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23 changes: 23 additions & 0 deletions
23
src/main/java/com/iota/iri/service/solidifier/TransactionSolidifier.java
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| package com.iota.iri.service.solidifier; | ||
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| /** | ||
| * The {@link TransactionSolidifier} continuously tries to solidify transactions. | ||
| */ | ||
| public interface TransactionSolidifier { | ||
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| /** | ||
| * Starts the background worker that continuously tries to solidify transactions. | ||
| */ | ||
| void start(); | ||
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| /** | ||
| * Solidifies transactions. Which transactions and how are getting solidified is an implementation detail. | ||
| */ | ||
| void solidify(); | ||
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| /** | ||
| * Stops the background worker that continuously solidifies transactions. | ||
| */ | ||
| void shutdown(); | ||
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| } |
121 changes: 121 additions & 0 deletions
121
src/main/java/com/iota/iri/service/solidifier/impl/QuickTransactionSolidifier.java
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| package com.iota.iri.service.solidifier.impl; | ||
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| import com.iota.iri.TransactionValidator; | ||
| import com.iota.iri.conf.SolidificationConfig; | ||
| import com.iota.iri.controllers.MilestoneViewModel; | ||
| import com.iota.iri.controllers.TransactionViewModel; | ||
| import com.iota.iri.service.milestone.LatestMilestoneTracker; | ||
| import com.iota.iri.service.snapshot.SnapshotProvider; | ||
| import com.iota.iri.service.solidifier.TransactionSolidifier; | ||
| import com.iota.iri.storage.Tangle; | ||
| import com.iota.iri.utils.dag.DAGHelper; | ||
| import com.iota.iri.utils.thread.DedicatedScheduledExecutorService; | ||
| import com.iota.iri.utils.thread.SilentScheduledExecutorService; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| import java.util.concurrent.TimeUnit; | ||
| import java.util.concurrent.atomic.AtomicInteger; | ||
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| /** | ||
| * The {@link QuickTransactionSolidifier} starts at the defined depth parameter to walk up the graph towards the tips | ||
| * and executes the {@link TransactionValidator#quietQuickSetSolid(TransactionViewModel)} on each traversed transaction. | ||
| */ | ||
| public class QuickTransactionSolidifier implements TransactionSolidifier { | ||
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| private static final Logger log = LoggerFactory.getLogger(QuickTransactionSolidifier.class); | ||
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| private final SilentScheduledExecutorService executorService = new DedicatedScheduledExecutorService( | ||
| "Quick Transaction Solidifier", log); | ||
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| // external | ||
| private SolidificationConfig solidificationConfig; | ||
| private Tangle tangle; | ||
| private SnapshotProvider snapshotProvider; | ||
| private LatestMilestoneTracker latestMilestoneTracker; | ||
| private TransactionValidator transactionValidator; | ||
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| /** | ||
| * <p> | ||
| * This method initializes the instance and registers its dependencies. | ||
| * </p> | ||
| * <p> | ||
| * It simply stores the passed in values in their corresponding private properties. | ||
| * </p> | ||
| * <p> | ||
| * Note: Instead of handing over the dependencies in the constructor, we register them lazy. This allows us to have | ||
| * circular dependencies because the instantiation is separated from the dependency injection. To reduce the | ||
| * amount of code that is necessary to correctly instantiate this class, we return the instance itself which | ||
| * allows us to still instantiate, initialize and assign in one line - see Example: | ||
| * </p> | ||
| * {@code quickTransactionSolidifier = new QuickTransactionSolidifier().init(...);} | ||
| * | ||
| * @param solidificationConfig the configuration holding parameters for solidification | ||
| * @param tangle Tangle object which acts as a database interface | ||
| * @param snapshotProvider data provider for the snapshots that are relevant for the node | ||
| * @param latestMilestoneTracker the tracker holding the latest known milestone index | ||
| * @param transactionValidator the TransactionValidator which holds the logic for checking quick solidification | ||
| * @return the initialized instance itself to allow chaining | ||
| */ | ||
| public QuickTransactionSolidifier init(SolidificationConfig solidificationConfig, Tangle tangle, SnapshotProvider snapshotProvider, | ||
| LatestMilestoneTracker latestMilestoneTracker, TransactionValidator transactionValidator) { | ||
| this.solidificationConfig = solidificationConfig; | ||
| this.tangle = tangle; | ||
| this.snapshotProvider = snapshotProvider; | ||
| this.latestMilestoneTracker = latestMilestoneTracker; | ||
| this.transactionValidator = transactionValidator; | ||
| return this; | ||
| } | ||
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| @Override | ||
| public void start() { | ||
| executorService.silentScheduleWithFixedDelay(this::solidify, 0, | ||
| solidificationConfig.getSolidifierIntervalMillisec(), TimeUnit.MILLISECONDS); | ||
| } | ||
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| @Override | ||
| public void solidify() { | ||
| // we only try to quick solidify transactions when we are not synchronized and below the depth of the | ||
| // quick solidification parameter | ||
| int latestMilestoneIndex = latestMilestoneTracker.getLatestMilestoneIndex(); | ||
| int depth = solidificationConfig.getSolidifierDepth(); | ||
| if (latestMilestoneIndex - depth <= 0 | ||
| || snapshotProvider.getLatestSnapshot().getIndex() < latestMilestoneIndex - depth) { | ||
| return; | ||
| } | ||
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| DAGHelper dagHelper = DAGHelper.get(tangle); | ||
| long start = System.currentTimeMillis(); | ||
| try { | ||
| MilestoneViewModel milestone = MilestoneViewModel.get(tangle, latestMilestoneIndex - depth); | ||
| // if we don't have the milestone which we wanted to use as a starting point, we simply don't run. | ||
| if (milestone == null) { | ||
| return; | ||
| } | ||
| AtomicInteger updated = new AtomicInteger(); | ||
| AtomicInteger traversed = new AtomicInteger(); | ||
| dagHelper.traverseApprovers(milestone.getHash(), tvm -> !Thread.currentThread().isInterrupted(), tvm -> { | ||
| try { | ||
| if (transactionValidator.quietQuickSetSolid(tvm)) { | ||
| tvm.update(tangle, snapshotProvider.getInitialSnapshot(), "solid|height"); | ||
| updated.incrementAndGet(); | ||
| } | ||
| traversed.incrementAndGet(); | ||
| } catch (Exception e) { | ||
| log.error("error while trying to quick set solid transaction {}. reason: {}", tvm.getHash(), | ||
| e.getMessage()); | ||
| } | ||
| }); | ||
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| log.info("updated {} and traversed {} transactions, took {} ms", updated.get(), traversed.get(), | ||
| System.currentTimeMillis() - start); | ||
| } catch (Exception e) { | ||
| log.error("error occurred during quick solidification run: {}", e.getMessage()); | ||
| } | ||
| } | ||
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| @Override | ||
| public void shutdown() { | ||
| executorService.shutdownNow(); | ||
| } | ||
| } |