org.apache.iotdb.db.engine.modification

类 ModificationFile

java.lang.Object

org.apache.iotdb.db.engine.modification.ModificationFile

所有已实现的接口:

AutoCloseable

public class ModificationFile
extends Object
implements AutoCloseable

ModificationFile stores the Modifications of a TsFile or unseq file in another file in the same directory. Methods in this class are highly synchronized for concurrency safety.

字段概要

字段

限定符和类型	字段和说明
static String	COMPACTION_FILE_SUFFIX
static String	FILE_SUFFIX

构造器概要

构造器

构造器和说明
ModificationFile(String filePath) Construct a ModificationFile using a file as its storage.

方法概要

限定符和类型	方法和说明
void	abort()
void	close() Release resources such as streams and caches.
ModificationFile	createHardlink() Create a hardlink for the modification file.
boolean	exists()
static ModificationFile	getCompactionMods(TsFileResource tsFileResource)
String	getFilePath()
Collection<Modification>	getModifications() Get all modifications stored in this file.
static ModificationFile	getNormalMods(TsFileResource tsFileResource)
void	remove()
void	setFilePath(String filePath)
void	write(Modification mod) Write a modification in this file.

从类继承的方法 java.lang.Object

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

字段详细资料

FILE_SUFFIX

public static final String FILE_SUFFIX

另请参阅:

常量字段值

COMPACTION_FILE_SUFFIX

public static final String COMPACTION_FILE_SUFFIX

另请参阅:

常量字段值

构造器详细资料

ModificationFile

public ModificationFile(String filePath)

Construct a ModificationFile using a file as its storage.

参数:

filePath - the path of the storage file.

方法详细资料

close

public void close()
           throws IOException

Release resources such as streams and caches.

指定者:

close 在接口中 AutoCloseable

抛出:

IOException

abort

public void abort()
           throws IOException

抛出:

IOException

write

public void write(Modification mod)
           throws IOException

Write a modification in this file. The modification will first be written to the persistent store then the memory cache.

参数:

mod - the modification to be written.

抛出:

IOException - if IOException is thrown when writing the modification to the store.

getModifications

public Collection<Modification> getModifications()

Get all modifications stored in this file.

返回:

an ArrayList of modifications.

getFilePath

public String getFilePath()

setFilePath

public void setFilePath(String filePath)

remove

public void remove()
            throws IOException

抛出:

IOException

exists

public boolean exists()

createHardlink

public ModificationFile createHardlink()

Create a hardlink for the modification file. The hardlink with have a suffix like ".{sysTime}_{randomLong}"

返回:

a new ModificationFile with its path changed to the hardlink, or null if the origin file does not exist or the hardlink cannot be created.

getNormalMods

public static ModificationFile getNormalMods(TsFileResource tsFileResource)

getCompactionMods

public static ModificationFile getCompactionMods(TsFileResource tsFileResource)