Glassfish example source code file (DelegatedRecoveryManager.java)
The Glassfish DelegatedRecoveryManager.java source code/*
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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 com.sun.jts.codegen.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.jts.utils.RecoveryHooks.FailureInducer;
/**
* This class manages information required for Delegated recovery. This class supports
* multiple delegated recoveries at the same time. Functionality is alsomost same as
* RecoveryManager.java. This class maintains the map between state and log location
* instead of static data incase of Recovery Manager.
*
* @version 0.01
*
* @author Sankara Rao Bhogi
*
* @see
*/
public class DelegatedRecoveryManager {
private static Hashtable recoveryStatetable = new Hashtable();
private static Hashtable tmoutMgrtable = new Hashtable();
synchronized static DelegatedTimeoutManager getTimeoutManager(String logPath) {
DelegatedTimeoutManager tmoutMgr = (DelegatedTimeoutManager)tmoutMgrtable.get(logPath);
if (tmoutMgr != null)
return tmoutMgr;
tmoutMgr = new DelegatedTimeoutManager(logPath);
tmoutMgrtable.put(logPath,tmoutMgr);
return tmoutMgr;
}
static Logger _logger = LogDomains.getLogger(DelegatedRecoveryManager.class, LogDomains.TRANSACTION_LOGGER);
static boolean addCoordinator(GlobalTID globalTID,
Long localTID, CoordinatorImpl coord, int timeout, String logPath) {
boolean result = true;
RecoveryStateHolder state = (RecoveryStateHolder)recoveryStatetable.get(logPath);
// Attempt to add the global and local indentifier to
// Coordinator associations to the maps.
state.coordsByGlobalTID.put(globalTID,coord);
state.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) {
DelegatedTimeoutManager tmoutMgr = getTimeoutManager(logPath);
tmoutMgr.setTimeout(localTID, DelegatedTimeoutManager.ACTIVE_TIMEOUT,
timeout);
}
return result;
}
static boolean removeCoordinator(GlobalTID globalTID,
Long localTID, boolean aborted, String logPath) {
boolean result = false;
RecoveryStateHolder state = (RecoveryStateHolder)recoveryStatetable.get(logPath);
// Remove the global identifier to Coordinator mapping if possible.
CoordinatorImpl coord = null;
result = (state.coordsByGlobalTID.remove(globalTID) != null);
// Remove the InternalTid to Coordinator mapping if possible.
if (result) {
coord = (CoordinatorImpl) state.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()) {
CoordinatorLog.removeLog(localTID, logPath);
}
} catch(SystemException exc) {
result = false;
}
}
// Clear the timeout for the transaction, if any.
// Perform the removal under the timer mutex.
DelegatedTimeoutManager tmoutMgr = getTimeoutManager(logPath);
tmoutMgr.setTimeout(localTID, DelegatedTimeoutManager.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 (state.resyncCoords > 0) {
state.resyncCoords--;
// If the number of resyncing Coordinators is now zero,
// we may allow new work.
if (state.resyncCoords == 0) {
try {
resyncComplete(true, true, logPath);
} catch (Throwable exc) {
}
}
}
return result;
}
static CoordinatorImpl getCoordinator(GlobalTID globalTID, String logPath) {
RecoveryStateHolder state = (RecoveryStateHolder)recoveryStatetable.get(logPath);
CoordinatorImpl result = (CoordinatorImpl)
state.coordsByGlobalTID.get(globalTID);
return result;
}
public static boolean delegated_recover(String logPath, XAResource[] resources) throws Exception {
try {
File recoveryFile = new File(logPath,LogControl.RECOVERY_STRING_FILE_NAME);
RandomAccessFile raf = new RandomAccessFile(recoveryFile,"r");
long length = raf.length();
byte b1[] = new byte[(int)length]; // length is very small
raf.readFully(b1);
String serverName = new String(b1);
raf.close();
return delegated_recover(serverName,logPath,resources);
} catch (IOException ex) {
_logger.log(Level.WARNING,"jts.exception_in_recovery_file_handling",ex);
throw ex;
// return false;
}
}
public static boolean delegated_recover(String serverName, String logPath, XAResource[] resources) throws Exception {
if (logPath == null || serverName == null) {
return false;
}
Configuration.setServerName(logPath,serverName);
boolean result = false;
boolean keypointRequired = false;
RecoveryStateHolder state = new RecoveryStateHolder();
recoveryStatetable.put(logPath,state);
Enumeration logRecords = CoordinatorLog.getLogged(logPath);
while (logRecords.hasMoreElements()) {
keypointRequired = true;
try {
(new TopCoordinator()).delegated_reconstruct((CoordinatorLog) logRecords.nextElement(), logPath);
} catch(Exception exc) {
_logger.log(Level.SEVERE,"jts.recovery_in_doubt_exception",exc);
String msg = LogFormatter.getLocalizedMessage(_logger, "jts.recovery_in_doubt",
new java.lang.Object[] {exc.toString()});
throw new org.omg.CORBA.INTERNAL(msg);
}
}
int size = resources.length;
Vector v = new Vector();
for (int i=0; i<size; i++) {
v.addElement(resources[i]);
}
state.uniqueRMSet = getUniqueRMSet(v.elements());
proceedWithXARecovery(logPath);
state.recoveryInProgress.post();
// If resync is not needed, then perform after-resync
// tasks immediately.
result = state.coordsByGlobalTID.size() > 0;
if (!result) {
try {
resyncComplete(false,keypointRequired,logPath);
} catch(Throwable exc) {}
}
if (result)
resync(logPath);
return true;
}
static void resync(String logPath) {
// 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).
