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/*
* Copyright 2004-2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
//----------------------------------------------------------------------------
//
// Module: RecoveryManager.java
//
// Description: Process transaction management.
//
// Product: com.sun.jts.CosTransactions
//
// Author: Simon Holdsworth
//
// Date: March, 1997
//
// Copyright (c): 1995-1997 IBM Corp.
//
// The source code for this program is not published or otherwise divested
// of its trade secrets, irrespective of what has been deposited with the
// U.S. Copyright Office.
//
// This software contains confidential and proprietary information of
// IBM Corp.
//----------------------------------------------------------------------------
package com.sun.jts.CosTransactions;
import java.util.*;
import java.io.*;
import org.omg.CORBA.*;
import org.omg.CosTransactions.*;
import com.sun.jts.jtsxa.*;
import javax.transaction.xa.*;
import com.sun.jts.jta.TransactionManagerImpl;
import com.sun.jts.trace.*;
import java.util.logging.Logger;
import java.util.logging.Level;
import com.sun.logging.LogDomains;
import com.sun.jts.utils.LogFormatter;
import com.sun.enterprise.autotxrecovery.TransactionRecovery;
/**
* This class manages information required for recovery, and also general
* state regarding transactions in a process.
*
* @version 0.01
*
* @author Simon Holdsworth, IBM Corporation
*
* @see
*/
//----------------------------------------------------------------------------
// CHANGE HISTORY
//
// Version By Change Description
// 0.01 SAJH Initial implementation.
//-----------------------------------------------------------------------------
public class RecoveryManager {
/**
* list of XA Resources to be recovered.
*/
private static Enumeration uniqueRMSet = null;
/**
* This attribute indicates whether initialisation has been started.
*/
private static boolean initialised = false;
/**
* This attribute indicates the number of Coordinator objects which require
* resync. This is set to the number of in-doubt transactions recovered
* from the log, then decreased as transactions are resolved.
*/
private static int resyncCoords = 0;
/**
* This attribute records the thread which is used to perform resync during
* restart
*/
private static ResyncThread resyncThread = null;
/**
* This attribute is used to block new requests while there are
* Coordinators which still require resync.
*/
private static volatile EventSemaphore resyncInProgress = new EventSemaphore();
/**
* This attribute is used to block requests against RecoveryCoordinators or
* CoordinatorResources before recovery has completed.
*/
private static volatile EventSemaphore recoveryInProgress = new EventSemaphore();
/**
* This attribute is used by the Recovery Thread to know if the
* xaResource list is ready in case manual recovery is attempted.
*/
private static volatile EventSemaphore uniqueRMSetReady = new EventSemaphore();
private static Hashtable coordsByGlobalTID = new Hashtable();
private static Hashtable coordsByLocalTID = new Hashtable();
/**
* Mapping between transactionIds and threads. This is used to ensure
* there is at most one thread doing work in a transaction.
*/
private static Hashtable transactionIds = new Hashtable();
/**
* Mapping between incompleteTxIds and their commit decisions.
*/
private static Hashtable inCompleteTxMap = new Hashtable();
// This will start TransactionRecovery service as soon as all resources are available.
private static TransactionRecovery txRecovery;
/**
* This is intented to be used as a lock object.
*/
private static java.lang.Object lockObject = new java.lang.Object();
/*
Logger to log transaction messages
*/
static Logger _logger = LogDomains.getLogger(LogDomains.TRANSACTION_LOGGER);
/**
* Initialises the static state of the RecoveryManager class.
*
* @param
*
* @return
*
* @see
*/
static void initialise() {
// If already initialised, return immediately.
if (initialised) {
return;
}
initialised = true;
// Perform recovery/resync if necessary.
if (Configuration.isRecoverable()) {
resyncThread = new ResyncThread();
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager","initialise()",
"Before starting ResyncThread ");
}
resyncThread.start();
} else {
// If the process is non-recoverable, but there is a valid server
// name,then check for a log file and issue a warning message
// if one exists. Also ensure that restart required is set to no.
if (!Configuration.isAppClientContainer()) {
String serverName = Configuration.getServerName();
if (serverName != null && Log.checkFileExists(serverName)) {
_logger.log(Level.INFO,"jts.log_file_transient_server",serverName);
}
}
// Modify the restart requirement in the repository, and
// post the event semaphore as there will be no Coordinators
// requiring resync.
try {
recoveryInProgress.post(); // BUGFIX (Ram Jeyaraman)
resyncComplete(false, false);
} catch (Throwable exc) {}
}
}
/**
* Sets up the local and global identifier to Coordinator mapping as given.
* <p>
* If the global identifier has already got associated information,
* the operation returns false.
* <p>
* The timeout value, if non-zero, is used to establish a time-out for the
* transaction; if the local identifier to Coordinator association
* exists after the time-out period, then the TimeoutManager will
* attempt to roll the transaction back.
*
* @param globalTID The global identifier for the transaction.
* @param localTID The local identifier for the transaction.
* @param coord The Coordinator for the transaction.
* @param timeout The timeout for the transaction.
* @param log The log object for the transaction.
*
* @return Indicates success of the operation.
*
* @see
*/
static boolean addCoordinator(GlobalTID globalTID,
Long localTID, CoordinatorImpl coord, int timeout) {
boolean result = true;
// Attempt to add the global and local indentifier to
// Coordinator associations to the maps.
coordsByGlobalTID.put(globalTID,coord);
coordsByLocalTID.put(localTID,coord);
// Set up the timeout for the transaction. When active, the
// timeout thread will periodically examine the map and abort
// any active transactions on it that have gone beyond their
// allocated time.
if (timeout != 0) {
TimeoutManager.setTimeout(localTID, TimeoutManager.ACTIVE_TIMEOUT,
timeout);
}
return result;
}
/**
* Removes the Coordinator associations for the given identifiers.
