org.imixs.archive.service.cassandra

Class DataService

java.lang.Object

org.imixs.archive.service.cassandra.DataService

public class DataService
extends Object

The SnapshotService is used to store a imixs snapshot into the cluster keyspace.

Author:

rsoika

Field Summary

Fields

Modifier and Type	Field and Description
static String	COLUMN_DATA
static String	COLUMN_MD5
static String	COLUMN_MODIFIED
static String	COLUMN_SNAPSHOT
static String	COLUMN_UNIQUEID
protected javax.enterprise.event.Event<ArchiveEvent>	events
static String	ITEM_MD5_CHECKSUM
static String	STATEMENT_SELECT_DOCUMENT
static String	STATEMENT_SELECT_MD5
static String	STATEMENT_SELECT_METADATA
static String	STATEMENT_SELECT_SNAPSHOT
static String	STATEMENT_SELECT_SNAPSHOT_ID
static String	STATEMENT_SELECT_SNAPSHOTS_BY_MODIFIED
static String	STATEMENT_SELECT_SNAPSHOTS_BY_UNIQUEID
static String	STATEMENT_UPSET_DOCUMENTS
static String	STATEMENT_UPSET_SNAPSHOTS
static String	STATEMENT_UPSET_SNAPSHOTS_BY_DOCUMENT
static String	STATEMENT_UPSET_SNAPSHOTS_BY_MODIFIED
static String	STATEMENT_UPSET_SNAPSHOTS_BY_UNIQUEID

Constructor Summary

Constructors

Constructor and Description
DataService()

Method Summary

Modifier and Type	Method and Description
static long	calculateSize(org.imixs.workflow.xml.XMLDocument xmldoc) count total value size...
void	deleteSnapshot(org.imixs.workflow.ItemCollection itemCol, com.datastax.driver.core.Session session) This method deletes a snapshot.
boolean	existSnapshot(String snapshotID, com.datastax.driver.core.Session session) This method test if a snapshot recored with a given ID already exists.
static org.imixs.workflow.ItemCollection	getItemCollection(byte[] source) Converts a byte array into a XMLDocument and returns the ItemCollection object.
static byte[]	getRawData(org.imixs.workflow.ItemCollection itemCol) Converts a ItemCollection into a XMLDocument and returns the byte data.
static long	getSnapshotTime(String snapshotID) Returns the snapshot time n milis of a $SnapshotID
static String	getUniqueID(String snapshotID) Returns the $uniqueID from a $SnapshotID
static boolean	isSnapshotID(String uid) This method returns true if the given id is a valid Snapshot id (UUI + timestamp We also need to support the old snapshto format 4832b09a1a-20c38abd-1519421083952
org.imixs.workflow.ItemCollection	loadMetadata(com.datastax.driver.core.Session session) This method loads the metadata object represended by an ItemCollection.
org.imixs.workflow.ItemCollection	loadSnapshot(String snapshotID, boolean mergeDocuments, com.datastax.driver.core.Session session) Thist method loads a snapshot form the cassandra cluster.
org.imixs.workflow.ItemCollection	loadSnapshot(String snapshotID, com.datastax.driver.core.Session session) This method loads a snapshot form the cassandra cluster.
List<String>	loadSnapshotsByDate(Date date, com.datastax.driver.core.Session session) This method loads all exsting snapshotIDs for a given date.
List<String>	loadSnapshotsByUnqiueID(String uniqueID, com.datastax.driver.core.Session session) This method loads all exsting snapshotIDs for a given unqiueID.
void	saveMetadata(org.imixs.workflow.ItemCollection metadata, com.datastax.driver.core.Session session) This method saves the metadata represented by an ItemCollection.
void	saveSnapshot(org.imixs.workflow.ItemCollection snapshot, com.datastax.driver.core.Session session) This method saves a ItemCollection into a specific KeySpace.

