services/core/java/com/android/server/notification/AlertRateLimiter.java

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License
 */

package com.android.server.notification;


/**
 * {@hide}
 */
public class AlertRateLimiter {
    static final long ALLOWED_ALERT_INTERVAL = 1000;
    private long mLastNotificationMillis = 0;

   boolean shouldRateLimitAlert(long now) {
        final long millisSinceLast = now - mLastNotificationMillis;
        if (millisSinceLast < 0 || millisSinceLast < ALLOWED_ALERT_INTERVAL) {
            return true;
        }
        mLastNotificationMillis = now;
        return false;
    }
}