/**
* 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.hadoop.hbase.backup.example;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Monitor the actual tables for which HFiles are archived for long-term retention (always kept
* unless ZK state changes).
* <p>
* It is internally synchronized to ensure consistent view of the table state.
*/
public class HFileArchiveTableMonitor {
private static final Log LOG = LogFactory.getLog(HFileArchiveTableMonitor.class);
private final Set<String> archivedTables = new TreeSet<String>();
/**
* Set the tables to be archived. Internally adds each table and attempts to
* register it.
* <p>
* <b>Note: All previous tables will be removed in favor of these tables.<b>
* @param tables add each of the tables to be archived.
*/
public synchronized void setArchiveTables(List<String> tables) {
archivedTables.clear();
archivedTables.addAll(tables);
}
/**
* Add the named table to be those being archived. Attempts to register the
* table
* @param table name of the table to be registered
*/
public synchronized void addTable(String table) {
if (this.shouldArchiveTable(table)) {
LOG.debug("Already archiving table: " + table + ", ignoring it");
return;
}
archivedTables.add(table);
}
public synchronized void removeTable(String table) {
archivedTables.remove(table);
}
public synchronized void clearArchive() {
archivedTables.clear();
}
/**
* Determine if the given table should or should not allow its hfiles to be deleted in the archive
* @param tableName name of the table to check
* @return <tt>true</tt> if its store files should be retained, <tt>false</tt> otherwise
*/
public synchronized boolean shouldArchiveTable(String tableName) {
return archivedTables.contains(tableName);
}
}