com.google.bitcoin.store

Class H2FullPrunedBlockStore

java.lang.Object

com.google.bitcoin.store.H2FullPrunedBlockStore

All Implemented Interfaces:

BlockStore, FullPrunedBlockStore

public class H2FullPrunedBlockStore
extends Object
implements FullPrunedBlockStore

A full pruned block store using the H2 pure-java embedded database. Note that because of the heavy delete load on the database, during IBD, you may see the database files grow quite large (around 1.5G). H2 automatically frees some space at shutdown, so close()ing the database decreases the space usage somewhat (to only around 1.3G).

Constructor Summary

Constructors

Constructor and Description
H2FullPrunedBlockStore(NetworkParameters params, String dbName, int fullStoreDepth) Creates a new H2FullPrunedBlockStore
H2FullPrunedBlockStore(NetworkParameters params, String dbName, int fullStoreDepth, int cacheSize) Creates a new H2FullPrunedBlockStore with the given cache size

Method Summary

Methods

Modifier and Type	Method and Description
void	abortDatabaseBatchWrite()
void	addUnspentTransactionOutput(StoredTransactionOutput out) Adds a StoredTransactionOutput to the list of unspent TransactionOutputs
void	beginDatabaseBatchWrite() Begins/Commits/Aborts a database transaction.
void	close() Closes the store.
void	commitDatabaseBatchWrite()
void	dumpSizes() Dumps information about the size of actual data in the database to standard output The only truly useless data counted is printed in the form "N in id indexes" This does not take database indexes into account
StoredBlock	get(Sha256Hash hash) Returns the StoredBlock given a hash.
StoredBlock	get(Sha256Hash hash, boolean wasUndoableOnly)
StoredBlock	getChainHead() Returns the StoredBlock that represents the top of the chain of greatest total work.
StoredBlock	getOnceUndoableStoredBlock(Sha256Hash hash) Returns the StoredBlock that was added as a StoredUndoableBlock given a hash.
StoredTransactionOutput	getTransactionOutput(Sha256Hash hash, long index) Gets a StoredTransactionOutput with the given hash and index, or null if none is found
StoredUndoableBlock	getUndoBlock(Sha256Hash hash) Returns a StoredUndoableBlock whose block.getHash() method will be equal to the parameter.
StoredBlock	getVerifiedChainHead() Returns the StoredBlock that represents the top of the chain of greatest total work that has been fully verified and the point in the chain at which the unspent transaction output set in this store represents.
boolean	hasUnspentOutputs(Sha256Hash hash, int numOutputs) True if this store has any unspent outputs from a transaction with a hash equal to the first parameter
void	put(StoredBlock storedBlock) Saves the given block header+extra data.
void	put(StoredBlock storedBlock, StoredUndoableBlock undoableBlock) Saves the given StoredUndoableBlock and StoredBlock.
void	removeUnspentTransactionOutput(StoredTransactionOutput out) Removes a StoredTransactionOutput from the list of unspent TransactionOutputs Note that the coinbase of the genesis block should NEVER be spendable and thus never in the list.
void	resetStore()
void	setChainHead(StoredBlock chainHead) Sets the StoredBlock that represents the top of the chain of greatest total work.
void	setVerifiedChainHead(StoredBlock chainHead) Sets the StoredBlock that represents the top of the chain of greatest total work that has been fully verified.

Methods inherited from class java.lang.Object

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

Constructor Detail

H2FullPrunedBlockStore

public H2FullPrunedBlockStore(NetworkParameters params,
                      String dbName,
                      int fullStoreDepth)
                       throws BlockStoreException

Creates a new H2FullPrunedBlockStore

Parameters:

params - A copy of the NetworkParameters used

dbName - The path to the database on disk

fullStoreDepth - The number of blocks of history stored in full (something like 1000 is pretty safe)

Throws:

BlockStoreException - if the database fails to open for any reason

H2FullPrunedBlockStore

public H2FullPrunedBlockStore(NetworkParameters params,
                      String dbName,
                      int fullStoreDepth,
                      int cacheSize)
                       throws BlockStoreException

Creates a new H2FullPrunedBlockStore with the given cache size

Parameters:

params - A copy of the NetworkParameters used

dbName - The path to the database on disk

fullStoreDepth - The number of blocks of history stored in full (something like 1000 is pretty safe)

cacheSize - The number of kilobytes to dedicate to H2 Cache (the default value of 16MB (16384) is a safe bet to achieve good performance/cost when importing blocks from disk, past 32MB makes little sense, and below 4MB sees a sharp drop in performance)

Throws:

BlockStoreException - if the database fails to open for any reason

Method Detail

close

public void close()

Description copied from interface: BlockStore

Closes the store.

