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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2002,2010 Oracle. All rights reserved.
*
* $Id: DirtyReadTest.java,v 1.20.2.2 2010/01/04 15:30:42 cwl Exp $
*/
package com.sleepycat.je;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import junit.framework.TestCase;
import com.sleepycat.je.util.StringDbt;
import com.sleepycat.je.util.TestUtils;
/**
* Check that the Database and Cursor classes properly use read-uncommitted
* when specified.
*/
public class DirtyReadTest extends TestCase {
private File envHome;
private Environment env;
public DirtyReadTest() {
envHome = new File(System.getProperty(TestUtils.DEST_DIR));
}
public void setUp()
throws IOException {
TestUtils.removeLogFiles("Setup", envHome, false);
}
public void tearDown()
throws Exception {
TestUtils.removeLogFiles("TearDown", envHome, false);
}
public void testReadUncommitted()
throws Throwable {
Database db = null;
Transaction txnA = null;
Cursor cursor = null;
try {
/* Make an environment, a db, insert a few records */
EnvironmentConfig envConfig = TestUtils.initEnvConfig();
envConfig.setTransactional(true);
envConfig.setAllowCreate(true);
env = new Environment(envHome, envConfig);
/* Now open for real, insert a record */
DatabaseConfig dbConfig = new DatabaseConfig();
dbConfig.setTransactional(true);
dbConfig.setAllowCreate(true);
db = env.openDatabase(null, "foo", dbConfig);
StringDbt key = new StringDbt("key1");
StringDbt data = new StringDbt("data1");
txnA = env.beginTransaction(null, TransactionConfig.DEFAULT);
OperationStatus status = db.put(txnA, key, data);
assertEquals(OperationStatus.SUCCESS, status);
/*
* txnA should have a write lock on this record. Now try
* to read-uncommitted it.
*/
DatabaseEntry foundKey = new DatabaseEntry();
DatabaseEntry foundData = new DatabaseEntry();
/*
* Make sure we get a deadlock exception without read-uncommitted.
*/
try {
db.get(null, key, foundData, LockMode.DEFAULT);
fail("Should deadlock");
} catch (DeadlockException e) {
}
/*
* Specify read-uncommitted as a lock mode.
*/
status = db.get(null, key, foundData, LockMode.READ_UNCOMMITTED);
assertEquals(OperationStatus.SUCCESS, status);
assertTrue(Arrays.equals(data.getData(), foundData.getData()));
status = db.getSearchBoth
(null, key, data, LockMode.READ_UNCOMMITTED);
assertEquals(OperationStatus.SUCCESS, status);
cursor = db.openCursor(null, CursorConfig.DEFAULT);
status = cursor.getFirst(foundKey, foundData,
LockMode.READ_UNCOMMITTED);
assertEquals(OperationStatus.SUCCESS, status);
assertTrue(Arrays.equals(key.getData(), foundKey.getData()));
assertTrue(Arrays.equals(data.getData(), foundData.getData()));
cursor.close();
/*
* Specify read-uncommitted through a read-uncommitted txn.
*/
TransactionConfig txnConfig = new TransactionConfig();
txnConfig.setReadUncommitted(true);
Transaction readUncommittedTxn =
env.beginTransaction(null, txnConfig);
status = db.get
(readUncommittedTxn, key, foundData, LockMode.DEFAULT);
assertEquals(OperationStatus.SUCCESS, status);
assertTrue(Arrays.equals(data.getData(), foundData.getData()));
status = db.getSearchBoth
(readUncommittedTxn, key, data,LockMode.DEFAULT);
assertEquals(OperationStatus.SUCCESS, status);
cursor = db.openCursor(readUncommittedTxn, CursorConfig.DEFAULT);
status = cursor.getFirst(foundKey, foundData, LockMode.DEFAULT);
assertEquals(OperationStatus.SUCCESS, status);
assertTrue(Arrays.equals(key.getData(), foundKey.getData()));
assertTrue(Arrays.equals(data.getData(), foundData.getData()));
cursor.close();
readUncommittedTxn.abort();
/*
* Specify read-uncommitted through a read-uncommitted cursor
*/
CursorConfig cursorConfig = new CursorConfig();
cursorConfig.setReadUncommitted(true);
cursor = db.openCursor(null, cursorConfig);
status = cursor.getFirst(foundKey, foundData, LockMode.DEFAULT);
assertEquals(OperationStatus.SUCCESS, status);
assertTrue(Arrays.equals(key.getData(), foundKey.getData()));
assertTrue(Arrays.equals(data.getData(), foundData.getData()));
/*
* Open through the compatiblity method, should accept dirty
* read (but ignores it)
*/
// Database compatDb = new Database(env);
// compatDb.open(null, null, "foo", DbConstants.DB_BTREE,
// DbConstants.DB_DIRTY_READ, DbConstants.DB_UNKNOWN);
// compatDb.close();
} catch (Throwable t) {
t.printStackTrace();
throw t;
} finally {
if (cursor != null) {
cursor.close();
}
if (txnA != null) {
txnA.abort();
}
if (db != null) {
db.close();
}
env.close();
}
}
}
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