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  • Paging

    千次阅读 2018-04-24 14:09:51
    Paging库是用来代替在ListView中查询的CursorAdapter和在RecyclerView中查询的AsyncListUtil的。 Paging库的主要组成: DataSource:定义数据来源,可以根据实际情况继承其子类: PageKeyedDataSource:使用当前...

    Paging库是用来代替在ListView中查询的CursorAdapter和在RecyclerView中查询的AsyncListUtil的。

    Paging库的主要组成:

    • DataSource:定义数据来源,可以根据实际情况继承其子类:
      • PageKeyedDataSource:使用当前Page保存的前后key来查找数据,例如使用当前保存的nextPage token。
      • ItemKeyedDataSource:使用当前项的数据获取下一项的数据,例如嵌套评论,使用前一项的id获取下一项的数据。
      • PositionalDataSource:从数据来源的任意点获取任意个数的数据。

    Paging库可以搭配Room库使用,Room库可以帮我们自动生成能够获取PositionalDataSource实例的DataSource.Factory,例如:

    @Query("select * from users WHERE age > :age order by name DESC, id ASC")
    DataSource.Factory<Integer, User> usersOlderThan(int age);
    • PagedList:从DataSource中加载数据,可以设置一次加载多少数据,预加载多少数据。同时这个类也可以为其他类提醒更新,例如RecyclerView.Adapter

    • PagedListAdapter:这是一个RecyclerView.Adapter的实现类,用来从PagedList中获取数据。当加载了新页时,PagedListAdapter可以提醒RecyclerView进行更新。PagedListAdapter使用子线程进行新旧页数据的对比,提高效率。

    • 实时更新:传入DataSource.Factory,生成对应的LiveData或者Flowable实现自动更新:

      • LivePagedListBuilder

        LiveData<PagedList<Item>> pagedItems =
            LivePagedListBuilder(myDataSource, /* page size */ 50)
                    .setFetchExecutor(myNetworkExecutor)
                    .build();
      • RxPagedListBuilder

        Flowable<PagedList<Item>> pagedItems =
            RxPagedListBuilder(myDataSource, /* page size */ 50)
                    .setFetchScheduler(myNetworkScheduler)
                    .buildFlowable(BackpressureStrategy.LATEST);
    展开全文
  • paging

    2010-09-12 23:51:00
    If paging is not used, the linear address space of the processor is mapped directly into the physical address space of processor. The physical address space is defined as the range of ...

    If paging is not used, the linear address space of the processor is mapped directly

    into the physical address space of processor. The physical address space is defined as
    the range of addresses that the processor can generate on its address bus.

     

    如果不使用分页机制,处理器的物理地址直接映射成处理器的线性地址空间。这里的物理地址空间指的就

    是处理器地址线可以产生的地址序列。(什么要有线性空间 物理空间 逻辑地址 什么的呢 硬件设计兼容问题吧不知道 8086—386没办法)
    Because multitasking computing systems commonly define a linear address space
    much larger than it is economically feasible to contain all at once in physical memory,
    some method of “virtualizing” the linear address space is needed. This virtualization
    of the linear address space is handled through the processor’s paging mechanism.

    因为多计算任务系统通常定义一个线性空间(。。。。。不会翻译我理解是不是数据总线可以寻址的大小 比实际上的内存大小大的多吧 )所以一些讲线性地址虚拟话的方法就是必须的了(指的是逻辑上的?)那么这种虚拟化线性地址空间就是通过分页机制处理的。

    突然想个问题 分段和分页机制是怎么实现的 是不是靠处理器的硬件 ?我感觉肯定需要软件的支持。回头问问。!!!!!!
    Paging supports a “virtual memory” environment where a large linear address space
    is simulated with a small amount of physical memory (RAM and ROM) and some diskstorage.

     When using paging, each segment is divided into pages (typically 4 KBytes each in size),

    which are stored either in physical memory or on the disk. The operating system or

    executive maintains a page directory and a set of page tables to keep track of the pages.

     When a program (or task) attempts to access an address location

     

    in the linear address space, the processor uses the page directory and page tables to
    translate the linear address into a physical address and then performs the requested
    operation (read or write) on the memory location.

