Bring back reconnect delay

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

@@ -89,6 +89,7 @@ import static android.os.Process.THREAD_PRIORITY_BACKGROUND;
 
 public class ServiceSynchronize extends ServiceBase implements SharedPreferences.OnSharedPreferenceChangeListener {
     private Boolean lastSuitable = null;
+    private long lastLost = 0;
     private int lastAccounts = 0;
     private int lastOperations = 0;
 
@@ -100,6 +101,7 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
     private static final int CONNECT_BACKOFF_START = 8; // seconds
     private static final int CONNECT_BACKOFF_MAX = 64; // seconds (totally 2 minutes)
     private static final int CONNECT_BACKOFF_AlARM = 15; // minutes
+    private static final long RECONNECT_BACKOFF = 90 * 1000L; // milliseconds
     private static final int ACCOUNT_ERROR_AFTER = 60; // minutes
     private static final int BACKOFF_ERROR_AFTER = 16; // seconds
 
@@ -280,6 +282,7 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
                         crumb.put("suitable", Boolean.toString(accountNetworkState.networkState.isSuitable()));
                         crumb.put("unmetered", Boolean.toString(accountNetworkState.networkState.isUnmetered()));
                         crumb.put("roaming", Boolean.toString(accountNetworkState.networkState.isRoaming()));
+                        crumb.put("lastLost", new Date(lastLost).toString());
                         Log.breadcrumb("start", crumb);
 
                         Log.i("### start=" + accountNetworkState);
@@ -304,6 +307,7 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
                         crumb.put("suitable", Boolean.toString(accountNetworkState.networkState.isSuitable()));
                         crumb.put("unmetered", Boolean.toString(accountNetworkState.networkState.isUnmetered()));
                         crumb.put("roaming", Boolean.toString(accountNetworkState.networkState.isRoaming()));
+                        crumb.put("lastLost", new Date(lastLost).toString());
                         Log.breadcrumb("stop", crumb);
 
                         Log.i("### stop=" + accountNetworkState);
@@ -584,6 +588,7 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
     }
 
     private void onReload(Intent intent) {
+        lastLost = 0;
         Bundle command = new Bundle();
         command.putString("name", "reload");
         command.putLong("account", intent.getLongExtra("account", -1));
@@ -712,6 +717,16 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
                     account.deleteNotificationChannel(ServiceSynchronize.this);
             }
 
+            long ago = new Date().getTime() - lastLost;
+            if (ago < RECONNECT_BACKOFF)
+                try {
+                    long backoff = RECONNECT_BACKOFF - ago;
+                    EntityLog.log(ServiceSynchronize.this, account.name + " backoff=" + (backoff / 1000));
+                    state.acquire(backoff);
+                } catch (InterruptedException ex) {
+                    Log.w(account.name + " backoff " + ex.toString());
+                }
+
             final DB db = DB.getInstance(this);
 
             state.setBackoff(CONNECT_BACKOFF_START);
@@ -1295,6 +1310,8 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
             ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
             NetworkInfo active = cm.getActiveNetworkInfo();
             EntityLog.log(ServiceSynchronize.this, "Lost network=" + network + " active=" + active);
+            if (active == null)
+                lastLost = new Date().getTime();
             updateState();
         }
 
@@ -1319,7 +1336,7 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
             if (Intent.ACTION_AIRPLANE_MODE_CHANGED.equals(intent.getAction())) {
                 boolean on = intent.getBooleanExtra("state", false);
                 if (!on)
-                    ;
+                    lastLost = 0;
             }
 
             networkCallback.onCapabilitiesChanged(null, null);