ExclusiveWriteLogNode (IoTDB Server 0.13.2 API)

java.lang.Object
- org.apache.iotdb.db.writelog.node.ExclusiveWriteLogNode

所有已实现的接口:

Comparable<ExclusiveWriteLogNode>, WriteLogNode
```
public class ExclusiveWriteLogNode
extends Object
implements WriteLogNode, Comparable<ExclusiveWriteLogNode>
```
This WriteLogNode is used to manage insert ahead logs of a TsFile.

字段概要

字段
限定符和类型字段和说明

static String WAL_FILE_NAME

字段
限定符和类型	字段和说明
`static String`	`WAL_FILE_NAME`

构造器概要

构造器
构造器和说明

ExclusiveWriteLogNode(String identifier)
constructor of ExclusiveWriteLogNode.

构造器
构造器和说明
`ExclusiveWriteLogNode(String identifier)` constructor of ExclusiveWriteLogNode.

方法概要

所有方法实例方法具体方法
限定符和类型	方法和说明
`void`	`close()` Sync and close streams.
`int`	`compareTo(ExclusiveWriteLogNode o)`
`ByteBuffer[]`	`delete()` Abandon all logs in this node and delete the log directory.
`boolean`	`equals(Object obj)`
`void`	`forceSync()` Write what in cache to disk.
`String`	`getIdentifier()` return identifier of the log node.
`String`	`getLogDirectory()` return the directory where wal files of this node are placed.
`ILogReader`	`getLogReader()` return an ILogReader which can iterate each log in this log node.
`int`	`hashCode()`
`void`	`initBuffer(ByteBuffer[] byteBuffers)` init the buffers, this should be called after this node being created.
`void`	`notifyEndFlush()` When data that have WALs in this node end flushing, this method must be called to check and remove the out-dated logs file.
`void`	`notifyStartFlush()` When data that have WALs in this node start to be flushed, this method must be called to change the working WAL file.
`void`	`release()` Release the resource it occupies.
`String`	`toString()`
`void`	`write(PhysicalPlan plan)` Write a wal for a PhysicalPlan.

从类继承的方法 java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- 字段详细资料
  - WAL_FILE_NAME
```
public static final String WAL_FILE_NAME
```
    另请参阅:
    
    常量字段值
- 构造器详细资料
  - ExclusiveWriteLogNode
```
public ExclusiveWriteLogNode(String identifier)
```
    constructor of ExclusiveWriteLogNode.
    
    参数:
    
    identifier - ExclusiveWriteLogNode identifier
- 方法详细资料
  - initBuffer
```
public void initBuffer(ByteBuffer[] byteBuffers)
```
    从接口复制的说明: WriteLogNode
    
    init the buffers, this should be called after this node being created.
    
    指定者:
    
    initBuffer 在接口中 WriteLogNode
  - write
```
public void write(PhysicalPlan plan)
           throws IOException
```
    从接口复制的说明: WriteLogNode
    
    Write a wal for a PhysicalPlan. First, the PhysicalPlan will be conveyed to byte[]. Then the byte[] will be put into a cache. When the cache is full, the logs in the cache will be synced to disk.
    
    指定者:
    
    write 在接口中 WriteLogNode
    
    参数:
    
    plan - - a PhysicalPlan
    
    抛出:
    
    IOException
  - close
```
public void close()
```
    从接口复制的说明: WriteLogNode
    
    Sync and close streams.
    
    指定者:
    
    close 在接口中 WriteLogNode
  - release
```
public void release()
```
    从接口复制的说明: WriteLogNode
    
    Release the resource it occupies. After this method is invoked, this node should be no longer to used
    
    指定者:
    
    release 在接口中 WriteLogNode
  - forceSync
```
public void forceSync()
```
    从接口复制的说明: WriteLogNode
    
    Write what in cache to disk.
    
    指定者:
    
    forceSync 在接口中 WriteLogNode
  - notifyStartFlush
```
public void notifyStartFlush()
                      throws FileNotFoundException
```
    从接口复制的说明: WriteLogNode
    
    When data that have WALs in this node start to be flushed, this method must be called to change the working WAL file.
    
    指定者:
    
    notifyStartFlush 在接口中 WriteLogNode
    
    抛出:
    
    FileNotFoundException
  - notifyEndFlush
```
public void notifyEndFlush()
```
    从接口复制的说明: WriteLogNode
    
    When data that have WALs in this node end flushing, this method must be called to check and remove the out-dated logs file.
    
    指定者:
    
    notifyEndFlush 在接口中 WriteLogNode
  - getIdentifier
```
public String getIdentifier()
```
    从接口复制的说明: WriteLogNode
    
    return identifier of the log node.
    
    指定者:
    
    getIdentifier 在接口中 WriteLogNode
    
    返回:
    
    The identifier of this log node.
  - getLogDirectory
```
public String getLogDirectory()
```
    从接口复制的说明: WriteLogNode
    
    return the directory where wal files of this node are placed.
    
    指定者:
    
    getLogDirectory 在接口中 WriteLogNode
    
    返回:
    
    The directory where wal files of this node are placed.
  - delete
```
public ByteBuffer[] delete()
                    throws IOException
```
    从接口复制的说明: WriteLogNode
    
    Abandon all logs in this node and delete the log directory. Calling insert() after calling this method is undefined.
    
    指定者:
    
    delete 在接口中 WriteLogNode
    
    抛出:
    
    IOException
  - getLogReader
```
public ILogReader getLogReader()
```
    从接口复制的说明: WriteLogNode
    
    return an ILogReader which can iterate each log in this log node.
    
    指定者:
    
    getLogReader 在接口中 WriteLogNode
    
    返回:
    
    an ILogReader which can iterate each log in this log node.
  - hashCode
```
public int hashCode()
```
    覆盖:
    
    hashCode 在类中 Object
  - equals
```
public boolean equals(Object obj)
```
    覆盖:
    
    equals 在类中 Object
  - toString
```
public String toString()
```
    覆盖:
    
    toString 在类中 Object
  - compareTo
```
public int compareTo(ExclusiveWriteLogNode o)
```
    指定者:
    
    compareTo 在接口中 Comparable<ExclusiveWriteLogNode>

类 ExclusiveWriteLogNode

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

WAL_FILE_NAME

构造器详细资料

ExclusiveWriteLogNode

方法详细资料

initBuffer

write

close

release

forceSync

notifyStartFlush

notifyEndFlush

getIdentifier

getLogDirectory

delete

getLogReader

hashCode

equals

toString

compareTo