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Make getBalance() significantly faster.

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Matt Corallo 2013-05-24 11:09:35 +02:00 committed by Mike Hearn
parent 72f346c10f
commit c9c107afaf
1 changed files with 31 additions and 29 deletions
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60
core/src/main/java/com/google/bitcoin/core/Wallet.java
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@ -143,8 +143,8 @@ public class Wallet implements Serializable, BlockChainListener {
/** Represents the results of a {@link CoinSelector#select(java.math.BigInteger, java.util.LinkedList)} operation */
public static class CoinSelection {
public BigInteger valueGathered;
public List<TransactionOutput> gathered;
public CoinSelection(BigInteger valueGathered, List<TransactionOutput> gathered) {
public Set<TransactionOutput> gathered;
public CoinSelection(BigInteger valueGathered, Set<TransactionOutput> gathered) {
this.valueGathered = valueGathered;
this.gathered = gathered;
}
@ -170,36 +170,38 @@ public class Wallet implements Serializable, BlockChainListener {
public CoinSelection select(BigInteger biTarget, LinkedList<TransactionOutput> candidates) {
long target = biTarget.longValue();
long total = 0;
LinkedList<TransactionOutput> selected = Lists.newLinkedList();
HashSet<TransactionOutput> selected = new HashSet<TransactionOutput>();
// Sort the inputs by age*value so we get the highest "coindays" spent.
// TODO: Consider changing the wallets internal format to track just outputs and keep them ordered.
ArrayList<TransactionOutput> sortedOutputs = new ArrayList<TransactionOutput>(candidates);
Collections.sort(sortedOutputs, new Comparator<TransactionOutput>() {
public int compare(TransactionOutput a, TransactionOutput b) {
int depth1 = 0;
int depth2 = 0;
TransactionConfidence conf1 = a.parentTransaction.getConfidence();
TransactionConfidence conf2 = b.parentTransaction.getConfidence();
if (conf1.getConfidenceType() == ConfidenceType.BUILDING) depth1 = conf1.getDepthInBlocks();
if (conf2.getConfidenceType() == ConfidenceType.BUILDING) depth2 = conf2.getDepthInBlocks();
BigInteger aCoinDepth = a.getValue().multiply(BigInteger.valueOf(depth1));
BigInteger bCoinDepth = b.getValue().multiply(BigInteger.valueOf(depth2));
if (aCoinDepth.compareTo(bCoinDepth) < 0)
return 1;
else if (bCoinDepth.compareTo(aCoinDepth) < 0)
return -1;
// The "coin*days" destroyed are equal, sort by value alone to get the lowest transaction size
// (ie sort by reverse depth)
if (depth1 < depth2)
return -1;
else if (depth2 < depth1)
return 1;
// They are entirely equivalent (possibly pending) so sort by hash to ensure a total ordering.
BigInteger aHash = a.parentTransaction.getHash().toBigInteger();
BigInteger bHash = b.parentTransaction.getHash().toBigInteger();
return aHash.compareTo(bHash);
}
});
if (!biTarget.equals(NetworkParameters.MAX_MONEY)) {
Collections.sort(sortedOutputs, new Comparator<TransactionOutput>() {
public int compare(TransactionOutput a, TransactionOutput b) {
int depth1 = 0;
int depth2 = 0;
TransactionConfidence conf1 = a.parentTransaction.getConfidence();
TransactionConfidence conf2 = b.parentTransaction.getConfidence();
if (conf1.getConfidenceType() == ConfidenceType.BUILDING) depth1 = conf1.getDepthInBlocks();
if (conf2.getConfidenceType() == ConfidenceType.BUILDING) depth2 = conf2.getDepthInBlocks();
BigInteger aCoinDepth = a.getValue().multiply(BigInteger.valueOf(depth1));
BigInteger bCoinDepth = b.getValue().multiply(BigInteger.valueOf(depth2));
if (aCoinDepth.compareTo(bCoinDepth) < 0)
return 1;
else if (bCoinDepth.compareTo(aCoinDepth) < 0)
return -1;
// The "coin*days" destroyed are equal, sort by value alone to get the lowest transaction size
// (ie sort by reverse depth)
if (depth1 < depth2)
return -1;
else if (depth2 < depth1)
return 1;
// They are entirely equivalent (possibly pending) so sort by hash to ensure a total ordering.
BigInteger aHash = a.parentTransaction.getHash().toBigInteger();
BigInteger bHash = b.parentTransaction.getHash().toBigInteger();
return aHash.compareTo(bHash);
}
});
}
// Now iterate over the sorted outputs until we have got as close to the target as possible or a little
// bit over (excessive value will be change).
for (TransactionOutput output : sortedOutputs) {