OnDiskTimeSeriesManager.java

/**
 * 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 io.horizondb.db.series;

import java.io.IOException;
import java.nio.file.Path;

import static io.horizondb.io.files.FileUtils.createDirectoriesIfNeeded;

import io.horizondb.db.Configuration;
import io.horizondb.db.HorizonDBFiles;
import io.horizondb.db.btree.BTreeStore;
import io.horizondb.io.files.FileUtils;
import io.horizondb.model.schema.DatabaseDefinition;
import io.horizondb.model.schema.TimeSeriesDefinition;

/**
 * A <code>TimeSeriesManager</code> that store its data on disk.
 */
public final class OnDiskTimeSeriesManager extends AbstractTimeSeriesManager {

    public OnDiskTimeSeriesManager(TimeSeriesPartitionManager partitionManager, Configuration configuration) {
        super(partitionManager, configuration);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected BTreeStore<TimeSeriesId, TimeSeriesDefinition> createBTreeStore(Configuration configuration, 
                                                                              int branchingFactor) 
                                                                              throws IOException {

        createDirectoriesIfNeeded(HorizonDBFiles.getSystemDirectory(configuration));
        
        Path timeSeriesFile = HorizonDBFiles.getTimeSeriesFile(configuration);

        return BTreeStore.newDiskStore(getName(),
                                       timeSeriesFile, 
                                       branchingFactor, 
                                       TimeSeriesId.getParser(), 
                                       TimeSeriesDefinition.getParser());
    }    

    /**
     * {@inheritDoc}
     */
    @Override
    protected void afterCreate(DatabaseDefinition databaseDefinition,
                               TimeSeriesDefinition timeSeriesDefinition) throws IOException {
      
        Path timeSeriesDirectory = HorizonDBFiles.getTimeSeriesDirectory(this.configuration,
                                                                         databaseDefinition,
                                                                         timeSeriesDefinition);

        FileUtils.createDirectoriesIfNeeded(timeSeriesDirectory);
    }
}