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/**
* Copyright (C) 2000-2020 Atomikos
*
* LICENSE CONDITIONS
*
* See http://www.atomikos.com/Main/WhichLicenseApplies for details.
*/
package com.atomikos.icatch.imp;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Hashtable;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.Stack;
import com.atomikos.finitestates.FSMEnterEvent;
import com.atomikos.finitestates.FSMEnterListener;
import com.atomikos.icatch.CompositeCoordinator;
import com.atomikos.icatch.CompositeTransaction;
import com.atomikos.icatch.Participant;
import com.atomikos.icatch.Propagation;
import com.atomikos.icatch.RecoveryCoordinator;
import com.atomikos.icatch.RecoveryService;
import com.atomikos.icatch.SubTxAwareParticipant;
import com.atomikos.icatch.SysException;
import com.atomikos.icatch.TransactionService;
import com.atomikos.icatch.TransactionServicePlugin;
import com.atomikos.icatch.config.Configuration;
import com.atomikos.icatch.provider.TransactionServiceProvider;
import com.atomikos.logging.Logger;
import com.atomikos.logging.LoggerFactory;
import com.atomikos.persistence.StateRecoveryManager;
import com.atomikos.recovery.LogException;
import com.atomikos.recovery.RecoveryLog;
import com.atomikos.recovery.TxState;
import com.atomikos.recovery.fs.RecoveryLogImp;
import com.atomikos.thread.TaskManager;
import com.atomikos.util.UniqueIdMgr;
/**
* General implementation of Transaction Service.
*/
public class TransactionServiceImp implements TransactionServiceProvider,
FSMEnterListener, SubTxAwareParticipant, RecoveryService
{
private static final Logger LOGGER = LoggerFactory.createLogger(TransactionServiceImp.class);
private static final int NUMLATCHES = 97;
private static final Object shutdownSynchronizer = new Object();
private long maxTimeout_;
private Object[] rootLatches_ = null;
private Hashtable tidToTransactionMap_ = null;
private Map recreatedCoordinatorsByRootId = new HashMap<>();
private Map allCoordinatorsByCoordinatorId = new HashMap<>();
private boolean shutdownInProgress_ = false;
private UniqueIdMgr tidmgr_ = null;
private StateRecoveryManager recoverymanager_ = null;
private boolean initialized_ = false;
private Set tsListeners = new HashSet<>();
private int maxNumberOfActiveTransactions_;
private String tmUniqueName_;
private boolean single_threaded_2pc_;
private RecoveryLog recoveryLog;
private RecoveryDomainService recoveryDomainService;
/**
* Create a new instance, with orphan checking set.
*
* @param name
* The unique name of this TM.
* @param recoverymanager
* The recovery manager to use.
* @param tidmgr
* The String manager to use.
* @param maxtimeout
* The max timeout for new or imported txs.
*
* @param maxActives
* The max number of active txs, or negative if unlimited.
* even for creation requests that ask for checks. This
* mode may be needed for being compatible with certain
* configurations that do not support orphan detection.
* @param single_threaded_2pc
* Whether 2PC commit should happen in the same thread that started the tx.
* @param recoveryLog2
*
*/
public TransactionServiceImp ( String name ,
StateRecoveryManager recoverymanager , UniqueIdMgr tidmgr ,
long maxtimeout ,
int maxActives , boolean single_threaded_2pc, RecoveryLog recoveryLog )
{
maxNumberOfActiveTransactions_ = maxActives;
initialized_ = false;
recoverymanager_ = recoverymanager;
tidmgr_ = tidmgr;
tidToTransactionMap_ = new Hashtable();
rootLatches_ = new Object[NUMLATCHES];
for (int i = 0; i < NUMLATCHES; i++) {
rootLatches_[i] = new Object();
}
maxTimeout_ = maxtimeout;
tmUniqueName_ = name;
single_threaded_2pc_ = single_threaded_2pc;
this.recoveryLog = recoveryLog;
this.recoveryDomainService = new RecoveryDomainService(recoveryLog);
}
/**
* Get an object to lock for the given root. To increase concurrency and
* still provide atomic operations within the scope of one root.
