1f621416f7455b46c88400d994e51f9494f82410eEnrico Granata/* 2f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * Copyright (C) 2017 The Android Open Source Project 3f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * 4f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * Licensed under the Apache License, Version 2.0 (the "License"); 5f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * you may not use this file except in compliance with the License. 6f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * You may obtain a copy of the License at 7f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * 8f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * http://www.apache.org/licenses/LICENSE-2.0 9f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * 10f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * Unless required by applicable law or agreed to in writing, software 11f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * distributed under the License is distributed on an "AS IS" BASIS, 12f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * See the License for the specific language governing permissions and 14f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * limitations under the License. 15f621416f7455b46c88400d994e51f9494f82410eEnrico Granata */ 16f621416f7455b46c88400d994e51f9494f82410eEnrico Granata 17f621416f7455b46c88400d994e51f9494f82410eEnrico Granatapackage com.android.car.internal; 18f621416f7455b46c88400d994e51f9494f82410eEnrico Granata 19678064a8f745ac89c2d3a5c48e09d1c10eb35deaPavel Maltsevimport java.util.Collection; 20f621416f7455b46c88400d994e51f9494f82410eEnrico Granataimport java.util.Collections; 21f621416f7455b46c88400d994e51f9494f82410eEnrico Granataimport java.util.HashMap; 22f621416f7455b46c88400d994e51f9494f82410eEnrico Granataimport java.util.Map; 23f621416f7455b46c88400d994e51f9494f82410eEnrico Granata 24f621416f7455b46c88400d994e51f9494f82410eEnrico Granata/** 25f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * Represent listeners for a sensor grouped by their rate. 26f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * @hide 27f621416f7455b46c88400d994e51f9494f82410eEnrico Granata */ 28f621416f7455b46c88400d994e51f9494f82410eEnrico Granatapublic class CarRatedListeners<EventListenerType> { 29678064a8f745ac89c2d3a5c48e09d1c10eb35deaPavel Maltsev private final Map<EventListenerType, Integer> mListenersToRate = new HashMap<>(4); 30678064a8f745ac89c2d3a5c48e09d1c10eb35deaPavel Maltsev 31f621416f7455b46c88400d994e51f9494f82410eEnrico Granata private int mUpdateRate; 32f621416f7455b46c88400d994e51f9494f82410eEnrico Granata 33f621416f7455b46c88400d994e51f9494f82410eEnrico Granata protected long mLastUpdateTime = -1; 34f621416f7455b46c88400d994e51f9494f82410eEnrico Granata 35f621416f7455b46c88400d994e51f9494f82410eEnrico Granata protected CarRatedListeners(int rate) { 36f621416f7455b46c88400d994e51f9494f82410eEnrico Granata mUpdateRate = rate; 37f621416f7455b46c88400d994e51f9494f82410eEnrico Granata } 38f621416f7455b46c88400d994e51f9494f82410eEnrico Granata 39f621416f7455b46c88400d994e51f9494f82410eEnrico Granata public boolean contains(EventListenerType listener) { 40f621416f7455b46c88400d994e51f9494f82410eEnrico Granata return mListenersToRate.containsKey(listener); 41f621416f7455b46c88400d994e51f9494f82410eEnrico Granata } 42f621416f7455b46c88400d994e51f9494f82410eEnrico Granata 43f621416f7455b46c88400d994e51f9494f82410eEnrico Granata public int getRate() { 44f621416f7455b46c88400d994e51f9494f82410eEnrico Granata return mUpdateRate; 45f621416f7455b46c88400d994e51f9494f82410eEnrico Granata } 46f621416f7455b46c88400d994e51f9494f82410eEnrico Granata 47f621416f7455b46c88400d994e51f9494f82410eEnrico Granata /** 48f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * Remove given listener from the list and update rate if necessary. 