de.akquinet.jbosscc.guttenbase.export.plain.PlainGzipExporter Maven / Gradle / Ivy

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package de.akquinet.jbosscc.guttenbase.export.plain;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.sql.SQLException;
import java.util.Map;
import java.util.zip.GZIPOutputStream;

import de.akquinet.jbosscc.guttenbase.export.ExportDumpConnectorInfo;
import de.akquinet.jbosscc.guttenbase.export.ExportDumpExtraInformation;
import de.akquinet.jbosscc.guttenbase.export.ExportTableHeader;
import de.akquinet.jbosscc.guttenbase.export.Exporter;
import de.akquinet.jbosscc.guttenbase.meta.DatabaseMetaData;
import de.akquinet.jbosscc.guttenbase.meta.TableMetaData;
import de.akquinet.jbosscc.guttenbase.repository.ConnectorRepository;

/**
 * Export schema information and data into gzipped {@link ObjectOutputStream} file with serialized data.
 * 
 * 
 * © 2012-2020 akquinet tech@spree
 * 
 * 
 * @author M. Dahm
 */
public class PlainGzipExporter implements Exporter {
	private ObjectOutputStream _objectOutputStream;
	private ConnectorRepository _connectorRepository;
	private String _connectorId;
	private ExportDumpConnectorInfo _exportDumpConnectionInfo;

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void initializeExport(final ConnectorRepository connectorRepository, final String connectorId,
			final ExportDumpConnectorInfo exportDumpConnectionInfo) throws Exception {
		assert exportDumpConnectionInfo != null : "exportDumpConnectionInfo != null";
		assert connectorId != null : "connectorId != null";
		assert connectorRepository != null : "connectorRepository != null";

		_connectorRepository = connectorRepository;
		_connectorId = connectorId;
		_exportDumpConnectionInfo = exportDumpConnectionInfo;

		openOutputStream(exportDumpConnectionInfo);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void finishExport() throws Exception {
		writeExtraInformation();
		_objectOutputStream.close();
		_objectOutputStream = null;
	}

	@Override
	public void writeTableHeader(final ExportTableHeader exportTableHeader) throws IOException {
		_objectOutputStream.writeObject(exportTableHeader);
	}

	@Override
	public void writeDatabaseMetaData(final DatabaseMetaData databaseMetaData) throws IOException {
		_objectOutputStream.writeObject(databaseMetaData);
	}

	@Override
	public void initializeWriteTableData(final TableMetaData table) {
	}

	@Override
	public void finalizeWriteTableData(final TableMetaData table) {
	}

	@Override
	public void initializeWriteRowData(final TableMetaData table) {
	}

	@Override
	public void finalizeWriteRowData(final TableMetaData table) {
	}

	/**
	 * Resets the output stream which reduces memory foot print drastically. See {@link ObjectOutputStream#reset()} for details.
	 */
	@Override
	public void flush() throws IOException {
		_objectOutputStream.reset();
		_objectOutputStream.flush();
	}

	@Override
	public void writeObject(final Object obj) throws IOException {
		_objectOutputStream.writeObject(obj);
	}

	private void writeExtraInformation() throws SQLException, IOException {
		final ExportDumpExtraInformation exportDumpExtraInformation = _connectorRepository.getConnectorHint(_connectorId,
				ExportDumpExtraInformation.class).getValue();

		final Map extraInformation = exportDumpExtraInformation.getExtraInformation(_connectorRepository, _connectorId,
				_exportDumpConnectionInfo);

		writeObject(extraInformation);
	}

	private void openOutputStream(final ExportDumpConnectorInfo exportDumpConnectionInfo) throws IOException {
		final File file = new File(exportDumpConnectionInfo.getPath());
		final FileOutputStream fileOutputStream = new FileOutputStream(file);
		final GZIPOutputStream gzipOutputStream = new GZIPOutputStream(fileOutputStream);
		_objectOutputStream = new ObjectOutputStream(gzipOutputStream);
	}
}