*
* @return Object The object to lock for the given root.
*/
private Object getLatch ( String root )
{
return rootLatches_[Math.abs ( root.toString().hashCode() % NUMLATCHES )];
}
/**
* Set the map to ct for this tid.
*
* @param tid
* The tx id to map.
* @param ct
* The tx to map to.
* @exception IllegalStateException
* If the tid is already mapped.
*/
private void setTidToTx ( String tid , CompositeTransaction ct )
throws IllegalStateException
{
synchronized ( tidToTransactionMap_ ) {
if ( tidToTransactionMap_.containsKey ( tid.intern () ) )
throw new IllegalStateException ( "Already mapped: " + tid );
tidToTransactionMap_.put ( tid.intern (), ct );
ct.addSubTxAwareParticipant(this); // for GC purposes
}
}
/**
* Removes the coordinator from the root map.
*
* @param coord
* The coordinator to remove.
*/
private void removeCoordinator ( CompositeCoordinator coord )
{
synchronized ( shutdownSynchronizer ) {
synchronized ( getLatch ( coord.getRootId()) ) {
recreatedCoordinatorsByRootId.remove (coord.getRootId());
allCoordinatorsByCoordinatorId.remove(coord.getCoordinatorId());
}
// notify any waiting threads for shutdown
if ( allCoordinatorsByCoordinatorId.isEmpty() )
shutdownSynchronizer.notifyAll ();
}
}
/**
* Removes the tx from the map.
*
* Does nothing if not found or if ct null.
*
* @param ct
* The transaction to remove.
*/
private void removeTransaction ( CompositeTransaction ct )
{
if ( ct == null )
return;
tidToTransactionMap_.remove ( ct.getTid ().intern () );
}
/**
* Creation method for composite transactions.
*
* @return CompositeTransaction.
*/
private CompositeTransactionImp createCT ( String tid ,
CoordinatorImp coordinator , Stack lineage , boolean serial )
throws SysException
{
if ( LOGGER.isTraceEnabled() ) LOGGER.logTrace ( "Creating composite transaction: " + tid );
CompositeTransactionImp ct = new CompositeTransactionImp ( this,
lineage, tid, serial, coordinator );
setTidToTx ( ct.getTid (), ct );
coordinator.incLocalSiblingsStarted(); //orphan detection and timeout handling
return ct;
}
/**
* Creation method for composite coordinators.
*
* @param recoveryDomainName The recovery domain of the superior of this coordinator.
*
* @param RecoveryCoordinator
* An existing coordinator for the given root. Null if not a
* subtx, or an adaptor in other cases.
* @param lineage
* The ancestor information.
* @param root
* The root id.
* @param timeout
* The timeout for indoubt states. After this time, indoubts are
* terminated heuristically according to the given strategy.
*
* @return CoordinatorImp.
*/
private CoordinatorImp createCC (String recoveryDomainName, RecoveryCoordinator adaptor ,
String root, long timeout )
{
CoordinatorImp cc = null;
if (maxTimeout_ > 0 && timeout > maxTimeout_ ) {
timeout = maxTimeout_;
//FIXED 20188
LOGGER.logWarning ( "Attempt to create a transaction with a timeout that exceeds maximum - truncating to: " + maxTimeout_ );
}
synchronized ( shutdownSynchronizer ) {
// check if shutting down -> do not allow new coordinator objects
// to be added, so that shutdown will eventually succeed.
if ( shutdownInProgress_ )
throw new IllegalStateException ( "Server is shutting down..." );
String coordinatorId = root;
boolean subTransaction = (adaptor != null);
if (subTransaction) { //not a root
coordinatorId = tidmgr_.get();
}
cc = new CoordinatorImp (recoveryDomainName, coordinatorId, root, adaptor, timeout, single_threaded_2pc_ );
recoverymanager_.register ( cc );
// now, add to root map, since we are sure there are not too many active txs
synchronized ( getLatch ( root) ) {
CoordinatorImp entryForRoot = recreatedCoordinatorsByRootId.get(root);
if (entryForRoot == null) { //cf case 178075
recreatedCoordinatorsByRootId.put(root, cc);
}
allCoordinatorsByCoordinatorId.put(coordinatorId, cc);
}
startlistening ( cc );
}
return cc;
}
/**
* Start listening for terminated states, so coordinator can be removed.
