Package org.apache.cassandra.schema

Class SchemaKeyspace

java.lang.Object

org.apache.cassandra.schema.SchemaKeyspace

@NotThreadSafe
public final class SchemaKeyspace
extends java.lang.Object

system_schema.* tables and methods for manipulating them. Please notice this class is _not_ thread safe and all methods which reads or updates the data in schema keyspace should be accessed only from the implementation of SchemaUpdateHandler in synchronized blocks.

Method Summary

Modifier and Type	Method	Description
static java.util.UUID	calculateSchemaDigest()	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.
static ColumnMetadata	createColumnFromRow(UntypedResultSet.Row row, Types types, UserFunctions functions)
static Keyspaces	fetchNonSystemKeyspaces()
static KeyspaceMetadata	metadata()

Methods inherited from class java.lang.Object

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

Method Detail

metadata

public static KeyspaceMetadata metadata()

calculateSchemaDigest

public static java.util.UUID calculateSchemaDigest()

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.

fetchNonSystemKeyspaces

public static Keyspaces fetchNonSystemKeyspaces()

createColumnFromRow

public static ColumnMetadata createColumnFromRow(UntypedResultSet.Row row,
                                                 Types types,
                                                 UserFunctions functions)