Package io.permazen.kv.mvcc

Utility classes for MVCC type operations using a KVStore.

Interface Summary

Interface	Description
AtomicKVStore	Extension of the KVStore interface for implementations that support atomic, batched reads and writes.
Mutations	Represents a set of mutations that can be applied to a KVStore.
ReadTracking	Implemented by KVStore's that are capable of tracking which keys have been read.

Class Summary

Class	Description
AtomicKVDatabase	Wrapper class that presents an AtomicKVStore view of a KVDatabase, using individual transactions for each operation.
Conflict	Represents an MVCC conflict.
LockManager	Manager of read/write locks on byte[] key ranges that ensures isolation and serialization while allowing concurrent access by multiple threads to a single underlying byte[] key/value store.
LockOwner	Represents the owner of a Lock managed by a LockManager.
MutableView	Provides a mutable view of an underlying, read-only KVStore.
ReadAdjustConflict	Represents an MVCC conflict in which a key that was read in one transaction was adjusted via KVStore.adjustCounter() in another, simultaneous transaction.
ReadRemoveConflict	Represents an MVCC conflict in which a key or range of keys that was read in one transaction was removed in another, simultaneous transaction.
Reads	Holds a set of reads from a KVStore.
ReadWriteConflict	Represents an MVCC conflict in which a key that was read in one transaction had its value changed in another, simultaneous transaction.
SnapshotKVDatabase	KVDatabase implementation based on an underlying AtomicKVStore that uses snapshot views and optimistic locking to provide concurrent transactions and linearizable ACID consistency.
SnapshotKVTransaction	SnapshotKVDatabase transaction.
SnapshotRefs	Holds a count of references to a CloseableKVStore and actually close()'s it when the reference count reaches zero.
Writes	Holds a set of writes to a KVStore.

Enum Summary

Enum	Description
LockManager.LockResult	Possible return values from LockManager.lock().

Exception Summary

Exception	Description
TransactionConflictException	Exception thrown when a transaction fails because of an MVCC conflict.