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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cassandra.config;
import java.util.*;
import java.util.stream.Collectors;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Sets;
import org.cliffc.high_scale_lib.NonBlockingHashMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.cql3.functions.*;
import org.apache.cassandra.db.ColumnFamilyStore;
import org.apache.cassandra.db.Keyspace;
import org.apache.cassandra.db.SystemKeyspace;
import org.apache.cassandra.db.commitlog.CommitLog;
import org.apache.cassandra.db.compaction.CompactionManager;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.db.marshal.UserType;
import org.apache.cassandra.gms.Gossiper;
import org.apache.cassandra.index.Index;
import org.apache.cassandra.io.sstable.Descriptor;
import org.apache.cassandra.locator.LocalStrategy;
import org.apache.cassandra.schema.*;
import org.apache.cassandra.service.MigrationManager;
import org.apache.cassandra.utils.ConcurrentBiMap;
import org.apache.cassandra.utils.Pair;
public class Schema
{
private static final Logger logger = LoggerFactory.getLogger(Schema.class);
public static final Schema instance = new Schema();
/* metadata map for faster keyspace lookup */
private final Map keyspaces = new NonBlockingHashMap<>();
/* Keyspace objects, one per keyspace. Only one instance should ever exist for any given keyspace. */
private final Map keyspaceInstances = new NonBlockingHashMap<>();
/* metadata map for faster ColumnFamily lookup */
private final ConcurrentBiMap, UUID> cfIdMap = new ConcurrentBiMap<>();
private volatile UUID version;
private volatile UUID altVersion;
/**
* Initialize empty schema object and load the hardcoded system tables
*/
public Schema()
{
if (DatabaseDescriptor.isDaemonInitialized() || DatabaseDescriptor.isToolInitialized())
{
load(SchemaKeyspace.metadata());
load(SystemKeyspace.metadata());
}
}
/**
* load keyspace (keyspace) definitions, but do not initialize the keyspace instances.
* Schema version may be updated as the result.
*/
public Schema loadFromDisk()
{
return loadFromDisk(true);
}
/**
* Load schema definitions from disk.
*
* @param updateVersion true if schema version needs to be updated
*/
public Schema loadFromDisk(boolean updateVersion)
{
load(SchemaKeyspace.fetchNonSystemKeyspaces());
if (updateVersion)
updateVersion();
return this;
}
/**
* Load up non-system keyspaces
*
* @param keyspaceDefs The non-system keyspace definitions
*
* @return self to support chaining calls
*/
public Schema load(Iterable keyspaceDefs)
{
keyspaceDefs.forEach(this::load);
return this;
}
/**
* Load specific keyspace into Schema
*
* @param keyspaceDef The keyspace to load up
*
* @return self to support chaining calls
*/
public Schema load(KeyspaceMetadata keyspaceDef)
{
keyspaceDef.tables.forEach(this::load);
keyspaceDef.views.forEach(this::load);
setKeyspaceMetadata(keyspaceDef);
return this;
}
/**
* Get keyspace instance by name
*
* @param keyspaceName The name of the keyspace
*
* @return Keyspace object or null if keyspace was not found
*/
public Keyspace getKeyspaceInstance(String keyspaceName)
{
return keyspaceInstances.get(keyspaceName);
}
/**
* 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
* @param ksNameAndCFName
* @return The named CFS or null if the keyspace, base table, or index don't exist
*/
public ColumnFamilyStore getColumnFamilyStoreIncludingIndexes(Pair ksNameAndCFName)
{
String ksName = ksNameAndCFName.left;
String cfName = ksNameAndCFName.right;
Pair baseTable;
/*
* Split does special case a one character regex, and it looks like it can detect
* if you use two characters to escape '.', but it still allocates a useless array.
*/
int indexOfSeparator = cfName.indexOf('.');
if (indexOfSeparator > -1)
baseTable = Pair.create(ksName, cfName.substring(0, indexOfSeparator));
else
baseTable = ksNameAndCFName;
UUID cfId = cfIdMap.get(baseTable);
if (cfId == null)
return null;
Keyspace ks = keyspaceInstances.get(ksName);
if (ks == null)
return null;
ColumnFamilyStore baseCFS = ks.getColumnFamilyStore(cfId);
//Not an index
if (indexOfSeparator == -1)
return baseCFS;
if (baseCFS == null)
return null;
Index index = baseCFS.indexManager.getIndexByName(cfName.substring(indexOfSeparator + 1, cfName.length()));
if (index == null)
return null;
//Shouldn't ask for a backing table if there is none so just throw?
