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SirixDB is a hybrid on-disk and in-memory document oriented, versioned database system. It has a lightweight buffer manager, stores everything in a huge persistent and durable tree and allows efficient reconstruction of every revision. Furthermore, SirixDB implements change tracking, diffing and supports time travel queries.

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/*
 * Copyright (c) 2011, University of Konstanz, Distributed Systems Group All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met: * Redistributions of source code must retain the
 * above copyright notice, this list of conditions and the following disclaimer. * Redistributions
 * in binary form must reproduce the above copyright notice, this list of conditions and the
 * following disclaimer in the documentation and/or other materials provided with the distribution.
 * * Neither the name of the University of Konstanz nor the names of its contributors may be used to
 * endorse or promote products derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL  BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package io.sirix.api;

import io.sirix.access.DatabaseConfiguration;
import io.sirix.access.ResourceConfiguration;
import org.checkerframework.checker.index.qual.NonNegative;
import io.sirix.exception.SirixException;
import io.sirix.exception.SirixIOException;

import java.nio.file.Path;
import java.util.List;

/**
 * 
 * This interface describes database instances handled by Sirix. A database is a persistent place
 * where all data is stored. {@link ResourceSession}s are used to access the data in individual
 * resources.
 * 
 *
 * 
 * Furthermore, databases are created by {@link DatabaseConfiguration}s. After creation, the settings
 * of a database cannot be changed.
 * 
 *
 * @author Sebastian Graf, University of Konstanz
 * @author Johannes Lichtenberger
 */
public interface Database>
    extends AutoCloseable {
  /**
   * Determines if the database is open.
   *
   * @return {@code true}, if it's open, {@code false} otherwise
   */
  boolean isOpen();

  /**
   * Creation of a resource. Since databases can consist out of several resources, those can be
   * created within this method. This includes the creation of a suitable folder structure as well as
   * the serialization of the configuration of this resource.
   *
   * @param config the config of the resource
   * @return {@code true} if successful, {@code false} otherwise
   * @throws SirixIOException if anything happens while creating the resource
   */
  boolean createResource(ResourceConfiguration config);

  /**
   * Is the resource within this database existing?
   *
   * @param resourceName resource to be checked
   * @return {@code true}, if existing, {@code false} otherwise
   */
  boolean existsResource(String resourceName);

  /**
   * List all resources within this database.
   *
   * @return all resources
   */
  List listResources();

  /**
   * Open a resource session to work with a resource stored in this database.
   *
   * @param resourceName the resource to work on
   * @return the resource manager
   * @throws SirixException if can't open resource manager
   */
  T beginResourceSession(String resourceName);

  /**
   * Truncating a resource. This includes the removal of all data stored within this resource.
   *
   * @param resourceName resource name
   * @return Database updated database
   */
  Database removeResource(String resourceName);

  /**
   * Closing the database for further access.
   *
   * @throws SirixException if anything happens within sirix.
   */
  @Override
  void close();

  /**
   * Get the {@link DatabaseConfiguration} associated with this database.
   *
   * @return {@link DatabaseConfiguration} reference associated with this database
   */
  DatabaseConfiguration getDatabaseConfig();

  /**
   * Begin a database wide transaction.
   *
   * @return the started transaction
   */
  Transaction beginTransaction();

  /**
   * Get the resource name associated with the given ID.
   *
   * @param id unique ID of resource
   * @return resource name
   * @throws IllegalArgumentException if {@code pID} is negative
   */
  String getResourceName(@NonNegative long id);

  /**
   * Get the resource-ID associated with the given resource name.
   *
   * @param name name of resource
   * @return ID of resource with the given name
   * @throws NullPointerException if {@code pName} is {@code null}
   */
  long getResourceID(String name);

  /**
   * Get the database name.
   *
   * @return the database name
   */
  String getName();
}