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 java.util.Set<java.lang.String>	REPLICATED_SYSTEM_KEYSPACE_NAMES
static java.util.Set<java.lang.String>	SYSTEM_KEYSPACE_NAMES

Constructor Summary

Constructors

Constructor and Description
Schema() Initialize empty schema object and load the hardcoded system tables

Method Summary

Modifier and Type	Method and Description
void	addAggregate(UDAggregate uda)
void	addFunction(UDFunction udf)
void	addKeyspace(KeyspaceMetadata ksm)
void	addTable(CFMetaData cfm)
void	addType(UserType ut)
void	addView(ViewDefinition view)
void	clear() Clear all KS/CF metadata and reset version.
void	clearKeyspaceMetadata(KeyspaceMetadata ksm) Remove keyspace definition from system
void	dropAggregate(UDAggregate uda)
void	dropFunction(UDFunction udf)
void	dropKeyspace(java.lang.String ksName)
void	dropTable(java.lang.String ksName, java.lang.String tableName)
void	dropType(UserType ut)
void	dropView(java.lang.String ksName, java.lang.String viewName)
java.util.Optional<Function>	findFunction(FunctionName name, java.util.List<AbstractType<?>> argTypes) Find the function with the specified name
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 and column family name, get the column family meta data.
CFMetaData	getCFMetaData(java.util.UUID cfId) Get ColumnFamily metadata by its identifier
ColumnFamilyStore	getColumnFamilyStoreIncludingIndexes(Pair<java.lang.String,java.lang.String> ksNameAndCFName) Retrieve a CFS by name even if that CFS is an index An index is identified by looking for '.' in the CF name and separating to find the base table containing the index
ColumnFamilyStore	getColumnFamilyStoreInstance(java.util.UUID cfId)
java.util.Collection<Function>	getFunctions(FunctionName name) Get all function overloads with the specified name
java.util.UUID	getId(java.lang.String ksName, java.lang.String cfName) Lookup keyspace/ColumnFamily identifier
Keyspace	getKeyspaceInstance(java.lang.String keyspaceName) Get keyspace instance by name
java.util.Set<java.lang.String>	getKeyspaces()
Keyspaces	getKeyspaces(java.util.Set<java.lang.String> includedKeyspaceNames)
KeyspaceMetadata	getKSMetaData(java.lang.String keyspaceName) Get metadata about keyspace by its name
java.util.List<java.lang.String>	getNonLocalStrategyKeyspaces()
java.util.List<java.lang.String>	getNonSystemKeyspaces()
java.lang.Iterable<CFMetaData>	getTablesAndViews(java.lang.String keyspaceName) Get metadata about keyspace inner ColumnFamilies
java.util.List<java.lang.String>	getUserKeyspaces()
java.util.UUID	getVersion()
ViewDefinition	getView(java.lang.String keyspaceName, java.lang.String viewName)
boolean	hasCF(Pair<java.lang.String,java.lang.String> ksAndCFName)
static boolean	isSystemKeyspace(java.lang.String keyspaceName)
void	load(CFMetaData cfm) Load individual ColumnFamily Definition to the schema (to make ColumnFamily lookup faster)
Schema	load(java.lang.Iterable<KeyspaceMetadata> keyspaceDefs) Load up non-system keyspaces
Schema	load(KeyspaceMetadata keyspaceDef) Load specific keyspace into Schema
void	load(ViewDefinition view) Load individual View Definition to the schema (to make View lookup faster)
Schema	loadFromDisk() load keyspace (keyspace) definitions, but do not initialize the keyspace instances.
Schema	loadFromDisk(boolean updateVersion) Load schema definitions from disk.
Keyspace	removeKeyspaceInstance(java.lang.String keyspaceName) Remove keyspace from schema
void	setKeyspaceMetadata(KeyspaceMetadata ksm) Update (or insert) new keyspace definition
void	storeKeyspaceInstance(Keyspace keyspace) Store given Keyspace instance to the schema
void	unload(CFMetaData cfm) Used for ColumnFamily data eviction out from the schema
void	updateAggregate(UDAggregate uda)
void	updateFunction(UDFunction udf)
void	updateKeyspace(java.lang.String ksName, KeyspaceParams newParams)
void	updateTable(CFMetaData table)
void	updateType(UserType ut)
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()
void	updateView(ViewDefinition view)

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

SYSTEM_KEYSPACE_NAMES

public static final java.util.Set<java.lang.String> SYSTEM_KEYSPACE_NAMES

REPLICATED_SYSTEM_KEYSPACE_NAMES

public static final java.util.Set<java.lang.String> REPLICATED_SYSTEM_KEYSPACE_NAMES

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

Constructor Detail

Schema

public Schema()

Initialize empty schema object and load the hardcoded system tables

Method Detail

isSystemKeyspace

public static boolean isSystemKeyspace(java.lang.String keyspaceName)

Returns:

whether or not the keyspace is a really system one (w/ LocalStrategy, unmodifiable, hardcoded)

loadFromDisk

public Schema loadFromDisk()

load keyspace (keyspace) definitions, but do not initialize the keyspace instances. Schema version may be updated as the result.

loadFromDisk

public Schema loadFromDisk(boolean updateVersion)

Load schema definitions from disk.

