| java.lang.Object
 com.db4o.defragment.Defragment
| Defragment | | public class Defragment (Code) | | defragments database files.
db4o structures storage inside database files as free and occupied slots, very
much like a file system - and just like a file system it can be fragmented.
The simplest way to defragment a database file:
Defragment.defrag("sample.yap");
This will move the file to "sample.yap.backup", then create a defragmented
version of this file in the original position, using a temporary file
"sample.yap.mapping". If the backup file already exists, this will throw an
exception and no action will be taken.
For more detailed configuration of the defragmentation process, provide a
DefragmentConfig instance:
DefragmentConfig config=new DefragmentConfig("sample.yap","sample.bap",new BTreeIDMapping("sample.map"));
config.forceBackupDelete(true);
config.storedClassFilter(new AvailableClassFilter());
config.db4oConfig(db4oConfig);
Defragment.defrag(config);
This will move the file to "sample.bap", then create a defragmented version
of this file in the original position, using a temporary file "sample.map" for BTree mapping.
If the backup file already exists, it will be deleted. The defragmentation
process will skip all classes that have instances stored within the yap file,
but that are not available on the class path (through the current
classloader). Custom db4o configuration options are read from the
com.db4o.config.Configuration Configuration passed as db4oConfig.
Note: For some specific, non-default configuration settings like
UUID generation, etc., you must pass an appropriate db4o configuration,
just like you'd use it within your application for normal database operation.
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| Method Summary | |
| public static void | defrag(String origPath)
Renames the file at the given original path to a backup file and then
builds a defragmented version of the file in the original place. | | public static void | defrag(String origPath, String backupPath)
Renames the file at the given original path to the given backup file and
then builds a defragmented version of the file in the original place. | | public static void | defrag(DefragmentConfig config)
Renames the file at the configured original path to the configured backup
path and then builds a defragmented version of the file in the original
place. | | public static void | defrag(DefragmentConfig config, DefragmentListener listener)
Renames the file at the configured original path to the configured backup
path and then builds a defragmented version of the file in the original
place. |
| defrag | | public static void defrag(String origPath) throws IOException(Code) | | Renames the file at the given original path to a backup file and then
builds a defragmented version of the file in the original place.
Parameters:
origPath - The path to the file to be defragmented.
throws:
IOException - if the original file cannot be moved to the backup location |
| defrag | | public static void defrag(String origPath, String backupPath) throws IOException(Code) | | Renames the file at the given original path to the given backup file and
then builds a defragmented version of the file in the original place.
Parameters:
origPath - The path to the file to be defragmented.
Parameters:
backupPath - The path to the backup file to be created.
throws:
IOException - if the original file cannot be moved to the backup location |
| defrag | | public static void defrag(DefragmentConfig config) throws IOException(Code) | | Renames the file at the configured original path to the configured backup
path and then builds a defragmented version of the file in the original
place.
Parameters:
config - The configuration for this defragmentation run.
throws:
IOException - if the original file cannot be moved to the backup location |
| defrag | | public static void defrag(DefragmentConfig config, DefragmentListener listener) throws IOException(Code) | | Renames the file at the configured original path to the configured backup
path and then builds a defragmented version of the file in the original
place.
Parameters:
config - The configuration for this defragmentation run.
Parameters:
listener - A listener for status notifications during the defragmentationprocess.
throws:
IOException - if the original file cannot be moved to the backup location |
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