*
* @param coordinator
* The coordinator to listen on.
*
*/
private void startlistening ( CoordinatorImp coordinator )
{
Set forgetStates = new HashSet();
for (TxState txState : TxState.values()) {
if(txState.isFinalStateForOltp()) {
forgetStates.add(txState);
}
}
for (TxState txState : forgetStates) {
coordinator.addFSMEnterListener ( this, txState );
}
// on recovery, the end states might have been reached
// BEFORE listener added -> check and remove if so.
if ( forgetStates.contains ( coordinator.getState () ) )
removeCoordinator ( coordinator );
}
private CoordinatorImp getCoordinatorImpForRoot ( String root )
throws SysException
{
root = root.intern ();
if ( !initialized_ )
throw new IllegalStateException ( "Not initialized" );
CoordinatorImp cc = null;
synchronized ( shutdownSynchronizer ) {
// Synch on shutdownSynchronizer_ first to avoid
// deadlock, even if we don't seem to need it here
synchronized ( getLatch ( root ) ) {
cc = recreatedCoordinatorsByRootId.get(root);
}
}
return cc;
}
public String getName ()
{
return tmUniqueName_;
}
/**
* @see TransactionService
*/
public CompositeCoordinator getCompositeCoordinator ( String root )
throws SysException
{
return getCoordinatorImpForRoot ( root );
}
/**
* @see TransactionService
*/
public void addTSListener ( TransactionServicePlugin listener )
throws IllegalStateException
{
// NOTE: we do NOT synchronize with init,
// because compensators will call this method
// during recovery, and recovery happens inside
// init!
tsListeners.add( listener );
if ( LOGGER.isTraceEnabled() ) LOGGER.logTrace ( "Added TSListener: " + listener );
}
/**
* @see TransactionService
*/
public void removeTSListener ( TransactionServicePlugin listener )
{
tsListeners.remove(listener);
if ( LOGGER.isTraceEnabled() ) LOGGER.logTrace ( "Removed TSListener: " + listener );
}
/**
* @see TransactionService
*/
public synchronized void init ( Properties properties ) throws SysException
{
shutdownInProgress_ = false;
recoveryDomainService.init();;
initialized_ = true;
}
/**
* @see TransactionService
*/
public Participant getParticipant ( String root ) throws SysException
{
return getCoordinatorImpForRoot ( root );
}
/**
* @see FSMEnterListener.
*/
public void entered ( FSMEnterEvent event )
{
CoordinatorImp cc = (CoordinatorImp) event.getSource ();
removeCoordinator(cc);
}
/**
* Called if a tx is ended successfully. In order to remove the tx from the
* mapping.
*
* @see SubTxAwareParticipant
*/
public void committed ( CompositeTransaction tx )
{
removeTransaction ( tx );
}
/**
* Called if a tx is ended with failure. In order to remove tx from mapping.
