304 lines
7.2 KiB
Dart
304 lines
7.2 KiB
Dart
import 'dart:async';
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import 'dart:convert';
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import 'package:flutter/foundation.dart';
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// ======================== 枚举定义 ========================
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/// 轨迹模式枚举
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enum TPMode {
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NAVIGATION, // 导航模式: 绘制规划已完成路径和当前路径
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LOCATION, // 定位模式: 绘制当前点
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TRACK, // 轨迹模式: 实时绘制历史轨迹
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}
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/// 导航模式下的操作动作枚举
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enum TPAction {
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UPDATE, // 更新当前点
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ADD, // 添加完成点
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}
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// ======================== 尝试锁实现 ========================
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class TryLock {
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bool _locked = false;
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bool tryLock() {
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if (_locked) return false;
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_locked = true;
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return true;
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}
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void release() {
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_locked = false;
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}
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}
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// ======================== 环形队列实现 ========================
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class CircQueue<T> {
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final int capacity;
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final List<T?> buffer;
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int head = 0;
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int tail = 0;
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bool isFull = false;
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final bool deepCopy;
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final int maxMemoryBytes;
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int currentMemoryBytes = 0;
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CircQueue(this.capacity, {this.deepCopy = true, this.maxMemoryBytes = 1024 * 1024}) : buffer = List<T?>.filled(capacity, null);
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void clear() {
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head = tail;
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isFull = false;
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currentMemoryBytes = 0;
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}
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bool isEmpty() {
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return head == tail && !isFull;
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}
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bool isFullFn() {
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return isFull;
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}
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int _estimateSize(T item) {
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try {
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return utf8.encode(jsonEncode(item)).length;
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} catch (e) {
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return 0;
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}
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}
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T? _deepClone(T? item) {
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if (!deepCopy || item == null) return item;
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try {
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return jsonDecode(jsonEncode(item)) as T;
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} catch (e) {
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return item;
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}
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}
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bool enter(T item) {
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final itemSize = _estimateSize(item);
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if (isFullFn() || (currentMemoryBytes + itemSize > maxMemoryBytes)) {
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return false;
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}
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final clone = _deepClone(item);
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buffer[tail] = clone;
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tail = (tail + 1) % capacity;
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currentMemoryBytes += itemSize;
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if (tail == head) isFull = true;
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return true;
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}
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T? out() {
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if (isEmpty()) return null;
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final item = buffer[head];
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if (item != null) {
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currentMemoryBytes -= _estimateSize(item);
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}
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head = (head + 1) % capacity;
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isFull = false;
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return _deepClone(item);
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}
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bool discard(int len) {
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for (int i = 0; i < len; i++) {
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if (isEmpty()) return false;
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final index = (tail - 1 + capacity) % capacity;
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final item = buffer[index];
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if (item != null) {
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currentMemoryBytes -= _estimateSize(item);
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}
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tail = index;
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isFull = false;
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}
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return true;
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}
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int getDepth() {
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return isFull ? capacity : (tail + capacity - head) % capacity;
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}
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Future<bool> send(T item, {int timeoutMs = 0}) async {
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final start = DateTime.now().millisecondsSinceEpoch;
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while (!enter(item)) {
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if (timeoutMs > 0 && DateTime.now().millisecondsSinceEpoch - start >= timeoutMs) {
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return false;
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}
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await Future.delayed(const Duration(milliseconds: 1));
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}
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return true;
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}
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Future<T?> recv({int timeoutMs = 0}) async {
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final start = DateTime.now().millisecondsSinceEpoch;
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while (true) {
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final item = out();
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if (item != null) return item;
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if (timeoutMs > 0 && DateTime.now().millisecondsSinceEpoch - start >= timeoutMs) {
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return null;
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}
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await Future.delayed(const Duration(milliseconds: 1));
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}
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}
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List<T?> toList() {
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final result = <T?>[];
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int i = head;
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int count = getDepth();
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while (count-- > 0) {
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result.add(_deepClone(buffer[i]));
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i = (i + 1) % capacity;
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}
