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Micro Distribution of the Payara Project for IBM JDK
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package com.sun.appserv.connectors.internal.api;
import org.glassfish.internal.api.*;
import org.jvnet.hk2.annotations.Service;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.*;
import java.util.logging.Logger;
import java.util.logging.Level;
import com.sun.logging.LogDomains;
import javax.inject.Inject;
import javax.inject.Provider;
/**
* We support two policies:
* 1. All standalone RARs are available to all other applications. This is the
* Java EE 5 specific behavior.
* 2. An application has visbility to only those standalone RARs that it
* depends on. This is the new behavior defined in Java EE 6 as well as
* JCA 1.6 spec.
*
* @author [email protected]
*/
@Service
public class ConnectorClassLoaderServiceImpl implements ConnectorClassLoaderService {
/**
* This class loader is used when we have just a single connector
* class loader for all applications. In other words, we make every
* standalone RARs available to all applications.
*/
private volatile DelegatingClassLoader globalConnectorCL;
@Inject
private AppSpecificConnectorClassLoaderUtil appsSpecificCCLUtil;
@Inject
private Provider classLoaderHierarchyProvider;
private Logger logger = LogDomains.getLogger(ConnectorClassLoaderServiceImpl.class, LogDomains.RSR_LOGGER);
/**
* provides connector-class-loader for the specified application
* If application is null, global connector class loader will be provided
* @param appName application-name
* @return class-loader
*/
public DelegatingClassLoader getConnectorClassLoader(String appName) {
DelegatingClassLoader loader = null;
// We do not have dependency on common-class-loader explicitly
// and also cannot initialize globalConnectorCL during postConstruct via ClassLoaderHierarchy
// which will result in circular dependency injection between kernel and connector module
// Hence initializing globalConnectorCL lazily
if (globalConnectorCL == null) {
synchronized (ConnectorClassLoaderServiceImpl.class) {
if (globalConnectorCL == null) {
//[parent is assumed to be common-class-loader in ConnectorClassLoaderUtil.createRARClassLoader() also]
final ClassLoader parent = getCommonClassLoader();
globalConnectorCL = AccessController.doPrivileged(new PrivilegedAction() {
public DelegatingClassLoader run() {
DelegatingClassLoader dcl = new DelegatingClassLoader(parent);
for (DelegatingClassLoader.ClassFinder cf : appsSpecificCCLUtil.getSystemRARClassLoaders()) {
dcl.addDelegate(cf);
}
return dcl;
}
});
for (DelegatingClassLoader.ClassFinder cf : appsSpecificCCLUtil.getSystemRARClassLoaders()) {
globalConnectorCL.addDelegate(cf);
}
}
}
}
if (hasGlobalAccessForRARs(appName)) {
assert (globalConnectorCL != null);
loader = globalConnectorCL;
} else {
appsSpecificCCLUtil.detectReferredRARs(appName);
loader = createConnectorClassLoaderForApplication(appName);
}
return loader;
}
private boolean hasGlobalAccessForRARs(String appName) {
return appName == null || appsSpecificCCLUtil.useGlobalConnectorClassLoader() ||
appsSpecificCCLUtil.getRequiredResourceAdapters(appName).contains
(ConnectorConstants.RAR_VISIBILITY_GLOBAL_ACCESS);
}
private ClassLoader getCommonClassLoader(){
return classLoaderHierarchyProvider.get().getCommonClassLoader();
}
private DelegatingClassLoader createConnectorClassLoaderForApplication(String appName){
DelegatingClassLoader appSpecificConnectorClassLoader =
new DelegatingClassLoader(getCommonClassLoader());
//add system ra classloaders
for(DelegatingClassLoader.ClassFinder cf : appsSpecificCCLUtil.getSystemRARClassLoaders()){
appSpecificConnectorClassLoader.addDelegate(cf);
}
for(String raName : appsSpecificCCLUtil.getRARsReferredByApplication(appName)){
addRarClassLoader(appName, appSpecificConnectorClassLoader, raName);
}
for(String raName : appsSpecificCCLUtil.getRequiredResourceAdapters(appName)){
addRarClassLoader(appName, appSpecificConnectorClassLoader, raName);
}
return appSpecificConnectorClassLoader;
}
private void addRarClassLoader(String appName, DelegatingClassLoader appSpecificConnectorClassLoader,
String raName) {
if(logger.isLoggable(Level.FINEST)){
logger.finest("raName for app [ "+appName+" ] : " + raName);
}
DelegatingClassLoader.ClassFinder cf = getClassFinder(raName);
if(cf != null){
appSpecificConnectorClassLoader.addDelegate(cf);
}else{
//not possible
/* TODO V3
if(!ConnectorsUtil.isEmbedded(appName, raName)){
throw new IllegalStateException("RAR Classloader of RAR [ "+raName+" ] not found for " +
"application [ "+appName+" ]");
}
*/
}
}
private DelegatingClassLoader.ClassFinder getClassFinder(String raName) {
List delegates = globalConnectorCL.getDelegates();
DelegatingClassLoader.ClassFinder classFinder = null;
for(DelegatingClassLoader.ClassFinder cf : delegates){
if(raName.equals(((ConnectorClassFinder)cf).getResourceAdapterName())){
classFinder = cf;
break;
}
}
return classFinder;
}
}
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