Package com.qfs.multiversion

Interface IEpochManager

All Known Subinterfaces:

IAdvancedEpochManager

All Known Implementing Classes:

AEpochManager, DistributedEpochManager, EpochManager

public interface IEpochManager

User interface for versions management of all components.

Author:

ActiveViam

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	IEpochManager.IVersionLifecycleHandler<V extends IVersion>	Handler containing callbacks for the different events triggered during a version's lifecycle.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	IDENTIFIER	Statistic identifier.

Method Summary

Modifier and Type	Method	Description
<V extends ISquashableVersion<V>> IVersionHistory<V>	createVersionHistory(boolean root, IHasId forComponent, IEpochManager.IVersionLifecycleHandler<V> historyLifecycle)	Creates a version history that works accordingly to the epoch management policy of this epoch manager.
void	discard()	Cleans up resources that are only reachable by versions that do not exist anymore.
void	forceDiscardEpochs(Predicate<IHistoryNode> predicate)	Iterates over all the released epochs in each history of this epoch manager and forces the discard of the epochs for which the predicate returns true.
Set<String>	getBranches()	Gets the names of the branches.
Map<String,? extends IEpochHistory>	getHistories()	Gets the underlying histories indexed by their ids.
IEpochHistory	getRootHistory()	Gets the root history.
void	releaseBranch(String branch)	Releases all the epochs of the given branch.
void	releaseEpochs(String branch, long from, long to)	Releases a range of epochs.
void	releaseHistory(String id)	Removes an IEpochHistory from the existing list of histories stored by the epoch manager.

Field Details

IDENTIFIER

static final String IDENTIFIER

Statistic identifier.

See Also:

• Constant Field Values

Method Details

releaseHistory

void releaseHistory(String id)

Removes an IEpochHistory from the existing list of histories stored by the epoch manager.

Parameters:

id - the component whose history should be removed

See Also:

• IEpochHistory.getMultiVersionId()

releaseEpochs

void releaseEpochs(String branch,
 long from,
 long to)
            throws IllegalArgumentException

Releases a range of epochs.

Parameters:

branch - the branch of the versions to release

from - the lower bound of the range, included in the deletion

to - the upper bound of the range, also included in the deletion

Throws:

IllegalArgumentException - if trying to release the latest epoch (i.e. when to >= currentEpoch, with currentEpoch = #getCurrentEpoch())

See Also:

• IEpochHistory.releaseEpochs(String, long, long)

getBranches

Set<String> getBranches()

Gets the names of the branches.

Returns:

the names of the branches

releaseBranch

void releaseBranch(String branch)

Releases all the epochs of the given branch.

Parameters:

branch - any branch but the main

See Also:

• IEpoch.MASTER_BRANCH_NAME

getRootHistory

IEpochHistory getRootHistory()

Gets the root history. The root history is the single history whose versions are followed by other histories.

Returns:

the root history

getHistories

Map<String,? extends IEpochHistory> getHistories()

Gets the underlying histories indexed by their ids.

createVersionHistory

<V extends ISquashableVersion<V>>
IVersionHistory<V> createVersionHistory(boolean root,
 IHasId forComponent,
 IEpochManager.IVersionLifecycleHandler<V> historyLifecycle)

Creates a version history that works accordingly to the epoch management policy of this epoch manager.

Type Parameters:

V - the type of versions stored in this history

Parameters:

root - indicates if this history is the root version history among all histories created by this creator, the root history is the single history whose versions are followed by other histories

forComponent - the multiversion whose versions are managed by the new version history

historyLifecycle - lifecycle callbacks for this version history

Returns:

version history

discard

void discard()

Cleans up resources that are only reachable by versions that do not exist anymore.

forceDiscardEpochs

void forceDiscardEpochs(Predicate<IHistoryNode> predicate)

Iterates over all the released epochs in each history of this epoch manager and forces the discard of the epochs for which the predicate returns true.

This call will also perform a normal discard().

Parameters:

predicate - the predicate that will select the epoch to discard