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package javax.transaction;
/**
* This interface is intended for use by system level application server
* components such as persistence managers, resource adapters, as well as
* EJB and Web application components. This provides the ability to
* register synchronization objects with special ordering semantics,
* associate resource objects with the current transaction, get the
* transaction context of the current transaction, get current transaction
* status, and mark the current transaction for rollback.
*
* This interface is implemented by the application server by a
* stateless service object. The same object can be used by any number of
* components with thread safety.
*
* <P>In standard application server environments, an instance
* implementing this interface can be looked up by a standard name via JNDI.
* The standard name is java:comp/TransactionSynchronizationRegistry.
*
* @since JTA 1.1
*/
public interface TransactionSynchronizationRegistry {
/**
* Return an opaque object to represent the transaction bound to the
* current thread at the time this method is called. This object
* overrides hashCode and equals to allow its use as the key in a
* hashMap for use by the caller. If there is no transaction currently
* active, return null.
*
* <P>This object will return the same hashCode 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 toString method returns a String that might be usable by a
* human reader to usefully understand the transaction context. The
* toString result is otherwise not defined. Specifically, there is no
* forward or backward compatibility guarantee of the results of
* toString.
*
* <P>The object is not necessarily serializable, and has no defined
* behavior outside the virtual machine whence it was obtained.
*
* @return an opaque object representing the transaction bound to the
* current thread at the time this method is called.
*
* @since JTA 1.1
*/
Object getTransactionKey();
/**
* Add or replace an object in the Map of resources being managed for
* the transaction bound to the current thread at the time this
* method is called. The supplied key should be of an caller-
* defined class so as not to conflict with other users. The class
* of the key must guarantee that the hashCode and equals methods are
* suitable for use as keys in a map. The key and value are not examined
* or used by the implementation. The general contract of this method
* is that of {@link java.util.Map#put(Object, Object)} for a Map that
* supports non-null keys and null values. For example,
* if there is already an value associated with the key, it is replaced
* by the value parameter.
*
* @param key the key for the Map entry.
* @param value the value for the Map entry.
* @exception IllegalStateException if no transaction is active.
* @exception NullPointerException if the parameter key is null.
*
* @since JTA 1.1
*/
void putResource(Object key, Object value);
/**
* Get an object from the Map of resources being managed for
* the transaction bound to the current thread at the time this
* method is called. The key should have been supplied earlier
* by a call to putResouce in the same transaction. If the key
* cannot be found in the current resource Map, null is returned.
* The general contract of this method
* is that of {@link java.util.Map#get(Object)} for a Map that
* supports non-null keys and null values. For example,
* the returned value is null if there is no entry for the parameter
* key or if the value associated with the key is actually null.
*
* @param key the key for the Map entry.
* @return the value associated with the key.
* @exception IllegalStateException if no transaction is active.
* @exception NullPointerException if the parameter key is null.
*
* @since JTA 1.1
*/
Object getResource(Object key);
/**
* Register a Synchronization instance with special ordering
* semantics. Its beforeCompletion will be called after all
* SessionSynchronization beforeCompletion callbacks and callbacks
* registered directly with the Transaction, but before the 2-phase
* commit process starts. Similarly, the afterCompletion
* callback will be called after 2-phase commit completes but before
* any SessionSynchronization and Transaction afterCompletion callbacks.
*
* <P>The beforeCompletion callback will be invoked in the transaction
* context of the transaction bound to the current thread at the time
* this method is called.
* Allowable methods include access to resources,
* e.g. Connectors. No access is allowed to "user components" (e.g. timer
* services or bean methods), as these might change the state of data
* being managed by the caller, and might change the state of data that
* has already been flushed by another caller of
* registerInterposedSynchronization.
* The general context is the component
* context of the caller of registerInterposedSynchronization.
*
* <P>The afterCompletion callback will be invoked in an undefined
* context. No access is permitted to "user components"
* as defined above. Resources can be closed but no transactional
* work can be performed with them.
*
* <P>If this method is invoked without an active transaction context, an
* IllegalStateException is thrown.
*
* <P>If this method is invoked after the two-phase commit processing has
* started, an IllegalStateException is thrown.
*
* @param sync the Synchronization instance.
* @exception IllegalStateException if no transaction is active.
*
* @since JTA 1.1
*/
void registerInterposedSynchronization(Synchronization sync);
/**
* Return the status of the transaction bound to the
* current thread at the time this method is called.
* This is the result of executing TransactionManager.getStatus() in
* the context of the transaction bound to the current thread at the time
* this method is called.
*
* @return the status of the transaction bound to the current thread
* at the time this method is called.
*
* @since JTA 1.1
*/
int getTransactionStatus();
/**
* Set the rollbackOnly status of the transaction bound to the
* current thread at the time this method is called.
*
* @exception IllegalStateException if no transaction is active.
*
* @since JTA 1.1
*/
void setRollbackOnly();
/**
* Get the rollbackOnly status of the transaction bound to the
* current thread at the time this method is called.
*
* @return the rollbackOnly status.
* @exception IllegalStateException if no transaction is active.
*
* @since JTA 1.1
*/
boolean getRollbackOnly();
}
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