SnapshotTaker (IoTDB Server 0.14.0-preview2 API)

java.lang.Object
- org.apache.iotdb.db.engine.snapshot.SnapshotTaker

```
public class SnapshotTaker
extends java.lang.Object
```
SnapshotTaker takes data snapshot for a DataRegion in one time. It does so by creating hard link for files or copying them. SnapshotTaker supports two different ways of snapshot: Full Snapshot and Incremental Snapshot. The former takes a snapshot for all files in an empty directory, and the latter takes a snapshot based on the snapshot that took before.

Constructor Summary

Constructors
Constructor Description

SnapshotTaker(DataRegion dataRegion)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.io.File`	`getSnapshotFilePathForTsFile(java.io.File tsFile, java.lang.String snapshotId)`	Construct the snapshot file path for a given tsfile, and will create the dir.
`boolean`	`takeFullSnapshot(java.lang.String snapshotDirPath, boolean flushBeforeSnapshot)`

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

- Constructor Detail
  - SnapshotTaker
```
public SnapshotTaker(DataRegion dataRegion)
```
- Method Detail
  - takeFullSnapshot
```
public boolean takeFullSnapshot(java.lang.String snapshotDirPath,
                                boolean flushBeforeSnapshot)
                         throws DirectoryNotLegalException,
                                java.io.IOException
```
    Throws:
    
    DirectoryNotLegalException
    
    java.io.IOException
  - getSnapshotFilePathForTsFile
```
public java.io.File getSnapshotFilePathForTsFile(java.io.File tsFile,
                                                 java.lang.String snapshotId)
                                          throws java.io.IOException
```
    Construct the snapshot file path for a given tsfile, and will create the dir. Eg, given a tsfile in /data/iotdb/data/sequence/root.testsg/1/0/1-1-0-0.tsfile, with snapshotId "sm123", the snapshot location will be /data/iotdb/data/snapshot/sm123/root.testsg/1/0/1-1-0-0.tsfile
    
    Parameters:
    
    tsFile - tsfile to be taken a snapshot
    
    snapshotId - the id for current snapshot
    
    Returns:
    
    the File object of the snapshot file, and its parent directory will be created
    
    Throws:
    
    java.io.IOException