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package org.mapdb;
import java.io.*;
import java.util.Arrays;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.mapdb.Volume.MappedFileVol;
public class BrokenDBTest {
File index;
File data;
File log;
@Before
public void before() throws IOException {
index = UtilsTest.tempDbFile();
data = new File(index.getPath() + StoreDirect.DATA_FILE_EXT);
log = new File(index.getPath() + StoreWAL.TRANS_LOG_FILE_EXT);
}
/**
* Verify that DB files are properly closed when opening the database fails, allowing an
* application to recover by purging the database and starting over.
*
* @throws FileNotFoundException
* @throws IOException
*/
@Test
public void canDeleteDBOnBrokenIndex() throws FileNotFoundException, IOException {
for (final File f : Arrays.asList(index, data, log)) {
final FileOutputStream fos = new FileOutputStream(f);
fos.write("Some Junk".getBytes());
fos.close();
}
try {
DBMaker.newFileDB(index).make();
Assert.fail("Expected exception not thrown");
} catch (final IOError e) {
// will fail!
Assert.assertTrue("Wrong message", e.getMessage().contains("storage has invalid header"));
}
index.delete();
data.delete();
log.delete();
// assert that we can delete the db files
Assert.assertFalse("Can't delete index", index.exists());
Assert.assertFalse("Can't delete data", data.exists());
Assert.assertFalse("Can't delete log", log.exists());
}
/**
* Verify that DB files are properly closed when opening the database fails, allowing an
* application to recover by purging the database and starting over.
*
* @throws FileNotFoundException
* @throws IOException
*/
@Test
public void canDeleteDBOnBrokenLog() throws IOException {
// init empty, but valid DB
DBMaker.newFileDB(index).make().close();
// trash the log
MappedFileVol logVol = new Volume.MappedFileVol(log, false, 0, false);
logVol.ensureAvailable(32);
logVol.putInt(0, StoreWAL.HEADER);
logVol.putUnsignedShort(4, StoreWAL.STORE_VERSION);
logVol.putLong(8, StoreWAL.LOG_SEAL);
logVol.putLong(16, 123456789L);
logVol.sync();
logVol.close();
try {
DBMaker.newFileDB(index).make();
Assert.fail("Expected exception not thrown");
} catch (final Error e) {
// will fail!
Assert.assertTrue("Wrong message", e.getMessage().contains("unknown trans log instruction"));
}
index.delete();
data.delete();
log.delete();
// assert that we can delete the db files
Assert.assertFalse("Can't delete index", index.exists());
Assert.assertFalse("Can't delete data", data.exists());
Assert.assertFalse("Can't delete log", log.exists());
}
@After
public void after() throws IOException {
if (index != null)
index.deleteOnExit();
if (data != null)
data.deleteOnExit();
if (log != null)
log.deleteOnExit();
}
public static class SomeDataObject implements Serializable {
private static final long serialVersionUID = 1L;
public int someField = 42;
}
/**
* Verify that DB files are properly closed when opening the database fails, allowing an
* application to recover by purging the database and starting over.
*
* @throws FileNotFoundException
* @throws IOException
*
*
*/
@Test
public void canDeleteDBOnBrokenContent() throws IOException {
// init empty, but valid DB
DB db = DBMaker.newFileDB(index).make();
db.getHashMap("foo").put("foo", new SomeDataObject());
db.commit();
db.close();
// Fudge the content so that the data refers to an undefined field in SomeDataObject.
RandomAccessFile dataFile = new RandomAccessFile(data, "rw");
byte grep[] = "someField".getBytes();
int p = 0, read;
while ((read = dataFile.read()) >= 0)
if (((byte) read) == grep[p]) {
if (++p == grep.length) {
dataFile.seek(dataFile.getFilePointer() - grep.length);
dataFile.write("xxxxField".getBytes());
break;
}
} else
p = 0;
dataFile.close();
try {
DBMaker.newFileDB(index).make();
Assert.fail("Expected exception not thrown");
} catch (final RuntimeException e) {
// will fail!
Assert.assertTrue("Wrong message", e.getMessage().contains("Could not set field value"));
}
index.delete();
data.delete();
log.delete();
// assert that we can delete the db files
Assert.assertFalse("Can't delete index", index.exists());
Assert.assertFalse("Can't delete data", data.exists());
Assert.assertFalse("Can't delete log", log.exists());
}
}