refactor: performance improvements in batch message processing, synchronized cache access and audible message notifications.

Increase audible timeout on DefaultMessageNotifier.java, don't send in-thread notification based on last audible notification.

Create a batch message receive job to handle up to 20 chunked messages at a time per job instead of singular or open group poll amount

Remove synchronized access to recipient cache and replace with a concurrent cache that's lock free from perf tracing monitor contention

app/src/main/java/org/thoughtcrime/securesms/notifications/DefaultMessageNotifier.java

@@ -97,7 +97,7 @@ public class DefaultMessageNotifier implements MessageNotifier {
   private static final int    SUMMARY_NOTIFICATION_ID    = 1338;
   private static final int    PENDING_MESSAGES_ID       = 1111;
   private static final String NOTIFICATION_GROUP        = "messages";
-  private static final long   MIN_AUDIBLE_PERIOD_MILLIS = TimeUnit.SECONDS.toMillis(2);
+  private static final long   MIN_AUDIBLE_PERIOD_MILLIS = TimeUnit.SECONDS.toMillis(5);
   private static final long   DESKTOP_ACTIVITY_PERIOD   = TimeUnit.MINUTES.toMillis(1);
 
   private volatile static       long               visibleThread                = -1;
@@ -440,9 +440,12 @@ public class DefaultMessageNotifier implements MessageNotifier {
 
   private void sendInThreadNotification(Context context, Recipient recipient) {
     if (!TextSecurePreferences.isInThreadNotifications(context) ||
-        ServiceUtil.getAudioManager(context).getRingerMode() != AudioManager.RINGER_MODE_NORMAL)
+            ServiceUtil.getAudioManager(context).getRingerMode() != AudioManager.RINGER_MODE_NORMAL ||
+            (System.currentTimeMillis() - lastAudibleNotification) < MIN_AUDIBLE_PERIOD_MILLIS)
     {
       return;
+    } else {
+      lastAudibleNotification = System.currentTimeMillis();
     }
 
     Uri uri = null;

libsession/src/main/java/org/session/libsession/database/StorageProtocol.kt

@@ -5,7 +5,6 @@ import android.net.Uri
 import org.session.libsession.messaging.contacts.Contact
 import org.session.libsession.messaging.jobs.AttachmentUploadJob
 import org.session.libsession.messaging.jobs.Job
-import org.session.libsession.messaging.jobs.MessageReceiveJob
 import org.session.libsession.messaging.jobs.MessageSendJob
 import org.session.libsession.messaging.messages.control.ConfigurationMessage
 import org.session.libsession.messaging.messages.visible.Attachment
@@ -43,7 +42,7 @@ interface StorageProtocol {
     fun getAllPendingJobs(type: String): Map<String,Job?>
     fun getAttachmentUploadJob(attachmentID: Long): AttachmentUploadJob?
     fun getMessageSendJob(messageSendJobID: String): MessageSendJob?
-    fun getMessageReceiveJob(messageReceiveJobID: String): MessageReceiveJob?
+    fun getMessageReceiveJob(messageReceiveJobID: String): Job?
     fun resumeMessageSendJobIfNeeded(messageSendJobID: String)
     fun isJobCanceled(job: Job): Boolean
 

libsession/src/main/java/org/session/libsession/messaging/jobs/BatchMessageReceiveJob.kt