* <p>
* If there was no association the operation returns false.
* <p>
* Any timeout that was established for the Coordinator is cancelled,
* and any active thread associations for the transaction are removed
* and the corresponding Control objects destroyed.
*
* @param globalTID The global identifier for the transaction.
* @param localTID The local identifier for the transaction.
* @param aborted The transaction aborted indicator.
*
* @return Indicates success of the operation.
*
* @see
*/
static boolean removeCoordinator(GlobalTID globalTID,
Long localTID, boolean aborted) {
boolean result = false;
// Remove the global identifier to Coordinator mapping if possible.
CoordinatorImpl coord = null;
result = (coordsByGlobalTID.remove(globalTID) != null);
// Remove the InternalTid to Coordinator mapping if possible.
if (result) {
coord = (CoordinatorImpl) coordsByLocalTID.remove(localTID);
result = (coord != null);
}
// If that succeeded, forget the CoordinatorLog object, if the
// transaction is not a subtransaction. The following may return
// FALSE if there are no log records available
// (i.e. non-recoverable OTS).
if (coord != null) {
try {
if (coord.is_top_level_transaction()) {
if (Configuration.isDBLoggingEnabled())
LogDBHelper.getInstance().deleteRecord(localTID.longValue());
else
CoordinatorLog.removeLog(localTID);
}
} catch(SystemException exc) {
result = false;
}
}
// Clear the timeout for the transaction, if any.
// Perform the removal under the timer mutex.
TimeoutManager.setTimeout(localTID, TimeoutManager.CANCEL_TIMEOUT, 0);
// Modify any thread associations there may be for the transaction, to
// indicate that the transaction has ended.
// COMMENT(Ram J) 09/19/2001 This below line is commented out since in
// the J2EE controlled environment, all threads are associated and
// dissociated in an orderly fashion, as well as there is no possibility
// of concurrent threads active in a given transaction.
//CurrentTransaction.endAll(globalTID, aborted);
// If the count of resyncing Coordinators is greater than zero,
// this means we are still in resync. Decrease the count.
if (resyncCoords > 0) {
resyncCoords--;
// If the number of resyncing Coordinators is now zero,
// we may allow new work.
if (resyncCoords == 0) {
try {
resyncComplete(true, true);
} catch (Throwable exc) {}
}
}
return result;
}
/**
* Returns a reference to the Coordinator object that corresponds to the
* global identifier passed as a parameter.
*
* @param globalTID The global identifier for the transaction.
*
* @return The Coordinator for the transaction.
*
* @see
*/
static CoordinatorImpl getCoordinator(GlobalTID globalTID) {
CoordinatorImpl result = (CoordinatorImpl)
coordsByGlobalTID.get(globalTID);
return result;
}
/**
* Read and update the transaction ID map atomically with the current
* thread, if and only if there is no concurrent activity for the
* specified transaction id.
*
* @param tid transaction id.
*
* @return true if there is no concurrent activity and the map has been
* updated.
*/
static boolean readAndUpdateTxMap(GlobalTID tid) {
synchronized (transactionIds) {
Thread thread = (Thread) transactionIds.get(tid);
if (thread != null) { // concurrent activity
return false;
}
// register the thread for the transaction id
transactionIds.put(tid, Thread.currentThread());
return true;
}
}
/**
* Get the value (thread) for the specified transaction id from the
* transaction ID map.
*
* @return the value for the transaction id key from the
* transaction ID map.
*/
static Thread getThreadFromTxMap(GlobalTID tid) {
return (Thread) transactionIds.get(tid);
}
/**
* Remove the specified transaction id from the transaction ID map.
*
* @return the value for the transaction id key from the
* transaction ID map.
*/
static Thread removeFromTxMap(GlobalTID tid) {
return (Thread) transactionIds.remove(tid);
}
/**
* Requests that the RecoveryManager proceed with recovery.
* <p>
* The log is read and a list of TopCoordinators is reconstructed that
* corresponds to those transactions that were in-doubt at the time of the
* previous failure.
* <p>
* The method returns true if any transactions require resync.
*
* @param
*
* @return Indicates that there are Coordinators requiring resync.
*
* @see
*/
static boolean recover() {
boolean result = false;
// Check the log for transactions. If there are any outstanding
// transactions, recover the Coordinator objects and set up the
// OMGtid to Coordinator map.
boolean keypointRequired = false;
Enumeration logRecords = CoordinatorLog.getLogged();
while (logRecords.hasMoreElements()) {
keypointRequired = true;
try {
new TopCoordinator().
reconstruct((CoordinatorLog) logRecords.nextElement());
} catch(Exception exc) {
_logger.log(Level.SEVERE,"jts.recovery_in_doubt_exception",exc);
_logger.log(Level.SEVERE,"jts.recovery_in_doubt",exc.toString());
String msg = LogFormatter.getLocalizedMessage(_logger,
"jts.recovery_in_doubt",
new java.lang.Object[] {exc.toString()});
throw new org.omg.CORBA.INTERNAL(msg);
}
}
// Perform recovery of XA resources.
//recoverXA();
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager","recover()",
"Before invoking proceedWithXARecovery()");
}
proceedWithXARecovery();
// Post the recovery in progress event so that requests
// waiting for recovery to complete may proceed.
recoveryInProgress.post();
// If resync is not needed, then perform after-resync
// tasks immediately.
result = coordsByGlobalTID.size() > 0;
if (!result) {
try {
resyncComplete(false,keypointRequired);
} catch(Throwable exc) {}
}
return result;
}
/**
* Performs resync processing.
