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core/src/main/java/org/bitcoinj/wallet/selector/SmallestValueCoinSelector.java
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|---|---|---|
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| /* | ||
| * Copyright by the original author or authors. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package org.bitcoinj.wallet.selector; | ||
|
|
||
| import com.google.common.annotations.VisibleForTesting; | ||
| import org.bitcoinj.core.*; | ||
| import org.bitcoinj.wallet.CoinSelection; | ||
|
|
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| import java.math.BigInteger; | ||
| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.Comparator; | ||
| import java.util.List; | ||
|
|
||
| /** | ||
| * This class implements a {@link CoinSelector} which attempts to get the highest priority | ||
| * possible. This means that the transaction is the most likely to get confirmed. Note that this means we may end up | ||
| * "spending" more priority than would be required to get the transaction we are creating confirmed. | ||
| */ | ||
| public class SmallestValueCoinSelector implements CoinSelector { | ||
| protected SmallestValueCoinSelector() { | ||
| } | ||
|
|
||
| @Override | ||
| public CoinSelection select(Coin target, List<TransactionOutput> candidates) { | ||
| ArrayList<TransactionOutput> selected = new ArrayList<>(); | ||
| // 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<>(candidates); | ||
| // When calculating the wallet balance, we may be asked to select all possible coins, if so, avoid sorting | ||
| // them in order to improve performance. | ||
| // TODO: Take in network parameters when instanatiated, and then test against the current network. Or just have a boolean parameter for "give me everything" | ||
| if (!target.equals(NetworkParameters.MAX_MONEY)) { | ||
| sortOutputs(sortedOutputs); | ||
| } | ||
| // 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). | ||
| long total = 0; | ||
| for (TransactionOutput output : sortedOutputs) { | ||
| if (total >= target.value) break; | ||
| // Only pick chain-included transactions, or transactions that are ours and pending. | ||
| if (!shouldSelect(output.getParentTransaction())) continue; | ||
| selected.add(output); | ||
| total += output.getValue().value; | ||
| } | ||
| // Total may be lower than target here, if the given candidates were insufficient to create to requested | ||
| // transaction. | ||
| return new CoinSelection(Coin.valueOf(total), selected); | ||
| } | ||
|
|
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| @VisibleForTesting | ||
| public static void sortOutputs(ArrayList<TransactionOutput> outputs) { | ||
| Collections.sort(outputs, new Comparator<TransactionOutput>() { | ||
| @Override | ||
| public int compare(TransactionOutput a, TransactionOutput b) { | ||
| Coin aValue = a.getValue(); | ||
| Coin bValue = b.getValue(); | ||
| int c2 = aValue.compareTo(bValue); | ||
| if (c2 != 0) return c2; | ||
| // They are entirely equivalent (possibly pending) so sort by hash to ensure a total ordering. | ||
| BigInteger aHash = a.getParentTransactionHash().toBigInteger(); | ||
| BigInteger bHash = b.getParentTransactionHash().toBigInteger(); | ||
| return aHash.compareTo(bHash); | ||
| } | ||
| }); | ||
| } | ||
|
|
||
| /** | ||
| * Sub-classes can override this to just customize whether transactions are usable, but keep age sorting. | ||
| */ | ||
| protected boolean shouldSelect(Transaction tx) { | ||
| if (tx != null) { | ||
| return isSelectable(tx); | ||
| } | ||
| return true; | ||
| } | ||
|
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| public static boolean isSelectable(Transaction tx) { | ||
| // Only pick chain-included transactions, or transactions that are ours and pending. | ||
| TransactionConfidence confidence = tx.getConfidence(); | ||
| TransactionConfidence.ConfidenceType type = confidence.getConfidenceType(); | ||
| return type.equals(TransactionConfidence.ConfidenceType.BUILDING) || | ||
|
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| type.equals(TransactionConfidence.ConfidenceType.PENDING) && | ||
| confidence.getSource().equals(TransactionConfidence.Source.SELF) && | ||
| // In regtest mode we expect to have only one peer, so we won't see transactions propagate. | ||
| (confidence.numBroadcastPeers() > 0 || tx.getParams().getId().equals(NetworkParameters.ID_REGTEST)); | ||
| } | ||
|
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| private static SmallestValueCoinSelector instance; | ||
|
|
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| /** | ||
| * Returns a global static instance of the selector. | ||
| */ | ||
| public static SmallestValueCoinSelector get() { | ||
| // This doesn't have to be thread safe as the object has no state, so discarded duplicates are | ||
| // harmless. | ||
| if (instance == null) | ||
| instance = new SmallestValueCoinSelector(); | ||
| return instance; | ||
| } | ||
| } |
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