| /* |
| * Copyright (C) 2020 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.location.gnss; |
| |
| /** |
| * A simple implementation of exponential backoff. |
| */ |
| class ExponentialBackOff { |
| private static final int MULTIPLIER = 2; |
| private final long mInitIntervalMillis; |
| private final long mMaxIntervalMillis; |
| private long mCurrentIntervalMillis; |
| |
| ExponentialBackOff(long initIntervalMillis, long maxIntervalMillis) { |
| mInitIntervalMillis = initIntervalMillis; |
| mMaxIntervalMillis = maxIntervalMillis; |
| |
| mCurrentIntervalMillis = mInitIntervalMillis / MULTIPLIER; |
| } |
| |
| long nextBackoffMillis() { |
| if (mCurrentIntervalMillis > mMaxIntervalMillis) { |
| return mMaxIntervalMillis; |
| } |
| |
| mCurrentIntervalMillis *= MULTIPLIER; |
| return mCurrentIntervalMillis; |
| } |
| |
| void reset() { |
| mCurrentIntervalMillis = mInitIntervalMillis / MULTIPLIER; |
| } |
| |
| @Override |
| public String toString() { |
| return "ExponentialBackOff{" |
| + "mInitIntervalMillis=" + mInitIntervalMillis |
| + ", mMaxIntervalMillis=" + mMaxIntervalMillis |
| + ", mCurrentIntervalMillis=" + mCurrentIntervalMillis |
| + '}'; |
| } |
| } |
| |