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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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package org.sirix.access;

import org.sirix.api.NodeReadOnlyTrx;
import org.sirix.api.NodeTrx;
import org.sirix.api.ResourceManager;
import org.sirix.cache.BufferManager;

import org.checkerframework.checker.nullness.qual.NonNull;
import java.nio.file.Path;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import static com.google.common.base.Preconditions.checkNotNull;

public class ResourceStoreImpl>
    implements ResourceStore {

  /**
   * Central repository of all open resource managers.
   */
  private final Map resourceManagers;

  private final PathBasedPool> allResourceManagers;

  private final ResourceManagerFactory resourceManagerFactory;

  public ResourceStoreImpl(final PathBasedPool> allResourceManagers,
                           final ResourceManagerFactory resourceManagerFactory) {

    this.resourceManagers = new ConcurrentHashMap<>();
    this.allResourceManagers = allResourceManagers;
    this.resourceManagerFactory = resourceManagerFactory;
  }

  @Override
  public R openResource(final @NonNull ResourceConfiguration resourceConfig,
                        final @NonNull BufferManager bufferManager,
                        final @NonNull Path resourceFile) {
    return this.resourceManagers.computeIfAbsent(resourceFile, k -> {
      final var resourceManager = this.resourceManagerFactory.create(resourceConfig, bufferManager, resourceFile);
      this.allResourceManagers.putObject(resourceFile, resourceManager);
      return resourceManager;
    });
  }

  @Override
  public boolean hasOpenResourceManager(final Path resourceFile) {
    checkNotNull(resourceFile);
    return resourceManagers.containsKey(resourceFile);
  }

  @Override
  public R getOpenResourceManager(final Path resourceFile) {
    checkNotNull(resourceFile);
    return resourceManagers.get(resourceFile);
  }

  @Override
  public void close() {
    resourceManagers.forEach((resourceName, resourceMgr) -> resourceMgr.close());
    resourceManagers.clear();
  }

  @Override
  public boolean closeResourceManager(final Path resourceFile) {
    final R manager = resourceManagers.remove(resourceFile);
    this.allResourceManagers.removeObject(resourceFile, manager);
    return manager != null;
  }
}