Limit conversation action duration

app/src/main/java/eu/faircode/email/TextHelper.java

@@ -24,12 +24,14 @@ import android.content.Context;
 import android.content.SharedPreferences;
 import android.icu.text.Transliterator;
 import android.os.Build;
+import android.os.SystemClock;
 import android.text.TextUtils;
 import android.view.textclassifier.ConversationAction;
 import android.view.textclassifier.ConversationActions;
 import android.view.textclassifier.TextClassificationManager;
 import android.view.textclassifier.TextClassifier;
 
+import androidx.annotation.RequiresApi;
 import androidx.preference.PreferenceManager;
 
 import java.time.ZoneId;
@@ -42,12 +44,21 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Locale;
 import java.util.Set;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
 
 public class TextHelper {
     private static final int MAX_DETECT_SAMPLE_SIZE = 8192;
     private static final float MIN_DETECT_PROBABILITY = 0.80f;
     private static final String TRANSLITERATOR = "Any-Latin; Latin-ASCII";
     private static final int MAX_CONVERSATION_SAMPLE_SIZE = 8192;
+    private static final long MAX_CONVERSATION_DURATION = 5000; // milliseconds
+
+    private static final ExecutorService executor =
+            Helper.getBackgroundExecutor(0, "text");
 
     static {
         System.loadLibrary("fairemail");
@@ -169,7 +180,31 @@ public class TextHelper {
                         .setHints(hints)
                         .build();
 
-        return tcm.getTextClassifier().suggestConversationActions(request);
+        Future<ConversationActions> future = executor.submit(new Callable<ConversationActions>() {
+            @Override
+            @RequiresApi(api = Build.VERSION_CODES.Q)
+            public ConversationActions call() throws Exception {
+                long start = SystemClock.elapsedRealtime();
+                try {
+                    return tcm.getTextClassifier().suggestConversationActions(request);
+                } finally {
+                    long elapse = SystemClock.elapsedRealtime() - start;
+                    Log.i("Conversation actions=" + elapse + " ms");
+                }
+            }
+        });
+
+        try {
+            return future.get(MAX_CONVERSATION_DURATION, TimeUnit.MILLISECONDS);
+        } catch (TimeoutException ex) {
+            Log.e(ex);
+            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+            prefs.edit().putBoolean("conversation_actions", false);
+            return null;
+        } catch (Throwable ex) {
+            Log.e(ex);
+            return null;
+        }
     }
 
     private static class DetectResult {