com.alibaba.innodb.java.reader.page.index

类 Index

java.lang.Object

com.alibaba.innodb.java.reader.page.AbstractPage

com.alibaba.innodb.java.reader.page.index.Index

public class Index
extends AbstractPage

Index page

作者:

xu.zx

字段概要

从类继承的字段 com.alibaba.innodb.java.reader.page.AbstractPage

innerPage, sliceInput

构造器概要

构造器

构造器和说明
Index(InnerPage innerPage, Schema schema)

方法概要

限定符和类型	方法和说明
boolean	isLeafPage()
boolean	isRootPage()
int	usedBytesInIndexPage() Get used bytes in a page.

从类继承的方法 com.alibaba.innodb.java.reader.page.AbstractPage

getFilHeader, getPageNumber, getSliceInput, pageType, toString

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

构造器详细资料

Index

public Index(InnerPage innerPage,
             Schema schema)

方法详细资料

isLeafPage

public boolean isLeafPage()

isRootPage

public boolean isRootPage()

usedBytesInIndexPage

public int usedBytesInIndexPage()

Get used bytes in a page. For example, given a page like below, the used bytes is 1000 + 376 + 8 - 240 = 1144

      0 +----------------------+  ... page offset 0
        |      FilHeader       |
     38 +----------------------+
    138 |        row 1         |
    400 |        row 2         |
    660 | row 3 (mark deleted) |  ... Deleted record will be counted as free space
    800 |        row 4         |
    920 |        row 5         |  ... Heap top position. The byte offset of the "end" of the currently used space
   1000 +----------------------+
        |                      |
        |                      |  ... Free space
  16000 +----------------------+
        |   Directory slots    |
  16376 +----------------------+
        |      FilTrailer      |
  16384 +----------------------+  ... page offset SIZE_OF_PAGE, usually 16KiB
 

返回:

used bytes