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/*
* EJBHelper.java
*
* Created on December 15, 2000, 10:15 AM
*/
package com.sun.jdo.spi.persistence.support.sqlstore.ejb;
import java.util.ResourceBundle;
import javax.transaction.*;
import com.sun.jdo.spi.persistence.utility.I18NHelper;
import com.sun.jdo.api.persistence.support.PersistenceManagerFactory;
import com.sun.jdo.api.persistence.support.JDOFatalInternalException;
import com.sun.jdo.spi.persistence.utility.logging.Logger;
import com.sun.jdo.spi.persistence.support.sqlstore.LogHelperPersistenceManager;
/** Provides helper methods for a Forte for Java implementation with the
* application server specific information in the distributed transaction
* environment. Calls corresponding methods on the registered class which
* implements TransactionHelper interface.
*/
public class EJBHelper {
/** I18N message handler */
private final static ResourceBundle messages = I18NHelper.loadBundle(
"com.sun.jdo.spi.persistence.support.sqlstore.Bundle", // NOI18N
EJBHelper.class.getClassLoader());
/** The logger */
private static Logger logger = LogHelperPersistenceManager.getLogger();
/** Reference to a class that implements TransactionHelper interface for this
* particular application server, or DefaultTransactionHelper for a non-managed
* environment.
*/
static TransactionHelper myHelper = DefaultTransactionHelper.getInstance();
/** Register class that implements TransactionHelper interface
* Should be called by a static method at class initialization time.
* If null is passed, sets the reference to the DefaultTransactionHelper.
*
* @param h application server specific implemetation of the TransactionHelper
* interface.
*/
public static void registerTransactionHelper (TransactionHelper h) {
myHelper = h;
if (myHelper == null) {
myHelper = DefaultTransactionHelper.getInstance();
}
}
/** Returns Transaction instance that can be used to register synchronizations.
* In a non-managed environment or if there is no transaction associated with
* the current thread, this method returns null.
*
* @see TransactionHelper#getTransaction()
* @return the Transaction instance for the calling thread
*/
public static Transaction getTransaction() {
return myHelper.getTransaction();
}
/** Returns the UserTransaction associated with the calling thread. In a
* non-managed environment or if there is no transaction currently in progress,
* this method returns null.
*
* @see TransactionHelper#getUserTransaction()
* @return the UserTransaction instance for the calling thread
*/
public static UserTransaction getUserTransaction() {
return myHelper.getUserTransaction();
}
/** Identifies the managed environment behavior.
* @return true if this implementation represents the managed environment.
*/
public static boolean isManaged() {
return myHelper.isManaged();
}
/** Translates local representation of the Transaction Status to
* javax.transaction.Status value. In a non-managed environment
* returns the value passed to it as an argument.
*
* @see TransactionHelper#translateStatus(int st)
* @param local Status value
* @return the javax.transaction.Status value of the status
*/
public static int translateStatus(int st) {
return myHelper.translateStatus(st);
}
/** Returns the hashed instance of PersistenceManagerFactory
* that compares equal to the newly created instance or the instance
* itself if it is not found. In a non-managed environment returns the value
* passed to it as an argument.
*
* @see TransactionHelper#replaceInternalPersistenceManagerFactory(
* PersistenceManagerFactory pmf)
* @param pmf PersistenceManagerFactory instance to be replaced
* @return the PersistenceManagerFactory known to the runtime
*/
public static PersistenceManagerFactory replaceInternalPersistenceManagerFactory(
PersistenceManagerFactory pmf) {
return myHelper.replaceInternalPersistenceManagerFactory(pmf);
}
/** Called at the beginning of the Transaction.beforeCompletion() to register
* the component with the app server if necessary. In a non-managed environment
* or if the postInvoke method does not use the value, this method returns null.
*
* @see TransactionHelper#preInvoke(Object component)
* @param component an array of Objects
* @return implementation-specific Object
*/
public static Object preInvoke(Object component) {
return myHelper.preInvoke(component);
}
/** Called in a managed environment at the end of the Transaction.beforeCompletion()
* to de-register the component with the app server if necessary.
*
* @see TransactionHelper#postInvoke(Object im)
* @param im implementation-specific Object
*/
public static void postInvoke(Object im) {
myHelper.postInvoke(im);
}
/** Called in a managed environment to register internal Synchronization object
* with the Transaction Synchronization. If available, this registration
* provides special handling of the registered instance, calling it after
* all user defined Synchronization instances.
*
* @see Transaction#registerSynchronization(Synchronization sync)
* @see TransactionHelper#registerSynchronization(Transaction jta,
* Synchronization sync)
* @param jta the Transaction instance for the calling thread.