@@ -0,0 +1,120 @@
+package org.session.libsession.messaging.jobs
+
+import com.google.protobuf.ByteString
+import nl.komponents.kovenant.Promise
+import nl.komponents.kovenant.task
+import org.session.libsession.messaging.sending_receiving.MessageReceiver
+import org.session.libsession.messaging.sending_receiving.handle
+import org.session.libsession.messaging.utilities.Data
+import org.session.libsignal.protos.UtilProtos
+import org.session.libsignal.utilities.Log
+
+data class MessageReceiveParameters(
+    val data: ByteArray,
+    val serverHash: String? = null,
+    val openGroupMessageServerID: Long? = null
+)
+
+class BatchMessageReceiveJob(
+    val messages: List<MessageReceiveParameters>,
+    val openGroupID: String? = null
+) : Job {
+
+    override var delegate: JobDelegate? = null
+    override var id: String? = null
+    override var failureCount: Int = 0
+    override val maxFailureCount: Int = 10
+    // Failure Exceptions must be retryable if they're a  MessageReceiver.Error
+    val failures = mutableListOf<MessageReceiveParameters>()
+
+    companion object {
+        const val TAG = "BatchMessageReceiveJob"
+        const val KEY = "BatchMessageReceiveJob"
+
+        // Keys used for database storage
+        private val NUM_MESSAGES_KEY = "numMessages"
+        private val DATA_KEY = "data"
+        private val SERVER_HASH_KEY = "serverHash"
+        private val OPEN_GROUP_MESSAGE_SERVER_ID_KEY = "openGroupMessageServerID"
+        private val OPEN_GROUP_ID_KEY = "open_group_id"
+    }
+
+    override fun execute() {
+        executeAsync().get()
+    }
+
+    fun executeAsync(): Promise<Unit, Exception> {
+        return task {
+            messages.forEach { messageParameters ->
+                val (data, serverHash, openGroupMessageServerID) = messageParameters
+                try {
+                    val (message, proto) = MessageReceiver.parse(data, openGroupMessageServerID)
+                    message.serverHash = serverHash
+                    MessageReceiver.handle(message, proto, this.openGroupID)
+                } catch (e: Exception) {
+                    Log.e(TAG, "Couldn't receive message.", e)
+                    if (e is MessageReceiver.Error && !e.isRetryable) {
+                        Log.e(TAG, "Message failed permanently",e)
+                    } else {
+                        Log.e(TAG, "Message failed",e)
+                        failures += messageParameters
+                    }
+                }
+            }
+            if (failures.isEmpty()) {
+                handleSuccess()
+            } else {
+                handleFailure()
+            }
+        }
+    }
+
+    private fun handleSuccess() {
+        this.delegate?.handleJobSucceeded(this)
+    }
+
+    private fun handleFailure() {
+        this.delegate?.handleJobFailed(this, Exception("One or more jobs resulted in failure"))
+    }
+
+    override fun serialize(): Data {
+        val arraySize = messages.size
+        val dataArrays = UtilProtos.ByteArrayList.newBuilder()
+            .addAllContent(messages.map(MessageReceiveParameters::data).map(ByteString::copyFrom))
+            .build()
+        val serverHashes = messages.map { it.serverHash.orEmpty() }
+        val openGroupServerIds = messages.map { it.openGroupMessageServerID ?: -1L }
+        return Data.Builder()
+            .putInt(NUM_MESSAGES_KEY, arraySize)
+            .putByteArray(DATA_KEY, dataArrays.toByteArray())
+            .putString(OPEN_GROUP_ID_KEY, openGroupID)
+            .putLongArray(OPEN_GROUP_MESSAGE_SERVER_ID_KEY, openGroupServerIds.toLongArray())
+            .putStringArray(SERVER_HASH_KEY, serverHashes.toTypedArray())
+            .build()
+    }
+
+    override fun getFactoryKey(): String = KEY
+
+    class Factory : Job.Factory<BatchMessageReceiveJob> {
+        override fun create(data: Data): BatchMessageReceiveJob {
+            val numMessages = data.getInt(NUM_MESSAGES_KEY)
+            val dataArrays = data.getByteArray(DATA_KEY)
+            val contents =
+                UtilProtos.ByteArrayList.parseFrom(dataArrays).contentList.map(ByteString::toByteArray)
+            val serverHashes =
+                if (data.hasStringArray(SERVER_HASH_KEY)) data.getStringArray(SERVER_HASH_KEY) else arrayOf()
+            val openGroupMessageServerIDs = data.getLongArray(OPEN_GROUP_MESSAGE_SERVER_ID_KEY)
+            val openGroupID = data.getStringOrDefault(OPEN_GROUP_ID_KEY, null)
+
+            val parameters = (0 until numMessages).map { index ->
+                val data = contents[index]
+                val serverHash = serverHashes[index].let { if (it.isEmpty()) null else it }
+                val serverId = openGroupMessageServerIDs[index].let { if (it == -1L) null else it }
+                MessageReceiveParameters(data, serverHash, serverId)
+            }
+
+            return BatchMessageReceiveJob(parameters, openGroupID)
+        }
+    }
+
+}