* <p>
* The RecoveryManager gets recovery information from each TopCoordinator
* (while holding the transaction lock) and proceeds with resync.
* <p>
* Once resync is complete, a keypoint is taken to indicate that the log
* information is no longer required.
*
* @param
*
* @return
*
* @see
*/
static void resync() {
// If there are any transactions, proceed with resync. The map of
// coordinators by global identifier is created during the
// TopCoordinator reconstruct method when the coordinators are added
// via addCoordinator. We copy the contents to another map as
// Coordinators will remove themselves from the map during resync.
// Now that the Coordinators have been reconstructed, record
// the number of transactions requiring resync,
// and make an event trace point. We must clone the Hashtable
// here so that the Enumeration does not get
// changed when any subsequent transaction is created (this can happen
// when the last Coordinator is removed).
resyncCoords = coordsByGlobalTID.size();
Enumeration resyncList =
((Hashtable) coordsByGlobalTID.clone()).elements();
boolean isRoot[] = new boolean[1];
// Go through and resync each transaction. The transaction lock
// for each transaction is obtained to avoid deadlocks during recovery.
while (resyncList.hasMoreElements()) {
TopCoordinator coord = (TopCoordinator)resyncList.nextElement();
try {
// Before performing recovery, lock the coordinator.
synchronized (coord) {
Status state = coord.recover(isRoot);
if (state == Status.StatusUnknown) {
// If the coordinator can be locked, then perform
// recovery on it. If the outcome is not currently
// known, we do nothing with the transaction,
// as we expect to eventually get an outcome
// from the parent. In this case an in-doubt timeout
// is established for the
// transaction so that it will continue to retry.
// For subordinates, the Coordinator will compl-ete the
// transaction itself as it will have no
// Synchronization objects.
TimeoutManager.setTimeout(
new Long(coord.getLocalTID()),
TimeoutManager.IN_DOUBT_TIMEOUT,
60);
} else if (state == Status.StatusCommitted) {
// For committed or rolled back, proceed with
// completion of the transaction, regardless of
// whether it is the root or a subordinate.
// If the transaction represents a root, it would
// normally wait for the CoordinatorTerm object to
// call before completing the transaction. As there is
// no CoordinatorTerm in recovery, we must do it here.
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager","resync()",
"Before invoking commit on the reconstructed coordinator"+
"GTID is: "+
((TopCoordinator)coord).superInfo.globalTID.toString());
}
try {
coord.commit();
} catch (Throwable exc) {
_logger.log(Level.WARNING,"jts.exception_during_resync",
new java.lang.Object[] {exc.toString(),"commit"});
}
if (isRoot[0]) {
try {
coord.afterCompletion(state);
} catch (Throwable exc) {
_logger.log(Level.WARNING,"jts.exception_during_resync",
new java.lang.Object[] {exc.toString(),
"after_completion"});
}
}
} else {
// By default, roll the transaction back.
try {
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager","resync()",
"Before invoking rollback on the"+
"reconstructed coordinator :"+
"GTID is : "+
((TopCoordinator)coord).superInfo.globalTID.toString());
}
coord.rollback(true);
} catch (Throwable exc) {
_logger.log(Level.WARNING,"jts.resync_failed",
new java.lang.Object [] {exc.toString(),"rollback"});
}
if (isRoot[0]) {
try {
coord.afterCompletion(Status.StatusRolledBack);
} catch (Throwable exc) {
_logger.log(Level.WARNING,"jts.resync_failed",
new java.lang.Object[]
{ exc.toString(), "after_completion"});
}
}
}
}
} catch (Throwable exc) {}
}
// Note that resyncComplete will be called by the
// last TopCoordinator to complete resync (in removeCoordinator)
// so we do not need to do it here.
}
/**
* Called to indicate that resync is complete.
* <p>
* Indicates that all in-doubt Coordinators recovered from the log have
* obtained global outcomes are corresponding transactions are complete.
* <p>
* The parameters indicate whether there were Coordinators
* requiring resync, and whether a keypoint is required.
*
* @param resynced Indicates whether any resync was done.
* @param keypointRequired Indicates whether the log needs keypointing.
*
* @return
*
* @exception LogicErrorException An internal logic error occurred.
*
* @see
*/
static void resyncComplete(boolean resynced,
boolean keypointRequired) throws LogicErrorException {
// Inform JTSXA that resync is complete, and trace the fact
// that resync has completed.
// COMMENT(Ram J) not needed anymore
//JTSXA.resyncComplete();
// Perform a keypoint of the log if required.
if (keypointRequired) {
CoordinatorLog.keypoint();
}
// Post the resync in progress event semaphore.
if (resyncInProgress != null) {
resyncInProgress.post();
resyncInProgress = null;
}
}
/**
* Returns a reference to the Coordinator object that corresponds to the
* local identifier passed as a parameter.
*
* @param localTID The local identifier for the transaction.
*
* @return The Coordinator object.
*
* @see
*/
static CoordinatorImpl getLocalCoordinator(Long localTID) {
CoordinatorImpl result = (CoordinatorImpl)
coordsByLocalTID.get(localTID);
return result;
}
/**
* Determines whether the local transaction identifier represents a valid
* transaction.
*
* @param localTID The local transaction identifier to check.
*
* @return Indicates the local transaction identifier is valid.
*
* @see
*/
static boolean validLocalTID(Long localTID) {
boolean result = coordsByLocalTID.containsKey(localTID);
return result;
}
/**
* Informs the RecoveryManager that the transaction service is being shut
* down.