Specified by:

close in interface BlockStore

resetStore

public void resetStore()
                throws BlockStoreException

Throws:

BlockStoreException

dumpSizes

public void dumpSizes()
               throws SQLException,
                      BlockStoreException

Dumps information about the size of actual data in the database to standard output The only truly useless data counted is printed in the form "N in id indexes" This does not take database indexes into account

Throws:

SQLException

BlockStoreException

put

public void put(StoredBlock storedBlock)
         throws BlockStoreException

Description copied from interface: BlockStore

Saves the given block header+extra data. The key isn't specified explicitly as it can be calculated from the StoredBlock directly. Can throw if there is a problem with the underlying storage layer such as running out of disk space.

Specified by:

put in interface BlockStore

Throws:

BlockStoreException

put

public void put(StoredBlock storedBlock,
       StoredUndoableBlock undoableBlock)
         throws BlockStoreException

Description copied from interface: FullPrunedBlockStore

Saves the given StoredUndoableBlock and StoredBlock. Calculates keys from the StoredBlock

Though not required for proper function of a FullPrunedBlockStore, any user of a FullPrunedBlockStore should ensure that a StoredUndoableBlock for each block up to the fully verified chain head has been added to this block store using this function (not put(StoredBlock)), so that the ability to perform reorgs is maintained.

Specified by:

put in interface FullPrunedBlockStore

Throws:

BlockStoreException - if there is a problem with the underlying storage layer, such as running out of disk space.

get

@Nullable
public StoredBlock get(Sha256Hash hash,
                       boolean wasUndoableOnly)
                throws BlockStoreException

Throws:

BlockStoreException

get

@Nullable
public StoredBlock get(Sha256Hash hash)
                throws BlockStoreException

Description copied from interface: BlockStore

Returns the StoredBlock given a hash. The returned values block.getHash() method will be equal to the parameter. If no such block is found, returns null.

Specified by:

get in interface BlockStore

Throws:

BlockStoreException

getOnceUndoableStoredBlock

@Nullable
public StoredBlock getOnceUndoableStoredBlock(Sha256Hash hash)
                                       throws BlockStoreException

Description copied from interface: FullPrunedBlockStore

Returns the StoredBlock that was added as a StoredUndoableBlock given a hash. The returned values block.getHash() method will be equal to the parameter. If no such block is found, returns null.

Specified by:

getOnceUndoableStoredBlock in interface FullPrunedBlockStore

Throws:

BlockStoreException

getUndoBlock

@Nullable
public StoredUndoableBlock getUndoBlock(Sha256Hash hash)
                                 throws BlockStoreException

Description copied from interface: FullPrunedBlockStore

Returns a StoredUndoableBlock whose block.getHash() method will be equal to the parameter. If no such block is found, returns null. Note that this may return null more often than get(Sha256Hash hash) as not all StoredBlocks have a StoredUndoableBlock copy stored as well.

Specified by:

getUndoBlock in interface FullPrunedBlockStore

Throws:

BlockStoreException

getChainHead

public StoredBlock getChainHead()
                         throws BlockStoreException

Description copied from interface: BlockStore

Returns the StoredBlock that represents the top of the chain of greatest total work. Note that this can be arbitrarily expensive, you probably should use AbstractBlockChain.getChainHead() or perhaps AbstractBlockChain.getBestChainHeight() which will run in constant time and not take any heavyweight locks.

Specified by:

getChainHead in interface BlockStore

Throws:

BlockStoreException

setChainHead

public void setChainHead(StoredBlock chainHead)
                  throws BlockStoreException

Description copied from interface: BlockStore

Sets the StoredBlock that represents the top of the chain of greatest total work.

