org.neo4j.kernel.ha

Class TransactionChecksumLookup

java.lang.Object

org.neo4j.kernel.ha.TransactionChecksumLookup

All Implemented Interfaces:

org.neo4j.function.primitive.FunctionFromPrimitiveLongToPrimitiveLong<IOException>

public class TransactionChecksumLookup
extends Object
implements org.neo4j.function.primitive.FunctionFromPrimitiveLongToPrimitiveLong<IOException>

Transaction meta data can normally be looked up using LogicalTransactionStore.getMetadataFor(long). The exception to that is when there are no transaction logs for the database, for example after a migration and we're looking up the checksum for transaction the migration was performed at. In that case we have to extract that checksum directly from TransactionIdStore, since it's not in any transaction log, at least not at the time of writing this class.

Constructor Summary

Constructors

Constructor and Description
TransactionChecksumLookup(org.neo4j.kernel.impl.transaction.log.TransactionIdStore transactionIdStore, org.neo4j.kernel.impl.transaction.log.LogicalTransactionStore logicalTransactionStore)

Method Summary

Methods

Modifier and Type	Method and Description
long	apply(long txId)

Methods inherited from class java.lang.Object

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

Constructor Detail

TransactionChecksumLookup

public TransactionChecksumLookup(org.neo4j.kernel.impl.transaction.log.TransactionIdStore transactionIdStore,
                         org.neo4j.kernel.impl.transaction.log.LogicalTransactionStore logicalTransactionStore)

Method Detail

apply

public long apply(long txId)
           throws IOException

Specified by:

apply in interface org.neo4j.function.primitive.FunctionFromPrimitiveLongToPrimitiveLong<IOException>

Throws:

IOException