org.bitcoinj.wallet

Class WalletFiles

java.lang.Object

org.bitcoinj.wallet.WalletFiles

public class WalletFiles
extends Object

A class that handles atomic and optionally delayed writing of the wallet file to disk. In future: backups too. It can be useful to delay writing of a wallet file to disk on slow devices where disk and serialization overhead can come to dominate the chain processing speed, i.e. on Android phones. By coalescing writes and doing serialization and disk IO on a background thread performance can be improved.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	WalletFiles.Listener Implementors can do pre/post treatment of the wallet file.

Constructor Summary

Constructors

Constructor and Description
WalletFiles(Wallet wallet, File file, long delay, TimeUnit delayTimeUnit) Initialize atomic and optionally delayed writing of the wallet file to disk.

Method Summary

Modifier and Type	Method and Description
void	saveLater() Queues up a save in the background.
void	saveNow() Actually write the wallet file to disk, using an atomic rename when possible.
void	setListener(WalletFiles.Listener listener) The given listener will be called on the autosave thread before and after the wallet is saved to disk.
void	shutdownAndWait() Shut down auto-saving.

Methods inherited from class java.lang.Object

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

Constructor Detail

WalletFiles

public WalletFiles(Wallet wallet,
                   File file,
                   long delay,
                   TimeUnit delayTimeUnit)

Initialize atomic and optionally delayed writing of the wallet file to disk. Note the initial wallet state isn't saved automatically. The Wallet calls saveNow() or saveLater() as wallet state changes, depending on the urgency of the changes.

Method Detail

setListener

public void setListener(@Nonnull
                        WalletFiles.Listener listener)

The given listener will be called on the autosave thread before and after the wallet is saved to disk.

saveNow

public void saveNow()
             throws IOException

Actually write the wallet file to disk, using an atomic rename when possible. Runs on the current thread.

Throws:

IOException

saveLater

public void saveLater()

Queues up a save in the background. Useful for not very important wallet changes.

shutdownAndWait

public void shutdownAndWait()

Shut down auto-saving.