/*
* Copyright 2011 The Apache Software Foundation
*
* 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.lealone.cassandra.command.ddl;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.config.KSMetaData;
import org.apache.cassandra.config.Schema;
import org.apache.cassandra.cql3.statements.KSPropDefs;
import org.apache.cassandra.db.Keyspace;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.locator.AbstractReplicationStrategy;
import org.apache.cassandra.service.MigrationManager;
import org.apache.cassandra.service.StorageService;
import org.lealone.cassandra.command.CommandConstants;
import org.lealone.command.ddl.DefineCommand;
import org.lealone.dbobject.User;
import org.lealone.engine.Session;
import org.lealone.message.DbException;
public class AlterKeyspace extends DefineCommand {
private String keyspaceName;
private KSPropDefs defs;
public AlterKeyspace(Session session) {
super(session);
}
public void setKeyspaceName(String keyspaceName) {
this.keyspaceName = keyspaceName;
}
public void setKSPropDefs(KSPropDefs defs) {
this.defs = defs;
}
@Override
public int getType() {
return CommandConstants.ALTER_KEYSPACE;
}
@Override
public int update() {
session.getUser().checkAdmin();
session.commit(true);
User user = session.getUser();
user.checkAdmin();
try {
KSMetaData ksm = Schema.instance.getKSMetaData(keyspaceName);
// In the (very) unlikely case the keyspace was dropped since validate()
if (ksm == null) //validate方法中已检查过了，如果存在一些并发场景，有可能在validate方法到这里之间把ks删除了
throw new InvalidRequestException("Unknown keyspace " + keyspaceName);
MigrationManager.announceKeyspaceUpdate(defs.asKSMetadataUpdate(ksm), false);
} catch (Exception e) {
throw DbException.convert(e);
}
return 0;
}
public void validate() {
try {
KSMetaData ksm = Schema.instance.getKSMetaData(keyspaceName);
if (ksm == null)
throw new InvalidRequestException("Unknown keyspace " + keyspaceName);
if (ksm.name.equalsIgnoreCase(Keyspace.SYSTEM_KS))
throw new InvalidRequestException("Cannot alter system keyspace");
if (defs.getReplicationStrategyClass() == null && !defs.getReplicationOptions().isEmpty()) {
throw new ConfigurationException("Missing replication strategy class");
} else if (defs.getReplicationStrategyClass() != null) {
// The strategy is validated through KSMetaData.validate() in announceKeyspaceUpdate below.
// However, for backward compatibility with thrift, this doesn't validate unexpected options yet,
// so doing proper validation here.
AbstractReplicationStrategy.validateReplicationStrategy(keyspaceName,
AbstractReplicationStrategy.getClass(defs.getReplicationStrategyClass()),
StorageService.instance.getTokenMetadata(), DatabaseDescriptor.getEndpointSnitch(),
defs.getReplicationOptions());
}
} catch (Exception e) {
throw DbException.convert(e);
}
}
}