//Or should it return null?
return index.getBackingTable().get();
}
public ColumnFamilyStore getColumnFamilyStoreInstance(UUID cfId)
{
Pair pair = cfIdMap.inverse().get(cfId);
if (pair == null)
return null;
Keyspace instance = getKeyspaceInstance(pair.left);
if (instance == null)
return null;
return instance.getColumnFamilyStore(cfId);
}
/**
* Store given Keyspace instance to the schema
*
* @param keyspace The Keyspace instance to store
*
* @throws IllegalArgumentException if Keyspace is already stored
*/
public void storeKeyspaceInstance(Keyspace keyspace)
{
if (keyspaceInstances.putIfAbsent(keyspace.getName(), keyspace) != null)
throw new IllegalArgumentException(String.format("Keyspace %s was already initialized.", keyspace.getName()));
}
/**
* Remove keyspace from schema
*
* @param keyspaceName The name of the keyspace to remove
*
* @return removed keyspace instance or null if it wasn't found
*/
public Keyspace removeKeyspaceInstance(String keyspaceName)
{
return keyspaceInstances.remove(keyspaceName);
}
/**
* Remove keyspace definition from system
*
* @param ksm The keyspace definition to remove
*/
public void clearKeyspaceMetadata(KeyspaceMetadata ksm)
{
keyspaces.remove(ksm.name);
}
/**
* 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.
*
* @param keyspaceName The keyspace name
* @param cfName The ColumnFamily name
*
* @return ColumnFamily Metadata object or null if it wasn't found
*/
public CFMetaData getCFMetaData(String keyspaceName, String cfName)
{
assert keyspaceName != null;
KeyspaceMetadata ksm = keyspaces.get(keyspaceName);
return ksm == null
? null
: ksm.getTableOrViewNullable(cfName);
}
/**
* Get ColumnFamily metadata by its identifier
*
* @param cfId The ColumnFamily identifier
*
* @return metadata about ColumnFamily
*/
public CFMetaData getCFMetaData(UUID cfId)
{
Pair cf = getCF(cfId);
return (cf == null) ? null : getCFMetaData(cf.left, cf.right);
}
public CFMetaData getCFMetaData(Descriptor descriptor)
{
return getCFMetaData(descriptor.ksname, descriptor.cfname);
}
public int getNumberOfTables()
{
return cfIdMap.size();
}
public ViewDefinition getView(String keyspaceName, String viewName)
{
assert keyspaceName != null;
KeyspaceMetadata ksm = keyspaces.get(keyspaceName);
return (ksm == null) ? null : ksm.views.getNullable(viewName);
}
/**
* Get metadata about keyspace by its name
*
* @param keyspaceName The name of the keyspace
*
* @return The keyspace metadata or null if it wasn't found
*/
public KeyspaceMetadata getKSMetaData(String keyspaceName)
{
assert keyspaceName != null;
return keyspaces.get(keyspaceName);
}
private Set getNonSystemKeyspacesSet()
{
return Sets.difference(keyspaces.keySet(), SchemaConstants.LOCAL_SYSTEM_KEYSPACE_NAMES);
}
/**
* @return 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)
*/
public List getNonSystemKeyspaces()
{
return ImmutableList.copyOf(getNonSystemKeyspacesSet());
}
/**
* @return a collection of keyspaces that do not use LocalStrategy for replication
*/
public List getNonLocalStrategyKeyspaces()
{
return keyspaces.values().stream()
.filter(keyspace -> keyspace.params.replication.klass != LocalStrategy.class)
.map(keyspace -> keyspace.name)
.collect(Collectors.toList());
}
/**
* @return collection of the user defined keyspaces
*/
public List getUserKeyspaces()
{
return ImmutableList.copyOf(Sets.difference(getNonSystemKeyspacesSet(), SchemaConstants.REPLICATED_SYSTEM_KEYSPACE_NAMES));
}
public Keyspaces getReplicatedKeyspaces()
{
Keyspaces.Builder builder = Keyspaces.builder();
keyspaces.values()
.stream()
.filter(k -> !SchemaConstants.isLocalSystemKeyspace(k.name))
.forEach(builder::add);
return builder.build();
}
/**
* Get metadata about keyspace inner ColumnFamilies
*
* @param keyspaceName The name of the keyspace
*
* @return metadata about ColumnFamilies the belong to the given keyspace
*/
public Iterable getTablesAndViews(String keyspaceName)
{
assert keyspaceName != null;
KeyspaceMetadata ksm = keyspaces.get(keyspaceName);
assert ksm != null;
return ksm.tablesAndViews();
}
/**
