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diff --git a/bundles/org.simantics.acorn/src/org/simantics/acorn/internal/AcornDatabase.java b/bundles/org.simantics.acorn/src/org/simantics/acorn/internal/AcornDatabase.java
new file mode 100644
index 000000000..63c73dd63
--- /dev/null
+++ b/bundles/org.simantics.acorn/src/org/simantics/acorn/internal/AcornDatabase.java
@@ -0,0 +1,229 @@
+package org.simantics.acorn.internal;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.DirectoryStream;
+import java.nio.file.FileVisitOption;
+import java.nio.file.FileVisitResult;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.SimpleFileVisitor;
+import java.nio.file.attribute.BasicFileAttributes;
+import java.util.EnumSet;
+import java.util.Properties;
+
+import org.simantics.acorn.GraphClientImpl2;
+import org.simantics.db.Database;
+import org.simantics.db.DatabaseUserAgent;
+import org.simantics.db.ServiceLocator;
+import org.simantics.db.common.utils.Logger;
+import org.simantics.db.server.ProCoreException;
+
+/**
+ * @author Tuukka Lehtonen
+ */
+public class AcornDatabase implements Database {
+
+    private final Path folder;
+
+    private DatabaseUserAgent userAgent;
+
+    public AcornDatabase(Path folder) {
+        this.folder = folder;
+    }
+
+    @Override
+    public DatabaseUserAgent getUserAgent() {
+        return userAgent;
+    }
+
+    @Override
+    public void setUserAgent(DatabaseUserAgent dbUserAgent) {
+        userAgent = dbUserAgent;
+    }
+
+    @Override
+    public Status getStatus() {
+        return Status.Local;
+    }
+
+    @Override
+    public File getFolder() {
+        return folder.toFile();
+    }
+
+    @Override
+    public boolean isFolderOk() {
+        return isFolderOk(folder.toFile());
+    }
+
+    @Override
+    public boolean isFolderOk(File aFolder) {
+        if (!aFolder.isDirectory())
+            return false;
+        return true;
+    }
+
+    @Override
+    public boolean isFolderEmpty() {
+        return isFolderEmpty(folder.toFile());
+    }
+
+    @Override
+    public boolean isFolderEmpty(File aFolder) {
+        Path path = aFolder.toPath();
+        if (!Files.isDirectory(path))
+            return false;
+        try (DirectoryStream<Path> folderStream = Files.newDirectoryStream(path)) {
+            return !folderStream.iterator().hasNext();
+        } catch (IOException e) {
+            Logger.defaultLogError("Failed to open folder stream. folder=" + path, e);
+            return false;
+        }
+    }
+
+    @Override
+    public void initFolder(Properties properties) throws ProCoreException {
+        try {
+            Files.createDirectories(folder);
+        } catch (IOException e) {
+            throw new ProCoreException(e);
+        }
+    }
+
+    @Override
+    public void deleteFiles() throws ProCoreException {
+        // TODO: somehow check that the acorn client is not active.
+        deleteTree(folder);
+    }
+
+    @Override
+    public void start() throws ProCoreException {
+    }
+
+    @Override
+    public boolean isRunning() throws ProCoreException {
+        return true;
+    }
+
+    @Override
+    public boolean tryToStop() throws ProCoreException {
+        return true;
+//        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void connect() throws ProCoreException {
+    }
+
+    @Override
+    public boolean isConnected() throws ProCoreException {
+        return true;
+    }
+
+    @Override
+    public String execute(String command) throws ProCoreException {
+        throw new UnsupportedOperationException("execute(" + command + ")");
+    }
+
+    @Override
+    public void disconnect() throws ProCoreException {
+    }
+
+    @Override
+    public void clone(File to, int revision, boolean saveHistory) throws ProCoreException {
+        // TODO: implement
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public Path createFromChangeSets(int revision) throws ProCoreException {
+        // TODO: implement
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void deleteGuard() throws ProCoreException {
+        // TODO: implement
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public Path dumpChangeSets() throws ProCoreException {
+        // TODO: implement
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void purgeDatabase() throws ProCoreException {
+        // TODO: implement
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public long serverGetTailChangeSetId() throws ProCoreException {
+        // "We have it all"
+        // But after purging we don't so beware.
+        // TODO: beware for purge
+        return 1;
+    }
+
+    @Override
+    public Session newSession(ServiceLocator locator) throws ProCoreException {
+        try {
+            return new GraphClientImpl2(this, folder, locator);
+        } catch (IOException e) {
+            throw new ProCoreException(e);
+        }
+    }
+
+    @Override
+    public Journal getJournal() throws ProCoreException {
+        // TODO: implement
+        throw new UnsupportedOperationException();
+    }
+
+    private static void deleteTree(Path path) throws ProCoreException {
+        if (!Files.exists(path))
+            return;
+
+        class Visitor extends SimpleFileVisitor<Path> {
+            @Override
+            public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
+                try {
+                    Files.delete(file);
+                } catch (IOException ioe) {
+                    ioe.printStackTrace();
+                    throw ioe;
+                }
+                return FileVisitResult.CONTINUE;
+            }
+            @Override
+            public FileVisitResult postVisitDirectory(Path dir, IOException e) throws IOException {
+                if (e == null) {
+                    try {
+                        Files.delete(dir);
+                    } catch (IOException ioe) {
+                        ioe.printStackTrace();
+                        throw ioe;
+                    }
+                    return FileVisitResult.CONTINUE;
+                }
+                throw e;
+            }
+        }
+        try {
+            Visitor v = new Visitor();
+            EnumSet<FileVisitOption> opts = EnumSet.noneOf(FileVisitOption.class);
+            Files.walkFileTree(path, opts, Integer.MAX_VALUE, v);
+        } catch (IOException e) {
+            throw new ProCoreException("Could not delete " + path, e);
+        }
+    }
+
+	@Override
+	public String getCompression() {
+		return "LZ4";
+	}
+
+}