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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.service.paxos;
import java.util.Collection;
import org.apache.cassandra.db.SystemKeyspace;
import org.apache.cassandra.dht.Range;
import org.apache.cassandra.dht.Token;
public class TablePaxosRepairHistory
{
private final String keyspace;
private final String table;
private volatile PaxosRepairHistory history;
private TablePaxosRepairHistory(String keyspace, String table, PaxosRepairHistory history)
{
this.keyspace = keyspace;
this.table = table;
this.history = history;
}
public static TablePaxosRepairHistory load(String keyspace, String table)
{
return new TablePaxosRepairHistory(keyspace, table, SystemKeyspace.loadPaxosRepairHistory(keyspace, table));
}
public Ballot getBallotForToken(Token token)
{
return history.ballotForToken(token);
}
private void updatePaxosRepairTable(PaxosRepairHistory update, boolean flush)
{
SystemKeyspace.savePaxosRepairHistory(keyspace, table, update, flush);
}
public synchronized void add(Collection> ranges, Ballot ballot, boolean flush)
{
PaxosRepairHistory update = PaxosRepairHistory.add(history, ranges, ballot);
updatePaxosRepairTable(update, flush);
history = update;
}
public synchronized void merge(PaxosRepairHistory toMerge, boolean flush)
{
PaxosRepairHistory update = PaxosRepairHistory.merge(history, toMerge);
if (!update.equals(history))
updatePaxosRepairTable(update, flush);
history = update;
}
public PaxosRepairHistory getHistory()
{
return history;
}
public PaxosRepairHistory getHistoryForRanges(Collection> ranges)
{
return PaxosRepairHistory.trim(history, ranges);
}
}