Package bftsmart.statemanagement.durability

Class CSTState

java.lang.Object

bftsmart.statemanagement.durability.CSTState

All Implemented Interfaces:

ApplicationState, java.io.Serializable

public class CSTState
extends java.lang.Object
implements ApplicationState

Stores the data used to transfer the state to a recovering replica. This class serves the three different seeders defined in the CST optimized version for f=1. In that version, the newest replica to take the checkpoint is expected to send the hash of the checkpoint plus the upper portion of the log. The replica which took the checkpoint before that, i.e., the middle replica is expected to send the checkpoint it has plus hashes of the lower and upper portions of the log. The oldest replica to take the checkpoint must send the lower portion of the log. This object must be passed to the state manager class which will combine the replies from the seeders, validating the values and updating the state in the leecher.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
CSTState(byte[] state, byte[] hashCheckpoint, CommandsInfo[] logLower, byte[] hashLogLower, CommandsInfo[] logUpper, byte[] hashLogUpper, int checkpointCID, int lastCID, int pid)

Method Summary

Modifier and Type	Method	Description
CertifiedDecision	getCertifiedDecision(ServerViewController controller)	Retrieves the certified decision for the last consensus present in this object
int	getCheckpointCID()
byte[]	getHashCheckpoint()
byte[]	getHashLogLower()
byte[]	getHashLogUpper()
int	getLastCID()	The consensus of the last batch of commands which the application was given
CommandsInfo[]	getLogLower()
CommandsInfo[]	getLogUpper()
CommandsInfo	getMessageBatch(int cid)	Retrieves the specified batch of messages
byte[]	getSerializedState()	Byte array that must be a representation of the application state
byte[]	getStateHash()	Gets an secure hash of the application state
boolean	hasState()	Indicates if the sender replica had the state requested by the recovering replica
void	setSerializedState(byte[] state)	Sets a byte array that must be a representation of the application state

Methods inherited from class java.lang.Object

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

Methods inherited from interface bftsmart.statemanagement.ApplicationState

equals, hashCode

Constructor Detail

CSTState

public CSTState(byte[] state,
                byte[] hashCheckpoint,
                CommandsInfo[] logLower,
                byte[] hashLogLower,
                CommandsInfo[] logUpper,
                byte[] hashLogUpper,
                int checkpointCID,
                int lastCID,
                int pid)

Method Detail

hasState

public boolean hasState()

Description copied from interface: ApplicationState

Indicates if the sender replica had the state requested by the recovering replica

Specified by:

hasState in interface ApplicationState

Returns:

true if the sender replica had the state requested by the recovering replica, false otherwise

getSerializedState

public byte[] getSerializedState()

Description copied from interface: ApplicationState

Byte array that must be a representation of the application state

Specified by:

getSerializedState in interface ApplicationState

Returns:

A byte array that must be a representation of the application state

getStateHash

public byte[] getStateHash()

Description copied from interface: ApplicationState

Gets an secure hash of the application state

Specified by:

getStateHash in interface ApplicationState

Returns:

Secure hash of the application state

setSerializedState

public void setSerializedState(byte[] state)

Description copied from interface: ApplicationState

Sets a byte array that must be a representation of the application state

Specified by:

setSerializedState in interface ApplicationState

Parameters:

state - a byte array that must be a representation of the application state

getLastCID

public int getLastCID()

Description copied from interface: ApplicationState

The consensus of the last batch of commands which the application was given

Specified by:

getLastCID in interface ApplicationState

Returns:

consensus of the last batch of commands which the application was given

getCertifiedDecision

public CertifiedDecision getCertifiedDecision(ServerViewController controller)

Retrieves the certified decision for the last consensus present in this object

Specified by:

getCertifiedDecision in interface ApplicationState

Parameters:

controller -

Returns:

The certified decision for the last consensus present in this object

getCheckpointCID

public int getCheckpointCID()

getMessageBatch

public CommandsInfo getMessageBatch(int cid)

Retrieves the specified batch of messages

Parameters:

cid - Consensus ID associated with the batch to be fetched

Returns:

The batch of messages associated with the batch correspondent consensus ID

getHashLogUpper

public byte[] getHashLogUpper()

getHashLogLower

public byte[] getHashLogLower()

getLogUpper

public CommandsInfo[] getLogUpper()

getLogLower

public CommandsInfo[] getLogLower()

getHashCheckpoint

public byte[] getHashCheckpoint()