Parameters:

updateVersion - true if schema version needs to be updated

load

public Schema load(java.lang.Iterable<KeyspaceMetadata> keyspaceDefs)

Load up non-system keyspaces

Parameters:

keyspaceDefs - The non-system keyspace definitions

Returns:

self to support chaining calls

load

public Schema load(KeyspaceMetadata 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

getColumnFamilyStoreIncludingIndexes

public ColumnFamilyStore getColumnFamilyStoreIncludingIndexes(Pair<java.lang.String,java.lang.String> ksNameAndCFName)

Retrieve a CFS by name even if that CFS is an index An index is identified by looking for '.' in the CF name and separating to find the base table containing the index

Parameters:

ksNameAndCFName -

Returns:

The named CFS or null if the keyspace, base table, or index don't exist

getColumnFamilyStoreInstance

public ColumnFamilyStore getColumnFamilyStoreInstance(java.util.UUID cfId)

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

clearKeyspaceMetadata

public void clearKeyspaceMetadata(KeyspaceMetadata 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 and 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)

getView

public ViewDefinition getView(java.lang.String keyspaceName,
                              java.lang.String viewName)

getKSMetaData

public KeyspaceMetadata 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 (note that this count as system only the non replicated keyspaces, so keyspace like system_traces which are replicated are actually returned. See getUserKeyspace() below if you don't want those)

getNonLocalStrategyKeyspaces

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

Returns:

a collection of keyspaces that do not use LocalStrategy for replication

getUserKeyspaces

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

Returns:

collection of the user defined keyspaces

getTablesAndViews

public java.lang.Iterable<CFMetaData> getTablesAndViews(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)

getKeyspaces

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

setKeyspaceMetadata

public void setKeyspaceMetadata(KeyspaceMetadata 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.

hasCF

public boolean hasCF(Pair<java.lang.String,java.lang.String> ksAndCFName)

Parameters:

ksAndCFName - The identifier of the ColumnFamily to lookup

Returns:

true if the KS and CF pair is a known one, false otherwise.

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

load

public void load(ViewDefinition view)

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

Parameters:

view - The View definition to load

unload

public void unload(CFMetaData cfm)

Used for ColumnFamily data eviction out from the schema

Parameters:

cfm - The ColumnFamily Definition to evict

getFunctions

public java.util.Collection<Function> getFunctions(FunctionName name)

Get all function overloads with the specified name

Parameters:

name - fully qualified function name

Returns:

an empty list if the keyspace or the function name are not found; a non-empty collection of Function otherwise

findFunction

public java.util.Optional<Function> findFunction(FunctionName name,
                                                 java.util.List<AbstractType<?>> argTypes)

Find the function with the specified name

Parameters:

name - fully qualified function name

argTypes - function argument types

Returns:

an empty Optional if the keyspace or the function name are not found; a non-empty optional of Function otherwise

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.

addKeyspace

public void addKeyspace(KeyspaceMetadata ksm)

updateKeyspace

public void updateKeyspace(java.lang.String ksName,
                           KeyspaceParams newParams)

dropKeyspace

public void dropKeyspace(java.lang.String ksName)

addTable

public void addTable(CFMetaData cfm)

updateTable

public void updateTable(CFMetaData table)

dropTable

public void dropTable(java.lang.String ksName,
                      java.lang.String tableName)

addView

public void addView(ViewDefinition view)

updateView

public void updateView(ViewDefinition view)

dropView

public void dropView(java.lang.String ksName,
                     java.lang.String viewName)

addType

public void addType(UserType ut)

updateType

public void updateType(UserType ut)

dropType

public void dropType(UserType ut)

addFunction

public void addFunction(UDFunction udf)

updateFunction

public void updateFunction(UDFunction udf)

dropFunction

public void dropFunction(UDFunction udf)

addAggregate

public void addAggregate(UDAggregate uda)

updateAggregate

public void updateAggregate(UDAggregate uda)

dropAggregate

public void dropAggregate(UDAggregate uda)