com.bigdata.journal

Class SnapshotTask

java.lang.Object

com.bigdata.journal.SnapshotTask

All Implemented Interfaces:

Callable<ISnapshotResult>

public class SnapshotTask
extends Object
implements Callable<ISnapshotResult>

Take a snapshot of the journal.

Author:

bryan

See Also:

Snapshot mechanism breaks with metabit demi-spaces , Online backup for Journal

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	SnapshotTask.Options

Field Summary

Fields

Modifier and Type	Field and Description
protected static org.apache.log4j.Logger	log
static String	SNAPSHOT_TMP_PREFIX The prefix for the temporary files used to generate snapshots.
static String	SNAPSHOT_TMP_SUFFIX The suffix for the temporary files used to generate snapshots.

Constructor Summary

Constructors

Constructor and Description
SnapshotTask(Journal journal, ISnapshotFactory snapshotFactory)

Method Summary

Methods

Modifier and Type	Method and Description
ISnapshotResult	call()
static void	decompress(File src, File dst) Decompress a snapshot onto the specified file.

Methods inherited from class java.lang.Object

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

Field Detail

log

protected static final org.apache.log4j.Logger log

SNAPSHOT_TMP_PREFIX

public static final String SNAPSHOT_TMP_PREFIX

The prefix for the temporary files used to generate snapshots.

See Also:

Constant Field Values

SNAPSHOT_TMP_SUFFIX

public static final String SNAPSHOT_TMP_SUFFIX

The suffix for the temporary files used to generate snapshots.

See Also:

Constant Field Values

Constructor Detail

SnapshotTask

public SnapshotTask(Journal journal,
            ISnapshotFactory snapshotFactory)

Method Detail

call

public ISnapshotResult call()
                     throws Exception

Specified by:

call in interface Callable<ISnapshotResult>

Throws:

Exception

decompress

public static void decompress(File src,
              File dst)
                       throws IOException

Decompress a snapshot onto the specified file. The original file is not modified.

Parameters:

src - The snapshot.

dst - The file onto which the decompressed snapshot will be written.

Throws:

IOException - if the source file does not exist.

IOException - if the destination file exists and is not empty.

IOException - if there is a problem decompressing the source file onto the destination file.