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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.
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/*
 * 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.cleanup;

import java.util.Collection;
import java.util.List;
import java.util.concurrent.Executor;
import java.util.function.Consumer;

import com.google.common.base.Preconditions;
import com.google.common.collect.Iterables;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.cassandra.concurrent.ScheduledExecutors;
import org.apache.cassandra.db.Keyspace;
import org.apache.cassandra.dht.Range;
import org.apache.cassandra.dht.Token;
import org.apache.cassandra.gms.EndpointState;
import org.apache.cassandra.gms.Gossiper;
import org.apache.cassandra.locator.InetAddressAndPort;
import org.apache.cassandra.locator.RangesAtEndpoint;
import org.apache.cassandra.schema.Schema;
import org.apache.cassandra.schema.TableId;
import org.apache.cassandra.schema.TableMetadata;
import org.apache.cassandra.service.StorageService;
import org.apache.cassandra.service.paxos.Ballot;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.concurrent.AsyncFuture;
import org.apache.cassandra.utils.concurrent.Future;

import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static org.apache.cassandra.config.DatabaseDescriptor.getCasContentionTimeout;
import static org.apache.cassandra.config.DatabaseDescriptor.getWriteRpcTimeout;
import static org.apache.cassandra.utils.FBUtilities.getBroadcastAddressAndPort;

public class PaxosCleanup extends AsyncFuture implements Runnable
{
    private static final Logger logger = LoggerFactory.getLogger(PaxosCleanup.class);

    private final Collection endpoints;
    private final TableMetadata table;
    private final Collection> ranges;
    private final boolean skippedReplicas;
    private final Executor executor;

    // references kept for debugging
    private PaxosStartPrepareCleanup startPrepare;
    private PaxosFinishPrepareCleanup finishPrepare;
    private PaxosCleanupSession session;
    private PaxosCleanupComplete complete;

    public PaxosCleanup(Collection endpoints, TableMetadata table, Collection> ranges, boolean skippedReplicas, Executor executor)
    {
        this.endpoints = endpoints;
        this.table = table;
        this.ranges = ranges;
        this.skippedReplicas = skippedReplicas;
        this.executor = executor;
    }

    private  void addCallback(Future future, Consumer onComplete)
    {
        future.addCallback(onComplete, this::tryFailure);
    }

    public static PaxosCleanup cleanup(Collection endpoints, TableMetadata table, Collection> ranges, boolean skippedReplicas, Executor executor)
    {
        PaxosCleanup cleanup = new PaxosCleanup(endpoints, table, ranges, skippedReplicas, executor);
        executor.execute(cleanup);
        return cleanup;
    }

    public void run()
    {
        EndpointState localEpState = Gossiper.instance.getEndpointStateForEndpoint(getBroadcastAddressAndPort());
        startPrepare = PaxosStartPrepareCleanup.prepare(table.id, endpoints, localEpState, ranges);
        addCallback(startPrepare, this::finishPrepare);
    }

    private void finishPrepare(PaxosCleanupHistory result)
    {
        ScheduledExecutors.nonPeriodicTasks.schedule(() -> {
            finishPrepare = PaxosFinishPrepareCleanup.finish(endpoints, result);
            addCallback(finishPrepare, (v) -> startSession(result.highBound));
        }, Math.min(getCasContentionTimeout(MILLISECONDS), getWriteRpcTimeout(MILLISECONDS)), MILLISECONDS);
    }

    private void startSession(Ballot lowBound)
    {
        session = new PaxosCleanupSession(endpoints, table.id, ranges);
        addCallback(session, (v) -> finish(lowBound));
        executor.execute(session);
    }

    private void finish(Ballot lowBound)
    {
        complete = new PaxosCleanupComplete(endpoints, table.id, ranges, lowBound, skippedReplicas);
        addCallback(complete, this::trySuccess);
        executor.execute(complete);
    }

    private static boolean isOutOfRange(String ksName, Collection> repairRanges)
    {
        Keyspace keyspace = Keyspace.open(ksName);
        List> localRanges = Range.normalize(keyspace.getReplicationStrategy()
                                                                 .getAddressReplicas()
                                                                 .get(FBUtilities.getBroadcastAddressAndPort())
                                                                 .ranges());

        RangesAtEndpoint pendingRanges = StorageService.instance.getTokenMetadata().getPendingRanges(ksName, FBUtilities.getBroadcastAddressAndPort());
        if (!pendingRanges.isEmpty())
        {
            localRanges.addAll(pendingRanges.ranges());
            localRanges = Range.normalize(localRanges);
        }

        for (Range repairRange : Range.normalize(repairRanges))
        {
            if (!Iterables.any(localRanges, localRange -> localRange.contains(repairRange)))
                return true;
        }
        return false;
    }

    static boolean isInRangeAndShouldProcess(Collection> ranges, TableId tableId)
    {
        TableMetadata metadata = Schema.instance.getTableMetadata(tableId);

        Keyspace keyspace = Keyspace.open(metadata.keyspace);
        Preconditions.checkNotNull(keyspace);

        if (!isOutOfRange(metadata.keyspace, ranges))
            return true;

        logger.warn("Out of range PaxosCleanup request for {}: {}", metadata, ranges);
        return false;
    }
}