libsession/src/main/java/org/session/libsession/messaging/jobs/JobQueue.kt

@@ -5,7 +5,6 @@ import kotlinx.coroutines.channels.Channel
 import kotlinx.coroutines.channels.Channel.Factory.UNLIMITED
 import org.session.libsession.messaging.MessagingModuleConfiguration
 import org.session.libsignal.utilities.Log
-import java.lang.IllegalStateException
 import java.util.*
 import java.util.concurrent.ConcurrentHashMap
 import java.util.concurrent.Executors
@@ -51,7 +50,7 @@ class JobQueue : JobDelegate {
                     when (job) {
                         is NotifyPNServerJob, is AttachmentUploadJob, is MessageSendJob -> txQueue.send(job)
                         is AttachmentDownloadJob -> attachmentQueue.send(job)
-                        is MessageReceiveJob, is TrimThreadJob -> rxQueue.send(job)
+                        is MessageReceiveJob, is BatchMessageReceiveJob, is TrimThreadJob -> rxQueue.send(job)
                         else -> throw IllegalStateException("Unexpected job type.")
                     }
                 }
@@ -128,7 +127,8 @@ class JobQueue : JobDelegate {
             AttachmentDownloadJob.KEY,
             MessageReceiveJob.KEY,
             MessageSendJob.KEY,
-            NotifyPNServerJob.KEY
+            NotifyPNServerJob.KEY,
+            BatchMessageReceiveJob.KEY
         )
         allJobTypes.forEach { type ->
             resumePendingJobs(type)
@@ -152,6 +152,11 @@ class JobQueue : JobDelegate {
             Log.i("Loki", "Message send job waiting for attachment upload to finish.")
             return
         }
+        // Batch message receive job, re-queue non-permanently failed jobs
+        if (job is BatchMessageReceiveJob) {
+            val replacementParameters = job.failures
+        }
+
         // Regular job failure
         job.failureCount += 1
         if (job.failureCount >= job.maxFailureCount) {

libsession/src/main/java/org/session/libsession/messaging/jobs/MessageReceiveJob.kt

@@ -17,8 +17,6 @@ class MessageReceiveJob(val data: ByteArray, val serverHash: String? = null, val
         val TAG = MessageReceiveJob::class.simpleName
         val KEY: String = "MessageReceiveJob"
 
-        private val RECEIVE_LOCK = Object()
-
         // Keys used for database storage
         private val DATA_KEY = "data"
         private val SERVER_HASH_KEY = "serverHash"
@@ -36,9 +34,7 @@ class MessageReceiveJob(val data: ByteArray, val serverHash: String? = null, val
             val isRetry: Boolean = failureCount != 0
             val (message, proto) = MessageReceiver.parse(this.data, this.openGroupMessageServerID)
             message.serverHash = serverHash
-            synchronized(RECEIVE_LOCK) { // FIXME: Do we need this?
+            MessageReceiver.handle(message, proto, this.openGroupID)
-                MessageReceiver.handle(message, proto, this.openGroupID)
-            }
             this.handleSuccess()
             deferred.resolve(Unit)
         } catch (e: Exception) {
@@ -82,11 +78,15 @@ class MessageReceiveJob(val data: ByteArray, val serverHash: String? = null, val
     class Factory: Job.Factory<MessageReceiveJob> {
 
         override fun create(data: Data): MessageReceiveJob {
+            val dataArray = data.getByteArray(DATA_KEY)
+            val serverHash = data.getStringOrDefault(SERVER_HASH_KEY, null)
+            val openGroupMessageServerID = data.getLongOrDefault(OPEN_GROUP_MESSAGE_SERVER_ID_KEY, -1).let { if (it == -1L) null else it }
+            val openGroupID = data.getStringOrDefault(OPEN_GROUP_ID_KEY, null)
             return MessageReceiveJob(
-                data.getByteArray(DATA_KEY),
+                dataArray,
-                data.getString(SERVER_HASH_KEY),
+                serverHash,
-                data.getLong(OPEN_GROUP_MESSAGE_SERVER_ID_KEY),
+                openGroupMessageServerID,
-                data.getString(OPEN_GROUP_ID_KEY)
+                openGroupID
             )
         }
     }

libsession/src/main/java/org/session/libsession/messaging/jobs/SessionJobManagerFactories.kt

@@ -11,7 +11,8 @@ class SessionJobManagerFactories {
                 MessageReceiveJob.KEY to MessageReceiveJob.Factory(),
                 MessageSendJob.KEY to MessageSendJob.Factory(),
                 NotifyPNServerJob.KEY to NotifyPNServerJob.Factory(),
-                TrimThreadJob.KEY to TrimThreadJob.Factory()
+                TrimThreadJob.KEY to TrimThreadJob.Factory(),
+                BatchMessageReceiveJob.KEY to BatchMessageReceiveJob.Factory()
             )
         }
     }

libsession/src/main/java/org/session/libsession/messaging/sending_receiving/pollers/OpenGroupPollerV2.kt

