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package oracle.toplink.essentials.internal.sessions;
import java.util.*;
import oracle.toplink.essentials.internal.identitymaps.*;
import oracle.toplink.essentials.queryframework.*;
import oracle.toplink.essentials.expressions.*;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
import oracle.toplink.essentials.descriptors.ClassDescriptor;
import oracle.toplink.essentials.sessions.Record;
import oracle.toplink.essentials.logging.SessionLog;
import oracle.toplink.essentials.internal.helper.WriteLockManager;
import oracle.toplink.essentials.internal.queryframework.JoinedAttributeManager;
/**
* INTERNAL:
* Internal subclass that provides access to identity maps through the session.
* Implements the IdentityMapAccessor interface which provides all publicly available
* identity map functionality to users.
* This is the main class that should be used to access identity maps. In general, any
* function that accesses the identity map manager should go through this class
* Any session specific functionality appears in subclasses
*/
public class IsolatedClientSessionIdentityMapAccessor extends oracle.toplink.essentials.internal.sessions.IdentityMapAccessor {
/**
* INTERNAL:
* An IdentityMapAccessor sits between the session and the identityMapManager
* It needs references in both directions
*/
public IsolatedClientSessionIdentityMapAccessor(AbstractSession session, IdentityMapManager identityMapManager) {
super(session, identityMapManager);
}
/**
* INTERNAL:
* Deferred lock the identity map for the object, this is used for avoiding deadlock
* The return cacheKey should be used to release the deferred lock
*/
public CacheKey acquireDeferredLock(Vector primaryKey, Class javaClass, ClassDescriptor descriptor) {
if (descriptor.isIsolated()) {
return getIdentityMapManager().acquireDeferredLock(primaryKey, javaClass, descriptor);
} else {
return ((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().acquireDeferredLock(primaryKey, javaClass, descriptor);
}
}
/**
* INTERNAL:
* Provides access for setting a concurrency lock on an object in the IdentityMap.
* called with true from the merge process, if true then the refresh will not refresh the object
* @see IdentityMap#aquire
*/
public CacheKey acquireLock(Vector primaryKey, Class domainClass, boolean forMerge, ClassDescriptor descriptor) {
if (descriptor.isIsolated()) {
return getIdentityMapManager().acquireLock(primaryKey, domainClass, forMerge, descriptor);
} else {
return ((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().acquireLock(primaryKey, domainClass, forMerge, descriptor);
}
}
/**
* INTERNAL:
* Provides access for setting a concurrency lock on an object in the IdentityMap.
* called with true from the merge process, if true then the refresh will not refresh the object
* @see IdentityMap#aquire
*/
public CacheKey acquireLockNoWait(Vector primaryKey, Class domainClass, boolean forMerge, ClassDescriptor descriptor) {
if (descriptor.isIsolated()) {
return getIdentityMapManager().acquireLockNoWait(primaryKey, domainClass, forMerge, descriptor);
} else {
return ((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().acquireLockNoWait(primaryKey, domainClass, forMerge, descriptor);
}
}
/**
* INTERNAL:
* Find the cachekey for the provided primary key and place a readlock on it.
* This will allow multiple users to read the same object but prevent writes to
* the object while the read lock is held.
*/
public CacheKey acquireReadLockOnCacheKey(Vector primaryKey, Class domainClass, ClassDescriptor descriptor) {
if (descriptor.isIsolated()) {
return getIdentityMapManager().acquireReadLockOnCacheKey(primaryKey, domainClass, descriptor);
} else {
return ((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().acquireReadLockOnCacheKey(primaryKey, domainClass, descriptor);
}
}
/**
* INTERNAL:
* Find the cachekey for the provided primary key and place a readlock on it.
* This will allow multiple users to read the same object but prevent writes to
* the object while the read lock is held.
* If no readlock can be acquired then do not wait but return null.
*/
public CacheKey acquireReadLockOnCacheKeyNoWait(Vector primaryKey, Class domainClass, ClassDescriptor descriptor) {
if (descriptor.isIsolated()) {
return getIdentityMapManager().acquireReadLockOnCacheKeyNoWait(primaryKey, domainClass, descriptor);
} else {
return ((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().acquireReadLockOnCacheKeyNoWait(primaryKey, domainClass, descriptor);
}
}
/**
* INTERNAL:
* Lock the entire cache if the cache isolation requires.