*
* @see SubTxAwareParticipant
*/
public void rolledback ( CompositeTransaction tx )
{
removeTransaction ( tx );
}
/**
* @see TransactionService
*/
public CompositeTransaction getCompositeTransaction ( String tid )
{
CompositeTransaction ret = null;
synchronized ( tidToTransactionMap_ ) {
ret = (CompositeTransaction) tidToTransactionMap_.get ( tid.intern () );
}
return ret;
}
/**
* Creates a subtransaction for the given parent
*
* @param parent
* @return
*/
@SuppressWarnings("unchecked")
CompositeTransaction createSubTransaction ( CompositeTransaction parent )
{
if (Configuration.getConfigProperties().getAllowSubTransactions()) {
CompositeTransactionImp ret = null;
Stack lineage = (Stack) parent.getLineage ().clone ();
lineage.push ( parent );
String tid = tidmgr_.get ();
CoordinatorImp ccParent = (CoordinatorImp) parent
.getCompositeCoordinator ();
SubTransactionRecoveryCoordinator rc = new SubTransactionRecoveryCoordinator(ccParent.getCoordinatorId(), tmUniqueName_);
// create NEW coordinator for subtx, with most of the parent settings
// but without orphan checks since subtxs have no orphans
CoordinatorImp cc = createCC ( tmUniqueName_, rc, parent.getCompositeCoordinator().getRootId(), parent.getTimeout () );
ret = createCT ( tid, cc, lineage, parent.isSerial () );
ret.noLocalAncestors = false;
return ret;
} else {
throw new SysException("Subtransactions not allowed - set config property com.atomikos.icatch.allow_subtransactions=true to enable");
}
}
/**
* @see TransactionService
*/
public synchronized CompositeTransaction recreateCompositeTransaction (Propagation context) throws SysException {
if ( !initialized_ )
throw new IllegalStateException ( "Not initialized" );
if (!tmUniqueName_.equals(context.getRecoveryDomainName()) && !usesDefaultRecovery()) {
throw new IllegalArgumentException("Cannot import a transaction from a different recovery domain: " +
context.getRecoveryDomainName() + ".\n" +
"Only transactions within the same domain (a.k.a. LogCloud) are allowed!");
}
if ( maxNumberOfActiveTransactions_ >= 0 && tidToTransactionMap_.size () >= maxNumberOfActiveTransactions_ )
throw new IllegalStateException (
"Max number of active transactions reached:" + maxNumberOfActiveTransactions_ );
CoordinatorImp cc = null;
CompositeTransaction ct = null;
try {
String tid = tidmgr_.get ();
boolean serial = context.isSerial ();
CompositeTransaction root = context.getRootTransaction();
CompositeTransaction parent = context.getParentTransaction();
synchronized ( shutdownSynchronizer ) {
synchronized ( getLatch ( root.getTid () ) ) {
cc = getCoordinatorImpForRoot ( root.getTid () );
if ( cc == null ) {
RecoveryCoordinator coord = parent
.getCompositeCoordinator ()
.getRecoveryCoordinator ();
cc = createCC (context.getRecoveryDomainName(), coord, root.getTid (), context.getTimeout () );
}
}
}
ct = createCT ( tid, cc, context.getLineage(), serial );
} catch ( Exception e ) {
throw new SysException ( "Error in recreate.", e );
}
return ct;
}
private boolean usesDefaultRecovery() {
return Configuration.getRecoveryLog() instanceof RecoveryLogImp;
}
/**
* @see TransactionService
*/
public void shutdown ( boolean force ) {
shutdown(force, Long.MAX_VALUE);
}
public void shutdown(long maxWaitTime) {
shutdown(false, maxWaitTime);
}
private void shutdown(boolean force, long maxWaitTime) {
boolean wasShuttingDown = false;
LOGGER.logInfo ( "Entering shutdown (" + force + ", " + maxWaitTime + ")..." );
// following moved out of synch block to avoid deadlock on immediate
// shutdown with interleaving entered notification of a terminating
// coordinator state-handler
if ( !wasShuttingDown && force ) {
// If we were already shutting down, then the FIRST thread
// to enter this method will do the following. Don't do
// it twice.
