数据存储封装—支持内存和本地缓存

公司这几天底层进行重构，本地需要缓存一些数据，对比目前一些比较火的三方，最终决定选用Objective-LevelDB。Objective-LevelDB，是一个基于Google's LevelDB的Objective-C数据库。然后对其进行了简单封装，支持内存和本地缓存，废话少说，直接用法。

支持pod, pod ‘Objective-LevelDB’

源码git地址https://github.com/matehat/Objective-LevelDB

下面是.h封装

#import <Foundation/Foundation.h>

/**
*  存储服务  基于Objective-LevelDB
*/

@interface FlyStorageManage : NSObject

/*
*  存储对象到内存
*
*  @parm object 对象
*  @parm akey   key
*/
+ (void)setObjectToMemory:(id)object forKey:(NSString *)akey;

/**
*  内存中读取某个对象
*
*  @parm akey key
*
*  @return
*/
+ (id)objectFromMemoryForkey:(NSString *)akey;

/**
*  从内存中移除某个对象
*
*  @parm akey key
*/
+ (void)removeObjectFromMemoryForKey:(NSString *)akey;

/**
*  存储对象到本地缓存
*
*  @parm object 对象 对象需要实现NSCoding序列化
*  也可配合MJExtension／JsonModel转换成字典存储　
*  @parm akey   key
*/
+ (void)setObjectToLocalCache:(id)object forKey:(NSString *)akey;

/**
*  从本地缓存中读取某个对象
*
*  @parm akey key
*
*  @return
*/
+ (id)objectFromLocalCacheForkey:(NSString *)akey;

/**
*  从本地缓存中移除某个对象
*
*  @parm akey key
*/
+ (void)removeObjectFromLocalCacheForKey:(NSString *)akey;

@end

然后是.m的实现

#import "FlyStorageManage.h"
#import "Objective-LevelDB/Classes/LevelDB.h"

@interface FlyStorageManage ()

@property (nonatomic, strong) NSMutableDictionary *memoryServiceDict;
@property (nonatomic, strong) LevelDB             *levelDB;

@end

static NSString *const kLevelDBName                = @"level.db";
@implementation FlyStorageManage

+ (FlyStorageManage *)shareInstance
{
static dispatch_once_t onceToken;
static FlyStorageManage *service = nil;

dispatch_once(&onceToken, ^{

service = [[FlyStorageManage alloc] init];
});
return service;
}

- (instancetype)init
{
if (self = [super init]) {

self.memoryServiceDict = [[NSMutableDictionary alloc] init];
self.levelDB           = [LevelDB databaseInLibraryWithName:kLevelDBName];

self.levelDB.encoder   = ^NSData * (LevelDBKey * key, id object) {

__block id result = nil;
result = [NSKeyedArchiver archivedDataWithRootObject:object];
return result;
};

self.levelDB.decoder   = ^id (LevelDBKey * key, id data) {

__block id result = nil;
result = [NSKeyedUnarchiver unarchiveObjectWithData:data];
return result;
};
}
return self;
}

#pragma mark --- MemoryService
+ (void)setObjectToMemory:(id)object forKey:(NSString *)akey
{
// 线程安全
@synchronized (self) {

if (object && akey) {
[[self shareInstance].memoryServiceDict setObject:object forKey:akey];
}
}
}

+ (id)objectFromMemoryForkey:(NSString *)akey
{
@synchronized (self) {
return [[self shareInstance].memoryServiceDict objectForKey:akey];
}
}

+ (void)removeObjectFromMemoryForKey:(NSString *)akey
{
@synchronized (self) {
[[self shareInstance].memoryServiceDict removeObjectForKey:akey];
}
}

#pragma mark --- LocalCacheService
+ (void)setObjectToLocalCache:(id)object forKey:(NSString *)akey
{
[[FlyStorageManage shareInstance].levelDB setObject:object forKey:akey];
}

+ (id)objectFromLocalCacheForkey:(NSString *)akey
{
return [[FlyStorageManage shareInstance].levelDB objectForKey:akey];
}

+ (void)removeObjectFromLocalCacheForKey:(NSString *)akey
{
[[FlyStorageManage shareInstance].levelDB removeObjectForKey:akey];
}

@end

下面是调用部分 (嫌序列化太麻烦，所以调用了MJ大大的MJExtension转换成字典进行存储)

- (void)viewDidLoad {
[super viewDidLoad];

Person *person = [[Person alloc] init];
person.name    = @"测试下";
person.age     = @"18";
person.height  = 14;
person.textArr = [NSMutableArray arrayWithObjects:@"1",@"2",@"3",@"4",@"5",nil];

NSString *personKey   =  @"testKey";

NSDictionary *perDic = person.mj_keyValues;

[FlyStorageManage setObjectToLocalCache:perDic forKey:personKey];

NSDictionary *dic = [CBStorageService objectFromLocalCacheForKey:personKey];

}

是不是很方便简单，有需要的朋友可以直接拿去用了