org.apache.cassandra.config

Class Schema

java.lang.Object

org.apache.cassandra.config.Schema

public class Schema
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
static java.util.UUID	emptyVersion
static Schema	instance
static int	NAME_LENGTH longest permissible KS or CF name.
static com.google.common.collect.ImmutableSet<java.lang.String>	systemKeyspaceNames

Constructor Summary

Constructors

Constructor and Description
Schema() Initialize empty schema object

Method Summary

Methods

Modifier and Type	Method and Description
void	clear() Clear all KS/CF metadata and reset version.
void	clearKeyspaceDefinition(KSMetaData ksm) Remove keyspace definition from system
Pair<java.lang.String,java.lang.String>	getCF(java.util.UUID cfId)
CFMetaData	getCFMetaData(Descriptor descriptor)
CFMetaData	getCFMetaData(java.lang.String keyspaceName, java.lang.String cfName) Given a keyspace name & column family name, get the column family meta data.
CFMetaData	getCFMetaData(java.util.UUID cfId) Get ColumnFamily metadata by its identifier
ColumnFamilyType	getColumnFamilyType(java.lang.String ksName, java.lang.String cfName) Get type of the ColumnFamily but it's keyspace/name
AbstractType<?>	getComparator(java.lang.String ksName, java.lang.String cfName) Get column comparator for ColumnFamily but it's keyspace/name
java.util.UUID	getId(java.lang.String ksName, java.lang.String cfName) Lookup keyspace/ColumnFamily identifier
java.util.Collection<KSMetaData>	getKeyspaceDefinitions()
Keyspace	getKeyspaceInstance(java.lang.String keyspaceName) Get keyspace instance by name
java.util.Map<java.lang.String,CFMetaData>	getKeyspaceMetaData(java.lang.String keyspaceName) Get metadata about keyspace inner ColumnFamilies
java.util.Set<java.lang.String>	getKeyspaces()
KSMetaData	getKSMetaData(java.lang.String keyspaceName) Get metadata about keyspace by its name
java.util.List<java.lang.String>	getNonSystemKeyspaces()
java.util.UUID	getVersion()
static boolean	ignoredSchemaRow(Row row)
static boolean	invalidSchemaRow(Row row)
void	load(CFMetaData cfm) Load individual ColumnFamily Definition to the schema (to make ColumnFamily lookup faster)
Schema	load(java.util.Collection<KSMetaData> keyspaceDefs) Load up non-system keyspaces
Schema	load(KSMetaData keyspaceDef) Load specific keyspace into Schema
void	purge(CFMetaData cfm) Used for ColumnFamily data eviction out from the schema
Keyspace	removeKeyspaceInstance(java.lang.String keyspaceName) Remove keyspace from schema
void	setKeyspaceDefinition(KSMetaData ksm) Update (or insert) new keyspace definition
void	storeKeyspaceInstance(Keyspace keyspace) Store given Keyspace instance to the schema
void	updateVersion() Read schema from system keyspace and calculate MD5 digest of every row, resulting digest will be converted into UUID which would act as content-based version of the schema.
void	updateVersionAndAnnounce()

Methods inherited from class java.lang.Object

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

Field Detail

instance

public static final Schema instance

NAME_LENGTH

public static final int NAME_LENGTH

longest permissible KS or CF name. Our main concern is that filename not be more than 255 characters; the filename will contain both the KS and CF names. Since non-schema-name components only take up ~64 characters, we could allow longer names than this, but on Windows, the entire path should be not greater than 255 characters, so a lower limit here helps avoid problems. See CASSANDRA-4110.

See Also:

Constant Field Values

emptyVersion

public static final java.util.UUID emptyVersion

systemKeyspaceNames

public static final com.google.common.collect.ImmutableSet<java.lang.String> systemKeyspaceNames

Constructor Detail

Schema

public Schema()

Initialize empty schema object

Method Detail

load

public Schema load(java.util.Collection<KSMetaData> keyspaceDefs)

Load up non-system keyspaces

Parameters:

keyspaceDefs - The non-system keyspace definitions

Returns:

self to support chaining calls

load

public Schema load(KSMetaData keyspaceDef)

Load specific keyspace into Schema

Parameters:

keyspaceDef - The keyspace to load up

Returns:

self to support chaining calls

getKeyspaceInstance

public Keyspace getKeyspaceInstance(java.lang.String keyspaceName)

Get keyspace instance by name

Parameters:

keyspaceName - The name of the keyspace

Returns:

Keyspace object or null if keyspace was not found

storeKeyspaceInstance

public void storeKeyspaceInstance(Keyspace keyspace)