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return result;
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}
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}
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// ======================== 轨迹点核心类 ========================
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class TracePoint<T> {
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late final CircQueue<T> _queue;
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List<T> _tracePoint = [];
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int _completePointIndex = 0;
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late final TryLock _lock;
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TPMode _mode = TPMode.LOCATION;
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// 回调事件（对应JS原版emit）
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void Function(T)? onCurrentPointUpdated;
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void Function(T)? onCompletePointAdded;
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// 测试专用方法
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bool tryLock() => _lock.tryLock();
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void release() => _lock.release();
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TracePoint({int queueCapacity = 5, int maxMemoryBytes = 1024 * 1024}) {
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_queue = CircQueue<T>(queueCapacity, deepCopy: true, maxMemoryBytes: maxMemoryBytes);
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_lock = TryLock();
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reset();
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}
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/// 复位所有状态（和JS完全一致）
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void reset() {
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_queue.clear();
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_tracePoint.clear();
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_completePointIndex = 0;
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_lock.release();
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}
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/// 设置工作模式
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void setMode(TPMode mode) {
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reset();
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_mode = mode;
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}
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TPMode getMode() {
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return _mode;
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}
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/// 添加/更新点（核心API，和JS逻辑完全一致）
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void upsert(T point, [TPAction act = TPAction.UPDATE]) {
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if (point == null) {
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debugPrint('upsert: point is null');
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return;
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}
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switch (_mode) {
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case TPMode.NAVIGATION:
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if (act == TPAction.UPDATE) {
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_updateCurrentPoint(point);
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} else {
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_addCompletePoint(point);
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}
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break;
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case TPMode.LOCATION:
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_updateCurrentPoint(point);
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break;
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case TPMode.TRACK:
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_addCompletePoint(point);
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break;
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}
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}
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/// 获取轨迹列表（线程安全拷贝）
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List<T>? getTracePoint() {
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if (_lock.tryLock()) {
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final trace = List<T>.from(_tracePoint);
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_lock.release();
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return trace;
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} else {
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debugPrint('getTracePoint: lock!!!');
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return null;
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}
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}
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/// 更新当前点（导航/定位模式共用）
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void _updateCurrentPoint(T point) {
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if (!_lock.tryLock()) {
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debugPrint('updateCurrentPoint: lock!!!, discard current point');
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return;
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}
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try {
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switch (_mode) {
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case TPMode.NAVIGATION:
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if (_tracePoint.isEmpty) {
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debugPrint('updateCurrentPoint: wait first completed point, discard');
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} else {
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_tracePoint = _tracePoint.sublist(0, _completePointIndex);
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_tracePoint.add(point);
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onCurrentPointUpdated?.call(point);
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}
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break;
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case TPMode.LOCATION:
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_tracePoint = [point];
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onCurrentPointUpdated?.call(point);
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break;
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case TPMode.TRACK:
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break;
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}
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} finally {
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_lock.release();
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}
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}
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/// 添加完成点（导航/轨迹模式共用）
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void _addCompletePoint(T point) {
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if (_lock.tryLock()) {
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try {
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// 先处理队列积压
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while (!_queue.isEmpty()) {
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final queuedPoint = _queue.out();
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if (queuedPoint != null) {
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_addPoint(queuedPoint);
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}
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}
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_addPoint(point);
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onCompletePointAdded?.call(point);
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} catch (e) {
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debugPrint('addCompletePoint failure: $e');
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} finally {
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_lock.release();
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}
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} else {
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// 锁失败 → 入队列等待（JS原版核心逻辑）
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_queue.enter(point);
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debugPrint('addCompletePoint: lock!!!, enter queue');
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}
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}
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/// 内部真正执行添加点逻辑（和JS完全一致）
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void _addPoint(T point) {
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final hasCurrentPoint = _tracePoint.isNotEmpty && _completePointIndex < _tracePoint.length;
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if (hasCurrentPoint) {
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_tracePoint = _tracePoint.sublist(0, _completePointIndex);
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_tracePoint.insert(_completePointIndex, point);
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} else {
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_tracePoint.add(point);
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}
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_completePointIndex++;
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}
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}
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