroundPollTime(context)
}
override fun onAlarm(context: Context, scheduledTime: Long): Long {
ApplicationContext.getInstance(context).jobManager.add(BackgroundPollJob(context))
val nextTime = System.currentTimeMillis() + pollInterval
TextSecurePreferences.setBackgroundPollTime(context, nextTime)
return nextTime
}
}

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@ -0,0 +1,113 @@
package org.thoughtcrime.securesms.loki.api
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import androidx.work.*
import nl.komponents.kovenant.Promise
import nl.komponents.kovenant.all
import nl.komponents.kovenant.functional.map
import org.thoughtcrime.securesms.database.DatabaseFactory
import org.thoughtcrime.securesms.jobs.PushContentReceiveJob
import org.thoughtcrime.securesms.logging.Log
import org.thoughtcrime.securesms.util.TextSecurePreferences
import org.whispersystems.signalservice.api.messages.SignalServiceEnvelope
import org.whispersystems.signalservice.loki.api.SnodeAPI
import java.util.concurrent.TimeUnit
class BackgroundPollWorker(val context: Context, params: WorkerParameters) : Worker(context, params) {
companion object {
const val TAG = "BackgroundPollWorker"
private const val RETRY_ATTEMPTS = 3
@JvmStatic
fun scheduleInstant(context: Context) {
val workRequest = OneTimeWorkRequestBuilder<BackgroundPollWorker>()
.setConstraints(
Constraints.Builder()
.setRequiredNetworkType(NetworkType.CONNECTED)
.build()
)
.build()
WorkManager
.getInstance(context)
.enqueue(workRequest)
}
@JvmStatic
fun schedulePeriodic(context: Context) {
Log.v(TAG, "Scheduling periodic work.")
val workRequest = PeriodicWorkRequestBuilder<BackgroundPollWorker>(15, TimeUnit.MINUTES)
.setConstraints(
Constraints.Builder()
.setRequiredNetworkType(NetworkType.CONNECTED)
.build()
)
.build()
WorkManager
.getInstance(context)
.enqueueUniquePeriodicWork(
TAG,
ExistingPeriodicWorkPolicy.KEEP,
workRequest
)
}
}
override fun doWork(): Result {
if (TextSecurePreferences.getLocalNumber(context) == null) {
Log.v(TAG, "Background poll is canceled due to the Session user is not set up yet.")
return Result.failure()
}
try {
Log.v(TAG, "Performing background poll.")
val promises = mutableListOf<Promise<Unit, Exception>>()
// Private chats
val userPublicKey = TextSecurePreferences.getLocalNumber(context)
val privateChatsPromise = SnodeAPI.shared.getMessages(userPublicKey).map { envelopes ->
envelopes.forEach {
PushContentReceiveJob(context).processEnvelope(SignalServiceEnvelope(it), false)
}
}
promises.add(privateChatsPromise)
// Closed groups
val sskDatabase = DatabaseFactory.getSSKDatabase(context)
ClosedGroupPoller.configureIfNeeded(context, sskDatabase)
promises.addAll(ClosedGroupPoller.shared.pollOnce())
// Open Groups
val openGroups = DatabaseFactory.getLokiThreadDatabase(context).getAllPublicChats().map { it.value }
for (openGroup in openGroups) {
val poller = PublicChatPoller(context, openGroup)
promises.add(poller.pollForNewMessages())
}
// Wait till all the promises get resolved
all(promises).get()
return Result.success()
} catch (exception: Exception) {
Log.v(TAG, "Background poll failed due to error: ${exception.message}.", exception)
return if (runAttemptCount < RETRY_ATTEMPTS) Result.retry() else Result.failure()
}
}
class BootBroadcastReceiver: BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
if (intent.action == Intent.ACTION_BOOT_COMPLETED) {
Log.v(TAG, "Boot broadcast caught.")
BackgroundPollWorker.scheduleInstant(context)
BackgroundPollWorker.schedulePeriodic(context)
}
}
}
}

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@ -17,7 +17,7 @@ import org.whispersystems.signalservice.loki.utilities.getRandomElementOrNull
class ClosedGroupPoller private constructor(private val context: Context, private val database: SharedSenderKeysDatabase) {
private var isPolling = false
private val handler = Handler()
private val handler: Handler by lazy { Handler() }
private val task = object : Runnable {

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@ -3,6 +3,7 @@ package org.thoughtcrime.securesms.loki.api
import android.content.Context
import android.os.Handler
import android.util.Log
import androidx.annotation.WorkerThread
import nl.komponents.kovenant.Promise
import nl.komponents.kovenant.functional.bind
import nl.komponents.kovenant.functional.map
@ -30,9 +31,10 @@ import org.whispersystems.signalservice.loki.api.opengroups.PublicChatMessage
import org.whispersystems.signalservice.loki.protocol.shelved.multidevice.MultiDeviceProtocol
import java.security.MessageDigest
import java.util.*
import java.util.concurrent.CompletableFuture
class PublicChatPoller(private val context: Context, private val group: PublicChat) {
private val handler = Handler()
private val handler by lazy { Handler() }
private var hasStarted = false
private var isPollOngoing = false
public var isCaughtUp = false