*
* For immediate shutdown,
*
* For quiesce,
*
* @param immediate Indicates whether to stop immediately.
*
* @return
*
* @see
*/
static void shutdown(boolean immediate) {
/**
if (immediate) {
// If immediate, stop the resync thread if any.
if (resyncThread != null) {
resyncThread.stop();
}
} else {
**/
// Otherwise ensure that resync has completed.
if (resyncInProgress != null) {
try {
resyncInProgress.waitEvent();
if (resyncThread != null) {
resyncThread.join();
}
} catch (InterruptedException exc) {}
}
/**
}
**/
// COMMENT(Ram J) not needed anymore.
//JTSXA.shutdown(immediate);
// If not immediate shutdown, keypoint and close the log.
// Only do this if the process is recoverable!
if (!immediate && Configuration.isRecoverable()) {
CoordinatorLog.keypoint();
CoordinatorLog.finalizeAll();
}
//$Continue with shutdown/quiesce.
}
/**
* @param xid the xid to be stringified.
*
* @return stringified contents of the xid.
*/
private static String stringifyXid(Xid xid) {
int glen = xid.getGlobalTransactionId().length;
int blen = xid.getBranchQualifier().length;
byte[] xidRep = new byte[glen + 1 + blen];
System.arraycopy(xid.getGlobalTransactionId(), 0, xidRep, 0, glen);
xidRep[glen] = (byte) ',';
System.arraycopy(xid.getBranchQualifier(), 0, xidRep, glen + 1, blen);
return new String(xidRep);
}
/**
* Reduce the set of XAResource objects into a unique set such that there
* is at most one XAResource object per RM.
*/
private static Enumeration getUniqueRMSet(Enumeration xaResourceList){
Vector uniqueRMList = new Vector();
while (xaResourceList.hasMoreElements()) {
XAResource xaRes = (XAResource) xaResourceList.nextElement();
int size = uniqueRMList.size();
boolean match = false;
for (int i = 0; i < size; i++) { // compare and eliminate duplicates
XAResource uniqueXaRes = (XAResource) uniqueRMList.elementAt(i);
try {
if (xaRes.isSameRM(uniqueXaRes)) {
match = true;
break;
}
} catch (XAException xe) {}
}
if (!match) {
uniqueRMList.add(xaRes);
}
}
return uniqueRMList.elements();
}
/**
* Recovers the in doubt transactions from the provided list of
* XAResource objects. This method is never called by the recovery
* thread, and its the application threads which wants to pass in
* the XA resources that call this.
*
* @param xaResources enumerated list of XA Resources to be recovered
*
*/
public static void recoverXAResources(Enumeration xaResources) {
/* This method has been newly added - Ram Jeyaraman */
String manualRecovery =
Configuration.getPropertyValue(Configuration.MANUAL_RECOVERY);
// if ManualRecovery property is not set, do not attempt XA recovery.
if (manualRecovery == null ||
!(manualRecovery.equalsIgnoreCase("true"/*#Frozen*/))) {
return;
}
synchronized (lockObject) {
if (uniqueRMSetReady.isPosted() == false) {
RecoveryManager.uniqueRMSet = getUniqueRMSet(xaResources);
uniqueRMSetReady.post();
waitForResync();
return;
} else {
RecoveryManager.waitForResync();
RecoveryManager.uniqueRMSet = getUniqueRMSet(xaResources);
// the following call is meant to induce recovery. But
// currently it will not work as intended, if it is called
// during regular TP processing. Currently, this call deals
// only with XA recovery. There needs to be some support
// from the coordinator to be able to support recovery
// during TP processing.
proceedWithXARecovery();
}
}
}
/**
* This method returns InDoubt Xids for a given XAResource
*/
static Xid[] getInDoubtXids(XAResource xaResource) {
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager", "getInDoubtXids()",
"Before receiving inDoubtXids from xaresource = " +
xaResource);
}
Xid[] inDoubtXids = null;
ArrayList<Xid> inDoubtXidList = null;
int flags;
String recoveryScanFlags = System.getProperty("RECOVERSCANFLAGS");
if (recoveryScanFlags != null && recoveryScanFlags.equals("TMNOFLAGS"))
flags = XAResource.TMSTARTRSCAN;
else
flags = XAResource.TMSTARTRSCAN | XAResource.TMENDRSCAN;
boolean continueLoop = true;
while (continueLoop) {
try {
inDoubtXids = xaResource.recover(flags);
if (inDoubtXids == null || inDoubtXids.length == 0)
break;
if (flags == XAResource.TMSTARTRSCAN || flags == XAResource.TMNOFLAGS) {
flags = XAResource.TMNOFLAGS;
if (inDoubtXidList == null) {
inDoubtXidList = new ArrayList<Xid>();
}
for (int i = 0; i < inDoubtXids.length; i++)
inDoubtXidList.add(inDoubtXids[i]);
}
else {
break;
}
} catch (XAException e) {
_logger.log(Level.WARNING,"jts.xaexception_in_recovery",e);
break;
}
}
if (inDoubtXidList != null)
inDoubtXids = inDoubtXidList.toArray(new Xid[]{});
if(_logger.isLoggable(Level.FINE) && (inDoubtXids != null))
{
String xidList = LogFormatter.convertXidArrayToString(inDoubtXids);
_logger.logp(Level.FINE,"RecoveryManager",
"getInDoubtXid()",
"InDoubtXids returned from xaresource = "+
xaResource + "are: " +xidList);
}
return inDoubtXids;
}
/**
* This method is used to recontruct and register the Resource objects
* corresponding to in-doubt transactions in the RMs. It is assumed
* that the XAResource list has already been provided to the
* Recovery Manager. This method can be called by Recovery Thread as
* well as any other thread driving recovery of XA Resources.