Specified by:

setChainHead in interface BlockStore

Throws:

BlockStoreException

getVerifiedChainHead

public StoredBlock getVerifiedChainHead()
                                 throws BlockStoreException

Description copied from interface: FullPrunedBlockStore

Returns the StoredBlock that represents the top of the chain of greatest total work that has been fully verified and the point in the chain at which the unspent transaction output set in this store represents.

Specified by:

getVerifiedChainHead in interface FullPrunedBlockStore

Throws:

BlockStoreException

setVerifiedChainHead

public void setVerifiedChainHead(StoredBlock chainHead)
                          throws BlockStoreException

Description copied from interface: FullPrunedBlockStore

Sets the StoredBlock that represents the top of the chain of greatest total work that has been fully verified. It should generally be set after a batch of updates to the transaction unspent output set, before a call to commitDatabaseBatchWrite. If chainHead has a greater height than the non-verified chain head (ie that set with BlockStore.setChainHead) the non-verified chain head should be set to the one set here. In this way a class using a FullPrunedBlockStore only in full-verification mode can ignore the regular BlockStore functions implemented as a part of a FullPrunedBlockStore.

Specified by:

setVerifiedChainHead in interface FullPrunedBlockStore

Throws:

BlockStoreException

getTransactionOutput

@Nullable
public StoredTransactionOutput getTransactionOutput(Sha256Hash hash,
                                                    long index)
                                             throws BlockStoreException

Description copied from interface: FullPrunedBlockStore

Gets a StoredTransactionOutput with the given hash and index, or null if none is found

Specified by:

getTransactionOutput in interface FullPrunedBlockStore

Throws:

BlockStoreException

addUnspentTransactionOutput

public void addUnspentTransactionOutput(StoredTransactionOutput out)
                                 throws BlockStoreException

Description copied from interface: FullPrunedBlockStore

Adds a StoredTransactionOutput to the list of unspent TransactionOutputs

Specified by:

addUnspentTransactionOutput in interface FullPrunedBlockStore

Throws:

BlockStoreException

removeUnspentTransactionOutput

public void removeUnspentTransactionOutput(StoredTransactionOutput out)
                                    throws BlockStoreException

Description copied from interface: FullPrunedBlockStore

Removes a StoredTransactionOutput from the list of unspent TransactionOutputs Note that the coinbase of the genesis block should NEVER be spendable and thus never in the list.

Specified by:

removeUnspentTransactionOutput in interface FullPrunedBlockStore

Throws:

BlockStoreException - if there is an underlying storage issue, or out was not in the list.

beginDatabaseBatchWrite

public void beginDatabaseBatchWrite()
                             throws BlockStoreException

Description copied from interface: FullPrunedBlockStore

Begins/Commits/Aborts a database transaction.

If abortDatabaseBatchWrite() is called by the same thread that called beginDatabaseBatchWrite(), any data writes between this call and abortDatabaseBatchWrite() made by the same thread should be discarded.

Furthermore, any data written after a call to beginDatabaseBatchWrite() should not be readable by any other threads until commitDatabaseBatchWrite() has been called by this thread. Multiple calls to beginDatabaseBatchWrite() in any given thread should be ignored and treated as one call.

Specified by:

beginDatabaseBatchWrite in interface FullPrunedBlockStore

Throws:

BlockStoreException

commitDatabaseBatchWrite

public void commitDatabaseBatchWrite()
                              throws BlockStoreException

Specified by:

commitDatabaseBatchWrite in interface FullPrunedBlockStore

Throws:

BlockStoreException

abortDatabaseBatchWrite

public void abortDatabaseBatchWrite()
                             throws BlockStoreException

Specified by:

abortDatabaseBatchWrite in interface FullPrunedBlockStore

Throws:

BlockStoreException

hasUnspentOutputs

public boolean hasUnspentOutputs(Sha256Hash hash,
                        int numOutputs)
                          throws BlockStoreException

Description copied from interface: FullPrunedBlockStore

True if this store has any unspent outputs from a transaction with a hash equal to the first parameter

Specified by:

hasUnspentOutputs in interface FullPrunedBlockStore

numOutputs - the number of outputs the given transaction has

Throws:

BlockStoreException