@@ -3,17 +3,12 @@ package org.session.libsession.messaging.sending_receiving.pollers
 import nl.komponents.kovenant.Promise
 import nl.komponents.kovenant.functional.map
 import org.session.libsession.messaging.MessagingModuleConfiguration
-import org.session.libsession.messaging.jobs.JobQueue
+import org.session.libsession.messaging.jobs.*
-import org.session.libsession.messaging.jobs.MessageReceiveJob
-import org.session.libsession.messaging.jobs.TrimThreadJob
 import org.session.libsession.messaging.open_groups.OpenGroupAPIV2
 import org.session.libsession.messaging.open_groups.OpenGroupMessageV2
-import org.session.libsession.messaging.sending_receiving.MessageReceiver
-import org.session.libsession.messaging.sending_receiving.handle
 import org.session.libsession.utilities.Address
 import org.session.libsession.utilities.GroupUtil
 import org.session.libsignal.protos.SignalServiceProtos
-import org.session.libsignal.utilities.Log
 import org.session.libsignal.utilities.successBackground
 import java.util.concurrent.ScheduledExecutorService
 import java.util.concurrent.ScheduledFuture
@@ -27,7 +22,7 @@ class OpenGroupPollerV2(private val server: String, private val executorService:
     private var future: ScheduledFuture<*>? = null
 
     companion object {
-        private val pollInterval: Long = 4 * 1000
+        private const val pollInterval: Long = 4000L
         const val maxInactivityPeriod = 14 * 24 * 60 * 60 * 1000
     }
 
@@ -66,21 +61,22 @@ class OpenGroupPollerV2(private val server: String, private val executorService:
         val threadId = storage.getThreadId(Address.fromSerialized(groupID)) ?: -1
         val threadExists = threadId >= 0
         if (!hasStarted || !threadExists) { return }
-        messages.sortedBy { it.serverID!! }.forEach { message ->
+        val envelopes = messages.sortedBy { it.serverID!! }.map { message ->
-            try {
+            val senderPublicKey = message.sender!!
-                val senderPublicKey = message.sender!!
+            val builder = SignalServiceProtos.Envelope.newBuilder()
-                val builder = SignalServiceProtos.Envelope.newBuilder()
+            builder.type = SignalServiceProtos.Envelope.Type.SESSION_MESSAGE
-                builder.type = SignalServiceProtos.Envelope.Type.SESSION_MESSAGE
+            builder.source = senderPublicKey
-                builder.source = senderPublicKey
+            builder.sourceDevice = 1
-                builder.sourceDevice = 1
+            builder.content = message.toProto().toByteString()
-                builder.content = message.toProto().toByteString()
+            builder.timestamp = message.sentTimestamp
-                builder.timestamp = message.sentTimestamp
+            builder.build() to message.serverID
-                val envelope = builder.build()
+        }
-                val (parsedMessage, content) = MessageReceiver.parse(envelope.toByteArray(), message.serverID)
+
-                MessageReceiver.handle(parsedMessage, content, openGroupID)
+        envelopes.chunked(20).forEach { list ->
-            } catch (e: Exception) {
+            val parameters = list.map { (message, serverId) ->
-                Log.e("Loki", "Exception parsing message", e)
+                MessageReceiveParameters(message.toByteArray(), openGroupMessageServerID = serverId)
             }
+            JobQueue.shared.add(BatchMessageReceiveJob(parameters, openGroupID))
         }
 
         val currentLastMessageServerID = storage.getLastMessageServerID(room, server) ?: 0
@@ -88,9 +84,6 @@ class OpenGroupPollerV2(private val server: String, private val executorService:
         if (actualMax > 0) {
             storage.setLastMessageServerID(room, server, actualMax)
         }
-        if (messages.isNotEmpty()) {
-            JobQueue.shared.add(TrimThreadJob(threadId))
-        }
     }
 
     private fun handleDeletedMessages(room: String, openGroupID: String, deletions: List<OpenGroupAPIV2.MessageDeletion>) {

libsession/src/main/java/org/session/libsession/messaging/sending_receiving/pollers/Poller.kt