*/
private static void proceedWithXARecovery() {
/* This method has been newly added - Ram Jeyaraman */
Enumeration xaResources = RecoveryManager.uniqueRMSet;
String manualRecovery =
Configuration.getPropertyValue(Configuration.MANUAL_RECOVERY);
// if ManualRecovery property is not set, do not attempt XA recovery.
if (manualRecovery == null ||
!(manualRecovery.equalsIgnoreCase("true"/*#Frozen*/))) {
return;
}
if (Thread.currentThread().getName().equals("JTS Resync Thread"/*#Frozen*/)) {
if (uniqueRMSetReady != null) {
try {
uniqueRMSetReady.waitEvent();
txRecovery.start();
txRecovery.raiseFence();
xaResources = RecoveryManager.uniqueRMSet;
} catch (InterruptedException exc) {
_logger.log(Level.SEVERE,"jts.wait_for_resync_complete_interrupted");
String msg = LogFormatter.getLocalizedMessage(_logger,
"jts.wait_for_resync_complete_interrupted");
throw new org.omg.CORBA.INTERNAL(msg);
}
}
}
// sanity check
if (xaResources == null) {
return;
}
Vector otsResources = new Vector();
// Map uniqueXids = new Hashtable();
Set uniqueXids = new HashSet();
while (xaResources.hasMoreElements()) {
XAResource xaResource = (XAResource) xaResources.nextElement();
// Get the list of XIDs which represent in-doubt transactions
// for the database.
Xid[] inDoubtXids = getInDoubtXids(xaResource);
// uniqueXids.clear();
if (inDoubtXids == null || inDoubtXids.length == 0) {
continue; // No in-doubt xids for this resource.
}
for (int i = 0; i < inDoubtXids.length; i++) {
// check to see if the xid belongs to this server.
String branchQualifier =
new String(inDoubtXids[i].getBranchQualifier());
String serverName = Configuration.getServerName();
if (branchQualifier.startsWith(serverName)) {
// check if the xid is a duplicate. i.e., Xids
// which have same globalId and branchId are
// considered duplicates. Note that the
// branchId format is (serverId, rmId). This is
// to make sure that at most one OTSResource object
// is registered with the coordinator per transaction
// per RM.
String xidStr = stringifyXid(inDoubtXids[i]);
if (!uniqueXids.contains(inDoubtXids[i])) { // unique xid
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager",
"proceedWithXARecovery",
" This xid is UNIQUE " +
inDoubtXids[i]);
}
uniqueXids.add(inDoubtXids[i]);// add to uniqueList
// Create an OTSResource for the in-doubt
// transaction and add it to the list. Each
// OTSResource represents a RM per transaction.
otsResources.addElement(
new OTSResourceImpl(inDoubtXids[i],
xaResource, null
).getCORBAObjReference());
} else {
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager",
"proceedWithXARecovery",
" This xid is NOTUNIQUE " +
inDoubtXids[i]);
}
}
} else {
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager",
"proceedWithXARecovery",
" This xid doesn't belong to me " +
inDoubtXids[i]);
}
}
}
}
// For each OTSResource, determine whether the transaction is known,
// and if so, register it, otherwise roll it back.
for (int i = 0; i < otsResources.size(); i++) {
OTSResource otsResource = (OTSResource) otsResources.elementAt(i);
GlobalTID globalTID = new GlobalTID(otsResource.getGlobalTID());
TopCoordinator coord =
(TopCoordinator) coordsByGlobalTID.get(globalTID);
if (coord == null) {
// Roll the OTSResource back if the transaction is not
// recognised. This happens when the RM has recorded its
// prepare vote, but the JTS has not recorded its prepare vote.
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager","proceedWithXARecovery()",
"Could not recognize OTSResource: "+otsResource +
" with tid: " +
LogFormatter.convertToString(globalTID.realTID.tid)+
";Hence rolling this resource back...");
}
boolean infiniteRetry = true;
int commitRetries = Configuration.getRetries();
if (commitRetries >= 0)
infiniteRetry = false;
int commitRetriesLeft = commitRetries;
boolean exceptionisThrown = true;
while (exceptionisThrown) {
try {
otsResource.rollback();
exceptionisThrown = false;
} catch (Throwable exc) {
if ((exc instanceof COMM_FAILURE) || (exc instanceof TRANSIENT)) {
if (commitRetriesLeft > 0 || infiniteRetry) {
// For TRANSIENT or COMM_FAILURE, wait
// for a while, then retry the commit.
if (!infiniteRetry) {
commitRetriesLeft--;
}
try {
Thread.sleep(Configuration.COMMIT_RETRY_WAIT);
} catch( Throwable e ) {}
}
else {
_logger.log(Level.WARNING,"jts.exception_during_resync",
new java.lang.Object[] {exc.toString(),"OTSResource rollback"});
exceptionisThrown = false;
}
}
else {
_logger.log(Level.WARNING,"jts.exception_during_resync",
new java.lang.Object[] {exc.toString(),"OTSResource rollback"});
exceptionisThrown = false;
}
}
}
} else {
// NOTE: Currently unimplemented. The coordinator needs to
// check if duplicate resources are being registered for the
// same RM for the same xid. Also the coordinator should
// not go away, until all its resources have been sent
// completion notification. The keypointing should not
// be done *as is* in the removeCoordinator() method.
// waitForResync semaphore needs to be flagged when the
// recovery thread goes away.
// Register the OTSResource with the Coordinator.