for (String next : allCoordinatorsByCoordinatorId.keySet()) {
LOGGER.logTrace ( "Stopping thread for coordinatorId "
+ next + "..." );
CoordinatorImp c = allCoordinatorsByCoordinatorId.get(next);
if (c != null) { // null on concurrent termination / removal
c.dispose (); // needed for forced shutdown
}
LOGGER.logTrace ( "Thread stopped." );
}
}
synchronized ( shutdownSynchronizer ) {
LOGGER.logTrace ( "Shutdown acquired lock on waiter." );
wasShuttingDown = shutdownInProgress_;
shutdownInProgress_ = true;
if (!force) {
recoveryDomainService.performRecovery();
recoveryLog.closing(); // allow other node to take over
ConditionalWaiter waiter = new ConditionalWaiter(maxWaitTime);
boolean timeout = waiter.waitWhile(() -> {
boolean allCoordinatorsDone = allCoordinatorsByCoordinatorId.isEmpty();
boolean recoveryDone = !recoveryDomainService.hasMoreToRecover();
boolean waiting = !allCoordinatorsDone || !recoveryDone;
if (waiting) {
LOGGER.logWarning("Shutdown waiting: allCoordinatorsDone=" + allCoordinatorsDone + ", recoveryDone="+recoveryDone);
}
return !allCoordinatorsDone || !recoveryDone;
});
if (usesDefaultRecovery()) {
if (timeout) {
LOGGER.logWarning("Shutdown leaves pending transactions in log - do NOT delete logfiles!");
} else {
LOGGER.logInfo("Shutdown leaves no pending transactions - ok to delete logfiles");
}
}
}
initialized_ = false;
if ( !wasShuttingDown ) {
// If we were already shutting down, then the FIRST thread
// to enter this method will do the following. Don't do
// it twice.
try {
recoverymanager_.close ();
} catch ( LogException le ) {
throw new SysException ( "Error in shutdown: "
+ le.getMessage (), le );
}
recoveryDomainService.stop();
recoveryLog.closed();
}
}
shutdownSystemExecutors();
}
private void shutdownSystemExecutors() {
TaskManager exec = TaskManager.SINGLETON;
if ( exec != null ) {
exec.shutdown();
}
}
public synchronized void finalize () throws Throwable
{
try {
if ( !shutdownInProgress_ && initialized_ ) shutdown ( true );
} catch ( Exception e ) {
LOGGER.logWarning( "Error in GC of TransactionServiceImp" , e );
} finally {
super.finalize ();
}
}
public CompositeTransaction createCompositeTransaction ( long timeout ) throws SysException
{
if ( !initialized_ ) throw new IllegalStateException ( "Not initialized" );
if ( maxNumberOfActiveTransactions_ >= 0 &&
tidToTransactionMap_.size () >= maxNumberOfActiveTransactions_ ) {
throw new IllegalStateException ( "Max number of active transactions reached:" + maxNumberOfActiveTransactions_ );
}
String tid = tidmgr_.get ();
Stack lineage = new Stack();
// create a CC with heuristic preference set to false,
// since it does not really matter anyway (since we are
// creating a root)
CoordinatorImp cc = createCC(tmUniqueName_, null, tid, timeout);
CompositeTransaction ct = createCT ( tid, cc, lineage, false );
return ct;
}
@Override
public RecoveryService getRecoveryService() {
return this;
}
@Override
public RecoveryLog getRecoveryLog() {
return this.recoveryLog;
}
@Override
public void transactionSuspended(CompositeTransaction ct) {
CoordinatorImp cc = (CoordinatorImp) ct.getCompositeCoordinator();
try {
cc.incLocalSiblingsTerminated(); //allow rollback on timeout
} catch (Exception e) {
//ignore: courtesy method
LOGGER.logDebug("Unexpected error trying to suspend transaction - ignoring", e);
}
}
@Override
public void transactionResumed(CompositeTransaction ct) {
CoordinatorImp cc = (CoordinatorImp) ct.getCompositeCoordinator();
try {
cc.incLocalSiblingsStarted(); //prevent rollback on timeout
} catch (Exception e) {
//ignore: courtesy method
LOGGER.logDebug("Unexpected error trying to resume transaction - ignoring", e);
}
}
}
