Package com.palantir.atlasdb.transaction.api

Class NoOpTransactionLockWatchingCacheView

java.lang.Object

com.palantir.atlasdb.transaction.api.NoOpTransactionLockWatchingCacheView

All Implemented Interfaces:

TransactionLockWatchingCacheView

public final class NoOpTransactionLockWatchingCacheView
extends Object
implements TransactionLockWatchingCacheView

Field Summary

Fields

Modifier and Type	Field	Description
static NoOpTransactionLockWatchingCacheView	INSTANCE

Method Summary

Modifier and Type	Method	Description
Map<Cell,byte[]>	readCached(TableReference tableRef, Set<Cell> cells)	Attempts to read the cached versions of cells.
void	tryCacheNewValuesRead(TableReference tableRef, Map<Cell,byte[]> writes, com.palantir.lock.watch.LockWatchStateUpdate lwState)	Try to cache values read from the kvs in this transaction.
void	tryCacheWrittenValues(TableReference tableRef, Map<Cell,byte[]> writes, long lockTs)	Try to cache values written to the kvs in this transaction.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final NoOpTransactionLockWatchingCacheView INSTANCE

Method Detail

readCached

public Map<Cell,byte[]> readCached(TableReference tableRef,
                                         Set<Cell> cells)

Description copied from interface: TransactionLockWatchingCacheView

Attempts to read the cached versions of cells. If there is no suitable cached value for the cell, it will not be present in the returned map.

Specified by:

readCached in interface TransactionLockWatchingCacheView

Parameters:

tableRef - table to read from

cells - cells to read

Returns:

a mapping with all cells that were cached and guaranteed to be equal to what the transaction would have read from the kvs.

tryCacheNewValuesRead

public void tryCacheNewValuesRead(TableReference tableRef,
                                  Map<Cell,byte[]> writes,
                                  com.palantir.lock.watch.LockWatchStateUpdate lwState)

Description copied from interface: TransactionLockWatchingCacheView

Try to cache values read from the kvs in this transaction. It is the responsibility of the underlying LockWatchingCache to arbitrate which, if any, values should be cached.

Specified by:

tryCacheNewValuesRead in interface TransactionLockWatchingCacheView

Parameters:

tableRef - table we read from

writes - entries read from the KVS

lwState - lock watch state when the view was created

tryCacheWrittenValues

public void tryCacheWrittenValues(TableReference tableRef,
                                  Map<Cell,byte[]> writes,
                                  long lockTs)

Description copied from interface: TransactionLockWatchingCacheView

Try to cache values written to the kvs in this transaction. This method must be called only after the writing transaction has successfully committed. It is the responsibility of the underlying LockWatchingCache to arbitrate which, if any, values should be cached.

Specified by:

tryCacheWrittenValues in interface TransactionLockWatchingCacheView

Parameters:

tableRef - table we wrote to

writes - entries written to the KVS

lockTs - lock timestamp of the TimestampedLockResponse from acquiring locks