awol

Documentation

Index

• Constants
• type Log
  • func New() Log
  • func Open() Log
  • func (l Log) Apply()
  • func (l Log) BeginTxn() bool
  • func (l Log) Commit()
  • func (l Log) Read(a uint64) disk.Block
  • func (l Log) Size() uint64
  • func (l Log) Write(a uint64, v disk.Block)

Constants

const MaxTxnWrites uint64 = 10 // 10 is completely arbitrary

MaxTxnWrites is a guaranteed reservation for each transaction.

Types

type Log

type Log struct {
	// contains filtered or unexported fields
}

func New

func New() Log

New initializes a fresh log

func Open

func Open() Log

Open recovers the log following a crash or shutdown

func (Log) Apply

func (l Log) Apply()

Apply all the committed transactions.

Frees all the space in the log.

func (Log) BeginTxn

func (l Log) BeginTxn() bool

BeginTxn allocates space for a new transaction in the log.

Returns true if the allocation succeeded.

func (Log) Commit

func (l Log) Commit()

Commit the current transaction.

func (Log) Read

func (l Log) Read(a uint64) disk.Block

Read from the logical disk.

Reads must go through the log to return committed but un-applied writes.

func (Log) Size

func (l Log) Size() uint64

func (Log) Write

func (l Log) Write(a uint64, v disk.Block)

Write to the disk through the log.