Package org.apache.bookkeeper.meta

Interface LedgerManager

All Superinterfaces:

AutoCloseable, Closeable

All Known Implementing Classes:

AbstractHierarchicalLedgerManager, AbstractZkLedgerManager, CleanupLedgerManager, FlatLedgerManager, HierarchicalLedgerManager, LegacyHierarchicalLedgerManager, LongHierarchicalLedgerManager, MSLedgerManagerFactory.MsLedgerManager, NullMetadataBookieDriver.NullLedgerManager

public interface LedgerManager
extends Closeable

LedgerManager takes responsibility of ledger management in client side.

• How to store ledger meta (e.g. in ZooKeeper or other key/value store)

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static class	LedgerManager.LedgerRange	Used to represent the Ledgers range returned from the current scan.
static interface	LedgerManager.LedgerRangeIterator	Interface of the ledger meta range iterator from storage (e.g.

Method Summary

Modifier and Type	Method	Description
void	asyncProcessLedgers(BookkeeperInternalCallbacks.Processor<Long> processor, org.apache.zookeeper.AsyncCallback.VoidCallback finalCb, Object context, int successRc, int failureRc)	Loop to process all ledgers.
CompletableFuture<Versioned<LedgerMetadata>>	createLedgerMetadata(long ledgerId, LedgerMetadata metadata)	Create a new ledger with provided ledger id and metadata.
LedgerManager.LedgerRangeIterator	getLedgerRanges(long zkOpTimeOutMs)	Loop to scan a range of metadata from metadata storage.
CompletableFuture<Versioned<LedgerMetadata>>	readLedgerMetadata(long ledgerId)	Read ledger metadata of a specified ledger.
void	registerLedgerMetadataListener(long ledgerId, BookkeeperInternalCallbacks.LedgerMetadataListener listener)	Register the ledger metadata listener on ledgerId.
CompletableFuture<Void>	removeLedgerMetadata(long ledgerId, Version version)	Remove a specified ledger metadata by ledgerId and version.
void	unregisterLedgerMetadataListener(long ledgerId, BookkeeperInternalCallbacks.LedgerMetadataListener listener)	Unregister the ledger metadata listener on ledgerId.
CompletableFuture<Versioned<LedgerMetadata>>	writeLedgerMetadata(long ledgerId, LedgerMetadata metadata, Version currentVersion)	Write ledger metadata.

Methods inherited from interface java.io.Closeable

close

Method Details

createLedgerMetadata

CompletableFuture<Versioned<LedgerMetadata>> createLedgerMetadata(long ledgerId,
 LedgerMetadata metadata)

Create a new ledger with provided ledger id and metadata.

Parameters:

ledgerId - Ledger id provided to be created

metadata - Metadata provided when creating the new ledger

Returns:

Future which, when completed returns the metadata of the newly created ledger. Completed with an exception:

• BKException.BKLedgerExistException if given ledger id exist
• BKException.ZKException /BKException.BKMetadataSerializationException for other issues

removeLedgerMetadata

CompletableFuture<Void> removeLedgerMetadata(long ledgerId,
 Version version)

Remove a specified ledger metadata by ledgerId and version.

Parameters:

ledgerId - Ledger Id

version - Ledger metadata version

Returns:

Future which, when completed, denotes that the ledger metadata has been removed. Completed with an exception:

• BKException.BKMetadataVersionException if version doesn't match
• BKException.BKNoSuchLedgerExistsOnMetadataServerException if ledger not exist
• BKException.ZKException for other issues

readLedgerMetadata

CompletableFuture<Versioned<LedgerMetadata>> readLedgerMetadata(long ledgerId)

Read ledger metadata of a specified ledger.

Parameters:

ledgerId - Ledger Id

Returns:

Future which, when completed, contains the requested versioned metadata. Completed with an exception::

• BKException.BKNoSuchLedgerExistsOnMetadataServerException if ledger not exist
• BKException.ZKException for other issues

writeLedgerMetadata

CompletableFuture<Versioned<LedgerMetadata>> writeLedgerMetadata(long ledgerId,
 LedgerMetadata metadata,
 Version currentVersion)

Write ledger metadata.

Parameters:

ledgerId - Ledger Id

metadata - Ledger Metadata to write

currentVersion - The version of the metadata we expect to be overwriting.

Returns:

Future which, when completed, contains the newly written metadata. Completed with an exception:

• BKException.BKMetadataVersionException if version in metadata doesn't match
• BKException.ZKException for other issue

registerLedgerMetadataListener

void registerLedgerMetadataListener(long ledgerId,
 BookkeeperInternalCallbacks.LedgerMetadataListener listener)

Register the ledger metadata listener on ledgerId.

Parameters:

ledgerId - ledger id.

listener - listener.

unregisterLedgerMetadataListener

void unregisterLedgerMetadataListener(long ledgerId,
 BookkeeperInternalCallbacks.LedgerMetadataListener listener)

Unregister the ledger metadata listener on ledgerId.

Parameters:

ledgerId - ledger id.

listener - ledger metadata listener.

asyncProcessLedgers

void asyncProcessLedgers(BookkeeperInternalCallbacks.Processor<Long> processor,
 org.apache.zookeeper.AsyncCallback.VoidCallback finalCb,
 Object context,
 int successRc,
 int failureRc)

Loop to process all ledgers.

After all ledgers were processed, finalCb will be triggered:
• if all ledgers are processed done with OK, success rc will be passed to finalCb.
• if some ledgers are processed failed, failure rc will be passed to finalCb.

Parameters:

processor - Ledger Processor to process a specific ledger

finalCb - Callback triggered after all ledgers are processed

context - Context of final callback

successRc - Success RC code passed to finalCb when callback

failureRc - Failure RC code passed to finalCb when exceptions occurred.

getLedgerRanges

LedgerManager.LedgerRangeIterator getLedgerRanges(long zkOpTimeOutMs)

Loop to scan a range of metadata from metadata storage.

Parameters:

zkOpTimeOutMs - Iterator considers timeout while fetching ledger-range from zk.

Returns:

will return a iterator of the Ranges