103 lines
2.8 KiB
Markdown
103 lines
2.8 KiB
Markdown
# 线程安全map
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## 概述
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### 简介
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提供了一个线程安全的map实现。SafeMap在STL map基础上封装互斥锁，以确保对map的操作安全。
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## 涉及功能
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### class SafeMap
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#### 接口说明
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|返回类型 |名称 |
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| -------------- | -------------- |
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| | **SafeMap**() |
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| | **SafeMap**(const SafeMap& rhs) |
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| | **~SafeMap**() |
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| void | **Clear**()<br>删除map中存储的所有键值对。 |
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| void | **EnsureInsert**(const K& key, const V& value)<br>在map中插入元素。 |
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| void | **Erase**(const K& key)<br>删除map中键为key的键值对。 |
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| bool | **Find**(const K& key, V& value)<br>在map中查找元素。 |
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| bool | **FindOldAndSetNew**(const K& key, V& oldValue, const V& newValue)<br>在map中查找元素并将key对应的`oldValue`替换为`newValue`。 |
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| bool | **Insert**(const K& key, const V& value)<br>在map中插入新元素。 |
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| bool | **IsEmpty**()<br>判断map是否为空。 |
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| void | **Iterate**(const SafeMapCallBack& callback)<br>遍历map中的元素。 |
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| SafeMap& | **operator=**(const SafeMap& rhs) |
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| V& | **operator[]**(const K& key) |
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| int | **Size**()<br>获取map的size大小。 |
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## 使用示例
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1. 示例代码(伪代码)
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```c++
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#include <thread>
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#include <iostream>
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#include <functional>
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#include "../include/safe_map.h"
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using namespace OHOS;
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using namespace std;
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constexpr int THREAD_NUM = 5;
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thread threads[THREAD_NUM * 2];
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SafeMap<int, string> sm;
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bool InsertHandler(const int& key, const string& value)
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{
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if (sm.Insert(key,value)) {
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cout << "Insert key: " << key << endl;
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return true;
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} else {
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return false;
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}
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}
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bool FindHandler(const int& key, string& value)
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{
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if (sm.Find(key,value)) {
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cout << "Find key: " << key << " with value: " << value << endl;
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return true;
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} else {
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return false;
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}
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}
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int main()
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{
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for (int i = 0; i < THREAD_NUM; i++) {
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string name = "Thread" + to_string(i);
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threads[i] = thread(&InsertHandler, i, name);
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}
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for (int i = 0; i < THREAD_NUM; i++) {
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string out;
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threads[i + THREAD_NUM] = thread(&FindHandler, i, ref(out));
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}
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this_thread::sleep_for(chrono::milliseconds(300));
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for (int i = 0; i < 2 * THREAD_NUM; i++) {
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threads[i].join();
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}
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if (sm.Size() == THREAD_NUM) {
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cout << "Insert to SafeMap success!" << endl;
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}
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}
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```
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2. 测试用例编译运行方法
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- 测试用例代码参见base/test/unittest/common/utils_safe_map_test.cpp
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- 使用开发者自测试框架，使用方法参见：[开发自测试执行框架-测试用例执行](https://gitee.com/openharmony/testfwk_developer_test#%E6%B5%8B%E8%AF%95%E7%94%A8%E4%BE%8B%E6%89%A7%E8%A1%8C)
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- 使用以下具体命令以运行`safe_map.h`对应测试用例
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```bash
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run -t UT -tp utils -ts UtilsSafeMapTest
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``` |