Methods inherited from class java.lang.Object

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

Field Detail

ITEM_MD5_CHECKSUM

public static final String ITEM_MD5_CHECKSUM

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Constant Field Values

COLUMN_SNAPSHOT

public static final String COLUMN_SNAPSHOT

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Constant Field Values

COLUMN_MODIFIED

public static final String COLUMN_MODIFIED

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Constant Field Values

COLUMN_UNIQUEID

public static final String COLUMN_UNIQUEID

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Constant Field Values

COLUMN_DATA

public static final String COLUMN_DATA

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Constant Field Values

COLUMN_MD5

public static final String COLUMN_MD5

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Constant Field Values

STATEMENT_UPSET_SNAPSHOTS

public static final String STATEMENT_UPSET_SNAPSHOTS

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Constant Field Values

STATEMENT_UPSET_SNAPSHOTS_BY_UNIQUEID

public static final String STATEMENT_UPSET_SNAPSHOTS_BY_UNIQUEID

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Constant Field Values

STATEMENT_UPSET_SNAPSHOTS_BY_MODIFIED

public static final String STATEMENT_UPSET_SNAPSHOTS_BY_MODIFIED

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Constant Field Values

STATEMENT_UPSET_DOCUMENTS

public static final String STATEMENT_UPSET_DOCUMENTS

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Constant Field Values

STATEMENT_UPSET_SNAPSHOTS_BY_DOCUMENT

public static final String STATEMENT_UPSET_SNAPSHOTS_BY_DOCUMENT

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Constant Field Values

STATEMENT_SELECT_SNAPSHOT

public static final String STATEMENT_SELECT_SNAPSHOT

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Constant Field Values

STATEMENT_SELECT_METADATA

public static final String STATEMENT_SELECT_METADATA

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Constant Field Values

STATEMENT_SELECT_SNAPSHOT_ID

public static final String STATEMENT_SELECT_SNAPSHOT_ID

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Constant Field Values

STATEMENT_SELECT_MD5

public static final String STATEMENT_SELECT_MD5

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Constant Field Values

STATEMENT_SELECT_DOCUMENT

public static final String STATEMENT_SELECT_DOCUMENT

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Constant Field Values

STATEMENT_SELECT_SNAPSHOTS_BY_UNIQUEID

public static final String STATEMENT_SELECT_SNAPSHOTS_BY_UNIQUEID

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Constant Field Values

STATEMENT_SELECT_SNAPSHOTS_BY_MODIFIED

public static final String STATEMENT_SELECT_SNAPSHOTS_BY_MODIFIED

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Constant Field Values

events

@Inject
protected javax.enterprise.event.Event<ArchiveEvent> events

Constructor Detail

DataService

public DataService()

Method Detail

saveSnapshot

public void saveSnapshot(org.imixs.workflow.ItemCollection snapshot,
                         com.datastax.driver.core.Session session)
                  throws ArchiveException

This method saves a ItemCollection into a specific KeySpace.

The method expects a valid session instance which must be closed by the client.

Parameters:

snapshot - - ItemCollection object

session - - cassandra session

Throws:

ArchiveException

existSnapshot

public boolean existSnapshot(String snapshotID,
                             com.datastax.driver.core.Session session)

This method test if a snapshot recored with a given ID already exists.

Parameters:

snapshotID -

Returns:

true if the snapshot exists.

loadSnapshot

public org.imixs.workflow.ItemCollection loadSnapshot(String snapshotID,
                                                      com.datastax.driver.core.Session session)
                                               throws ArchiveException

This method loads a snapshot form the cassandra cluster. The snapshot data includes also the accociated document data. In case you need only the snapshotdata without documents use loadSnapshot(id,false,session).

Parameters:

snapshotID - - snapshot id

session - - cassandra session

Returns:

snapshot data including documents

Throws:

ArchiveException

loadSnapshot

public org.imixs.workflow.ItemCollection loadSnapshot(String snapshotID,
                                                      boolean mergeDocuments,
                                                      com.datastax.driver.core.Session session)
                                               throws ArchiveException

Thist method loads a snapshot form the cassandra cluster.

Parameters:

snapshotID - - snapshot id

mergeDocuments - - boolean, if true the accociated document data will be loaded and merged into the snapshot data object.

session - - cassandra session

Returns:

snapshot data

Throws:

ArchiveException

loadMetadata

public org.imixs.workflow.ItemCollection loadMetadata(com.datastax.driver.core.Session session)
                                               throws ArchiveException

This method loads the metadata object represended by an ItemCollection. The snapshot id for the metadata object is always "0". This id is reserverd for metadata only.

If no metadata object yet exists, the method returns an empty ItemCollection.

The method expects a valid session instance which must be closed by the client.

Returns:

metadata object

Throws:

ArchiveException

loadSnapshotsByUnqiueID

public List<String> loadSnapshotsByUnqiueID(String uniqueID,
                                            com.datastax.driver.core.Session session)

This method loads all exsting snapshotIDs for a given unqiueID.

Parameters:

uniqueID -

Returns:

list of snapshots

loadSnapshotsByDate

public List<String> loadSnapshotsByDate(Date date,
                                        com.datastax.driver.core.Session session)

This method loads all exsting snapshotIDs for a given date.

Parameters:

date -

Returns:

list of snapshots

saveMetadata

public void saveMetadata(org.imixs.workflow.ItemCollection metadata,
                         com.datastax.driver.core.Session session)
                  throws ArchiveException

This method saves the metadata represented by an ItemCollection. The snapshot id for the metadata object is always "0". This id is reserverd for metadata only.

The method expects a valid session instance which must be closed by the client.

Parameters:

itemCol - - metadata

Throws:

ArchiveException

deleteSnapshot

public void deleteSnapshot(org.imixs.workflow.ItemCollection itemCol,
                           com.datastax.driver.core.Session session)
                    throws ArchiveException

This method deletes a snapshot.

The method also deletes the documents and all relations

Parameters:

itemCol -

session - - cassandra session

Throws:

ArchiveException

getRawData

public static byte[] getRawData(org.imixs.workflow.ItemCollection itemCol)
                         throws ArchiveException

Converts a ItemCollection into a XMLDocument and returns the byte data.

Parameters:

itemCol -

Returns:

Throws:

ArchiveException

getItemCollection

public static org.imixs.workflow.ItemCollection getItemCollection(byte[] source)
                                                           throws ArchiveException

Converts a byte array into a XMLDocument and returns the ItemCollection object.

Throws:

ArchiveException

isSnapshotID

public static boolean isSnapshotID(String uid)

This method returns true if the given id is a valid Snapshot id (UUI + timestamp

We also need to support the old snapshto format 4832b09a1a-20c38abd-1519421083952

Parameters:

uid -

Returns:

getUniqueID

public static String getUniqueID(String snapshotID)

Returns the $uniqueID from a $SnapshotID

Parameters:

snapshotID -

Returns:

$uniqueid

getSnapshotTime

public static long getSnapshotTime(String snapshotID)

Returns the snapshot time n milis of a $SnapshotID

Parameters:

snapshotID -

Returns:

long - snapshot time

calculateSize

public static long calculateSize(org.imixs.workflow.xml.XMLDocument xmldoc)

count total value size...

Parameters:

xmldoc -

Returns: