org.opendaylight.controller.cluster.raft

Class AbstractReplicatedLogImpl

java.lang.Object

org.opendaylight.controller.cluster.raft.AbstractReplicatedLogImpl

All Implemented Interfaces:

ReplicatedLog

public abstract class AbstractReplicatedLogImpl
extends Object
implements ReplicatedLog

Abstract class handling the mapping of logical LogEntry Index and the physical list index.

Field Summary

Fields inherited from interface org.opendaylight.controller.cluster.raft.ReplicatedLog

NO_MAX_SIZE

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractReplicatedLogImpl()
protected	AbstractReplicatedLogImpl(long snapshotIndex, long snapshotTerm, List<ReplicatedLogEntry> unAppliedEntries, String logContext)

Method Summary

Modifier and Type	Method and Description
protected int	adjustedIndex(long logEntryIndex)
boolean	append(ReplicatedLogEntry replicatedLogEntry) Appends an entry to the log.
void	clear(int startIndex, int endIndex) Clears the journal entries with startIndex (inclusive) and endIndex (exclusive).
int	dataSize() Returns the size of the data in the log (in bytes).
ReplicatedLogEntry	get(long logEntryIndex) Return the replicated log entry at the specified index.
List<ReplicatedLogEntry>	getFrom(long logEntryIndex) Returns a list of log entries starting from the given index to the end of the log.
List<ReplicatedLogEntry>	getFrom(long logEntryIndex, int maxEntries, long maxDataSize) Returns a list of log entries starting from the given index up to the given maximum of entries or the given maximum accumulated size, whichever comes first.
long	getSnapshotIndex() Returns the index of the snapshot.
long	getSnapshotTerm() Returns the term of the snapshot.
void	increaseJournalLogCapacity(int amount) Optimization method to increase the capacity of the journal log prior to appending entries.
boolean	isInSnapshot(long logEntryIndex) Checks if the entry is present in a snapshot.
boolean	isPresent(long logEntryIndex) Checks if the entry at the specified index is present or not.
ReplicatedLogEntry	last() Return the last replicated log entry in the log or null of not found.
long	lastIndex() Return the index of the last entry in the log or -1 if the log is empty.
long	lastTerm() Return the term of the last entry in the log or -1 if the log is empty.
long	removeFrom(long logEntryIndex) Removes entries from the in-memory log starting at the given index.
void	setSnapshotIndex(long snapshotIndex) Sets the snapshot index in the replicated log.
void	setSnapshotTerm(long snapshotTerm) Sets snapshot term.
long	size() Returns the number of entries in the journal.
void	snapshotCommit() Sets the Replicated log to state after snapshot success.
void	snapshotPreCommit(long snapshotCapturedIndex, long snapshotCapturedTerm) Handles all the bookkeeping in order to perform a rollback in the event of SaveSnapshotFailure.
void	snapshotRollback() Restores the replicated log to a state in the event of a save snapshot failure.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.opendaylight.controller.cluster.raft.ReplicatedLog

appendAndPersist, captureSnapshotIfReady, removeFromAndPersist, shouldCaptureSnapshot

Constructor Detail

AbstractReplicatedLogImpl

protected AbstractReplicatedLogImpl(long snapshotIndex,
                                    long snapshotTerm,
                                    List<ReplicatedLogEntry> unAppliedEntries,
                                    String logContext)

AbstractReplicatedLogImpl

protected AbstractReplicatedLogImpl()

Method Detail

adjustedIndex

protected int adjustedIndex(long logEntryIndex)

get

public ReplicatedLogEntry get(long logEntryIndex)

Description copied from interface: ReplicatedLog

Return the replicated log entry at the specified index.

Specified by:

get in interface ReplicatedLog

Parameters:

logEntryIndex - the index of the log entry

Returns:

the ReplicatedLogEntry if found, otherwise null if the adjusted index less than 0 or greater than the size of the in-memory journal

last

public ReplicatedLogEntry last()

Description copied from interface: ReplicatedLog

Return the last replicated log entry in the log or null of not found.

Specified by:

last in interface ReplicatedLog

Returns:

the last replicated log entry in the log or null of not found.

lastIndex

public long lastIndex()

Description copied from interface: ReplicatedLog

Return the index of the last entry in the log or -1 if the log is empty.

Specified by:

lastIndex in interface ReplicatedLog

Returns:

the index of the last entry in the log or -1 if the log is empty.

lastTerm

public long lastTerm()

Description copied from interface: ReplicatedLog

Return the term of the last entry in the log or -1 if the log is empty.

Specified by:

lastTerm in interface ReplicatedLog

Returns:

the term of the last entry in the log or -1 if the log is empty.

removeFrom

public long removeFrom(long logEntryIndex)

Description copied from interface: ReplicatedLog

Removes entries from the in-memory log starting at the given index.

Specified by:

removeFrom in interface ReplicatedLog

Parameters:

logEntryIndex - the index of the first log entry to remove

Returns:

the adjusted index of the first log entry removed or -1 if the log entry is not found.

append

public boolean append(ReplicatedLogEntry replicatedLogEntry)

Description copied from interface: ReplicatedLog

Appends an entry to the log.

Specified by:

append in interface ReplicatedLog

Parameters:

replicatedLogEntry - the entry to append

Returns:

true if the entry was successfully appended, false otherwise. An entry can fail to append if the index is already included in the log.

increaseJournalLogCapacity

public void increaseJournalLogCapacity(int amount)

Description copied from interface: ReplicatedLog

Optimization method to increase the capacity of the journal log prior to appending entries.

Specified by:

increaseJournalLogCapacity in interface ReplicatedLog

Parameters:

amount - the amount to increase by

getFrom

public List<ReplicatedLogEntry> getFrom(long logEntryIndex)

Description copied from interface: ReplicatedLog

Returns a list of log entries starting from the given index to the end of the log.

Specified by:

getFrom in interface ReplicatedLog

Parameters:

logEntryIndex - the index of the first log entry to get.

Returns:

the List of entries

getFrom

public List<ReplicatedLogEntry> getFrom(long logEntryIndex,
                                        int maxEntries,
                                        long maxDataSize)

Description copied from interface: ReplicatedLog

Returns a list of log entries starting from the given index up to the given maximum of entries or the given maximum accumulated size, whichever comes first.

Specified by:

getFrom in interface ReplicatedLog

Parameters:

logEntryIndex - the index of the first log entry to get

maxEntries - the maximum number of entries to get

maxDataSize - the maximum accumulated size of the log entries to get

Returns:

the List of entries meeting the criteria.

size

public long size()

Description copied from interface: ReplicatedLog

Returns the number of entries in the journal.

Specified by:

size in interface ReplicatedLog

Returns:

the number of entries

dataSize

public int dataSize()

Description copied from interface: ReplicatedLog

Returns the size of the data in the log (in bytes).

Specified by:

dataSize in interface ReplicatedLog

Returns:

the size of the data in the log (in bytes)

isPresent

public boolean isPresent(long logEntryIndex)

Description copied from interface: ReplicatedLog

Checks if the entry at the specified index is present or not.

Specified by:

isPresent in interface ReplicatedLog

Parameters:

logEntryIndex - the index of the log entry

Returns:

true if the entry is present in the in-memory journal

isInSnapshot

public boolean isInSnapshot(long logEntryIndex)

Description copied from interface: ReplicatedLog

Checks if the entry is present in a snapshot.

Specified by:

isInSnapshot in interface ReplicatedLog

Parameters:

logEntryIndex - the index of the log entry

Returns:

true if the entry is in the snapshot. false if the entry is not in the snapshot even if the entry may be present in the replicated log

getSnapshotIndex

public long getSnapshotIndex()

Description copied from interface: ReplicatedLog

Returns the index of the snapshot.

Specified by:

getSnapshotIndex in interface ReplicatedLog

Returns:

the index from which the snapshot was created. -1 otherwise.

getSnapshotTerm

public long getSnapshotTerm()

Description copied from interface: ReplicatedLog

Returns the term of the snapshot.

Specified by:

getSnapshotTerm in interface ReplicatedLog

Returns:

the term of the index from which the snapshot was created. -1 otherwise

setSnapshotIndex

public void setSnapshotIndex(long snapshotIndex)

Description copied from interface: ReplicatedLog

Sets the snapshot index in the replicated log.

Specified by:

setSnapshotIndex in interface ReplicatedLog

Parameters:

snapshotIndex - the index to set

setSnapshotTerm

public void setSnapshotTerm(long snapshotTerm)

Description copied from interface: ReplicatedLog

Sets snapshot term.

Specified by:

setSnapshotTerm in interface ReplicatedLog

Parameters:

snapshotTerm - the term to set

clear

public void clear(int startIndex,
                  int endIndex)

Description copied from interface: ReplicatedLog

Clears the journal entries with startIndex (inclusive) and endIndex (exclusive).

Specified by:

clear in interface ReplicatedLog

Parameters:

startIndex - the start index (inclusive)

endIndex - the end index (exclusive)

snapshotPreCommit

public void snapshotPreCommit(long snapshotCapturedIndex,
                              long snapshotCapturedTerm)

Description copied from interface: ReplicatedLog

Handles all the bookkeeping in order to perform a rollback in the event of SaveSnapshotFailure.

Specified by:

snapshotPreCommit in interface ReplicatedLog

Parameters:

snapshotCapturedIndex - the new snapshot index

snapshotCapturedTerm - the new snapshot term

snapshotCommit

public void snapshotCommit()

Description copied from interface: ReplicatedLog

Sets the Replicated log to state after snapshot success.

Specified by:

snapshotCommit in interface ReplicatedLog

snapshotRollback

public void snapshotRollback()

Description copied from interface: ReplicatedLog

Restores the replicated log to a state in the event of a save snapshot failure.

Specified by:

snapshotRollback in interface ReplicatedLog