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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.repair;

import java.util.List;

import com.google.common.base.Preconditions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.cassandra.dht.Range;
import org.apache.cassandra.dht.Token;
import org.apache.cassandra.exceptions.RepairException;
import org.apache.cassandra.locator.InetAddressAndPort;
import org.apache.cassandra.net.Message;
import org.apache.cassandra.net.MessagingService;
import org.apache.cassandra.repair.messages.RepairMessage;
import org.apache.cassandra.repair.messages.SyncRequest;
import org.apache.cassandra.streaming.PreviewKind;
import org.apache.cassandra.streaming.SessionSummary;
import org.apache.cassandra.tracing.Tracing;
import org.apache.cassandra.utils.FBUtilities;

import static org.apache.cassandra.net.Verb.SYNC_REQ;

/**
 * SymmetricRemoteSyncTask sends {@link SyncRequest} to remote(non-coordinator) node
 * to repair(stream) data with other replica.
 *
 * When SymmetricRemoteSyncTask receives SyncComplete from remote node, task completes.
 */
public class SymmetricRemoteSyncTask extends SyncTask implements CompletableRemoteSyncTask
{
    private static final Logger logger = LoggerFactory.getLogger(SymmetricRemoteSyncTask.class);

    public SymmetricRemoteSyncTask(RepairJobDesc desc, InetAddressAndPort r1, InetAddressAndPort r2, List> differences, PreviewKind previewKind)
    {
        super(desc, r1, r2, differences, previewKind);
    }

    void sendRequest(SyncRequest request, InetAddressAndPort to)
    {
        MessagingService.instance().send(Message.out(SYNC_REQ, request), to);
    }

    @Override
    protected void startSync()
    {
        InetAddressAndPort local = FBUtilities.getBroadcastAddressAndPort();

        SyncRequest request = new SyncRequest(desc, local, nodePair.coordinator, nodePair.peer, rangesToSync, previewKind, false);
        Preconditions.checkArgument(nodePair.coordinator.equals(request.src));
        String message = String.format("Forwarding streaming repair of %d ranges to %s (to be streamed with %s)", request.ranges.size(), request.src, request.dst);
        logger.info("{} {}", previewKind.logPrefix(desc.sessionId), message);
        Tracing.traceRepair(message);
        sendRequest(request, request.src);
    }

    public void syncComplete(boolean success, List summaries)
    {
        if (success)
        {
            set(stat.withSummaries(summaries));
        }
        else
        {
            setException(new RepairException(desc, previewKind, String.format("Sync failed between %s and %s", nodePair.coordinator, nodePair.peer)));
        }
        finished();
    }

    @Override
    public String toString()
    {
        return "SymmetricRemoteSyncTask{" +
               "rangesToSync=" + rangesToSync +
               ", nodePair=" + nodePair +
               '}';
    }
}