RecoveryStateHolder recoveryState = (RecoveryStateHolder)recoveryStatetable.get(logPath);
recoveryState.resyncCoords = recoveryState.coordsByGlobalTID.size();
Enumeration resyncList =
((Hashtable) recoveryState.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.
FailureInducer.waitInRecovery();
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.
DelegatedTimeoutManager tmoutMgr = getTimeoutManager(logPath);
tmoutMgr.setTimeout(
new Long(coord.getLocalTID()),
DelegatedTimeoutManager.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,"DelegatedRecoveryManager","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,"DelegatedRecoveryManager","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.
}
private static void resyncComplete(boolean resynced,
boolean keypointRequired, String logPath) throws LogicErrorException {
RecoveryStateHolder state = (RecoveryStateHolder)recoveryStatetable.get(logPath);
// 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(logPath);
}
// Post the resync in progress event semaphore.
state.resyncInProgress.post();
state.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.
*
* @param logPath log location for which the delegated recovery is done
*
* @return The Coordinator object.
*
* @see
*/
static CoordinatorImpl getLocalCoordinator(Long localTID, String logPath) {
RecoveryStateHolder state = (RecoveryStateHolder)recoveryStatetable.get(logPath);
CoordinatorImpl result = (CoordinatorImpl)
state.coordsByLocalTID.get(localTID);
return result;
}
/**
* Determines whether the local transaction identifier represents a valid
* transaction.
*
* @param localTID The local transaction identifier to check.
*
* @param logPath log location for which the delegated recovery is done
*
* @return Indicates the local transaction identifier is valid.
*
* @see
*/
static boolean validLocalTID(Long localTID, String logPath) {
RecoveryStateHolder state = (RecoveryStateHolder)recoveryStatetable.get(logPath);
boolean result = state.coordsByLocalTID.containsKey(localTID);
return result;
}
/**
* Informs the DelegatedRecoveryManager 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) {
Enumeration keys = recoveryStatetable.keys();
if (keys.hasMoreElements()) {
String logPath = (String)keys.nextElement();
RecoveryStateHolder state = (RecoveryStateHolder)recoveryStatetable.get(logPath);
if (immediate) {
// If immediate, stop the resync thread if any.
} else {
// Otherwise ensure that resync has completed.
if (state.resyncInProgress != null) {
try {
state.resyncInProgress.waitEvent();
} 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) {
CoordinatorLog.keypoint(logPath);
CoordinatorLog.finalizeAll(logPath);
}
//$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();
}
/**
* 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(String logPath) {
RecoveryStateHolder state = (RecoveryStateHolder)recoveryStatetable.get(logPath);
/* This method has been newly added - Ram Jeyaraman */
Enumeration xaResources = state.uniqueRMSet;
// 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 = RecoveryManager.getInDoubtXids(xaResource);
// uniqueXids.clear();
if (inDoubtXids == null || inDoubtXids.length == 0) {
continue; // go to the next 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(logPath);
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,"DelegatedRecoveryManager",
"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,"DelegatedRecoveryManager",
"proceedWithXARecovery",
" This xid is NOTUNIQUE " +
inDoubtXids[i]);
}
}
} else {
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"DelegatedRecoveryManager",
"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) state.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,"DelegatedRecoveryManager","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,"DelegatedRecoveryManager",
"proceedWithXARecovery()",
"Recognized OTSResource: " + otsResource +
" with tid: " +
LogFormatter.convertToString(globalTID.realTID.tid) +
";Hence registering this resource with coordinator...");
}
coord.directRegisterResource(otsResource);
}
}
}
/**
* Returns an array of Coordinator objects currently active.
*
* @param logPath log location for which the delegated recovery is done
*
* @return The array of Coordinators.
*
* @see
*/
static CoordinatorImpl[] getCoordinators(String logPath) {
RecoveryStateHolder state = (RecoveryStateHolder)recoveryStatetable.get(logPath);
int size = state.coordsByGlobalTID.size();
CoordinatorImpl[] result = new CoordinatorImpl[size];
Enumeration coords = state.coordsByGlobalTID.elements();
for(int pos = 0;pos<size;){
result[pos++] = (CoordinatorImpl) coords.nextElement();
}
return result;
}
static Hashtable/*<GlobalTID,Coordinator>*/ getCoordsByGlobalTID(String logPath) {
RecoveryStateHolder state = (RecoveryStateHolder)recoveryStatetable.get(logPath);
return state.coordsByGlobalTID;
}
public static void waitForRecovery(String logPath) {
RecoveryStateHolder state = (RecoveryStateHolder)recoveryStatetable.get(logPath);
if (state.recoveryInProgress != null) {
try {
state.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 logPath log location for which the delegated recovery is done
*
* @return
*
* @see
*/
public static void waitForResync(String logPath) {
RecoveryStateHolder state = (RecoveryStateHolder)recoveryStatetable.get(logPath);
if (state.resyncInProgress != null) {
try {
state.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);
}
}
}
}
class RecoveryStateHolder {
/**
* list of XA Resources to be recovered.
*/
Enumeration uniqueRMSet = null;
/**
* 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.
*/
int resyncCoords = 0;
/**
* This attribute is used to block new requests while there are
* Coordinators which still require resync.
*/
EventSemaphore resyncInProgress = new EventSemaphore();
/**
* This attribute is used to block requests against RecoveryCoordinators or
* CoordinatorResources before recovery has completed.
*/
EventSemaphore recoveryInProgress = new EventSemaphore();
Hashtable coordsByGlobalTID = new Hashtable();
Hashtable coordsByLocalTID = new Hashtable();
Hashtable transactionIds = new Hashtable();
}
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