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package com.sun.ejb.base.sfsb.initialization;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.sun.appserv.ha.util.*;
import com.sun.ejb.spi.sfsb.initialization.PersistenceStrategyBuilder;
import com.sun.logging.LogDomains;
/**
*
* @author lwhite
*/
public class PersistenceStrategyBuilderFactory {
/**
* The default path to the EE persistence strategy builders
*only used if getEEBuilderPath fails (which should only occur
*in unit-test
*/
protected final String DEFAULT_EE_BUILDER_PATH = "com.sun.ejb.ee.sfsb.initialization";
/** Creates a new instance of PersistenceStrategyBuilderFactory */
public PersistenceStrategyBuilderFactory() {
}
private static void debug( final String s ) {}
/**
* creates the correct implementation of PersistenceStrategyBuilder
* if an invalid combination is input; an error is logged
* and MemoryStrategyBuilder is returned
*
* @param persistenceType
* @param container
* @param descriptor
*/
public PersistenceStrategyBuilder createPersistenceStrategyBuilder(
String persistenceType)
{
/* FIXME replace after testing
PersistenceTypeResolver persistenceTypeResolver
= this.getPersistenceTypeResolver();
String resolvedPersistenceType
= persistenceTypeResolver.resolvePersistenceType(persistenceType);
debug("resolvedPersistenceType = " + resolvedPersistenceType);
*/
String passedInPersistenceType = persistenceType;
PersistenceStrategyBuilder builder = new FileStrategyBuilder();
String className = createClassNameFrom(persistenceType);
if(_logger.isLoggable(Level.FINEST)) {
_logger.finest("PersistenceStrategyBuilderFactory>>createPersistenceStrategyBuilder: "
+ "CandidateBuilderClassName = " + className);
}
boolean requestedBuilderCreated = false;
try {
builder =
(PersistenceStrategyBuilder) (Class.forName(className)).newInstance();
requestedBuilderCreated = true;
} catch (ClassNotFoundException clnfEx) {
_logger.log(Level.WARNING, "Couldn't find class: "
+ className + " for persistenceType: "
+ persistenceType);
if(_logger.isLoggable(Level.FINE)) {
_logger.log(Level.FINE, "Exception while creating Builder", clnfEx);
}
} catch (Exception ex) {
_logger.log(Level.WARNING, "Exception while creating Builder", ex);
}
if (! requestedBuilderCreated) {
_logger.log(Level.WARNING, "Couldn't create builder for "
+ "persistence type: " + persistenceType
+". Instead created FileStrategyBuilder....");
}
builder.setPassedInPersistenceType(passedInPersistenceType);
return builder;
}
/**
* returns an appropriately camel-cased String
* that is a candidate class name for a builder
* if persistenceType is "file" this returns
* the correct class name and package name for these classes
* i.e. com.sun.ejb.spi.??
* FIXME:figure this out where the file builder
* will reside
* otherwise they are in com.sun.appserv.ee.web.initialization
*
* @param persistenceType
*/
private String createClassNameFrom(String persistenceType) {
StringBuffer sb = new StringBuffer();
//using package name will mean this will work
//even if class is moved to another package
String pkg = this.getClass().getPackage().getName();
if( !(persistenceType.equalsIgnoreCase("file")) )
{
//pkg is the package where EE builders MUST reside
//this defaults to
//"com.sun.enterprise.ee.web.initialization"
// but is configurable via (not-well-publicized)
//property in server.xml
//at "/server/availability-service/persistence-store/property[@name='ee-builder-path']"
pkg = this.getEEBuilderPath();
}
sb.append(pkg + ".");
sb.append(camelCase(persistenceType));
sb.append("StrategyBuilder");
String classname = sb.toString();
return classname;
}
/**
* this method strips out all non-alpha characters; camelCases the result
*
* @param inputString
*/
private String camelCase(String inputString) {
String strippedString = stripNonAlphas(inputString);
String firstLetter = (strippedString.substring(0, 1)).toUpperCase();
String remainingPart =
(strippedString.substring(1, strippedString.length())).toLowerCase();
return firstLetter + remainingPart;
}
/**
* this method strips out all non-alpha characters
*
* @param inputString
*/
private String stripNonAlphas(String inputString) {
StringBuffer sb = new StringBuffer(50);
for(int i=0; i<inputString.length(); i++) {
char nextChar = inputString.charAt(i);
if(Character.isLetter(nextChar)) {
sb.append(nextChar);
}
}
return sb.toString();
}
/**
* return the path where the ee builders reside
* although this method allows this to be configurable
* via an property in server.xml we do not expose it
* and it should not be re-configured
*
*/
private String getEEBuilderPath() {
return DEFAULT_EE_BUILDER_PATH;
}
private PersistenceTypeResolver getPersistenceTypeResolver() {
String resolverClassName
= "com.sun.enterprise.ee.web.sessmgmt.EEPersistenceTypeResolver";
PersistenceTypeResolver persistenceTypeResolver = null;
try {
persistenceTypeResolver =
(PersistenceTypeResolver) (Class.forName(resolverClassName)).newInstance();
} catch (Exception ex) {
debug("unable to create persistence type resolver");
}
return persistenceTypeResolver;
}
/**
* The logger to use for logging ALL ejb container related messages.
*/
private static final Logger _logger =
LogDomains.getLogger(LogDomains.EJB_LOGGER);;
}
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