Cache identities for contact info update

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

@@ -94,6 +94,7 @@ public class ContactInfo {
     private static Map<String, Lookup> emailLookup = new ConcurrentHashMap<>();
     private static final Map<String, ContactInfo> emailContactInfo = new HashMap<>();
     private static final Map<String, Avatar> emailGravatar = new HashMap<>();
+    private static final Map<Long, List<EntityIdentity>> accountIdentities = new HashMap<>();
 
     private static final ExecutorService executorLookup =
             Helper.getBackgroundExecutor(1, "contact");
@@ -193,6 +194,12 @@ public class ContactInfo {
         });
     }
 
+    static void clearIdentities() {
+        synchronized (accountIdentities) {
+            accountIdentities.clear();
+        }
+    }
+
     @NonNull
     static ContactInfo[] get(Context context, long account, String folderType, Address[] addresses) {
         return get(context, account, folderType, addresses, false);
@@ -750,7 +757,14 @@ public class ContactInfo {
         // Check if from self
         if (type == EntityContact.TYPE_FROM) {
             if (message.from != null) {
-                List<EntityIdentity> identities = db.identity().getSynchronizingIdentities(folder.account);
+                List<EntityIdentity> identities;
+                synchronized (accountIdentities) {
+                    if (!accountIdentities.containsKey(folder.account))
+                        accountIdentities.put(folder.account,
+                                db.identity().getSynchronizingIdentities(folder.account));
+                    identities = accountIdentities.get(folder.account);
+                }
+
                 if (identities != null) {
                     for (Address sender : message.from) {
                         for (EntityIdentity identity : identities)

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

@@ -990,6 +990,8 @@ public class FragmentIdentity extends FragmentBase {
                     db.endTransaction();
                 }
 
+                ContactInfo.clearIdentities();
+
                 return false;
             }
 
@@ -1374,6 +1376,8 @@ public class FragmentIdentity extends FragmentBase {
                 DB db = DB.getInstance(context);
                 db.identity().deleteIdentity(id);
 
+                ContactInfo.clearIdentities();
+
                 return null;
             }