* @return collection of the all keyspace names registered in the system (system and non-system)
*/
public Set getKeyspaces()
{
return keyspaces.keySet();
}
public Keyspaces getKeyspaces(Set includedKeyspaceNames)
{
Keyspaces.Builder builder = Keyspaces.builder();
keyspaces.values()
.stream()
.filter(k -> includedKeyspaceNames.contains(k.name))
.forEach(builder::add);
return builder.build();
}
/**
* Update (or insert) new keyspace definition
*
* @param ksm The metadata about keyspace
*/
public void setKeyspaceMetadata(KeyspaceMetadata ksm)
{
assert ksm != null;
keyspaces.put(ksm.name, ksm);
Keyspace keyspace = getKeyspaceInstance(ksm.name);
if (keyspace != null)
keyspace.setMetadata(ksm);
}
/* ColumnFamily query/control methods */
/**
* @param cfId The identifier of the ColumnFamily to lookup
* @return The (ksname,cfname) pair for the given id, or null if it has been dropped.
*/
public Pair getCF(UUID cfId)
{
return cfIdMap.inverse().get(cfId);
}
/**
* @param ksAndCFName The identifier of the ColumnFamily to lookup
* @return true if the KS and CF pair is a known one, false otherwise.
*/
public boolean hasCF(Pair ksAndCFName)
{
return cfIdMap.containsKey(ksAndCFName);
}
/**
* Lookup keyspace/ColumnFamily identifier
*
* @param ksName The keyspace name
* @param cfName The ColumnFamily name
*
* @return The id for the given (ksname,cfname) pair, or null if it has been dropped.
*/
public UUID getId(String ksName, String cfName)
{
return cfIdMap.get(Pair.create(ksName, cfName));
}
/**
* Load individual ColumnFamily Definition to the schema
* (to make ColumnFamily lookup faster)
*
* @param cfm The ColumnFamily definition to load
*/
public void load(CFMetaData cfm)
{
Pair key = Pair.create(cfm.ksName, cfm.cfName);
if (cfIdMap.containsKey(key))
throw new RuntimeException(String.format("Attempting to load already loaded table %s.%s", cfm.ksName, cfm.cfName));
logger.debug("Adding {} to cfIdMap", cfm);
cfIdMap.put(key, cfm.cfId);
}
/**
* Load individual View Definition to the schema
* (to make View lookup faster)
*
* @param view The View definition to load
*/
public void load(ViewDefinition view)
{
CFMetaData cfm = view.metadata;
Pair key = Pair.create(cfm.ksName, cfm.cfName);
if (cfIdMap.containsKey(key))
throw new RuntimeException(String.format("Attempting to load already loaded view %s.%s", cfm.ksName, cfm.cfName));
logger.debug("Adding {} to cfIdMap", cfm);
cfIdMap.put(key, cfm.cfId);
}
/**
* Used for ColumnFamily data eviction out from the schema
*
* @param cfm The ColumnFamily Definition to evict
*/
public void unload(CFMetaData cfm)
{
cfIdMap.remove(Pair.create(cfm.ksName, cfm.cfName));
}
/**
* Used for View eviction from the schema
*
* @param view The view definition to evict
*/
private void unload(ViewDefinition view)
{
cfIdMap.remove(Pair.create(view.ksName, view.viewName));
}
/* Function helpers */
/**
* Get all function overloads with the specified name
*
* @param name fully qualified function name
* @return an empty list if the keyspace or the function name are not found;
* a non-empty collection of {@link Function} otherwise
*/
public Collection getFunctions(FunctionName name)
{
if (!name.hasKeyspace())
throw new IllegalArgumentException(String.format("Function name must be fully quallified: got %s", name));
KeyspaceMetadata ksm = getKSMetaData(name.keyspace);
return ksm == null
? Collections.emptyList()
: ksm.functions.get(name);
}
/**
* Find the function with the specified name
*
* @param name fully qualified function name
* @param argTypes function argument types
* @return an empty {@link Optional} if the keyspace or the function name are not found;
* a non-empty optional of {@link Function} otherwise
*/
public Optional findFunction(FunctionName name, List> argTypes)
{
if (!name.hasKeyspace())
throw new IllegalArgumentException(String.format("Function name must be fully quallified: got %s", name));
KeyspaceMetadata ksm = getKSMetaData(name.keyspace);
return ksm == null
? Optional.empty()
: ksm.functions.find(name, argTypes);
}
/* Version control */
/**
* The schema version to announce.