@@ -3,12 +3,13 @@ package org.session.libsession.messaging.sending_receiving.pollers
 import nl.komponents.kovenant.*
 import nl.komponents.kovenant.functional.bind
 import org.session.libsession.messaging.MessagingModuleConfiguration
+import org.session.libsession.messaging.jobs.BatchMessageReceiveJob
 import org.session.libsession.messaging.jobs.JobQueue
-import org.session.libsession.messaging.jobs.MessageReceiveJob
+import org.session.libsession.messaging.jobs.MessageReceiveParameters
 import org.session.libsession.snode.SnodeAPI
 import org.session.libsession.snode.SnodeModule
-import org.session.libsignal.utilities.Snode
 import org.session.libsignal.utilities.Log
+import org.session.libsignal.utilities.Snode
 import java.security.SecureRandom
 import java.util.*
 
@@ -91,10 +92,14 @@ class Poller {
                 task { Unit } // The long polling connection has been canceled; don't recurse
             } else {
                 val messages = SnodeAPI.parseRawMessagesResponse(rawResponse, snode, userPublicKey)
-                messages.forEach { (envelope, serverHash) ->
+                val parameters = messages.map { (envelope, serverHash) ->
-                    val job = MessageReceiveJob(envelope.toByteArray(), serverHash)
+                    MessageReceiveParameters(envelope.toByteArray(), serverHash = serverHash)
+                }
+                parameters.chunked(20).forEach { chunk ->
+                    val job = BatchMessageReceiveJob(chunk)
                     JobQueue.shared.add(job)
                 }
+
                 poll(snode, deferred)
             }
         }

libsession/src/main/java/org/session/libsession/utilities/TextSecurePreferences.kt

@@ -363,7 +363,7 @@ object TextSecurePreferences {
 
     @JvmStatic
     fun getDirectCaptureCameraId(context: Context): Int {
-        return getIntegerPreference(context, DIRECT_CAPTURE_CAMERA_ID, Camera.CameraInfo.CAMERA_FACING_FRONT)
+        return getIntegerPreference(context, DIRECT_CAPTURE_CAMERA_ID, Camera.CameraInfo.CAMERA_FACING_BACK)
     }
 
     @JvmStatic

libsession/src/main/java/org/session/libsession/utilities/recipients/RecipientProvider.java

@@ -29,7 +29,6 @@ import org.session.libsession.utilities.Address;
 import org.session.libsession.utilities.GroupRecord;
 import org.session.libsession.utilities.ListenableFutureTask;
 import org.session.libsession.utilities.MaterialColor;
-import org.session.libsession.utilities.SoftHashMap;
 import org.session.libsession.utilities.TextSecurePreferences;
 import org.session.libsession.utilities.Util;
 import org.session.libsession.utilities.recipients.Recipient.RecipientSettings;
@@ -43,6 +42,7 @@ import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.Callable;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ExecutorService;
 
 class RecipientProvider {
@@ -222,17 +222,17 @@ class RecipientProvider {
 
   private static class RecipientCache {
 
-    private final Map<Address,Recipient> cache = new SoftHashMap<>(1000);
+    private final Map<Address,Recipient> cache = new ConcurrentHashMap<>(1000);
 
-    public synchronized Recipient get(Address address) {
+    public Recipient get(Address address) {
       return cache.get(address);
     }
 
-    public synchronized void set(Address address, Recipient recipient) {
+    public void set(Address address, Recipient recipient) {
       cache.put(address, recipient);
     }
 
-    public synchronized boolean remove(Address address) {
+    public boolean remove(Address address) {
       return cache.remove(address) != null;
     }
 

libsignal/protobuf/Makefile

@@ -1,3 +1,3 @@
 
 all:
-	protoc25 --java_out=../src/main/java/ SignalService.proto WebSocketResources.proto
+	protoc25 --java_out=../src/main/java/ SignalService.proto WebSocketResources.proto Utils.proto

libsignal/protobuf/Utils.proto

@@ -0,0 +1,10 @@
+syntax = "proto2";
+
+package signalservice;
+
+option java_package = "org.session.libsignal.protos";
+option java_outer_classname = "UtilProtos";
+
+message ByteArrayList {
+  repeated bytes content = 1;
+}

