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package com.sun.jdo.spi.persistence.support.sqlstore.model;
import com.sun.jdo.spi.persistence.support.sqlstore.ConfigCache;
import com.sun.jdo.spi.persistence.support.sqlstore.PersistenceConfig;
import com.sun.jdo.spi.persistence.support.sqlstore.VersionConsistencyCache;
import com.sun.jdo.spi.persistence.support.sqlstore.ejb.ApplicationLifeCycleEventListener;
import com.sun.jdo.spi.persistence.support.sqlstore.ejb.EJBHelper;
import com.sun.jdo.spi.persistence.support.sqlstore.query.util.type.TypeTable;
import com.sun.jdo.api.persistence.model.Model;
import java.util.*;
/**
* Caches SQLStore config information.
*
* @author Mitesh Meswani
*/
public class ConfigCacheImpl
implements ConfigCache, ApplicationLifeCycleEventListener {
/**
* Map of class types to PersistenceConfig.
*/
private Map classConfigs;
/**
* Map of OID classes to PersistenceCapable classes.
*/
private Map oidClassToClassType;
/**
* This cache should be notified every time a VC class
* is loaded or unloaded.
*/
private VersionConsistencyCache vcCache;
/**
* Map of class loaders to a list of PersistenceCapable
* classes loaded by the classloader.
*/
private Map classLoaderToClassType;
public ConfigCacheImpl() {
classConfigs = new HashMap();
classLoaderToClassType = new HashMap();
oidClassToClassType = new HashMap();
// Register for call backs on application loader events.
EJBHelper.registerApplicationLifeCycleEventListener(this);
}
/**
* Get the PersistenceConfig for given pcClass. The config is looked up
* from a cache. If a config can not be found in cache, a new
* instance is created and returned.
*
* @param pcClass The input pcClass.
* @return PersistenceConfig for given pcClass.
*/
public synchronized PersistenceConfig getPersistenceConfig(Class pcClass) {
ClassDesc sqlConfig =
(ClassDesc) classConfigs.get(pcClass);
if (sqlConfig == null) {
// The order of the below operations is important.
// Initialize is called after puting sqlConfig into the
// cache so that ClassDesc#fixupForeignReferences does not
// cause infinite recursion.
// After the initialisation, oidClassToClassType.put is
// called so that sqlConfig.getOidClass() returns correct
// value.
sqlConfig = ClassDesc.newInstance(pcClass);
classConfigs.put(pcClass, sqlConfig);
sqlConfig.initialize(this);
oidClassToClassType.put(sqlConfig.getOidClass(), pcClass);
addToClassLoaderMap(pcClass);
}
return sqlConfig;
}
/**
* Gets the Class instance corresponding to given oidType.
*
* @param oidType The input oidType.
* @return The Class instance corresponding to given oidType.
*/
public Class getClassByOidClass(Class oidType) {
return (Class) oidClassToClassType.get(oidType);
}
/**
* @inheritDoc
*/
public void notifyApplicationUnloaded(ClassLoader classLoader) {
// Clean up classConfigs and oidClassToClassType for the given
// classLoader.
synchronized (this) {
List pcClasses = (List) classLoaderToClassType.get(classLoader);
if (pcClasses != null) {
Iterator it = pcClasses.iterator();
while (it.hasNext()) {
Class classType = (Class) it.next();
ClassDesc config =
(ClassDesc) classConfigs.remove(classType);
Class oidClass = config.getOidClass();
oidClassToClassType.remove(oidClass);
if (config.hasVersionConsistency() && vcCache != null) {
vcCache.removePCType(classType);
}
}
// Data about this classLoader is no longer needed.
// Remove it from cache.
classLoaderToClassType.remove(classLoader);
}
}
// Notify others to cleanup
TypeTable.removeInstance(classLoader);
Model model = Model.RUNTIME;
model.removeResourcesFromCaches(classLoader);
}
/**
* Sets VersionConsistencyCache field.
*
* @param vcCache the VersionConsistencyCache instance.
*/
public synchronized void setVersionConsistencyCache(
VersionConsistencyCache vcCache) {
this.vcCache = vcCache;
}
/**
* Add pcClass to a classLoaderToClassType map. The only call to
* this private method is from getPersistenceConfig(). As that method is
* synchronized we don't need to synchronize here.
*
* @param pcClass The pcClass to be added.
*/
private void addToClassLoaderMap(Class pcClass) {
ClassLoader classLoader = pcClass.getClassLoader();
List classes = (List) classLoaderToClassType.get(classLoader);
if (classes == null) {
// First entry for a given ClassLoader, initialize the ArrayList.
classes = new ArrayList();
classLoaderToClassType.put(classLoader, classes);
}
classes.add(pcClass);
}
}