* This will be either the "real" schema version including the {@code cdc} column,
* if no node in the cluster is running at 3.0, or a 3.0 compatible
* schema version, with the {@code cdc} column excluded, if at least one node is
* running 3.0.
*
* @return "current" schema version
*/
public UUID getVersion()
{
return Gossiper.instance.isEnabled() && Gossiper.instance.isAnyNodeOn30()
? altVersion
: version;
}
/**
* The 3.11 schema version, always includes the {@code cdc} column.
*/
public UUID getRealVersion()
{
return version;
}
/**
* The "alternative" schema version, compatible to 3.0, always excludes the
* {@code cdc} column.
*/
public UUID getAltVersion()
{
return altVersion;
}
/**
* Checks whether the given schema version is the same as the current local schema
* version, either the 3.0 compatible or "real" one.
*/
public boolean isSameVersion(UUID schemaVersion)
{
return schemaVersion != null
&& (schemaVersion.equals(version) || schemaVersion.equals(altVersion));
}
/**
* Checks whether the current schema is empty.
*/
public boolean isEmpty()
{
return SchemaConstants.emptyVersion.equals(version);
}
/**
* 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.
*
* 3.11 note: we calculate the "real" schema version and the 3.0 compatible schema
* version here.
*/
public void updateVersion()
{
Pair mixedVersions = SchemaKeyspace.calculateSchemaDigest();
version = mixedVersions.left;
altVersion = mixedVersions.right;
SystemKeyspace.updateSchemaVersion(getVersion());
}
/**
* Like updateVersion, but also announces via gossip
*
* 3.11 note: we announce the "current" schema version, which can be either the 3.0
* compatible one, if at least one node is still running 3.0, or the "real" schema version.
*/
public void updateVersionAndAnnounce()
{
updateVersion();
UUID current = getVersion();
MigrationManager.passiveAnnounce(current, current == getAltVersion());
}
/**
* Clear all KS/CF metadata and reset version.
*/
public synchronized void clear()
{
for (String keyspaceName : getNonSystemKeyspaces())
{
KeyspaceMetadata ksm = getKSMetaData(keyspaceName);
ksm.tables.forEach(this::unload);
ksm.views.forEach(this::unload);
clearKeyspaceMetadata(ksm);
}
updateVersionAndAnnounce();
}
public void addKeyspace(KeyspaceMetadata ksm)
{
assert getKSMetaData(ksm.name) == null;
load(ksm);
Keyspace.open(ksm.name);
MigrationManager.instance.notifyCreateKeyspace(ksm);
}
public void updateKeyspace(String ksName, KeyspaceParams newParams)
{
KeyspaceMetadata ksm = update(ksName, ks -> ks.withSwapped(newParams));
MigrationManager.instance.notifyUpdateKeyspace(ksm);
}
public void dropKeyspace(String ksName)
{
KeyspaceMetadata ksm = Schema.instance.getKSMetaData(ksName);
String snapshotName = Keyspace.getTimestampedSnapshotNameWithPrefix(ksName, ColumnFamilyStore.SNAPSHOT_DROP_PREFIX);
CompactionManager.instance.interruptCompactionFor(ksm.tablesAndViews(), true);
Keyspace keyspace = Keyspace.open(ksm.name);
// remove all cfs from the keyspace instance.
