Warm up LiveRecipientCache at launch.

src/org/thoughtcrime/securesms/ApplicationContext.java

@@ -146,6 +146,7 @@ public class ApplicationContext extends MultiDexApplication implements DefaultLi
   public void onStart(@NonNull LifecycleOwner owner) {
     isAppVisible = true;
     Log.i(TAG, "App is now visible.");
+    ApplicationDependencies.getRecipientCache().warmUp();
     executePendingContactSync();
     KeyCachingService.onAppForegrounded(this);
   }

src/org/thoughtcrime/securesms/recipients/LiveRecipient.java

@@ -125,8 +125,6 @@ public final class LiveRecipient {
 
     if (Util.isMainThread()) {
       Log.w(TAG, "[Resolve][MAIN] " + getId(), new Throwable());
-    } else {
-      Log.d(TAG, "[Resolve][" + Thread.currentThread().getName() + "] " + getId());
     }
 
     Recipient       updated      = fetchRecipientFromDisk(getId());
@@ -154,8 +152,6 @@ public final class LiveRecipient {
 
     if (Util.isMainThread()) {
       Log.w(TAG, "[Refresh][MAIN] " + getId(), new Throwable());
-    } else {
-      Log.d(TAG, "[Refresh][" + Thread.currentThread().getName() + "] " + getId());
     }
 
     Recipient       recipient    = fetchRecipientFromDisk(getId());

src/org/thoughtcrime/securesms/recipients/LiveRecipientCache.java

@@ -2,23 +2,37 @@ package org.thoughtcrime.securesms.recipients;
 
 import android.annotation.SuppressLint;
 import android.content.Context;
+import android.database.Cursor;
 
 import androidx.annotation.AnyThread;
 import androidx.annotation.NonNull;
 import androidx.annotation.WorkerThread;
 import androidx.lifecycle.MutableLiveData;
 
+import com.annimon.stream.Stream;
+
 import org.thoughtcrime.securesms.database.DatabaseFactory;
 import org.thoughtcrime.securesms.database.RecipientDatabase;
 import org.thoughtcrime.securesms.database.RecipientDatabase.MissingRecipientError;
+import org.thoughtcrime.securesms.database.ThreadDatabase;
+import org.thoughtcrime.securesms.database.model.ThreadRecord;
+import org.thoughtcrime.securesms.logging.Log;
 import org.thoughtcrime.securesms.util.LRUCache;
 import org.thoughtcrime.securesms.util.TextSecurePreferences;
 import org.thoughtcrime.securesms.util.concurrent.SignalExecutors;
 
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
 import java.util.Map;
 
 public final class LiveRecipientCache {
 
+  private static final String TAG = Log.tag(LiveRecipientCache.class);
+
+  private static final int CACHE_MAX      = 1000;
+  private static final int CACHE_WARM_MAX = 500;
 
   private final Context                         context;
   private final RecipientDatabase               recipientDatabase;
@@ -26,12 +40,13 @@ public final class LiveRecipientCache {
   private final LiveRecipient                   unknown;
 
   private RecipientId localRecipientId;
+  private boolean     warmedUp;
 
   @SuppressLint("UseSparseArrays")
   public LiveRecipientCache(@NonNull Context context) {
     this.context           = context.getApplicationContext();
     this.recipientDatabase = DatabaseFactory.getRecipientDatabase(context);
-    this.recipients        = new LRUCache<>(1000);
+    this.recipients        = new LRUCache<>(CACHE_MAX);
     this.unknown           = new LiveRecipient(context, new MutableLiveData<>(), Recipient.UNKNOWN);
   }
 
@@ -71,4 +86,33 @@ public final class LiveRecipientCache {
 
     return getLive(localRecipientId).resolve();
   }
+
+  @AnyThread
+  public synchronized void warmUp() {
+    if (warmedUp) {
+      return;
+    } else {
+      warmedUp = true;
+    }
+
+    SignalExecutors.BOUNDED.execute(() -> {
+      ThreadDatabase threadDatabase = DatabaseFactory.getThreadDatabase(context);
+
+      try (ThreadDatabase.Reader reader = threadDatabase.readerFor(threadDatabase.getConversationList())) {
+        int             i          = 0;
+        ThreadRecord    record     = null;
+        List<Recipient> recipients = new ArrayList<>();
+
+        while ((record = reader.getNext()) != null && i < CACHE_WARM_MAX) {
+          recipients.add(record.getRecipient());
+          i++;
+        }
+
+        Log.d(TAG, "Warming up " + recipients.size() + " recipients.");
+
+        Collections.reverse(recipients);
+        Stream.of(recipients).map(Recipient::getId).forEach(this::getLive);
+      }
+    });
+  }
 }