/**
* 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 com.alibaba.wasp.master.handler;
import com.alibaba.wasp.EntityGroupInfo;
import com.alibaba.wasp.Server;
import com.alibaba.wasp.TableLockedException;
import com.alibaba.wasp.master.FMasterServices;
import com.alibaba.wasp.master.TableLockManager;
import com.alibaba.wasp.meta.FMetaEditor;
import com.alibaba.wasp.meta.FTable;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.io.IOException;
import java.util.List;
/**
* Handler to modify a table.
*/
public class ModifyTableHandler extends TableEventHandler {
private static final Log LOG = LogFactory.getLog(ModifyTableHandler.class);
private final FTable table;
private TableLockManager tableLockManager;
public ModifyTableHandler(final byte[] tableName, final FTable table,
Server server, FMasterServices fMasterServices) throws IOException {
super(tableName, server, fMasterServices, EventType.C_M_MODIFY_TABLE);
// Check table exists.
getTable();
// This is the new schema we are going to write out as this modification.
this.table = table;
this.tableLockManager = fMasterServices.getTableLockManager();
if (tableLockManager.lockTable(tableNameStr)) {
LOG.info("lock table '" + tableNameStr + "' by ModifyTableHandler");
} else {
throw new TableLockedException(tableNameStr + " has been locked. ");
}
}
@Override
protected void handleTableOperation(List<EntityGroupInfo> egis)
throws IOException {
try {
// Update table info
FMetaEditor.alterTable(server.getConfiguration(), tableNameStr,
this.table);
} finally {
tableLockManager.unlockTable(tableNameStr);
}
}
@Override
public String toString() {
String name = "UnknownServerName";
if (server != null && server.getServerName() != null) {
name = server.getServerName().toString();
}
return getClass().getSimpleName() + "-" + name + "-" + getSeqid() + "-"
+ tableNameStr;
}
}