* By default concurrent reads and writes are allowed.
* By write, unit of work merge is meant.
*/
public boolean acquireWriteLock() {
getIdentityMapManager().acquireWriteLock();
// must lock the parents cache as well.
return ((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().acquireWriteLock();
}
/**
* INTERNAL:
* Return whether the identity maps contain an item of the given class and key
*/
public boolean containsKey(Vector key, Class theClass, ClassDescriptor descriptor) {
if (descriptor.isIsolated()) {
return getIdentityMapManager().containsKey(key, theClass, descriptor);
} else {
return ((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().containsKey(key, theClass, descriptor);
}
}
/**
* ADVANCED:
* Return if their is an object for the primary key.
*/
public boolean containsObjectInIdentityMap(Vector primaryKey, Class theClass, ClassDescriptor descriptor) {
if (descriptor.isIsolated()) {
return getIdentityMapManager().containsKey(primaryKey, theClass, descriptor);
} else {
return ((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().containsObjectInIdentityMap(primaryKey, theClass, descriptor);
}
}
/**
* INTERNAL:
* This method is used to get a list of those classes with IdentityMaps in the Session.
*/
public Vector getClassesRegistered() {
Vector results = getIdentityMapManager().getClassesRegistered();
results.addAll(((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().getClassesRegistered());
return results;
}
/**
* ADVANCED:
* Query the cache in-memory.
* If the expression is too complex an exception will be thrown.
* Only return objects that are invalid in the cache if specified.
*/
public Vector getAllFromIdentityMap(Expression selectionCriteria, Class theClass, Record translationRow, InMemoryQueryIndirectionPolicy valueHolderPolicy, boolean shouldReturnInvalidatedObjects) throws QueryException {
if (session.getDescriptor(theClass).isIsolated()) {
return getIdentityMapManager().getAllFromIdentityMap(selectionCriteria, theClass, translationRow, valueHolderPolicy, shouldReturnInvalidatedObjects);
} else {
return ((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().getAllFromIdentityMap(selectionCriteria, theClass, translationRow, valueHolderPolicy, shouldReturnInvalidatedObjects);
}
}
/**
* INTERNAL:
* Retrieve the cache key for the given identity information
* @param Vector the primary key of the cache key to be retrieved
* @param Class the class of the cache key to be retrieved
* @return CacheKey
*/
public CacheKey getCacheKeyForObject(Vector primaryKey, Class myClass, ClassDescriptor descriptor) {
if (descriptor.isIsolated()) {
return getIdentityMapManager().getCacheKeyForObject(primaryKey, myClass, descriptor);
} else {
return ((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().getCacheKeyForObject(primaryKey, myClass, descriptor);
}
}
/**
* ADVANCED:
* Return the object from the identity with the primary and class.
*/
public Object getFromIdentityMap(Vector primaryKey, Class theClass, ClassDescriptor descriptor, JoinedAttributeManager joinedAttributeManager) {
if (descriptor.isIsolated()) {
return getIdentityMapManager().getFromIdentityMap(primaryKey, theClass, descriptor);
} else {
return ((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().getFromIdentityMap(primaryKey, theClass, descriptor, joinedAttributeManager);
}
}
/**
* INTERNAL:
* Query the cache in-memory.
* If the object is not found null is returned.
* If the expression is too complex an exception will be thrown.
*/
public Object getFromIdentityMap(Expression selectionCriteria, Class theClass, Record translationRow, InMemoryQueryIndirectionPolicy valueHolderPolicy, boolean conforming, boolean shouldReturnInvalidatedObjects, ClassDescriptor descriptor) {
if (descriptor.isIsolated()) {
return getIdentityMapManager().getFromIdentityMap(selectionCriteria, theClass, translationRow, valueHolderPolicy, conforming, shouldReturnInvalidatedObjects, descriptor);
} else {
return ((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().getFromIdentityMap(selectionCriteria, theClass, translationRow, valueHolderPolicy, conforming, shouldReturnInvalidatedObjects, descriptor);
}
}
/**
* INTERNAL:
* Return the object from the identity with the primary and class.
