org.apache.cassandra.schema

Class Schema

java.lang.Object

org.apache.cassandra.schema.Schema

All Implemented Interfaces:

SchemaProvider

public final class Schema
extends java.lang.Object
implements SchemaProvider

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Schema.TransformationResult

Field Summary

Fields

Modifier and Type	Field and Description
static Schema	instance

Method Summary

Modifier and Type	Method and Description
void	clear() Clear all KS/CF metadata and reset version.
java.util.Optional<Function>	findFunction(FunctionName name, java.util.List<AbstractType<?>> argTypes) Find the function with the specified name
ColumnFamilyStore	getColumnFamilyStoreInstance(TableId id)
java.util.Collection<Function>	getFunctions(FunctionName name) Get all function overloads with the specified name
TableMetadataRef	getIndexTableMetadataRef(java.lang.String keyspace, java.lang.String index)
Keyspace	getKeyspaceInstance(java.lang.String keyspaceName) Get keyspace instance by name
KeyspaceMetadata	getKeyspaceMetadata(java.lang.String keyspaceName) Get metadata about keyspace by its name
java.util.Set<java.lang.String>	getKeyspaces()
java.util.List<java.lang.String>	getNonLocalStrategyKeyspaces()
com.google.common.collect.ImmutableList<java.lang.String>	getNonSystemKeyspaces()
int	getNumberOfTables()
TableMetadata	getTableMetadata(Descriptor descriptor)
TableMetadata	getTableMetadata(java.lang.String keyspace, java.lang.String table) Given a keyspace name and table name, get the table meta data.
TableMetadata	getTableMetadata(TableId id)
TableMetadataRef	getTableMetadataRef(Descriptor descriptor)
TableMetadataRef	getTableMetadataRef(java.lang.String keyspace, java.lang.String table) Given a keyspace name and table/view name, get the table metadata reference.
TableMetadataRef	getTableMetadataRef(TableId id) Get Table metadata by its identifier
java.lang.Iterable<TableMetadata>	getTablesAndViews(java.lang.String keyspaceName) Get metadata about keyspace inner ColumnFamilies
java.util.List<java.lang.String>	getUserKeyspaces()
java.util.UUID	getVersion()
ViewMetadata	getView(java.lang.String keyspaceName, java.lang.String viewName)
boolean	isEmpty() Checks whether the current schema is empty.
boolean	isSameVersion(java.util.UUID schemaVersion) Checks whether the given schema version is the same as the current local schema.
void	load(KeyspaceMetadata ksm) Update (or insert) new keyspace definition
void	loadFromDisk() load keyspace (keyspace) definitions, but do not initialize the keyspace instances.
void	loadFromDisk(boolean updateVersion) Load schema definitions from disk.
void	registerListener(SchemaChangeListener listener)
void	reloadSchemaAndAnnounceVersion()
Keyspace	removeKeyspaceInstance(java.lang.String keyspaceName) Remove keyspace from schema
static java.lang.String	schemaVersionToString(java.util.UUID version) Converts the given schema version to a string.
Keyspaces	snapshot()
void	storeKeyspaceInstance(Keyspace keyspace) Store given Keyspace instance to the schema
Schema.TransformationResult	transform(SchemaTransformation transformation, boolean locally, long now)
void	unregisterListener(SchemaChangeListener listener)
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()
TableMetadata	validateTable(java.lang.String keyspaceName, java.lang.String tableName)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.cassandra.schema.SchemaProvider

getExistingTableMetadata

Field Detail

instance

public static final Schema instance

Method Detail

loadFromDisk

public void loadFromDisk()

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

loadFromDisk

public void loadFromDisk(boolean updateVersion)

Load schema definitions from disk.

Parameters:

updateVersion - true if schema version needs to be updated

load

public void load(KeyspaceMetadata ksm)

Update (or insert) new keyspace definition

Parameters:

ksm - The metadata about keyspace

registerListener

public void registerListener(SchemaChangeListener listener)

unregisterListener

public void unregisterListener(SchemaChangeListener listener)

getKeyspaceInstance

public Keyspace getKeyspaceInstance(java.lang.String keyspaceName)

Get keyspace instance by name

Specified by:

getKeyspaceInstance in interface SchemaProvider

Parameters:

keyspaceName - The name of the keyspace

Returns:

Keyspace object or null if keyspace was not found

getColumnFamilyStoreInstance

public ColumnFamilyStore getColumnFamilyStoreInstance(TableId id)

storeKeyspaceInstance

public void storeKeyspaceInstance(Keyspace keyspace)

Store given Keyspace instance to the schema

Specified by:

storeKeyspaceInstance in interface SchemaProvider

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

snapshot

public Keyspaces snapshot()

getNumberOfTables

public int getNumberOfTables()

getView

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

getKeyspaceMetadata

public KeyspaceMetadata getKeyspaceMetadata(java.lang.String keyspaceName)

Get metadata about keyspace by its name

Specified by:

getKeyspaceMetadata in interface SchemaProvider

Parameters:

keyspaceName - The name of the keyspace

Returns:

The keyspace metadata or null if it wasn't found

getNonSystemKeyspaces

public com.google.common.collect.ImmutableList<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<TableMetadata> 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)

getTableMetadataRef

public TableMetadataRef getTableMetadataRef(java.lang.String keyspace,
                                            java.lang.String table)

Given a keyspace name and table/view name, get the table metadata reference. If the keyspace name or table/view name is not present this method returns null.

Specified by:

getTableMetadataRef in interface SchemaProvider

Returns:

TableMetadataRef object or null if it wasn't found

getIndexTableMetadataRef

public TableMetadataRef getIndexTableMetadataRef(java.lang.String keyspace,
                                                 java.lang.String index)

getTableMetadataRef

public TableMetadataRef getTableMetadataRef(TableId id)

Get Table metadata by its identifier

Specified by:

getTableMetadataRef in interface SchemaProvider

Parameters:

id - table or view identifier

Returns:

metadata about Table or View

getTableMetadataRef

public TableMetadataRef getTableMetadataRef(Descriptor descriptor)

Specified by:

getTableMetadataRef in interface SchemaProvider

getTableMetadata

public TableMetadata getTableMetadata(java.lang.String keyspace,
                                      java.lang.String table)

Given a keyspace name and table name, get the table meta data. If the keyspace name or table name is not valid this function returns null.

Specified by:

getTableMetadata in interface SchemaProvider

Parameters:

keyspace - The keyspace name

table - The table name

Returns:

TableMetadata object or null if it wasn't found

getTableMetadata

public TableMetadata getTableMetadata(TableId id)

Specified by:

getTableMetadata in interface SchemaProvider

validateTable

public TableMetadata validateTable(java.lang.String keyspaceName,
                                   java.lang.String tableName)

getTableMetadata

public TableMetadata getTableMetadata(Descriptor descriptor)

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

isSameVersion

public boolean isSameVersion(java.util.UUID schemaVersion)

Checks whether the given schema version is the same as the current local schema.

isEmpty

public boolean isEmpty()

Checks whether the current schema is empty.

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.

reloadSchemaAndAnnounceVersion

public void reloadSchemaAndAnnounceVersion()

transform

public Schema.TransformationResult transform(SchemaTransformation transformation,
                                             boolean locally,
                                             long now)

schemaVersionToString

public static java.lang.String schemaVersionToString(java.util.UUID version)

Converts the given schema version to a string. Returns unknown, if version is null or "(empty)", if version refers to an {@link SchemaConstants#emptyVersion empty) schema.