    分页支持 虚拟的内存环境当上面说的比较大的线性地址模拟小的物理内还有一些硬盘存储空间。当使用分页

    机制的时候 每个段都被分成了页(通常每个页4千字节)他们存在物理内存或是磁盘上。(每个段分成页

    段一定是4千的倍数吗  哦 突然想起来 这个分页 分段 和 处理器的模式 是不是有关系啊???????????)操作系统或是可执行的程序

    维护一个页的目录和一组页索引表格当一个程序或任务试图进入一个地址位置。(好像这就是分页机制的软件吧 可能把

    然后处理器就会用上面的目录和索引把那个线性地址翻译成物理地址同时执行在内存上的地址位置
    If the page being accessed is not currently in physical memory, the processor interrupts
    execution of the program (by generating a page-fault exception). The operating
    system or executive then reads the page into physical memory from the disk
    and continues executing the program.

    (看会电视)如果目前页不是在物理内存中存取(有点糊涂不知道怎么回事 好像应该是页不在内存中的意思)。处理器就会中断程序的执行由页默认异常。操作系统会把他加载到内存中 然后执行。


    When paging is implemented properly in the operating-system or executive, the
    swapping of pages between physical memory and the disk is transparent to the
    correct execution of a program. Even programs written for 16-bit IA-32 processors
    can be paged (transparently) when they are run in virtual-8086 mode.

    当分页生效在操作系统中时,分页们转换在内存和磁盘之间是透明的对于一个程序的执行这句读不懂

    展开全文
  • Jetpack之Paging学习

    2020-06-11 20:16:43
    Paging

    Paging

    展开全文
  • paging wikipedia In computer operating systems, paging is a memory management scheme by which a computer stores and retrieves data from secondary storage for use in main memory. In this shceme, the ...
    • paging

      wikipedia

      In computer operating systems, paging is a memory management scheme by which a computer stores and retrieves data from secondary storage for use in main memory.

      In this shceme, the operating system retrieves data from secondary storage in same-size blocks called pages.

      Paging is an important part of virual memory implementations in modern operating systems, using secondary storage to let programs exceed the size of available physical memory.

      main memory is called “RAM”(an acronym of “random - access memory”) and secondary storage is called “disk” (a shorthand for “hard disk drive, drum memory or solid-state drive”)

    • pages

      pages became the units exchanged between disk and RAM.

      A page, memory page, or virtual page is a fixed-length contiguous block of virtual memory, described by a single entry in the page table.

      It is the smallest unit of data for mamory management in a virtual memory operating system.

      Similarly, a page frame is the smallest fixed-length contiguous block of physical memory into which memory pages are mapped by the operating system.

      A transfer of pages between main memory and an auxiliary store, such as a hard disk drive, is reffered to as paging or swapping.

    • Page replacement techniques

      from paging, page replacement techniques:

      1. demand paging

        Refered from wikipedia, demand paging (as opposed to anticipatory paging) is a method of virtual memory management.

        The OS copies a disk page into physical memory only if an attempt is made to access it and that page is not already in memory.

        It is an example of a lazy loading technique.

      2. anticipatory paging

        Also called swap prefetch, predicts which pages will be references soon, to minimize future page faults.

      3. free page queue, stealing, and reclamation
      4. pre-cleaning
    • 前情回顾

      从上文可见,想要理解paging,需要先理解:

      • 《理解Linux中secondary storage》
      • 《理解Linux中virtual memory 》
      • 《理解Computer中Address space\MMU\PTE\TLB\Page table\Page out》
    • 其他主题

    展开全文
  • Paging missing

    2020-12-02 00:09:01
    <p>Paging missing in these places. Paging should be like present in Clients, Groups etc, so, that user doesn't have to scroll and scroll. <ul><li>[ ] Loan Products</li><li>[ ] Savings Products...
  • paging 原生JS写的一个很轻量级很简单的分页组件 页码显示逻辑比较友好 嗯 是写的一个栗子 所以 木有多少复杂配置 (๑•̀ㅂ•́) ✧ 演示 用法 /** * 初始化 * onSizeOrCurrPageChangeCallBack 这个回调可以用于...
  • paging paging 分页渲染数据生成器 定制开发 提供渲染数据接口便于二次开发 用户体验 可配置跳转前/后指定页 快速开发 提供配套 版本 Creator NimoChu
  • paging data