// It will be called for commit or rollback during resync.
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager",
"proceedWithXARecovery()",
"Recognized OTSResource: " + otsResource +
" with tid: " +
LogFormatter.convertToString(globalTID.realTID.tid) +
";Hence registering this resource with coordinator...");
}
coord.directRegisterResource(otsResource);
}
}
}
static void dbXARecovery() {
Enumeration xaResources = RecoveryManager.uniqueRMSet;
String manualRecovery =
Configuration.getPropertyValue(Configuration.MANUAL_RECOVERY);
// if ManualRecovery property is not set, do not attempt XA recovery.
if (manualRecovery == null ||
!(manualRecovery.equalsIgnoreCase("true"/*#Frozen*/))) {
try {
resyncComplete(false, false);
} catch (Throwable ex) { }
return;
}
if (Thread.currentThread().getName().equals("JTS Resync Thread"/*#Frozen*/)) {
if (uniqueRMSetReady != null) {
try {
uniqueRMSetReady.waitEvent();
xaResources = RecoveryManager.uniqueRMSet;
} catch (InterruptedException exc) {
_logger.log(Level.SEVERE,"jts.wait_for_resync_complete_interrupted");
String msg = LogFormatter.getLocalizedMessage(_logger,
"jts.wait_for_resync_complete_interrupted");
throw new org.omg.CORBA.INTERNAL(msg);
}
}
}
// sanity check
if (xaResources == null) {
try {
resyncComplete(false, false);
} catch (Throwable ex) { }
return;
}
// Get global TIDs
Map gtidMap = LogDBHelper.getInstance().getGlobalTIDMap();
Set uniqueXids = new HashSet();
while (xaResources.hasMoreElements()) {
XAResource xaResource = (XAResource) xaResources.nextElement();
// Get the list of XIDs which represent in-doubt transactions
// for the database.
Xid[] inDoubtXids = getInDoubtXids(xaResource);
// uniqueXids.clear();
if (inDoubtXids == null || inDoubtXids.length == 0) {
continue; // No in-doubt xids for this resource.
}
for (int i = 0; i < inDoubtXids.length; i++) {
// check to see if the xid belongs to this server.
String branchQualifier =
new String(inDoubtXids[i].getBranchQualifier());
String serverName = Configuration.getServerName();
if (branchQualifier.startsWith(serverName)) {
// check if the xid is a duplicate. i.e., Xids
// which have same globalId and branchId are
// considered duplicates. Note that the
// branchId format is (serverId, rmId). This is
// to make sure that at most one OTSResource object
// is registered with the coordinator per transaction
// per RM.
String xidStr = stringifyXid(inDoubtXids[i]);
if (!uniqueXids.contains(inDoubtXids[i])) { // unique xid
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager",
"dbXARecovery",
" This xid is UNIQUE " +
inDoubtXids[i]);
}
uniqueXids.add(inDoubtXids[i]); // add to uniqueList
try {
byte[] gtrid = inDoubtXids[i].getGlobalTransactionId();
GlobalTID gtid = GlobalTID.fromTIDBytes(gtrid);
Long localTID = (Long)gtidMap.get(gtid);
if (localTID == null) {
xaResource.rollback(inDoubtXids[i]);
} else {
xaResource.commit(inDoubtXids[i], true);
LogDBHelper.getInstance().deleteRecord(localTID.longValue());
}
} catch (Exception ex) { ex.printStackTrace(); }
} else {
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager",
"dbXARecovery",
" This xid is NOTUNIQUE " +
inDoubtXids[i]);
}
}
} else {
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager",
"dbXARecovery",
" This xid doesn't belong to me " +
inDoubtXids[i]);
}
}
}
}
try {
resyncComplete(false, false);
} catch (Throwable ex) { ex.printStackTrace(); }
}
/**
* Requests that the RecoveryManager proceed with recovery of XA resources
* via JTSXA.
* <p>
* JTSXA returns a list of OTSResource objects which require
* outcomes. These are registered with appropriate Coordinators or rolled
* back as appropriate.
*
/**
* Requests that the RecoveryManager proceed with recovery of XA resources
* via JTSXA.
* <p>
* JTSXA returns a list of OTSResource objects which require
* outcomes. These are registered with appropriate Coordinators or rolled
* back as appropriate.
*
* @param
*
* @return
*
* @see
*/
/*
* DISCARD(Ram J) - this method is not needed anymore. This has been
* replaced by proceedWithXARecovery method.
*/
/*
private static void recoverXA() {
boolean result = false;
// Get a list of OTSResource objects from JTSXA.
Vector resources = new Vector();
JTSXA.recover(resources);
Enumeration res = resources.elements();
// For each OTSResource, determine whether the transaction is known,
// and if so, register it, otherwise roll it back.
while (res.hasMoreElements()) {
TxOTSResource xares = (TxOTSResource) res.nextElement();
GlobalTID globalTID = new GlobalTID(xares.getGlobalTID());
TopCoordinator coord =
(TopCoordinator) coordsByGlobalTID.get(globalTID);
// report();
if (coord == null) {
// Roll the OTSResource back if the transaction is not
// recognised. This happens when the RM has recorded its
// prepare vote, but the JTS has not recorded its prepare vote.
try {
xares.rollback();
} catch (Throwable exc) {
_logger.log(Level.WARNING,"jts.exception_during_resync",
new java.lang.Object[] { exc.toString(), "xa_rollback"});
}
} else {
// Register the OTSResource with the Coordinator.
// It will be called for commit or rollback during resync.
coord.directRegisterResource(xares);
}
}
}
*/
/**
* Returns an array of Coordinator objects currently active.
