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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.consistent;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import com.google.common.base.Preconditions;

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

import org.apache.cassandra.net.Message;
import org.apache.cassandra.repair.SharedContext;
import org.apache.cassandra.locator.InetAddressAndPort;
import org.apache.cassandra.repair.messages.FailSession;
import org.apache.cassandra.repair.messages.FinalizePromise;
import org.apache.cassandra.repair.messages.PrepareConsistentResponse;
import org.apache.cassandra.repair.messages.RepairMessage;
import org.apache.cassandra.service.ActiveRepairService;
import org.apache.cassandra.repair.NoSuchRepairSessionException;
import org.apache.cassandra.utils.TimeUUID;

import static org.apache.cassandra.repair.messages.RepairMessage.sendFailureResponse;

/**
 * Container for all consistent repair sessions a node is coordinating
 */
public class CoordinatorSessions
{
    private static final Logger logger = LoggerFactory.getLogger(CoordinatorSessions.class);
    private final SharedContext ctx;
    
    private final Map sessions = new HashMap<>();

    public CoordinatorSessions(SharedContext ctx)
    {
        this.ctx = ctx;
    }

    protected CoordinatorSession buildSession(CoordinatorSession.Builder builder)
    {
        return new CoordinatorSession(builder);
    }

    public synchronized CoordinatorSession registerSession(TimeUUID sessionId, Set participants, boolean isForced) throws NoSuchRepairSessionException
    {
        ActiveRepairService.ParentRepairSession prs = ctx.repair().getParentRepairSession(sessionId);

        Preconditions.checkArgument(!sessions.containsKey(sessionId),
                                    "A coordinator already exists for session %s", sessionId);
        Preconditions.checkArgument(!isForced || prs.repairedAt == ActiveRepairService.UNREPAIRED_SSTABLE,
                                    "cannot promote data for forced incremental repairs");

        CoordinatorSession.Builder builder = CoordinatorSession.builder(ctx);
        builder.withState(ConsistentSession.State.PREPARING);
        builder.withSessionID(sessionId);
        builder.withCoordinator(prs.coordinator);

        builder.withTableIds(prs.getTableIds());
        builder.withRepairedAt(prs.repairedAt);
        builder.withRanges(prs.getRanges());
        builder.withParticipants(participants);
        builder.withListener(this::onSessionStateUpdate);
        builder.withContext(ctx);
        CoordinatorSession session = buildSession(builder);
        sessions.put(session.sessionID, session);
        return session;
    }

    public synchronized CoordinatorSession getSession(TimeUUID sessionId)
    {
        return sessions.get(sessionId);
    }

    public synchronized void onSessionStateUpdate(CoordinatorSession session)
    {
        if (session.isCompleted())
        {
            logger.info("Removing completed session {} with state {}", session.sessionID, session.getState());
            sessions.remove(session.sessionID);
        }
    }

    public void handlePrepareResponse(Message msg)
    {
        PrepareConsistentResponse payload = (PrepareConsistentResponse) msg.payload;
        CoordinatorSession session = getSession(payload.parentSession);
        if (session != null)
        {
            session.handlePrepareResponse((Message) msg);
        }
        else
        {
            sendFailureResponse(ctx, msg);
        }
    }

    public void handleFinalizePromiseMessage(Message message)
    {
        FinalizePromise msg = (FinalizePromise) message.payload;
        CoordinatorSession session = getSession(msg.sessionID);
        if (session != null)
        {
            session.handleFinalizePromise((Message) message);
        }
        else
        {
            sendFailureResponse(ctx, message);
        }
    }

    public void handleFailSessionMessage(FailSession msg)
    {
        CoordinatorSession session = getSession(msg.sessionID);
        if (session != null)
        {
            session.fail();
        }
    }
}