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/**
* Copyright (C) 2000-2019 Atomikos
*
* LICENSE CONDITIONS
*
* See http://www.atomikos.com/Main/WhichLicenseApplies for details.
*/
package com.atomikos.datasource.xa;
import java.util.Collection;
import java.util.Hashtable;
import java.util.Stack;
import javax.transaction.xa.XAException;
import javax.transaction.xa.XAResource;
import com.atomikos.datasource.RecoverableResource;
import com.atomikos.datasource.ResourceException;
import com.atomikos.datasource.ResourceTransaction;
import com.atomikos.datasource.TransactionalResource;
import com.atomikos.icatch.CompositeTransaction;
import com.atomikos.icatch.RecoveryService;
import com.atomikos.icatch.SysException;
import com.atomikos.logging.Logger;
import com.atomikos.logging.LoggerFactory;
import com.atomikos.recovery.PendingTransactionRecord;
import com.atomikos.recovery.xa.XARecoveryManager;
/**
*
*
* An abstract XA implementation of a transactional resource.
*
* For a particular XA data source, it is necessary to implement the
* refreshXAConnection method, because in general there is no standard way of
* getting XAResource instances. Therefore, this class is agnostic about it.
*
* It is assumed that there is at most one instance per (root transaction,
* server) combination. Otherwise, siblings can not be mapped to the same
* ResourceTransaction! This instance is responsible for mapping siblings to
* ResourceTransaction instances.
*/
public abstract class XATransactionalResource implements TransactionalResource
{
private static final Logger LOGGER = LoggerFactory.createLogger(XATransactionalResource.class);
protected XAResource xares_;
private String uniqueResourceName;
private Hashtable rootTransactionToSiblingMapperMap;
private XidFactory xidFact;
private boolean closed;
private String branchIdentifier;
private static final String MAX_LONG_STR = String.valueOf(Long.MAX_VALUE);
private static final int MAX_LONG_LEN = MAX_LONG_STR.getBytes().length;
/**
* Construct a new instance with a default XidFactory.
*
*/
public XATransactionalResource ( String uniqueResourceName )
{
this.uniqueResourceName = uniqueResourceName;
this.rootTransactionToSiblingMapperMap = new Hashtable();
// name should be less than 64 for xid compatibility
//branch id is server name + long value!
if ( uniqueResourceName.getBytes ().length > 64- MAX_LONG_LEN )
throw new RuntimeException (
"Max length of resource name exceeded: should be less than " + ( 64 - MAX_LONG_LEN ) );
this.xidFact = new DefaultXidFactory ();
this.closed = false;
}
/**
* Construct a new instance with a custom XidFactory.
*
*
*/
public XATransactionalResource ( String uniqueResourceName , XidFactory factory )
{
this ( uniqueResourceName );
this.xidFact = factory;
}
/**
* Utility method to establish and refresh the XAResource. An XAResource is
* actually a connection to a back-end resource, and this connection needs
* to stay open for the transactional resource instance. The resource uses
* the XAResource regularly, but sometimes the back-end server can close the
* connection after a time-out. At intialization time and also after such a
* time-out, this method is called to refresh the XAResource instance. This
* is typically done by (re-)establishing a connection to the server and
* keeping this connection open!.
*
* @return XAResource A XAResource instance that will be used to represent
* the server.
* @exception ResourceException
* On failure.
*/
protected abstract XAResource refreshXAConnection ()
throws ResourceException;
/**
* Get the xidFactory for this instance. Needed by XAResourceTransaction to
* create new XID.
*
* @return XidFactory The XidFactory for the resource.
*/
public XidFactory getXidFactory ()
{
return this.xidFact;
}
void removeSiblingMap ( String root )
{
synchronized ( this.rootTransactionToSiblingMapperMap ) {
this.rootTransactionToSiblingMapperMap.remove ( root );
}
}
private SiblingMapper getSiblingMap ( String root )
{
synchronized ( this.rootTransactionToSiblingMapperMap ) {
if ( this.rootTransactionToSiblingMapperMap.containsKey ( root ) )
return this.rootTransactionToSiblingMapperMap.get ( root );
else {
SiblingMapper map = new SiblingMapper ( this , root );
this.rootTransactionToSiblingMapperMap.put ( root, map );
return map;
}
}
}
/**
* Check if the XAResource needs to be refreshed.
*
* @return boolean True if the XAResource needs refresh.
*/
protected boolean needsRefresh ()
{
boolean ret = true;
// check if connection has not timed out
try {
// we should be the same as ourselves!
// NOTE: xares_ is null if no connection could be gotten
// in that case we just return true
// otherwise, test the xaresource liveness
if ( this.xares_ != null ) {
this.xares_.isSameRM ( this.xares_ );
ret = false;
}
} catch ( XAException xa ) {
// timed out?
if ( LOGGER.isTraceEnabled() ) LOGGER.logTrace ( this.uniqueResourceName
+ ": XAResource needs refresh?", xa );
}
return ret;
}
/**
* Test if the XAResource is used by this instance.
*
* @param xares
* The XAResource to test.
* @return boolean True iff this instance uses the same back-end resource,
* in as far as this can be determined by this instance.