* @param sync the internal Synchronization instance to register.
* @throws javax.transaction.RollbackException.
* @throws javax.transaction.SystemException.
*/
public static void registerSynchronization(Transaction jta,
Synchronization sync) throws RollbackException, SystemException {
myHelper.registerSynchronization(jta, sync);
}
/** Called in a managed environment to get a Connection from the application
* server specific resource. In a non-managed environment throws an Exception
* as it should not be called.
*
* @param resource the application server specific resource.
* @param username the resource username. If null, Connection is requested
* without username and password validation.
* @param password the password for the resource username.
* @return a Connection.
* @throw java.sql.SQLException.
*/
public static java.sql.Connection getConnection(Object resource,
String username, String password) throws java.sql.SQLException {
return myHelper.getConnection(resource, username, password);
}
/** Called in a managed environment to get a non-transactional Connection
* from the application server specific resource. In a non-managed
* environment throws an Exception as it should not be called.
*
* @param resource the application server specific resource.
* @param username the resource username. If null, Connection is requested
* without username and password validation.
* @param password the password for the resource username.
* @return a Connection.
* @throw java.sql.SQLException.
*/
public static java.sql.Connection getNonTransactionalConnection(
Object resource, String username, String password)
throws java.sql.SQLException {
return myHelper.getNonTransactionalConnection(resource,
username, password);
}
/** Called in a managed environment to access a TransactionManager
* for managing local transaction boundaries and synchronization
* for local transaction completion.
*
* @return javax.transaction.TransactionManager
*/
public static TransactionManager getLocalTransactionManager() {
return myHelper.getLocalTransactionManager();
}
/**
* This method unwraps given Statement and return the Statement from
* JDBC driver if possible.
*/
public static java.sql.Statement unwrapStatement(java.sql.Statement stmt) {
return myHelper.unwrapStatement(stmt);
}
/**
* Set environment specific default values for the given PersistenceManagerFactory.
*
* @param pmf the PersistenceManagerFactory.
*/
public static void setPersistenceManagerFactoryDefaults(PersistenceManagerFactory pmf) {
myHelper.setPersistenceManagerFactoryDefaults(pmf);
}
/**
* Returns name prefix for DDL files extracted from the info instance by the
* application server specific code.
*
* @param info the instance to use for the name generation.
* @return name prefix as String.
*/
public static String getDDLNamePrefix(Object info) {
return myHelper.getDDLNamePrefix(info);
}
/**
* Called to register a ApplicationLifeCycleEventListener. If
* ApplicationLifeCycle management is active (typically in managed
* environment), the registered listener will receive a call back
* for lifecycle events.
*
* @param listener An instance of ApplicationLifeCycleEventListener.
*/
public static void registerApplicationLifeCycleEventListener(
ApplicationLifeCycleEventListener listener) {
myHelper.registerApplicationLifeCycleEventListener(listener);
}
/**
* This is the default implementation of the TransactionHelper interface
* for a non-mananged environment execution.
* In the managed environment the application server specific implementation
* registers itself with the EJBHelper to override this behavior.
*/
private static class DefaultTransactionHelper implements TransactionHelper {
private static final DefaultTransactionHelper instance = new DefaultTransactionHelper();
/**
* Returns instance of this class.
*/
public static DefaultTransactionHelper getInstance() {return instance;}
/**
* In a non-managed environment there is no transaction associated with
* the current thread, this method returns null.
*
* @see TransactionHelper#getTransaction()
* @return null;
*/
public Transaction getTransaction() { return null; }
/**
* In a non-managed environment there is no transaction currently in progress,
* this method returns null.
*
* @see TransactionHelper#getUserTransaction()
* @return the null.
*/
public UserTransaction getUserTransaction() { return null; }
/** Identifies the non-managed environment behavior.
* @return false.
*/
public boolean isManaged() { return false; }
/**
* In a non-managed environment returns the value passed to it as an argument.
*
* @see TransactionHelper#translateStatus(int st)
* @param local Status value
* @return the status value
*/
public int translateStatus(int st) { return st; }
/**
* In a non-managed environment returns the value passed to it as an argument.
*
* @see TransactionHelper#replaceInternalPersistenceManagerFactory(
* PersistenceManagerFactory pmf)
* @param pmf PersistenceManagerFactory instance to be replaced
* @return the pmf value.
*/
public PersistenceManagerFactory replaceInternalPersistenceManagerFactory(
PersistenceManagerFactory pmf) { return pmf; }
/** Called at the beginning of the Transaction.beforeCompletion() to register
* the component with the app server if necessary.