    2011-11-27 14:37:04
    This is a java paging sharing ppt,please don't download
  • Paging Library

    2018-08-01 09:48:59
    英文原文:...paging library 可以让 app 进行大数据查询的时候,在不过多增加设备负担或者等待时间的情况下,让渐进的从数据源加载数据变得更加简单。 概览 许多app都要用到大数据的加载,但是...
  • 自定义Paging分页

    2020-09-21 16:30:26
    自定义Paging分页
  • paging分页插件

    2018-09-30 16:04:20
    paging分页插件,用于table分页,小巧,使用简单方便.
  • Paging消息

    千次阅读 2019-05-31 14:15:34
    Paging消息的作用: 向处于RRC_IDLE态的UE发送呼叫请求; 通知处于RRC_IDLE和RRC_CONNECTED态的UE,系统消息发生了变化; 通知UE开始接收ETWS primary通知和/或ETWS secondary通知; 通知UE开始接收CMAS通知...
  • Paging笔记

    2019-05-28 16:50:02
    LTE Paging笔记idle状态connected状态 idle状态 终端为了接收寻呼消息需要监听PDCCH上是否有P-RNTI加扰的DCI信息。如果终端一直监听PDCCH会导致耗电问题,因此引入不连续接收(DRX)机制。 DRX的周期在sib2中配置,...
  • table-paging-源码

    2021-03-14 05:14:39
    table-paging
  • 使用Kotlin Flow和RxJava实现Paging3 由从TMDB加载影片的4部分组成: 标签1:使用Kotlin Flow使用PagingSource 标签2:使用Kotlin Flow使用RemoteMediator 标签3:使用RxJava使用RxPagingSource 选项卡4:使用...
  • LTE Paging

    千次阅读 2020-04-27 11:07:30
    LTE中的paging是一项重要行为。网络可以向空闲状态和连接状态的UE发送寻呼,寻呼过程可以由核心网触发,用于通知某个UE接收寻呼请求;或者由eNodeB触发,用于通知系统信息更新,以及通知UE接收ETWS以及CMAS等信息。...
  • JetPack Paging

    2019-11-03 14:39:58
    implementation 'android.arch.paging:runtime:2.1.0' 创建Adapter继承PagedListAdapter 并在类里创建viewholder,获取需要的控件 public class AdapterPaging extends PagedListAdapter <Student, ...
  • Jetpack之Paging

    2021-05-17 12:23:10
    Android Jetpack之Paging初探 Paging在RecyclerView中的应用,有这一篇就够了 JectPack组件开发7-----Paging分页加载组件(网络加载分页数据) Jetpack之Paging 使用
  • datagridview paging

    2019-10-08 12:43:46
    http://www.codeproject.com/Articles/211551/A-Simple-way-for-Paging-in-DataGridView-in-WinForm 转载于:https://www.cnblogs.com/jjj250/p/3173030.html
  • LTE paging注释

    万次阅读 2017-08-30 11:37:27
    paging消息注释
  • UMTS paging basics

    2010-01-13 07:19:57
    UMTS paging basics UMTS paging basics UMTS paging basics
  • Jetpack Paging3 基本使用

    千次阅读 2020-08-02 21:34:08
    Paging3 Paging3,是Jetpack提供给开发者用来显示本地或者网络数据集的分页库。针对这类场景,传统的做法是用RecyclerView的加载更多来实现分页加载,很多逻辑需要自行处理且不一定完善。Paging3相当于是官网提供的...
  • PAE Paging

    千次阅读 2013-11-20 21:53:45
    PAE Paging与32-Bit Paging的区别 PAE Paging与32-Bit Paging的不同点在于PAE Paging可将32-Bit的线性地址转换成最高52位的物理地址,不过受到线性地址宽度的限制,最高可访问的线性地址空间还是4G。还有就是PAE ...
  • no paging slider

    2021-01-10 11:24:43
    <div><p>The important feature "paging slider" which is not included.</p><p>该提问来源于开源项目:futurepress/epub.js</p></div>
  • MMU paging

    千次阅读 2013-12-18 15:43:15
    MMU paging

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