* Only return invalidated objects if requested
*/
public Object getFromIdentityMapWithDeferredLock(Vector primaryKey, Class theClass, boolean shouldReturnInvalidatedObjects, ClassDescriptor descriptor) {
if (descriptor.isIsolated()) {
return getIdentityMapManager().getFromIdentityMapWithDeferredLock(primaryKey, theClass, shouldReturnInvalidatedObjects, descriptor);
} else {
return ((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().getFromIdentityMapWithDeferredLock(primaryKey, theClass, shouldReturnInvalidatedObjects, descriptor);
}
}
/**
* INTERNAL:
* Get the IdentityMapManager for this IdentityMapAccessor
* This method should be used for all IdentityMapManager access since it may
* be overridden in sub classes.
*/
public IdentityMapManager getIdentityMapManager() {
return identityMapManager;
}
/**
* INTERNAL:
* Get the identity map for the given class from the IdentityMapManager
*/
public IdentityMap getIdentityMap(ClassDescriptor descriptor) {
if (descriptor.isIsolated()) {
return getIdentityMapManager().getIdentityMap(descriptor);
} else {
return ((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().getIdentityMap(descriptor);
}
}
/**
* ADVANCED:
* Return the remaining life of this object. This method is associated with use of
* TopLink's cache invalidation feature and returns the difference between the next expiry
* time of the object and its read time. The method will return 0 for invalidated objects.
*/
public long getRemainingValidTime(Object object) {
ClassDescriptor descriptor = getSession().getDescriptor(object);
CacheKey key = this.getCacheKeyForObject(object, descriptor);
if (key == null) {
throw QueryException.objectDoesNotExistInCache(object);
}
return descriptor.getCacheInvalidationPolicy().getRemainingValidTime(key);
}
/**
* INTERNAL:
* get the session associated with this IdentityMapAccessor
*/
public AbstractSession getSession() {
return session;
}
/**
* INTERNAL:
* Get the wrapper object from the cache key associated with the given primary key,
* this is used for EJB.
*/
public Object getWrapper(Vector primaryKey, Class theClass) {
if (session.getDescriptor(theClass).isIsolated()) {
return getIdentityMapManager().getWrapper(primaryKey, theClass);
} else {
return ((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().getWrapper(primaryKey, theClass);
}
}
/**
* INTERNAL:
* Returns the single write Lock manager for this session
*/
public WriteLockManager getWriteLockManager() {
// As there should only be one write lock manager per server session
// get the one from the parent.
return ((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().getWriteLockManager();
}
/**
* ADVANCED:
* Extract the write lock value from the identity map.
*/
public Object getWriteLockValue(Vector primaryKey, Class theClass, ClassDescriptor descriptor) {
if (descriptor.isIsolated()) {
return getIdentityMapManager().getWriteLockValue(primaryKey, theClass, descriptor);
} else {
return ((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().getWriteLockValue(primaryKey, theClass, descriptor);
}
}
/**
* PUBLIC:
* Reset the entire object cache.
* <p> NOTE: be careful using this method. This method blows away both this session's and its parents caches,
* this includes the server cache or any other cache. This throws away any objects that have been read in.
* Extream caution should be used before doing this because object identity will no longer
* be maintained for any objects currently read in. This should only be called
* if the application knows that it no longer has references to object held in the cache.
*/
public void initializeAllIdentityMaps() {
getSession().log(SessionLog.FINER, SessionLog.CACHE, "initialize_all_local_identitymaps");
getIdentityMapManager().initializeIdentityMaps();
((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().initializeIdentityMaps();
}
/**
* PUBLIC:
* Reset the identity map for only the instances of the class.
* For inheritance the user must make sure that they only use the root class.
* Caution must be used in doing this to ensure that the objects within the identity map
* are not referenced from other objects of other classes or from the application.
*/
public void initializeIdentityMap(Class theClass) {
getSession().log(SessionLog.FINER, SessionLog.CACHE, "initialize_identitymap", theClass);
if (session.getDescriptor(theClass).isIsolated()) {
getIdentityMapManager().initializeIdentityMap(theClass);
} else {
((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().initializeIdentityMap(theClass);
}
}
/**
* PUBLIC:
* Reset the entire local object cache.
