com.qwazr.database.TableSingleton Maven / Gradle / Ivy
/*
* Copyright 2015-2018 Emmanuel Keller / QWAZR
*
* 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.qwazr.database;
import com.qwazr.database.store.Tables;
import com.qwazr.utils.concurrent.ExecutorSingleton;
import java.io.Closeable;
import java.io.IOException;
import java.nio.file.Path;
import java.util.concurrent.ExecutorService;
public class TableSingleton extends ExecutorSingleton implements Closeable {
private final Path parentDirectory;
private volatile Path tablesDirectory;
private volatile TableManager tableManager;
public TableSingleton(final Path parentDirectory, final ExecutorService executorService) {
super(executorService);
this.parentDirectory = parentDirectory;
}
public Path getTablesDirectory() throws IOException {
if (tablesDirectory == null) {
synchronized (TableManager.class) {
if (tablesDirectory == null)
tablesDirectory = TableManager.checkTablesDirectory(parentDirectory);
}
}
return tablesDirectory;
}
public TableManager getTableManager() throws IOException {
if (tableManager == null) {
synchronized (TableManager.class) {
if (tableManager == null)
tableManager = new TableManager(getExecutorService(), getTablesDirectory());
}
}
return tableManager;
}
@Override
public void close() {
Tables.closeAll();
super.close();
}
}