paging

Paging 3.0 list with new params in Kotlin

由 五迷三道 提交于 2021-01-24 08:34:18
问题 I have the following code: val history: Flow<PagingData<Any>> = Pager(PagingConfig(pageSize = 10)) { PaginationBaseDataSource(apiService) }.flow .cachedIn(viewModelScope) This currently is displaying a list of items without any additional params. This works Ok... But now I wish to query this list based in certain params that the user can change in frontend, let´s say I wish to add the parameter 3 as a query. val history: Flow<PagingData<Any>> = Pager(PagingConfig(pageSize = 10)) {

Paging 3.0 list with new params in Kotlin

由 元气小坏坏 提交于 2021-01-24 08:34:07
问题 I have the following code: val history: Flow<PagingData<Any>> = Pager(PagingConfig(pageSize = 10)) { PaginationBaseDataSource(apiService) }.flow .cachedIn(viewModelScope) This currently is displaying a list of items without any additional params. This works Ok... But now I wish to query this list based in certain params that the user can change in frontend, let´s say I wish to add the parameter 3 as a query. val history: Flow<PagingData<Any>> = Pager(PagingConfig(pageSize = 10)) {

Solr Deep Paging(solr 深分页)

由 社会主义新天地 提交于 2020-12-12 20:37:58
转载请出自出处： http://eksliang.iteye.com/blog/2148370 作者：eksliang(ickes) blg: http://eksliang.iteye.com/ 概述 长期以来，我们一直有一个深分页问题。如果直接跳到很靠后的页数，查询速度会比较慢。这是因为Solr的需要为查询从开始遍历所有数据。直到Solr的4.7这个问题一直没有一个很好的解决方案。直到solr4.7引入了游标才解决这个问题。 问题 深分页的问题是很清楚。Solr必须为返回的搜索结果准备一个列表，并返回它的一部分。如果该部分来源于该列表的前面并不难。但如果我们想返回第10000页（每页20条记录）的数据，Solr需要准备一个包含大小为200000（10000 * 20）的列表。这样，它不仅需要时间，还需要内存。像我们现在生产上的历史数据达到了6个亿的数据，如果直接跳转到最后一页，必定内存溢出。 solr4.7是怎么解决这个问题的？ 答：Solr 4.7的发布改变了这一状况，引入了游标的概念。游标是一个动态结构，不需要存储在服务器上。游标包含了查询的结果的偏移量，因此，Solr的不再需要每次从头开始遍历结果直到我们想要的记录，游标的功能可以大幅提升深翻页的性能。 用法 游标的使用非常简单。在第一个查询中，我们需要传递一个额外的参数- cursorMark = *

Paging Compile Issue : Not sure how to convert a Cursor to this method's return type

由 为君一笑 提交于 2020-08-06 03:27:39
问题 I have been try to implemented the Paging Library with Room provided by google in Android Architecture Component.But its showing compile time error in my UserDao Class Here is the Error: Error:(22, 42) error: Not sure how to convert a Cursor to this method's return type My Question is what return Type ? UserDao.java @Dao public interface UserDao { @Query("SELECT * FROM user") LiveData<List<User>> getAll(); //Compile Error is here : Not sure how to convert a Cursor to this method's return type

Do x86 instructions require their own encoding as well as all of their arguments to be present in memory at the same time?

由 妖精的绣舞 提交于 2020-07-27 09:26:37
问题 I am trying to figure out whether it is possible to run a Linux VM whose RAM is only backed by a single physical page. To simulate this, I modified the nested page fault handler in KVM to remove the present bit from all nested page table (NPT) entries, except the one corresponding to the currently processed page fault. While trying to start a Linux guest, I observed that assembly instructions that use memory operands, like add [rbp+0x820DDA], ebp lead to a page fault loop until I restore the

Do x86 instructions require their own encoding as well as all of their arguments to be present in memory at the same time?

由 丶灬走出姿态 提交于 2020-07-27 09:26:27
问题 I am trying to figure out whether it is possible to run a Linux VM whose RAM is only backed by a single physical page. To simulate this, I modified the nested page fault handler in KVM to remove the present bit from all nested page table (NPT) entries, except the one corresponding to the currently processed page fault. While trying to start a Linux guest, I observed that assembly instructions that use memory operands, like add [rbp+0x820DDA], ebp lead to a page fault loop until I restore the

Do x86 instructions require their own encoding as well as all of their arguments to be present in memory at the same time?

由 有些话、适合烂在心里 提交于 2020-07-27 09:26:08
问题 I am trying to figure out whether it is possible to run a Linux VM whose RAM is only backed by a single physical page. To simulate this, I modified the nested page fault handler in KVM to remove the present bit from all nested page table (NPT) entries, except the one corresponding to the currently processed page fault. While trying to start a Linux guest, I observed that assembly instructions that use memory operands, like add [rbp+0x820DDA], ebp lead to a page fault loop until I restore the

Disabling Paging in x86 32bit

由 最后都变了- 提交于 2020-07-18 05:37:28
问题 I am trying to write directly to a physical memory location, so I am using an assembly function to first disable paging, write the value, and then re-enable paging, but for some reason a page fault is still triggered when trying to write the value. As I understand it, in x86-32bit, paging is set on and off by flipping bit 32 in cr0, so here is my assembly function: mov 4(%esp), %ecx //address mov 8(%esp), %edx //value mov %cr0, %eax and $0x7fffffff, %eax mov %eax, %cr0 mov %edx, (%ecx) //this

How to use empty view with pagination using paging library android?

由 喜欢而已 提交于 2020-06-10 12:12:05
问题 How to determine size of data returned before setting adapter? How to use emptyview with paging library? How to set emptyview if pagedlist returns null or no data? 回答1: Update[24/04/19]: I just found out that the library already provide us a way to listen to empty initial load, using PagedList.BoundaryCallback<YourItem> . *Note that my old answer is still a valid alternative. val livedPageList = LivePagedListBuilder(sourceFactory, config) .setBoundaryCallback(object: PagedList

What happens when you lose the virtual address of the page directory?

由 流过昼夜 提交于 2020-06-01 01:40:29
问题 I'm writing a memory manager for my kernel (32 bit x86) In the course of this... I'm facing a bit of a dilemma.... Description of virtual memory map: Identity map of first 4 Mb Virtual address 0xC0000000 mapped to physical address 0x100000 (Also a 4 Mb map) My page directory is at physical address 0x9c000. My page table 1 is at physical address 0x9d000. My page table 2 is at physical addres 0x9e000. (I need only two page tables here :) ... These correspond to the identity map and higher
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