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