com.tangosol.persistence

Class AbstractSnapshotArchiver

java.lang.Object

com.tangosol.persistence.AbstractSnapshotArchiver

All Implemented Interfaces:

SnapshotArchiver

Direct Known Subclasses:

DirectorySnapshotArchiver

public abstract class AbstractSnapshotArchiver
extends Object
implements SnapshotArchiver

An abstract implementation of a SnapshotArchiver which must be extended to create a specific implementation.

Since:

12.2.1

Author:

tam 2014.08.22

Field Summary

Fields

Modifier and Type	Field and Description
protected String	f_sClusterName The cluster name.
protected String	f_sServiceName The service name.
protected long	m_cMillisLastStart The start time of the last operation.
protected long	m_cMillisMax The maxiumum time in millis to archive or retrieve a snapshot store.
protected long	m_cMillisMin The minimum time in millis to archive or retrieve a snapshot store.
protected long	m_cMillisTotal The total time in millis taken to archive or retrieve snapshot stores.

Constructor Summary

Constructors

Constructor and Description
AbstractSnapshotArchiver(String sClusterName, String sServiceName) Create a new AbstractSnapshotArchiver which is used to archive and retrieve snapshot parts to/from a common archive location.

Method Summary

Modifier and Type	Method and Description
void	archive(Snapshot snapshot, com.oracle.datagrid.persistence.PersistenceEnvironment<ReadBuffer> env) Archive the specified snapshot.
protected abstract void	archiveInternal(Snapshot snapshot, com.oracle.datagrid.persistence.PersistenceManager<ReadBuffer> mgr) Internal implementation to Archive the specified snapshot.
protected com.oracle.datagrid.persistence.PersistenceEnvironment<ReadBuffer>	createTempEnvironment(File fileBaseDir, String sStorageFormat) Create a temporary PersistenceEnvironment to write archived snapshots to in the given format.
protected void	displayStatistics(Snapshot snapshot, String sType) Display the collected statistics for the given snapshot and type of operation.
Snapshot	get(String sSnapshot) Return a Snapshot which represents the archived snapshot with the given identifier.
protected abstract Properties	getMetadata(String sSnapshot) Internal implementation to retrieve the metadata stored for the archived snapshot.
com.oracle.datagrid.persistence.PersistenceTools	getPersistenceTools(String sSnapshot) Return an instance of PersistenceTools allowing offline operations to be performed against the associated PersistenceManager and appropriate PersistentStore.
protected boolean	hasArchivedSnapshot(String sSnapshot) Return true if the specified snapshot exists for this archiver.
protected boolean	hasLocalSnapshot(com.oracle.datagrid.persistence.PersistenceEnvironment<ReadBuffer> env, String sSnapshot) Return true if the specified snapshot exists for the PersistenceEnvironment.
protected com.oracle.datagrid.persistence.PersistenceTools	instantiatePersistenceTools(com.oracle.datagrid.persistence.OfflinePersistenceInfo info, String sSnapshot) Instantiate an instance of PersistenceTools relevant to this archiver and the provided snapshot.
String[]	list() Return the identifiers of the archived snapshots known to this archiver.
protected abstract String[]	listInternal() Internal implementation to return the identifiers of the archived snapshots known to this archiver.
protected abstract String[]	listStoresInternal(String sSnapshot) List the stores for a given snapshot.
protected void	recordEndTime() Record the end time of the operation and update min and max values.
protected void	recordStartTime() Record the start time of the operation.
boolean	remove(String sSnapshot) Remove the archived snapshot with the specified identifier.
protected abstract boolean	removeInternal(String sSnapshot) Internal implementation to remove the specified archived snapshot.
protected void	resetStatistics() Reset the statistics recording the archive and retrieve times.
void	retrieve(Snapshot snapshot, com.oracle.datagrid.persistence.PersistenceEnvironment<ReadBuffer> env) Retrieve the specified archived snapshot.
protected abstract void	retrieveInternal(Snapshot snapshot, com.oracle.datagrid.persistence.PersistenceManager<ReadBuffer> mgr) Internal implementation to retrieve the specified snapshot.
String	toString()
protected void	writeMetadata(File fileDir, com.oracle.datagrid.persistence.PersistenceManager<ReadBuffer> mgr, String sStore) Write the metadata using given manager for a particular store to a destination directory.