List droppedCfs = new ArrayList<>();
for (CFMetaData cfm : ksm.tablesAndViews())
{
ColumnFamilyStore cfs = keyspace.getColumnFamilyStore(cfm.cfName);
unload(cfm);
if (DatabaseDescriptor.isAutoSnapshot())
cfs.snapshot(snapshotName);
Keyspace.open(ksm.name).dropCf(cfm.cfId);
droppedCfs.add(cfm.cfId);
}
synchronized (Keyspace.class) {
// Remove the keyspace from the static instances.
Keyspace.clear(ksm.name);
clearKeyspaceMetadata(ksm);
}
Keyspace.writeOrder.awaitNewBarrier();
// force a new segment in the CL
CommitLog.instance.forceRecycleAllSegments(droppedCfs);
MigrationManager.instance.notifyDropKeyspace(ksm);
}
public void addTable(CFMetaData cfm)
{
assert getCFMetaData(cfm.ksName, cfm.cfName) == null;
// Make sure the keyspace is initialized
// and init the new CF before switching the KSM to the new one
// to avoid races as in CASSANDRA-10761
Keyspace.open(cfm.ksName).initCf(cfm, true);
// Update the keyspaces map with the updated metadata
update(cfm.ksName, ks -> ks.withSwapped(ks.tables.with(cfm)));
// Update the table ID <-> table name map (cfIdMap)
load(cfm);
MigrationManager.instance.notifyCreateColumnFamily(cfm);
}
public void updateTable(CFMetaData table)
{
CFMetaData current = getCFMetaData(table.ksName, table.cfName);
assert current != null;
boolean changeAffectsStatements = current.apply(table);
Keyspace keyspace = Keyspace.open(current.ksName);
keyspace.getColumnFamilyStore(current.cfName).reload();
MigrationManager.instance.notifyUpdateColumnFamily(current, changeAffectsStatements);
}
public void dropTable(String ksName, String tableName)
{
KeyspaceMetadata oldKsm = getKSMetaData(ksName);
assert oldKsm != null;
ColumnFamilyStore cfs = Keyspace.open(ksName).getColumnFamilyStore(tableName);
assert cfs != null;
// make sure all the indexes are dropped, or else.
cfs.indexManager.markAllIndexesRemoved();
// reinitialize the keyspace.
CFMetaData cfm = oldKsm.tables.get(tableName).get();
KeyspaceMetadata newKsm = oldKsm.withSwapped(oldKsm.tables.without(tableName));
unload(cfm);
setKeyspaceMetadata(newKsm);
CompactionManager.instance.interruptCompactionFor(Collections.singleton(cfm), true);
if (DatabaseDescriptor.isAutoSnapshot())
cfs.snapshot(Keyspace.getTimestampedSnapshotNameWithPrefix(cfs.name, ColumnFamilyStore.SNAPSHOT_DROP_PREFIX));
Keyspace.open(ksName).dropCf(cfm.cfId);
MigrationManager.instance.notifyDropColumnFamily(cfm);
CommitLog.instance.forceRecycleAllSegments(Collections.singleton(cfm.cfId));
}
public void addView(ViewDefinition view)
{
assert getCFMetaData(view.ksName, view.viewName) == null;
Keyspace keyspace = Keyspace.open(view.ksName);
// Make sure the keyspace is initialized and initialize the table.
keyspace.initCf(view.metadata, true);
// Update the keyspaces map with the updated metadata
update(view.ksName, ks -> ks.withSwapped(ks.views.with(view)));
// Update the table ID <-> table name map (cfIdMap)
load(view);
keyspace.viewManager.reload();
MigrationManager.instance.notifyCreateView(view);
}
public void updateView(ViewDefinition view)
{
ViewDefinition current = getKSMetaData(view.ksName).views.get(view.viewName).get();
boolean changeAffectsStatements = current.metadata.apply(view.metadata);
Keyspace keyspace = Keyspace.open(current.ksName);
keyspace.getColumnFamilyStore(current.viewName).reload();
Keyspace.open(current.ksName).viewManager.update(current.viewName);
MigrationManager.instance.notifyUpdateView(current, changeAffectsStatements);
}
public void dropView(String ksName, String viewName)
{
KeyspaceMetadata oldKsm = getKSMetaData(ksName);
assert oldKsm != null;
ColumnFamilyStore cfs = Keyspace.open(ksName).getColumnFamilyStore(viewName);
assert cfs != null;
// make sure all the indexes are dropped, or else.