49f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * 50f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * @param listener 51f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * @return true if rate was updated. Otherwise, returns false. 52f621416f7455b46c88400d994e51f9494f82410eEnrico Granata */ 53f621416f7455b46c88400d994e51f9494f82410eEnrico Granata public boolean remove(EventListenerType listener) { 54f621416f7455b46c88400d994e51f9494f82410eEnrico Granata mListenersToRate.remove(listener); 55f621416f7455b46c88400d994e51f9494f82410eEnrico Granata if (mListenersToRate.isEmpty()) { 56f621416f7455b46c88400d994e51f9494f82410eEnrico Granata return false; 57f621416f7455b46c88400d994e51f9494f82410eEnrico Granata } 58f621416f7455b46c88400d994e51f9494f82410eEnrico Granata Integer updateRate = Collections.min(mListenersToRate.values()); 59f621416f7455b46c88400d994e51f9494f82410eEnrico Granata if (updateRate != mUpdateRate) { 60f621416f7455b46c88400d994e51f9494f82410eEnrico Granata mUpdateRate = updateRate; 61f621416f7455b46c88400d994e51f9494f82410eEnrico Granata return true; 62f621416f7455b46c88400d994e51f9494f82410eEnrico Granata } 63f621416f7455b46c88400d994e51f9494f82410eEnrico Granata return false; 64f621416f7455b46c88400d994e51f9494f82410eEnrico Granata } 65f621416f7455b46c88400d994e51f9494f82410eEnrico Granata 66f621416f7455b46c88400d994e51f9494f82410eEnrico Granata public boolean isEmpty() { 67f621416f7455b46c88400d994e51f9494f82410eEnrico Granata return mListenersToRate.isEmpty(); 68f621416f7455b46c88400d994e51f9494f82410eEnrico Granata } 69f621416f7455b46c88400d994e51f9494f82410eEnrico Granata 70f621416f7455b46c88400d994e51f9494f82410eEnrico Granata /** 71f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * Add given listener to the list and update rate if necessary. 72f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * 73f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * @param listener if null, add part is skipped. 74f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * @param updateRate 75f621416f7455b46c88400d994e51f9494f82410eEnrico Granata * @return true if rate was updated. Otherwise, returns false. 76f621416f7455b46c88400d994e51f9494f82410eEnrico Granata */ 77f621416f7455b46c88400d994e51f9494f82410eEnrico Granata public boolean addAndUpdateRate(EventListenerType listener, int updateRate) { 78f621416f7455b46c88400d994e51f9494f82410eEnrico Granata Integer oldUpdateRate = mListenersToRate.put(listener, updateRate); 79f621416f7455b46c88400d994e51f9494f82410eEnrico Granata if (mUpdateRate > updateRate) { 80f621416f7455b46c88400d994e51f9494f82410eEnrico Granata mUpdateRate = updateRate; 81f621416f7455b46c88400d994e51f9494f82410eEnrico Granata return true; 82f621416f7455b46c88400d994e51f9494f82410eEnrico Granata } else if (oldUpdateRate != null && oldUpdateRate == mUpdateRate) { 83f621416f7455b46c88400d994e51f9494f82410eEnrico Granata mUpdateRate = Collections.min(mListenersToRate.values()); 84f621416f7455b46c88400d994e51f9494f82410eEnrico Granata } 85f621416f7455b46c88400d994e51f9494f82410eEnrico Granata return false; 86f621416f7455b46c88400d994e51f9494f82410eEnrico Granata } 87f621416f7455b46c88400d994e51f9494f82410eEnrico Granata 88678064a8f745ac89c2d3a5c48e09d1c10eb35deaPavel Maltsev public Collection<EventListenerType> getListeners() { 89f621416f7455b46c88400d994e51f9494f82410eEnrico Granata return mListenersToRate.keySet(); 90f621416f7455b46c88400d994e51f9494f82410eEnrico Granata } 91f621416f7455b46c88400d994e51f9494f82410eEnrico Granata} 92