Methods inherited from class java.lang.Object

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

Field Detail

f_sClusterName

protected final String f_sClusterName

The cluster name.

f_sServiceName

protected final String f_sServiceName

The service name.

m_cMillisTotal

protected long m_cMillisTotal

The total time in millis taken to archive or retrieve snapshot stores.

m_cMillisMax

protected long m_cMillisMax

The maxiumum time in millis to archive or retrieve a snapshot store.

m_cMillisMin

protected long m_cMillisMin

The minimum time in millis to archive or retrieve a snapshot store.

m_cMillisLastStart

protected long m_cMillisLastStart

The start time of the last operation.

Constructor Detail

AbstractSnapshotArchiver

public AbstractSnapshotArchiver(String sClusterName,
                                String sServiceName)

Create a new AbstractSnapshotArchiver which is used to archive and retrieve snapshot parts to/from a common archive location.
There will be one instance of a AbstractSnapshotArchiver implementation per storage node / per configured Persistence service.

Parameters:

sClusterName - the name of the cluster

sServiceName - the service name

Method Detail

list

public String[] list()

Description copied from interface: SnapshotArchiver

Return the identifiers of the archived snapshots known to this archiver.

Specified by:

list in interface SnapshotArchiver

Returns:

a list of the known archived snapshot identifiers

get

public Snapshot get(String sSnapshot)

Description copied from interface: SnapshotArchiver

Return a Snapshot which represents the archived snapshot with the given identifier.

Specified by:

get in interface SnapshotArchiver

Parameters:

sSnapshot - the identifier of the archived snapshot

Returns:

the Snapshot

remove

public boolean remove(String sSnapshot)

Description copied from interface: SnapshotArchiver

Remove the archived snapshot with the specified identifier.

Specified by:

remove in interface SnapshotArchiver

Parameters:

sSnapshot - the identifier of the archived snapshot

Returns:

true if the snapshot was successfully deleted, false otherwise

archive

public void archive(Snapshot snapshot,
                    com.oracle.datagrid.persistence.PersistenceEnvironment<ReadBuffer> env)

Description copied from interface: SnapshotArchiver

Archive the specified snapshot.

Specified by:

archive in interface SnapshotArchiver

Parameters:

snapshot - the snapshot to archive

env - the PersistenceEnvironment used to read the snapshot

retrieve

public void retrieve(Snapshot snapshot,
                     com.oracle.datagrid.persistence.PersistenceEnvironment<ReadBuffer> env)

Description copied from interface: SnapshotArchiver

Retrieve the specified archived snapshot.

Specified by:

retrieve in interface SnapshotArchiver

Parameters:

snapshot - the snapshot to retrieve

env - the PersistenceEnvironment used to write the snapshot

getPersistenceTools

public com.oracle.datagrid.persistence.PersistenceTools getPersistenceTools(String sSnapshot)

Description copied from interface: SnapshotArchiver

Return an instance of PersistenceTools allowing offline operations to be performed against the associated PersistenceManager and appropriate PersistentStore.

Specified by:

getPersistenceTools in interface SnapshotArchiver

Parameters:

sSnapshot - the snapshot to return tools for

Returns:

a PersistenceTools implementation

listInternal

protected abstract String[] listInternal()

Internal implementation to return the identifiers of the archived snapshots known to this archiver.

Returns:

a list of the known archived snapshot identifiers

archiveInternal

protected abstract void archiveInternal(Snapshot snapshot,
                                        com.oracle.datagrid.persistence.PersistenceManager<ReadBuffer> mgr)

Internal implementation to Archive the specified snapshot.

