com.hazelcast.partition.impl.PromoteFromBackupOperation Maven / Gradle / Ivy

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Core Hazelcast Module
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/*
 * Copyright (c) 2008-2013, Hazelcast, Inc. All Rights Reserved.
 *
 * Licensed 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 com.hazelcast.partition.impl;

import com.hazelcast.logging.ILogger;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.partition.MigrationCycleOperation;
import com.hazelcast.partition.MigrationEndpoint;
import com.hazelcast.spi.AbstractOperation;
import com.hazelcast.spi.MigrationAwareService;
import com.hazelcast.spi.PartitionAwareOperation;
import com.hazelcast.spi.PartitionMigrationEvent;
import com.hazelcast.spi.impl.NodeEngineImpl;
import java.io.IOException;

// runs locally...
final class PromoteFromBackupOperation extends AbstractOperation
        implements PartitionAwareOperation, MigrationCycleOperation {

    @Override
    public void run() throws Exception {
        logPromotingPartition();
        try {
            PartitionMigrationEvent event = createPartitionMigrationEvent();
            sendToAllMigrationAwareServices(event);
        } finally {
            clearPartitionMigratingFlag();
        }
    }

    private void clearPartitionMigratingFlag() {
        InternalPartitionServiceImpl service = getService();
        InternalPartitionImpl partition = service.getPartition(getPartitionId());
        partition.setMigrating(false);
    }

    private void sendToAllMigrationAwareServices(PartitionMigrationEvent event) {
        NodeEngineImpl nodeEngine = (NodeEngineImpl) getNodeEngine();
        for (MigrationAwareService service : nodeEngine.getServices(MigrationAwareService.class)) {
            try {
                service.beforeMigration(event);
                service.commitMigration(event);
            } catch (Throwable e) {
                logMigrationError(e);
            }
        }
    }

    private PartitionMigrationEvent createPartitionMigrationEvent() {
        int partitionId = getPartitionId();
        return new PartitionMigrationEvent(MigrationEndpoint.DESTINATION, partitionId);
    }

    private void logMigrationError(Throwable e) {
        ILogger logger = getLogger();
        logger.warning("While promoting partition " + getPartitionId(), e);
    }

    private void logPromotingPartition() {
        ILogger logger = getLogger();
        if (logger.isFinestEnabled()) {
            logger.finest("Promoting partition " + getPartitionId());
        }
    }

    @Override
    public boolean returnsResponse() {
        return false;
    }

    @Override
    public boolean validatesTarget() {
        return false;
    }

    @Override
    protected void readInternal(ObjectDataInput in) throws IOException {
        throw new UnsupportedOperationException();
    }

    @Override
    protected void writeInternal(ObjectDataOutput out) throws IOException {
        throw new UnsupportedOperationException();
    }
}