*
* @param
*
* @return The array of Coordinators.
*
* @see
*/
static CoordinatorImpl[] getCoordinators() {
int size = coordsByGlobalTID.size();
CoordinatorImpl[] result = new CoordinatorImpl[size];
Enumeration coords = coordsByGlobalTID.elements();
for(int pos = 0;pos<size;){
result[pos++] = (CoordinatorImpl) coords.nextElement();
}
return result;
}
static Hashtable/*<GlobalTID,Coordinator>*/ getCoordsByGlobalTID()
{
return coordsByGlobalTID;
}
/**
* Gets the restart data for the process.
*
* @param
*
* @return The restart data.
*
* @see
*/
public static byte[] getRestart() {
byte[] result = null;
LogFile logFile = Configuration.getLogFile();
if (logFile != null)
result = logFile.readRestart();
return result;
}
/**
* Sets the restart data for the process.
*
* @param bytes The restart data.
*
* @return
*
* @see
*/
public static void setRestart(byte[] bytes) {
LogFile logFile = Configuration.getLogFile();
if (logFile != null) {
if (!logFile.writeRestart(bytes)) {
_logger.log(Level.WARNING,"jts.restart_write_failed");
}
}
}
/**
* Waits for recovery to complete.
*
* @param
*
* @return
*
* @see
*/
public static void waitForRecovery() {
if (recoveryInProgress != null) {
try {
recoveryInProgress.waitEvent();
} catch (InterruptedException exc) {
_logger.log(Level.SEVERE,"jts.wait_for_resync_complete_interrupted");
String msg = LogFormatter.getLocalizedMessage(_logger,
"jts.wait_for_resync_complete_interrupted");
throw new org.omg.CORBA.INTERNAL(msg);
}
}
}
/**
* Waits for resync to complete.
*
* @param
*
* @return
*
* @see
*/
public static void waitForResync() {
if (resyncInProgress != null) {
try {
resyncInProgress.waitEvent();
} catch (InterruptedException exc) {
_logger.log(Level.SEVERE,"jts.wait_for_resync_complete_interrupted");
String msg = LogFormatter.getLocalizedMessage(_logger,
"jts.wait_for_resync_complete_interrupted");
throw new org.omg.CORBA.INTERNAL(msg);
}
}
}
static void addToIncompleTx(CoordinatorImpl coord, boolean commit) {
inCompleteTxMap.put(coord, new Boolean(commit));
}
public static Boolean isIncompleteTxRecoveryRequired() {
if (inCompleteTxMap.isEmpty()) {
return Boolean.FALSE;
}
else {
return Boolean.TRUE;
}
}
public static void recoverIncompleteTx(XAResource[] xaresArray) {
if ((xaresArray == null) || (xaresArray.length == 0))
return;
int size = xaresArray.length;
Vector v = new Vector();
for (int i=0; i<size; i++) {
v.addElement(xaresArray[i]);
}
Enumeration resourceList = getUniqueRMSet(v.elements());
Set uniqueXids = new HashSet();
Vector otsResources = new Vector();
while (resourceList.hasMoreElements()) {
XAResource xaResource = (XAResource) resourceList.nextElement();
// Get the list of XIDs which represent in-doubt transactions
// for the database.
Xid[] inDoubtXids = getInDoubtXids(xaResource);
// uniqueXids.clear();
if (inDoubtXids == null || inDoubtXids.length == 0) {
continue; // No in-doubt xids for this resource.
}
for (int i = 0; i < inDoubtXids.length; i++) {
// check to see if the xid belongs to this server.
String branchQualifier =
new String(inDoubtXids[i].getBranchQualifier());
String serverName = Configuration.getServerName();
if (branchQualifier.startsWith(serverName)) {
// check if the xid is a duplicate. i.e., Xids
// which have same globalId and branchId are
// considered duplicates. Note that the
// branchId format is (serverId, rmId). This is
// to make sure that at most one OTSResource object
// is registered with the coordinator per transaction
// per RM.
String xidStr = stringifyXid(inDoubtXids[i]);
if (!uniqueXids.contains(inDoubtXids[i])) { // unique xid
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager",
"recoverIncompleteTx",
" This xid is UNIQUE " +
inDoubtXids[i]);
}
uniqueXids.add(inDoubtXids[i]); // add to uniqueList
otsResources.addElement(
new OTSResourceImpl(inDoubtXids[i],
xaResource, null
));
} else {
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager",
"recoverIncompleteTx",
" This xid is NOTUNIQUE " +
inDoubtXids[i]);
}
}
} else {
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager",
"recoverIncompleteTx",
" This xid doesn't belong to me " +
inDoubtXids[i]);
}
}
}
} // while (true)
for (int i = 0; i < otsResources.size(); i++) {
OTSResourceImpl otsResource = (OTSResourceImpl) otsResources.elementAt(i);
GlobalTID globalTID = new GlobalTID(otsResource.getGlobalTID());
synchronized (inCompleteTxMap) {
Enumeration e = inCompleteTxMap.keys();
while (e.hasMoreElements()) {
CoordinatorImpl cImpl = (CoordinatorImpl)e.nextElement();
GlobalTID gTID = new GlobalTID(cImpl.getGlobalTID());
if (gTID.equals(globalTID)) {
Boolean commit = (Boolean) inCompleteTxMap.get(cImpl);
boolean infiniteRetry = true;
int commitRetries = Configuration.getRetries();
if (commitRetries >= 0)
infiniteRetry = false;
int commitRetriesLeft = commitRetries;
boolean exceptionisThrown = true;
while (exceptionisThrown) {
try {
if (commit.booleanValue()) {
otsResource.commit_one_phase();
if(_logger.isLoggable(Level.FINE)) {
_logger.logp(Level.FINE,"RecoveryManager",
"recoverIncompleteTx",
" committed " +
otsResource);
}
}
else {
otsResource.rollback();
if(_logger.isLoggable(Level.FINE)) {
_logger.logp(Level.FINE,"RecoveryManager",
"recoverIncompleteTx",
" rolled back " +
otsResource);
}
}
exceptionisThrown = false;
} catch (Throwable exc) {
if ((exc instanceof COMM_FAILURE) || (exc instanceof TRANSIENT)) {
if (commitRetriesLeft > 0 || infiniteRetry) {
// For TRANSIENT or COMM_FAILURE, wait
// for a while, then retry the commit.