Store given Keyspace instance to the schema

Parameters:

keyspace - The Keyspace instance to store

Throws:

java.lang.IllegalArgumentException - if Keyspace is already stored

removeKeyspaceInstance

public Keyspace removeKeyspaceInstance(java.lang.String keyspaceName)

Remove keyspace from schema

Parameters:

keyspaceName - The name of the keyspace to remove

Returns:

removed keyspace instance or null if it wasn't found

clearKeyspaceDefinition

public void clearKeyspaceDefinition(KSMetaData ksm)

Remove keyspace definition from system

Parameters:

ksm - The keyspace definition to remove

getCFMetaData

public CFMetaData getCFMetaData(java.lang.String keyspaceName,
                       java.lang.String cfName)

Given a keyspace name & column family name, get the column family meta data. If the keyspace name or column family name is not valid this function returns null.

Parameters:

keyspaceName - The keyspace name

cfName - The ColumnFamily name

Returns:

ColumnFamily Metadata object or null if it wasn't found

getCFMetaData

public CFMetaData getCFMetaData(java.util.UUID cfId)

Get ColumnFamily metadata by its identifier

Parameters:

cfId - The ColumnFamily identifier

Returns:

metadata about ColumnFamily

getCFMetaData

public CFMetaData getCFMetaData(Descriptor descriptor)

getColumnFamilyType

public ColumnFamilyType getColumnFamilyType(java.lang.String ksName,
                                   java.lang.String cfName)

Get type of the ColumnFamily but it's keyspace/name

Parameters:

ksName - The keyspace name

cfName - The ColumnFamily name

Returns:

The type of the ColumnFamily

getComparator

public AbstractType<?> getComparator(java.lang.String ksName,
                            java.lang.String cfName)

Get column comparator for ColumnFamily but it's keyspace/name

Parameters:

ksName - The keyspace name

cfName - The ColumnFamily name

Returns:

The comparator of the ColumnFamily

getKSMetaData

public KSMetaData getKSMetaData(java.lang.String keyspaceName)

Get metadata about keyspace by its name

Parameters:

keyspaceName - The name of the keyspace

Returns:

The keyspace metadata or null if it wasn't found

getNonSystemKeyspaces

public java.util.List<java.lang.String> getNonSystemKeyspaces()

Returns:

collection of the non-system keyspaces

getKeyspaceMetaData

public java.util.Map<java.lang.String,CFMetaData> getKeyspaceMetaData(java.lang.String keyspaceName)

Get metadata about keyspace inner ColumnFamilies

Parameters:

keyspaceName - The name of the keyspace

Returns:

metadata about ColumnFamilies the belong to the given keyspace

getKeyspaces

public java.util.Set<java.lang.String> getKeyspaces()

Returns:

collection of the all keyspace names registered in the system (system and non-system)

getKeyspaceDefinitions

public java.util.Collection<KSMetaData> getKeyspaceDefinitions()

Returns:

collection of the metadata about all keyspaces registered in the system (system and non-system)

setKeyspaceDefinition

public void setKeyspaceDefinition(KSMetaData ksm)

Update (or insert) new keyspace definition

Parameters:

ksm - The metadata about keyspace

getCF

public Pair<java.lang.String,java.lang.String> getCF(java.util.UUID cfId)

Parameters:

cfId - The identifier of the ColumnFamily to lookup

Returns:

The (ksname,cfname) pair for the given id, or null if it has been dropped.

getId

public java.util.UUID getId(java.lang.String ksName,
                   java.lang.String cfName)

Lookup keyspace/ColumnFamily identifier

Parameters:

ksName - The keyspace name

cfName - The ColumnFamily name

Returns:

The id for the given (ksname,cfname) pair, or null if it has been dropped.

load

public void load(CFMetaData cfm)

Load individual ColumnFamily Definition to the schema (to make ColumnFamily lookup faster)

Parameters:

cfm - The ColumnFamily definition to load

purge

public void purge(CFMetaData cfm)

Used for ColumnFamily data eviction out from the schema

Parameters:

cfm - The ColumnFamily Definition to evict

getVersion

public java.util.UUID getVersion()

Returns:

current schema version

updateVersion

public void updateVersion()

Read schema from system keyspace and calculate MD5 digest of every row, resulting digest will be converted into UUID which would act as content-based version of the schema.

updateVersionAndAnnounce

public void updateVersionAndAnnounce()

clear

public void clear()

Clear all KS/CF metadata and reset version.

invalidSchemaRow

public static boolean invalidSchemaRow(Row row)

ignoredSchemaRow

public static boolean ignoredSchemaRow(Row row)