org.graylog2.indexer.rotation.strategies.AbstractRotationStrategy Maven / Gradle / Ivy

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/**
 * This file is part of Graylog.
 *
 * Graylog is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Graylog is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Graylog.  If not, see .
 */

package org.graylog2.indexer.rotation.strategies;

import org.graylog2.indexer.Deflector;
import org.graylog2.indexer.NoTargetIndexException;
import org.graylog2.plugin.indexer.rotation.RotationStrategy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.Nullable;

public abstract class AbstractRotationStrategy implements RotationStrategy {
    private static final Logger LOG = LoggerFactory.getLogger(AbstractRotationStrategy.class);

    public interface Result {
        String getDescription();
        boolean shouldRotate();
    }

    private final Deflector deflector;

    public AbstractRotationStrategy(Deflector deflector) {
        this.deflector = deflector;
    }

    @Nullable
    protected abstract Result shouldRotate(String indexName);

    @Override
    public void rotate() {
        final String indexName;
        try {
            indexName = deflector.getNewestTargetName();
        } catch (NoTargetIndexException e) {
            LOG.error("Could not find current deflector target. Aborting.", e);
            return;
        }

        final Result rotate = shouldRotate(indexName);
        if (rotate == null) {
            LOG.error("Cannot perform rotation at this moment.");
            return;
        }
        LOG.debug("Rotation strategy result: {}", rotate.getDescription());
        if (rotate.shouldRotate()) {
            LOG.info("Deflector index <{}> should be rotated, Pointing deflector to new index now!", indexName);
            deflector.cycle();
        } else {
            LOG.debug("Deflector index <{}> should not be rotated. Not doing anything.", indexName);
        }
    }
}