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package com.sun.enterprise.distributedtx;
import javax.transaction.TransactionSynchronizationRegistry;
import com.sun.enterprise.Switch;
import com.sun.enterprise.util.i18n.StringManager;
import javax.transaction.Synchronization;
import javax.transaction.Status;
import javax.transaction.SystemException;
public class TransactionSynchronizationRegistryImpl
implements TransactionSynchronizationRegistry {
/**
* Return an opaque object to represent the transaction bound to the
* current thread at the time this method is called. The returned object
* overrides <code>hashCode</code> and <code>equals</code> methods to allow
* its use as the key in a <code>java.util.HashMap</code> for use by the
* caller. If there is no transaction currently active, null is returned.
*
* <P>The returned object will return the same <code>hashCode</code> and
* compare equal to all other objects returned by calling this method
* from any component executing in the same transaction context in the
* same application server.
*
* <P>The <code>toString</code> method returns a <code>String</code>
* that might be usable by a human reader to usefully understand the
* transaction context. The result of the <code>toString</code> method
* is otherwise not defined. Specifically, there is no forward or backward
* compatibility guarantee for the result returned by the
* <code>toString</code> method.
*
* <P>The object is not necessarily serializable, and is not useful
* outside the virtual machine from which it was obtained.
*
* @return An object representing the current transaction,
* or null if no transaction is active.
*/
public Object getTransactionKey() {
try {
return Switch.getSwitch().getTransactionManager().getTransaction();
} catch (SystemException ex) {
return null;
}
}
/**
* Add an object to the map of resources being managed for
* the current transaction. The supplied key must be of a caller-
* defined class so as not to conflict with other users. The class
* of the key must guarantee that the <code>hashCode</code> and
* <code>equals</code> methods are suitable for keys in a map.
* The key and value are not examined or used by the implementation.
*
* @param key The key for looking up the associated value object.
*
* @param value The value object to keep track of.
*
* @exception IllegalStateException Thrown if the current thread
* is not associated with a transaction.
*/
public void putResource(Object key, Object value) {
try {
J2EETransaction tran = (J2EETransaction)Switch.getSwitch().
getTransactionManager().getTransaction();
if (tran == null)
throw new IllegalStateException(
sm.getString("enterprise_distributedtx.no_transaction"));
tran.putUserResource(key, value);
} catch (SystemException ex) {
throw new IllegalStateException(
sm.getString("enterprise_distributedtx.no_transaction"));
}
}
/**
* Get an object from the map of resources being managed for
* the current transaction. The key must have been supplied earlier
* by a call to <code>putResouce</code> in the same transaction. If the key
* cannot be found in the current resource map, null is returned.
*
* @param key The key for looking up the associated value object.
*
* @return The value object, or null if not found.
*
* @exception IllegalStateException Thrown if the current thread
* is not associated with a transaction.
*/
public Object getResource(Object key){
try {
J2EETransaction tran = (J2EETransaction)Switch.getSwitch().
getTransactionManager().getTransaction();
if (tran == null)
throw new IllegalStateException(
sm.getString("enterprise_distributedtx.no_transaction"));
return tran.getUserResource(key);
} catch (SystemException ex) {
throw new IllegalStateException(
sm.getString("enterprise_distributedtx.no_transaction"));
}
}
/**
* Register a <code>Synchronization</code> instance with special ordering
* semantics. The <code>beforeCompletion</code> method on the registered
* <code>Synchronization</code> will be called after all user and
* system component <code>beforeCompletion</code> callbacks, but before
* the 2-phase commit process starts. This allows user and system components to
* flush state changes to the caching manager, during their
* <code>SessionSynchronization</code> callbacks, and allows managers
* to flush state changes to Connectors, during the callbacks
* registered with this method. Similarly, the <code>afterCompletion</code>
* callback will be called after 2-phase commit completes but before
* any user and system <code>afterCompletion</code> callbacks.
*
* <P>The <code>beforeCompletion</code> callback will be invoked in the
* transaction context of the current transaction bound to the thread
* of the caller of this method, which is the same transaction context
* active at the time this method is called. Allowable methods include
* access to resources, for example, Connectors. No access is allowed to
* user components, for example, timer services or bean methods,
* as these might change the state of POJOs, or plain old Java objects,
* being managed by the caching manager.
*
* <P>The <code>afterCompletion</code> callback will be invoked in an
* undefined transaction context. No access is permitted to resources or
* user components as defined above. Resources can be closed, but
* no transactional work can be performed with them.
*
* <P>Other than the transaction context, no component J2EE context is
* active during either of the callbacks.
*
* @param sync The synchronization callback object.
*
* @exception IllegalStateException Thrown if the current thread
* is not associated with a transaction.
*/
public void registerInterposedSynchronization(Synchronization sync) {
try {
J2EETransaction tran = (J2EETransaction)Switch.getSwitch().
getTransactionManager().getTransaction();
if (tran == null)
throw new IllegalStateException(
sm.getString("enterprise_distributedtx.no_transaction"));
tran.registerInterposedSynchronization(sync);
} catch (SystemException ex) {
throw new IllegalStateException(
sm.getString("enterprise_distributedtx.no_transaction"));
}
}
/**
* Returns the status of the transaction bound to the current thread.
* This is the result of executing <code>getStatus</code> method on the
* <code>TransactionManager</code>, in the current transaction context.
*
* @return The status of the current transaction.
*/
public int getTransactionStatus() {
try {
return Switch.getSwitch().getTransactionManager().getStatus();
} catch (SystemException ex) {
return Status.STATUS_NO_TRANSACTION;
}
}
/**
* Set the <code>rollbackOnly</code> status of the transaction bound to the
* current thread.
*
* @exception IllegalStateException Thrown if the current thread
* is not associated with a transaction.
*/
public void setRollbackOnly() {
try {
Switch.getSwitch().getTransactionManager().setRollbackOnly();
} catch (SystemException ex) {
throw new IllegalStateException(
sm.getString("enterprise_distributedtx.no_transaction"));
}
}
/**
* Get the <code>rollbackOnly</code> status of the transaction bound to the
* current thread.
*
* @return true, if the current transaction is marked for rollback only.
*
* @exception IllegalStateException Thrown if the current thread
* is not associated with a transaction.
*/
public boolean getRollbackOnly() {
{
int status = getTransactionStatus();
if ( status == Status.STATUS_NO_TRANSACTION ) {
throw new IllegalStateException(
sm.getString("enterprise_distributedtx.no_transaction"));
}
if ( status == Status.STATUS_MARKED_ROLLBACK
|| status == Status.STATUS_ROLLING_BACK )
return true;
else
return false;
}
}
public static TransactionSynchronizationRegistry getInstance() {
return _instance;
}
private static TransactionSynchronizationRegistryImpl _instance =
new TransactionSynchronizationRegistryImpl();
private static StringManager sm =
StringManager.getManager(TransactionSynchronizationRegistryImpl.class);
}
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