@Override
public void init() {
txThreadMap = new ArrayMap<Thread, TransactionImpl>((byte) 5, true, true);
logSwitcherFileName = txLogDir + separator + "active_tx_log";
txLog1FileName = "tm_tx_log.1";
txLog2FileName = "tm_tx_log.2";
try {
if (fileSystem.fileExists(logSwitcherFileName)) {
FileChannel fc = fileSystem.open(logSwitcherFileName, "rw");
byte fileName[] = new byte[256];
ByteBuffer buf = ByteBuffer.wrap(fileName);
fc.read(buf);
fc.close();
String currentTxLog = txLogDir + separator + UTF8.decode(fileName).trim();
if (!fileSystem.fileExists(currentTxLog)) {
throw logAndReturn(
"TM startup failure",
new TransactionFailureException(
"Unable to start TM, " + "active tx log file[" + currentTxLog + "] not found."));
}
txLog = new TxLog(currentTxLog, fileSystem, msgLog);
msgLog.logMessage("TM opening log: " + currentTxLog, true);
} else {
if (fileSystem.fileExists(txLogDir + separator + txLog1FileName)
|| fileSystem.fileExists(txLogDir + separator + txLog2FileName)) {
throw logAndReturn(
"TM startup failure",
new TransactionFailureException(
"Unable to start TM, "
+ "no active tx log file found but found either "
+ txLog1FileName
+ " or "
+ txLog2FileName
+ " file, please set one of them as active or "
+ "remove them."));
}
ByteBuffer buf = ByteBuffer.wrap(txLog1FileName.getBytes("UTF-8"));
FileChannel fc = fileSystem.open(logSwitcherFileName, "rw");
fc.write(buf);
txLog = new TxLog(txLogDir + separator + txLog1FileName, fileSystem, msgLog);
msgLog.logMessage("TM new log: " + txLog1FileName, true);
fc.force(true);
fc.close();
}
tmOk = true;
} catch (IOException e) {
log.log(Level.SEVERE, "Unable to start TM", e);
throw logAndReturn(
"TM startup failure", new TransactionFailureException("Unable to start TM", e));
}
}
public boolean storeFilesUpgradeable(File neoStoreFile) {
File storeDirectory = neoStoreFile.getParentFile();
for (String fileName : fileNamesToExpectedVersions.keySet()) {
String expectedVersion = fileNamesToExpectedVersions.get(fileName);
FileChannel fileChannel = null;
byte[] expectedVersionBytes = UTF8.encode(expectedVersion);
try {
File storeFile = new File(storeDirectory, fileName);
if (!fs.fileExists(storeFile)) {
return false;
}
fileChannel = fs.open(storeFile, "r");
if (fileChannel.size() < expectedVersionBytes.length) {
return false;
}
fileChannel.position(fileChannel.size() - expectedVersionBytes.length);
byte[] foundVersionBytes = new byte[expectedVersionBytes.length];
fileChannel.read(ByteBuffer.wrap(foundVersionBytes));
if (!expectedVersion.equals(UTF8.decode(foundVersionBytes))) {
return false;
}
} catch (IOException e) {
throw new RuntimeException(e);
} finally {
if (fileChannel != null) {
try {
fileChannel.close();
} catch (IOException e) {
// Ignore exception on close
}
}
}
}
return true;
}
private void changeActiveLog(String newFileName) throws IOException {
// change active log
FileChannel fc = fileSystem.open(logSwitcherFileName, "rw");
ByteBuffer buf = ByteBuffer.wrap(UTF8.encode(newFileName));
fc.truncate(0);
fc.write(buf);
fc.force(true);
fc.close();
msgLog.logMessage("Active txlog set to " + newFileName, true);
}
@Test
public void shouldNotReadExcessivelyFromTheFileChannelWhenRotatingLogWithNoOpenTransactions()
throws Exception {
// given
XaTransactionFactory xaTf = mock(XaTransactionFactory.class);
when(xaTf.getAndSetNewVersion()).thenAnswer(new TxVersion(TxVersion.UPDATE_AND_GET));
when(xaTf.getCurrentVersion()).thenAnswer(new TxVersion(TxVersion.GET));
// spy on the file system abstraction so that we can spy on the file channel for the logical log
FileSystemAbstraction fs = spy(ephemeralFs.get());
File dir = TargetDirectory.forTest(fs, XaLogicalLogTest.class).directory("log", true);
// -- when opening the logical log, spy on the file channel we return and count invocations to
// channel.read(*)
when(fs.open(new File(dir, "logical.log.1"), "rw"))
.thenAnswer(
new Answer<FileChannel>() {
@Override
public FileChannel answer(InvocationOnMock invocation) throws Throwable {
FileChannel channel = (FileChannel) invocation.callRealMethod();
return mock(
channel.getClass(),
withSettings()
.spiedInstance(channel)
.name("channel")
.defaultAnswer(CALLS_REAL_METHODS)
.invocationListeners(
new InvocationListener() {
@Override
public void reportInvocation(
MethodInvocationReport methodInvocationReport) {
if (methodInvocationReport
.getInvocation()
.toString()
.startsWith("channel.read(")) {
reads++;
}
}
}));
}
});
XaLogicalLog xaLogicalLog =
new XaLogicalLog(
new File(dir, "logical.log"),
mock(XaResourceManager.class),
mock(XaCommandFactory.class),
xaTf,
new DefaultLogBufferFactory(),
fs,
new SingleLoggingService(StringLogger.wrap(output.writer())),
LogPruneStrategies.NO_PRUNING,
mock(TransactionStateFactory.class),
25 * 1024 * 1024);
xaLogicalLog.open();
// -- set the log up with 10 transactions (with no commands, just start and commit)
for (int txId = 1; txId <= 10; txId++) {
int identifier =
xaLogicalLog.start(new XidImpl(XidImpl.getNewGlobalId(), RESOURCE_ID), -1, 0);
xaLogicalLog.writeStartEntry(identifier);
xaLogicalLog.commitOnePhase(identifier, txId, ForceMode.forced);
xaLogicalLog.done(identifier);
}
// when
xaLogicalLog.rotate();
// then
assertThat(
"should not read excessively from the logical log file channel", reads, lessThan(10));
}