* This throws away any objects that have been read in.
* Extream caution should be used before doing this because object identity will no longer
* be maintained for any objects currently read in. This should only be called
* if the application knows that it no longer has references to object held in the cache.
*/
public void initializeIdentityMaps() {
getSession().log(SessionLog.FINER, SessionLog.CACHE, "initialize_identitymaps");
getIdentityMapManager().initializeIdentityMaps();
getSession().getCommitManager().reinitialize();
}
/**
* PUBLIC:
* Used to print all the objects in the identity map of the passed in class.
* The output of this method will be logged to this session's SessionLog at SEVERE level.
*/
public void printIdentityMap(Class businessClass) {
if (getSession().shouldLog(SessionLog.SEVERE, SessionLog.CACHE)) {
if (session.getDescriptor(businessClass).isIsolated()) {
getIdentityMapManager().printIdentityMap(businessClass);
} else {
((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().printIdentityMap(businessClass);
}
}
}
/**
* PUBLIC:
* Used to print all the objects in every identity map in this session.
* The output of this method will be logged to this session's SessionLog at SEVERE level.
*/
public void printIdentityMaps() {
if (getSession().shouldLog(SessionLog.SEVERE, SessionLog.CACHE)) {
getIdentityMapManager().printIdentityMaps();
((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().printIdentityMaps();
}
}
/**
* PUBLIC:
* Used to print all the locks in every identity map in this session.
* The output of this method will be logged to this session's SessionLog at FINEST level.
*/
public void printIdentityMapLocks() {
if (getSession().shouldLog(SessionLog.FINEST, SessionLog.CACHE)) {
getIdentityMapManager().printLocks();
((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().printIdentityMapLocks();
}
}
/**
* ADVANCED:
* Register the object with the identity map.
* The object must always be registered with its version number if optimistic locking is used.
* The readTime may also be included in the cache key as it is constructed.
*/
public CacheKey internalPutInIdentityMap(Object domainObject, Vector key, Object writeLockValue, long readTime, ClassDescriptor descriptor) {
//no need to unwrap as the put will unwrap later anyway
if (descriptor.isIsolated()) {
return getIdentityMapManager().putInIdentityMap(domainObject, key, writeLockValue, readTime, descriptor);
} else {
return ((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().internalPutInIdentityMap(domainObject, key, writeLockValue, readTime, descriptor);
}
}
/**
* INTERNAL:
* Lock the entire cache if the cache isolation requires.
* By default concurrent reads and writes are allowed.
* By write, unit of work merge is meant.
*/
public void releaseWriteLock() {
//release in the oposite order of the acquire
((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().releaseWriteLock();
getIdentityMapManager().releaseWriteLock();
}
/**
* ADVANCED:
* Remove the object from the object cache.
*/
public Object removeFromIdentityMap(Vector key, Class theClass, ClassDescriptor descriptor) {
if (descriptor.isIsolated()) {
return getIdentityMapManager().removeFromIdentityMap(key, theClass, descriptor);
} else {
return ((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().removeFromIdentityMap(key, theClass, descriptor);
}
}
/**
* INTERNAL:
* Set the IdentityMapManager for this IdentityMapAccessor
*/
public void setIdentityMapManager(IdentityMapManager identityMapManager) {
this.identityMapManager = identityMapManager;
}
/**
* INTERNAL:
* Update the wrapper object the cache key associated with the given primary key,
* this is used for EJB.
*/
public void setWrapper(Vector primaryKey, Class theClass, Object wrapper) {
if (getSession().getDescriptor(theClass).isIsolated()) {
getIdentityMapManager().setWrapper(primaryKey, theClass, wrapper);
} else {
((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().setWrapper(primaryKey, theClass, wrapper);
}
}
/**
* ADVANCED:
* Update the write lock value in the identity map.
*/
public void updateWriteLockValue(Vector primaryKey, Class theClass, Object writeLockValue) {
if (getSession().getDescriptor(theClass).isIsolated()) {
getIdentityMapManager().setWriteLockValue(primaryKey, theClass, writeLockValue);
} else {
((IsolatedClientSession)session).getParent().getIdentityMapAccessorInstance().updateWriteLockValue(primaryKey, theClass, writeLockValue);
}
}
}
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