PageBlockMgr (Apache Jena - DBOE Base 3.12.0)

java.lang.Object
- org.apache.jena.dboe.base.page.PageBlockMgr<T>

All Implemented Interfaces:

org.apache.jena.atlas.lib.Closeable

Direct Known Subclasses:

RecordBufferPageMgr
```
public class PageBlockMgr<T extends Page>
extends Object
implements org.apache.jena.atlas.lib.Closeable
```
Engine that wraps from blocks to typed pages.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`long`	`allocLimit()`
`void`	`close()`
`T`	`create(BlockType bType)` Allocate a new thing
`void`	`dump()`
`void`	`finishRead()` Signal the completion of an read operation
`void`	`finishUpdate()` Signal the completion of an update operation
`void`	`free(Page page)`
`BlockMgr`	`getBlockMgr()`
`T`	`getRead(int id)` Fetch a block for reading.
`T`	`getRead(int id, int referencingId)` Fetch a block for reading.
`T`	`getWrite(int id)` Fetch a block for writing.
`T`	`getWrite(int id, int referencingId)` Fetch a block for writing.
`boolean`	`promoteDuplicate(Page page)` Promote a page - return 'true' if the block changed (.reset()) will have been called
`void`	`promoteInPlace(Page page)` Promote a page to be writable in-place (block id does not change, hence page does not change id).
`void`	`put(T page)`
`void`	`release(Page page)`
`void`	`resetAlloc(long boundary)`
`void`	`startRead()` Signal the start of an read operation
`void`	`startUpdate()` Signal the start of an update operation
`boolean`	`valid(int id)`
`void`	`write(T page)`

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - getBlockMgr
```
public BlockMgr getBlockMgr()
```
  - allocLimit
```
public long allocLimit()
```
  - resetAlloc
```
public void resetAlloc(long boundary)
```
  - create
```
public T create(BlockType bType)
```
    Allocate a new thing
  - getRead
```
public T getRead(int id)
```
    Fetch a block for reading.
    
    Parameters:
    
    id - Block to fetch
  - getRead
```
public T getRead(int id,
                 int referencingId)
```
    Fetch a block for reading.
    
    Parameters:
    
    id - Block to fetch
    
    referencingId - Id of block referring to this one. For example, a parent in a tree. May be negative for "none" or "meaningless".
  - getWrite
```
public T getWrite(int id)
```
    Fetch a block for writing.
    
    Parameters:
    
    id - Block to fetch
  - getWrite
```
public T getWrite(int id,
                  int referencingId)
```
    Fetch a block for writing.
    
    Parameters:
    
    id - Block to fetch
    
    referencingId - Id of block referring to this one. For example, a parent in a tree. May be -1 for "none" or "meaningless".
  - put
```
public void put(T page)
```
  - write
```
public void write(T page)
```
  - release
```
public void release(Page page)
```
  - free
```
public void free(Page page)
```
  - promoteInPlace
```
public void promoteInPlace(Page page)
```
    Promote a page to be writable in-place (block id does not change, hence page does not change id).
  - promoteDuplicate
```
public boolean promoteDuplicate(Page page)
```
    Promote a page - return 'true' if the block changed (.reset()) will have been called
  - valid
```
public boolean valid(int id)
```
  - dump
```
public void dump()
```
  - startUpdate
```
public void startUpdate()
```
    Signal the start of an update operation
  - finishUpdate
```
public void finishUpdate()
```
    Signal the completion of an update operation
  - startRead
```
public void startRead()
```
    Signal the start of an read operation
  - finishRead
```
public void finishRead()
```
    Signal the completion of an read operation
  - close
```
public void close()
```
    Specified by:
    
    close in interface org.apache.jena.atlas.lib.Closeable

Class PageBlockMgr<T extends Page>

Method Summary

Methods inherited from class java.lang.Object

Method Detail

getBlockMgr

allocLimit

resetAlloc

create

getRead

getRead

getWrite

getWrite

put

write

release

free

promoteInPlace

promoteDuplicate

valid

dump

startUpdate

finishUpdate

startRead

finishRead

close