*/
public boolean usesXAResource ( XAResource xares )
{
XAResource xaresource = getXAResource ();
if (xaresource == null) return false;
// if no connection could be gotten
boolean ret = false;
if ( !xares.getClass ().getName ().equals (
xaresource.getClass ().getName () ) ) {
// if the implementation classes are different,
// the resources are not the same
// this check is needed to cope with
// vendor-specific errors in XAResource.isSameRM()
ret = false;
} else {
// in this case, the implementation class names are the same
// so delegate to xares instances
try {
if ( xares.isSameRM ( xaresource ) ) {
ret = true;
} else {
LOGGER.logTrace ( "XAResources claim to be different: "
+ xares + " and " + xaresource );
}
} catch ( XAException xe ) {
throw new SysException ( "Error in XAResource comparison: "
+ xe.getMessage (), xe );
}
}
return ret;
}
/**
* Get the XAResource instance that this instance is using.
*
* @return XAResource The XAResource instance.
*/
public synchronized XAResource getXAResource ()
{
// null on first invocation
if ( needsRefresh () ) {
refreshXAResource();
}
return this.xares_;
}
/**
* @see TransactionalResource
*/
@SuppressWarnings("unchecked")
@Override
public ResourceTransaction getResourceTransaction ( CompositeTransaction ct )
throws ResourceException, IllegalStateException
{
if ( this.closed ) throw new IllegalStateException("XATransactionResource already closed");
if ( ct == null ) return null; // happens in create method of beans?
Stack lineage = ct.getLineage ();
String root = null;
if (lineage == null || lineage.isEmpty ()) root = ct.getTid ();
else {
Stack tmp = (Stack) lineage.clone ();
while ( !tmp.isEmpty() ) {
CompositeTransaction next = (CompositeTransaction) tmp.pop();
if (next.isRoot()) root = next.getTid ();
}
}
return getSiblingMap ( root ).findOrCreateBranchForTransaction ( ct );
}
/**
* @see TransactionalResource
*/
@Override
public String getName ()
{
return this.uniqueResourceName;
}
/**
* The default close operation. Subclasses may need to override this method
* in order to process XA-specific close procedures such as closing
* connections.
*
*/
@Override
public void close () throws ResourceException
{
this.closed = true;
}
/**
* Test if the resource is closed.
*
* @return boolean True if closed.
* @throws ResourceException
*/
@Override
public boolean isClosed () throws ResourceException
{
return this.closed;
}
/**
* @see RecoverableResource
*/
@Override
public boolean isSameRM ( RecoverableResource res )
throws ResourceException
{
if ( res == null || !(res instanceof XATransactionalResource) ) {
return false;
}
XATransactionalResource xatxres = (XATransactionalResource) res;
if ( xatxres.uniqueResourceName == null || this.uniqueResourceName == null ) {
return false;
}
if (xatxres.uniqueResourceName.equals ( this.uniqueResourceName )) {
return true;
}
try {
if (xares_ != null) {
XAResource other = xatxres.getXAResource();
if (other != null) {
return xares_.isSameRM(other); //cf case 170618
}
}
} catch (XAException e) {
String msg = "Failed to compare XAResources";
XAExceptionHelper.formatLogMessage(msg, e, "pessimistically assuming they are different");
}
return false;
}
/**
* @see RecoverableResource
*/
@Override
public void setRecoveryService ( RecoveryService recoveryService )
throws ResourceException
{
if ( recoveryService != null ) {
if ( LOGGER.isTraceEnabled() ) LOGGER.logTrace ( "Installing recovery service on resource "
+ getName () );
this.branchIdentifier=recoveryService.getName();
}
}
/**
* Set the XID factory, needed for online management tools.
*
* @param factory
*/
public void setXidFactory(XidFactory factory) {
this.xidFact = factory;
}
/**
* Create an XID for the given tx.
*
* @param tid
* The tx id.
* @return Xid A globally unique Xid that can be recovered by any resource
* that connects to the same EIS.
*/
protected XID createXid(String tid) {
if (this.branchIdentifier == null) throw new IllegalStateException("Not yet initialized");
return getXidFactory().createXid (tid , this.branchIdentifier, this.uniqueResourceName);
}
@Override
public boolean recover(long startOfRecoveryScan, Collection expiredCommittingCoordinators, Collection indoubtForeignCoordinatorsToKeep) {
boolean ret = false;
XARecoveryManager xaResourceRecoveryManager = XARecoveryManager.getInstance();
if (xaResourceRecoveryManager != null) { //null for LogCloud recovery
if(getXAResource() != null) { //null if backend down
try {
ret = xaResourceRecoveryManager.recover(getXAResource(), startOfRecoveryScan, expiredCommittingCoordinators, indoubtForeignCoordinatorsToKeep, uniqueResourceName);
} catch (Exception e) {
LOGGER.logWarning(e.getMessage(),e); //cf case 164148 & 164147
refreshXAResource(); //cf case 156968
}
}
}
return ret;
}
private void refreshXAResource() {
LOGGER.logTrace ( this.uniqueResourceName + ": refreshing XAResource..." );
this.xares_ = refreshXAConnection ();
LOGGER.logInfo ( this.uniqueResourceName + ": refreshed XAResource" );
}
@Override
public boolean equals(Object o) {
boolean ret = false;
if (o instanceof RecoverableResource) {
RecoverableResource other = (RecoverableResource) o;
return other.isSameRM(this);
}
return ret;
}
@Override
public int hashCode() {
return 0; // pessimistic - since xaresource can be null if backend down
}
@Override
public boolean hasMoreToRecover() {
XARecoveryManager xaResourceRecoveryManager = XARecoveryManager.getInstance();
return xaResourceRecoveryManager.hasPendingXids(uniqueResourceName);
}
}