* In a non-managed environment throws JDOFatalInternalException.
*
* @see TransactionHelper#preInvoke(Object component)
* @param component an array of Objects
* @throw JDOFatalInternalException if called.
*/
public Object preInvoke(Object component) {
throw new JDOFatalInternalException(I18NHelper.getMessage(
messages, "ejb.ejbhelper.nonmanaged", "preInvoke")); //NOI18N
}
/** Called in a managed environment at the end of the Transaction.beforeCompletion()
* to de-register the component with the app server if necessary.
* In a non-managed environment throws JDOFatalInternalException.
*
* @see TransactionHelper#postInvoke(Object im)
* @param im implementation-specific Object
* @throw JDOFatalInternalException if called.
*/
public void postInvoke(Object im) {
throw new JDOFatalInternalException(I18NHelper.getMessage(
messages, "ejb.ejbhelper.nonmanaged", "postInvoke")); //NOI18N
}
/** Called in a managed environment to register internal Synchronization object
* with the Transaction Synchronization.
* In a non-managed environment it is a no-op.
*
* @see Transaction#registerSynchronization(Synchronization sync)
* @see TransactionHelper#registerSynchronization(Transaction jta,
* Synchronization sync)
* @param jta the Transaction instance for the calling thread.
* @param sync the internal Synchronization instance to register.
* @throws javax.transaction.RollbackException.
* @throws javax.transaction.SystemException.
*/
public void registerSynchronization(Transaction jta,
Synchronization sync) throws RollbackException, SystemException { }
/** Called in a managed environment to get a Connection from the application
* server specific resource.
* In a non-managed environment throws JDOFatalInternalException.
*
* @param resource the application server specific resource.
* @param username the resource username. If null, Connection is requested
* without username and password validation.
* @param password the password for the resource username.
* @throw JDOFatalInternalException if called.
* @throw java.sql.SQLException.
*/
public java.sql.Connection getConnection(Object resource,
String username, String password) throws java.sql.SQLException {
throw new JDOFatalInternalException(I18NHelper.getMessage(
messages, "ejb.ejbhelper.nonmanaged", "getConnection")); //NOI18N
}
/** Called in a managed environment to get a non-transactional Connection
* from the application server specific resource.
* In a non-managed environment throws JDOFatalInternalException.
*
* @param resource the application server specific resource.
* @param username the resource username. If null, Connection is requested
* without username and password validation.
* @param password the password for the resource username.
* @throw JDOFatalInternalException if called.
* @throw java.sql.SQLException.
*/
public java.sql.Connection getNonTransactionalConnection(
Object resource, String username, String password)
throws java.sql.SQLException {
throw new JDOFatalInternalException(I18NHelper.getMessage(
messages, "ejb.ejbhelper.nonmanaged", //NOI18N
"getNonTransactionalConnection")); //NOI18N
}
/** Called in a managed environment to access a TransactionManager
* for managing local transaction boundaries and synchronization
* for local transaction completion.
*
* @return javax.transaction.TransactionManager
*/
public TransactionManager getLocalTransactionManager() {
throw new JDOFatalInternalException(I18NHelper.getMessage(
messages, "ejb.ejbhelper.nonmanaged", "getLocalTransactionManager")); //NOI18N
}
/**
* This method unwraps given Statement and return the Statement from
* JDBC driver if possible.
*/
public java.sql.Statement unwrapStatement(java.sql.Statement stmt) {
if (stmt instanceof com.sun.jdo.spi.persistence.support.sqlstore.connection.StatementImpl) {
return ((com.sun.jdo.spi.persistence.support.sqlstore.connection.StatementImpl)stmt).unwrapStatement();
} else {
return stmt;
}
}
/**
* Set environment specific default values for the given PersistenceManagerFactory.
* In a non-managed this is a no-op.
*
* @param pmf the PersistenceManagerFactory.
*/
public void setPersistenceManagerFactoryDefaults(PersistenceManagerFactory pmf) {}
/**
* Returns name prefix for DDL files extracted from the info instance by the
* application server specific code.
* In a non-managed environment throws JDOFatalInternalException.
*
* @param info the instance to use for the name generation.
* @return name prefix as String.
*/
public String getDDLNamePrefix(Object info) {
throw new JDOFatalInternalException(I18NHelper.getMessage(
messages, "ejb.ejbhelper.nonmanaged", "getDDLNamePrefix")); //NOI18N
}
/**
* @inheritDoc
*/
public void registerApplicationLifeCycleEventListener(
ApplicationLifeCycleEventListener listener) {
// The default implementation is no-op
}
}
}
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