libsignal/src/main/java/org/session/libsignal/protos/UtilProtos.java

@@ -0,0 +1,512 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: Utils.proto
+
+package org.session.libsignal.protos;
+
+public final class UtilProtos {
+  private UtilProtos() {}
+  public static void registerAllExtensions(
+      com.google.protobuf.ExtensionRegistry registry) {
+  }
+  public interface ByteArrayListOrBuilder
+      extends com.google.protobuf.MessageOrBuilder {
+
+    // repeated bytes content = 1;
+    /**
+     * <code>repeated bytes content = 1;</code>
+     */
+    java.util.List<com.google.protobuf.ByteString> getContentList();
+    /**
+     * <code>repeated bytes content = 1;</code>
+     */
+    int getContentCount();
+    /**
+     * <code>repeated bytes content = 1;</code>
+     */
+    com.google.protobuf.ByteString getContent(int index);
+  }
+  /**
+   * Protobuf type {@code signalservice.ByteArrayList}
+   */
+  public static final class ByteArrayList extends
+      com.google.protobuf.GeneratedMessage
+      implements ByteArrayListOrBuilder {
+    // Use ByteArrayList.newBuilder() to construct.
+    private ByteArrayList(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
+      super(builder);
+      this.unknownFields = builder.getUnknownFields();
+    }
+    private ByteArrayList(boolean noInit) { this.unknownFields = com.google.protobuf.UnknownFieldSet.getDefaultInstance(); }
+
+    private static final ByteArrayList defaultInstance;
+    public static ByteArrayList getDefaultInstance() {
+      return defaultInstance;
+    }
+
+    public ByteArrayList getDefaultInstanceForType() {
+      return defaultInstance;
+    }
+
+    private final com.google.protobuf.UnknownFieldSet unknownFields;
+    @java.lang.Override
+    public final com.google.protobuf.UnknownFieldSet
+        getUnknownFields() {
+      return this.unknownFields;
+    }
+    private ByteArrayList(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      initFields();
+      int mutable_bitField0_ = 0;
+      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
+          com.google.protobuf.UnknownFieldSet.newBuilder();
+      try {
+        boolean done = false;
+        while (!done) {
+          int tag = input.readTag();
+          switch (tag) {
+            case 0:
+              done = true;
+              break;
+            default: {
+              if (!parseUnknownField(input, unknownFields,
+                                     extensionRegistry, tag)) {
+                done = true;
+              }
+              break;
+            }
+            case 10: {
+              if (!((mutable_bitField0_ & 0x00000001) == 0x00000001)) {
+                content_ = new java.util.ArrayList<com.google.protobuf.ByteString>();
+                mutable_bitField0_ |= 0x00000001;
+              }
+              content_.add(input.readBytes());
+              break;
+            }
+          }
+        }
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(this);
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(
+            e.getMessage()).setUnfinishedMessage(this);
+      } finally {
+        if (((mutable_bitField0_ & 0x00000001) == 0x00000001)) {
+          content_ = java.util.Collections.unmodifiableList(content_);
+        }
+        this.unknownFields = unknownFields.build();
+        makeExtensionsImmutable();
+      }
+    }
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.session.libsignal.protos.UtilProtos.internal_static_signalservice_ByteArrayList_descriptor;
+    }
+
+    protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.session.libsignal.protos.UtilProtos.internal_static_signalservice_ByteArrayList_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.session.libsignal.protos.UtilProtos.ByteArrayList.class, org.session.libsignal.protos.UtilProtos.ByteArrayList.Builder.class);
+    }
+
+    public static com.google.protobuf.Parser<ByteArrayList> PARSER =
+        new com.google.protobuf.AbstractParser<ByteArrayList>() {
+      public ByteArrayList parsePartialFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        return new ByteArrayList(input, extensionRegistry);
+      }
+    };
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<ByteArrayList> getParserForType() {
+      return PARSER;
+    }
+
+    // repeated bytes content = 1;
+    public static final int CONTENT_FIELD_NUMBER = 1;
+    private java.util.List<com.google.protobuf.ByteString> content_;
+    /**
+     * <code>repeated bytes content = 1;</code>
+     */
+    public java.util.List<com.google.protobuf.ByteString>
+        getContentList() {
+      return content_;
+    }
+    /**
+     * <code>repeated bytes content = 1;</code>
+     */
+    public int getContentCount() {
+      return content_.size();
+    }
+    /**
+     * <code>repeated bytes content = 1;</code>
+     */
+    public com.google.protobuf.ByteString getContent(int index) {
+      return content_.get(index);
+    }
+
+    private void initFields() {
+      content_ = java.util.Collections.emptyList();
+    }
+    private byte memoizedIsInitialized = -1;
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized != -1) return isInitialized == 1;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    public void writeTo(com.google.protobuf.CodedOutputStream output)
+                        throws java.io.IOException {
+      getSerializedSize();
+      for (int i = 0; i < content_.size(); i++) {
+        output.writeBytes(1, content_.get(i));
+      }
+      getUnknownFields().writeTo(output);
+    }
+
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