Parameters:

snapshot - the snapshot to archive

mgr - the PersistenceManager used to read the stores from

retrieveInternal

protected abstract void retrieveInternal(Snapshot snapshot,
                                         com.oracle.datagrid.persistence.PersistenceManager<ReadBuffer> mgr)

Internal implementation to retrieve the specified snapshot.

Parameters:

snapshot - the snapshot to retrieve

mgr - the PersistenceManager used to write the stores to

removeInternal

protected abstract boolean removeInternal(String sSnapshot)

Internal implementation to remove the specified archived snapshot. (Called by JMX operation removeArchivedSnapshot)

Parameters:

sSnapshot - the snapshot name to remove

Returns:

true if the snapshot was removed

listStoresInternal

protected abstract String[] listStoresInternal(String sSnapshot)

List the stores for a given snapshot.

Parameters:

sSnapshot - the snapshot name to list stores for

Returns:

a String[] of store names

getMetadata

protected abstract Properties getMetadata(String sSnapshot)
                                   throws IOException

Internal implementation to retrieve the metadata stored for the archived snapshot.

Parameters:

sSnapshot - the snapshot name to retrieve metadata

Returns:

the metadata for the archived snapshot

Throws:

IOException - if any I/O related problems

instantiatePersistenceTools

protected com.oracle.datagrid.persistence.PersistenceTools instantiatePersistenceTools(com.oracle.datagrid.persistence.OfflinePersistenceInfo info,
                                                                                       String sSnapshot)

Instantiate an instance of PersistenceTools relevant to this archiver and the provided snapshot.

Parameters:

info - the information about this archived snapshot

sSnapshot - the snapshot name to use

Returns:

an instance of PersistenceTools

resetStatistics

protected void resetStatistics()

Reset the statistics recording the archive and retrieve times.

recordStartTime

protected void recordStartTime()

Record the start time of the operation.

recordEndTime

protected void recordEndTime()

Record the end time of the operation and update min and max values.

displayStatistics

protected void displayStatistics(Snapshot snapshot,
                                 String sType)

Display the collected statistics for the given snapshot and type of operation.

Parameters:

snapshot - the snapshot that was archived or retrieved

sType - the type of operation, either "archive" or "retrieve"

toString

public String toString()

Overrides:

toString in class Object

hasLocalSnapshot

protected boolean hasLocalSnapshot(com.oracle.datagrid.persistence.PersistenceEnvironment<ReadBuffer> env,
                                   String sSnapshot)

Return true if the specified snapshot exists for the PersistenceEnvironment.

Parameters:

env - the PersistenceEnvironment to query

sSnapshot - the snapshot name to check for

Returns:

true if the specified snapshot exists

hasArchivedSnapshot

protected boolean hasArchivedSnapshot(String sSnapshot)

Return true if the specified snapshot exists for this archiver.

Parameters:

sSnapshot - the snapshot name to check for

Returns:

true if the specified snapshot exists

createTempEnvironment

protected com.oracle.datagrid.persistence.PersistenceEnvironment<ReadBuffer> createTempEnvironment(File fileBaseDir,
                                                                                                   String sStorageFormat)
                                                                                            throws IOException

Create a temporary PersistenceEnvironment to write archived snapshots to in the given format.

Parameters:

fileBaseDir - the directory off which to create the environment

sStorageFormat - the storage format to use

Returns:

a PersistenceEnvironment which can be used to write archived snapshots to

Throws:

IOException - if any I/O related errors.

writeMetadata

protected void writeMetadata(File fileDir,
                             com.oracle.datagrid.persistence.PersistenceManager<ReadBuffer> mgr,
                             String sStore)
                      throws IOException

Write the metadata using given manager for a particular store to a destination directory.

Parameters:

fileDir - the directory to write metadata to

mgr - the PersistenceManager used to write the metadata

sStore - a store to use to read the partition count from

Throws:

IOException - if any errors writing metadata