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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License
     15  */
     16 
     17 package com.android.server.notification;
     18 
     19 
     20 /**
     21  * {@hide}
     22  */
     23 public class AlertRateLimiter {
     24     static final long ALLOWED_ALERT_INTERVAL = 1000;
     25     private long mLastNotificationMillis = 0;
     26 
     27    boolean shouldRateLimitAlert(long now) {
     28         final long millisSinceLast = now - mLastNotificationMillis;
     29         if (millisSinceLast < 0 || millisSinceLast < ALLOWED_ALERT_INTERVAL) {
     30             return true;
     31         }
     32         mLastNotificationMillis = now;
     33         return false;
     34     }
     35 }
     36