cfs.indexManager.markAllIndexesRemoved();
CompactionManager.instance.interruptCompactionFor(Collections.singleton(cfs.metadata), true);
if (DatabaseDescriptor.isAutoSnapshot())
cfs.snapshot(Keyspace.getTimestampedSnapshotNameWithPrefix(cfs.name, ColumnFamilyStore.SNAPSHOT_DROP_PREFIX));
// reinitialize the keyspace.
ViewDefinition view = oldKsm.views.get(viewName).get();
KeyspaceMetadata newKsm = oldKsm.withSwapped(oldKsm.views.without(viewName));
unload(view);
setKeyspaceMetadata(newKsm);
Keyspace.open(ksName).dropCf(view.metadata.cfId);
Keyspace.open(ksName).viewManager.reload();
MigrationManager.instance.notifyDropView(view);
CommitLog.instance.forceRecycleAllSegments(Collections.singleton(view.metadata.cfId));
}
public void addType(UserType ut)
{
update(ut.keyspace, ks -> ks.withSwapped(ks.types.with(ut)));
MigrationManager.instance.notifyCreateUserType(ut);
}
public void updateType(UserType ut)
{
update(ut.keyspace, ks -> ks.withSwapped(ks.types.without(ut.name).with(ut)));
MigrationManager.instance.notifyUpdateUserType(ut);
}
public void dropType(UserType ut)
{
update(ut.keyspace, ks -> ks.withSwapped(ks.types.without(ut.name)));
MigrationManager.instance.notifyDropUserType(ut);
}
public void addFunction(UDFunction udf)
{
update(udf.name().keyspace, ks -> ks.withSwapped(ks.functions.with(udf)));
MigrationManager.instance.notifyCreateFunction(udf);
}
public void updateFunction(UDFunction udf)
{
update(udf.name().keyspace, ks -> ks.withSwapped(ks.functions.without(udf.name(), udf.argTypes()).with(udf)));
MigrationManager.instance.notifyUpdateFunction(udf);
}
public void dropFunction(UDFunction udf)
{
update(udf.name().keyspace, ks -> ks.withSwapped(ks.functions.without(udf.name(), udf.argTypes())));
MigrationManager.instance.notifyDropFunction(udf);
}
public void addAggregate(UDAggregate uda)
{
update(uda.name().keyspace, ks -> ks.withSwapped(ks.functions.with(uda)));
MigrationManager.instance.notifyCreateAggregate(uda);
}
public void updateAggregate(UDAggregate uda)
{
update(uda.name().keyspace, ks -> ks.withSwapped(ks.functions.without(uda.name(), uda.argTypes()).with(uda)));
MigrationManager.instance.notifyUpdateAggregate(uda);
}
public void dropAggregate(UDAggregate uda)
{
update(uda.name().keyspace, ks -> ks.withSwapped(ks.functions.without(uda.name(), uda.argTypes())));
MigrationManager.instance.notifyDropAggregate(uda);
}
private synchronized KeyspaceMetadata update(String keyspaceName, java.util.function.Function transformation)
{
KeyspaceMetadata current = getKSMetaData(keyspaceName);
if (current == null)
throw new IllegalStateException(String.format("Keyspace %s doesn't exist", keyspaceName));
KeyspaceMetadata transformed = transformation.apply(current);
setKeyspaceMetadata(transformed);
return transformed;
}
/**
* Converts the given schema version to a string. Returns {@code unknown}, if {@code version} is {@code null}
* or {@code "(empty)"}, if {@code version} refers to an {@link SchemaConstants#emptyVersion empty) schema.
*/
public static String schemaVersionToString(UUID version)
{
return version == null
? "unknown"
: SchemaConstants.emptyVersion.equals(version)
? "(empty)"
: version.toString();
}
}
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