if (!infiniteRetry) {
commitRetriesLeft--;
}
try {
Thread.sleep(Configuration.COMMIT_RETRY_WAIT);
} catch( Throwable iex ) {}
}
else {
_logger.log(Level.WARNING,"jts.exception_during_resync",
new java.lang.Object[] {exc.toString(),"OTSResource rollback"});
exceptionisThrown = false;
}
}
else {
_logger.log(Level.WARNING,"jts.exception_during_resync",
new java.lang.Object[] {exc.toString(),"OTSResource rollback"});
exceptionisThrown = false;
}
}
}
}
}
}
}
}
static void createRecoveryFile(String serverName) {
try {
int[] result = new int[1];
String logPath = Configuration.getDirectory(Configuration.LOG_DIRECTORY,
Configuration.JTS_SUBDIRECTORY,
result);
if( result[0] == Configuration.DEFAULT_USED ||
result[0] == Configuration.DEFAULT_INVALID ) {
if( result[0] == Configuration.DEFAULT_INVALID ) {
logPath = ".";
}
}
File recoveryFile = LogControl.recoveryIdentifierFile(serverName,logPath);
RandomAccessFile raf = new RandomAccessFile(recoveryFile,"rw");
raf.writeBytes(serverName);
raf.setLength(serverName.length());
raf.close();
} catch (Exception ex) {
_logger.log(Level.WARNING,"jts.exception_in_recovery_file_handling",ex);
}
}
/**
* Register the implementation of Automatice Transaction recovery.
* This service is started as soon as all the resources are available.
*/
public static void registerTransactionRecoveryService(TransactionRecovery txRecoveryService) {
txRecovery = txRecoveryService;
}
/**
* return the autoTxRecoveryObject
*/
static TransactionRecovery getTransactionRecovery() {
return txRecovery;
}
/**
* Reports the contents of the RecoveryManager tables.
* $Only required for debug.
*
* @param immediate Indicates whether to stop immediately.
*
* @return
*
* @see
*/
/*
static void report() {
// Report on coordsByGlobalTID.
if (coordsByGlobalTID.size() > 0) {
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager","report()",
"RecoveryManager.coordsByGlobalTID non-empty");
}
Enumeration keys = coordsByGlobalTID.keys();
while (keys.hasMoreElements()) {
GlobalTID globalTID = (GlobalTID) keys.nextElement();
CoordinatorImpl coordImpl =
(CoordinatorImpl) coordsByGlobalTID.get(globalTID);
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager","report()",
"GlobalTid :"+globalTID+" -> "+coordImpl);
}
}
} else {
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager","report()",
"RecoveryManager.coordsByGlobalTID empty");
}
}
// Report on coordsByLocalTID.
if (coordsByLocalTID.size() > 0) {
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager","report()",
"RecoveryManager.coordsByLocalTID non-empty");
}
Enumeration keys = coordsByLocalTID.keys();
while (keys.hasMoreElements()) {
Long localTID = (Long)keys.nextElement();
CoordinatorImpl coordImpl =
(CoordinatorImpl) coordsByLocalTID.get(localTID);
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager","report()",
"LocalTid:"+localTID+" -> " + coordImpl);
}
}
} else {
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryManager","report()",
"RecoveryManager.coordsByLocalTID empty");
}
}
}
*/
}
/**
* This class represents a thread on which the RecoveryManager can perform
* resync operations.
*
* @version 0.01
*
* @author Simon Holdsworth, IBM Corporation
*
* @see
*/
//----------------------------------------------------------------------------
// CHANGE HISTORY
//
// Version By Change Description
// 0.01 SAJH Initial implementation.
//----------------------------------------------------------------------------
class ResyncThread extends Thread {
/**
* ResyncThread constructor.
*
* @param
*
* @return
*
* @see
*/
static Logger _logger = LogDomains.getLogger(LogDomains.TRANSACTION_LOGGER);
ResyncThread() {
setName("JTS Resync Thread"/*#Frozen*/);
setDaemon(true);
}
/**
* Performs resync.
*
* @param
*
* @return
*
* @see
*/
public void run() {
yield();
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"ResyncThread","run()","Before invoking RecoveryManager.recover()");
}
try {
if (Configuration.isDBLoggingEnabled()) {
RecoveryManager.dbXARecovery();
} else {
if (RecoveryManager.recover()) {
RecoveryManager.resync();
}
}
RecoveryManager.resyncComplete(false,false);// Extra Gaurd
} catch (Throwable ex) {
try {
RecoveryManager.resyncComplete(false,false);
} catch (Throwable tex) {tex.printStackTrace();} // forget any exeception in resyncComplete
_logger.log(Level.SEVERE,"jts.log_exception_at_recovery",ex);
}
if(RecoveryManager.getTransactionRecovery() != null)
RecoveryManager.getTransactionRecovery().lowerFence();
}
}
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