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/*
* TransactionHelperImpl.java
*
* Created on January 17, 2002
*/
package com.sun.jdo.spi.persistence.support.sqlstore.ejb;
import javax.transaction.*;
import com.sun.jdo.api.persistence.model.ClassLoaderStrategy;
import com.sun.jdo.api.persistence.support.JDOFatalInternalException;
import com.sun.jdo.api.persistence.support.PersistenceManagerFactory;
/** This is an abstract class which is a generic implementation of the
* TransactionHelper interface. Each concrete implementation that extends
* this class is used for information about the distributed
* transaction environment.
*
* The class that extends this class must implement <code>getTransaction</code>
* and <code>getUserTransaction</code> methods and replace any other method
* implementation if it is necessary.
*
* Such class must register itself by a static method at class initialization time.
* For example,
* <blockquote><pre>
* import com.sun.jdo.spi.persistence.support.sqlstore.ejb.*;
* class blackHerringTransactionHelper extends TransactionHelperImpl {
* static EJBHelper.register(new blackHerringTransactionHelper());
* ...
* }
* </pre></blockquote>
*/
abstract public class TransactionHelperImpl
implements TransactionHelper {
static final String DEFAULT_STRING = "default"; // NOI18N
/** Set ClassLoaderStrategy to be "reload" in the managed
* environment.
*/
static {
if (System.getProperty(
ClassLoaderStrategy.PROPERTY_MULTIPLE_CLASS_LOADERS) == null)
ClassLoaderStrategy.setStrategy(
ClassLoaderStrategy.MULTIPLE_CLASS_LOADERS_RELOAD);
}
/** Identifies the managed environment behavior.
* @return true as this implementation represents the managed environment.
*/
public boolean isManaged() {
return true;
}
/** Identify the Transaction context for the calling thread, and return a
* Transaction instance that can be used to register synchronizations,
* and used as the key for HashMaps. The returned Transaction must implement
* <code>equals()</code> and <code>hashCode()</code> based on the global transaction id.
* <P>All Transaction instances returned by this method called in the same
* Transaction context must compare equal and return the same hashCode.
* The Transaction instance returned will be held as the key to an
* internal HashMap until the Transaction completes. If there is no transaction
* associated with the current thread, this method returns null.
* @return the Transaction instance for the calling thread
*/
abstract public Transaction getTransaction();
/** Returns the UserTransaction associated with the calling thread. If there
* is no transaction currently in progress, this method returns null.
* @return the UserTransaction instance for the calling thread
*/
abstract public UserTransaction getUserTransaction();
/** Translate local representation of the Transaction Status to
* javax.transaction.Status value if necessary. Otherwise this method
* should return the value passed to it as an argument.
* <P>This method is used during afterCompletion callbacks to translate
* the parameter value passed by the application server to the
* afterCompletion method. The return value must be one of:
* <code>javax.transaction.Status.STATUS_COMMITTED</code> or
* <code>javax.transaction.Status.STATUS_ROLLED_BACK</code>.
* @param st local Status value
* @return the javax.transaction.Status value of the status
*/
public int translateStatus(int st) {
return st;
}
/** Replace newly created instance of PersistenceManagerFactory
* with the hashed one if it exists. The replacement is necessary only if
* the JNDI lookup always returns a new instance. Otherwise this method
* returns the object passed to it as an argument.
*
* PersistenceManagerFactory is uniquely identified by
* ConnectionFactory.hashCode() if ConnectionFactory is
* not null; otherwise by ConnectionFactoryName.hashCode() if
* ConnectionFactoryName is not null; otherwise
* by the combination of URL.hashCode() + userName.hashCode() +
* password.hashCode() + driverName.hashCode();
*
* @param pmf PersistenceManagerFactory instance to be replaced
* @return the PersistenceManagerFactory known to the runtime
*/
public PersistenceManagerFactory replaceInternalPersistenceManagerFactory(
PersistenceManagerFactory pmf) {
return pmf;
}
/** Called at the beginning of the Transaction.beforeCompletion() to
* register the component with the app server only if necessary.
* The component argument is an array of Objects.
* The first element is com.sun.jdo.spi.persistence.support.sqlstore.Transaction
* object responsible for transaction completion.
* The second element is com.sun.jdo.api.persistence.support.PersistenceManager
* object that has been associated with the Transaction context for the
* calling thread.
* The third element is javax.transaction.Transaction object that has been
* associated with the given instance of PersistenceManager.
* The return value is passed unchanged to the postInvoke method.
*
* @param component an array of Objects
* @return implementation-specific Object
*/
public Object preInvoke(Object component) {
return null;
}
/** Called at the end of the Transaction.beforeCompletion() to
* de-register the component with the app server if necessary.
* The parameter is the return value from preInvoke, and can be any
* Object.
*
* @param im implementation-specific Object
*/
public void postInvoke(Object 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.
*
* @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 {
jta.registerSynchronization(sync);
}
/** Called in a managed environment to get a Connection from the application
* server specific resource. In a non-managed environment returns null as
* it should not be called.
* This is a generic implementation for the case of javax.sql.DataSource as
* the resource type.
*
* @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.
* @throws java.sql.SQLException.
*/
public java.sql.Connection getConnection(Object resource, String username,
String password) throws java.sql.SQLException {
java.sql.Connection rc = null;
if (resource instanceof javax.sql.DataSource) {
javax.sql.DataSource ds = (javax.sql.DataSource)resource;
if (username == null) {
rc = ds.getConnection();
} else {
rc = ds.getConnection(username, password);
}
}
return rc;
}
/** Called in a managed environment to get a non-transactional Connection
* from the application server specific resource.
*
* @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.
*/
abstract public java.sql.Connection getNonTransactionalConnection(
Object resource, String username, String password)
throws java.sql.SQLException;
/** Called in a managed environment to access a TransactionManager
* for managing local transaction boundaries and registering synchronization
* for call backs during completion of a local transaction.
*
* @return javax.transaction.TransactionManager
*/
abstract public TransactionManager getLocalTransactionManager();
/**
* This method unwraps given Statement and return the Statement from
* JDBC driver if possible.
*/
public java.sql.Statement unwrapStatement(java.sql.Statement stmt) {
return stmt;
}
/**
* Set environment specific default values for the given PersistenceManagerFactory.
* In most app servers optimistic and retainValues flags should be false.
* For any other settings this method should be overritten.
*
* @param pmf the PersistenceManagerFactory.
*/
public void setPersistenceManagerFactoryDefaults(PersistenceManagerFactory pmf) {
pmf.setOptimistic(false);
pmf.setRetainValues(false);
}
/**
* 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 String getDDLNamePrefix(Object info) {
return DEFAULT_STRING;
}
/**
* @inheritDoc
*/
public void registerApplicationLifeCycleEventListener(
ApplicationLifeCycleEventListener listener) {
}
}
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