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/*
* Copyright (c) 1998, 2021 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Oracle - initial API and implementation from Oracle TopLink
// 31/05/2010-2.1 Michael O'Brien
// - 312503: invalidateClass(Class, recurseFlag) - when recurseFlag=false
// (non-default) will now invalidate the implementing subtree
// from [Class] down. Previously only the single Class inside the tree was invalidated.
package org.eclipse.persistence.internal.sessions;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Vector;
import org.eclipse.persistence.descriptors.CacheIndex;
import org.eclipse.persistence.descriptors.ClassDescriptor;
import org.eclipse.persistence.exceptions.QueryException;
import org.eclipse.persistence.exceptions.ValidationException;
import org.eclipse.persistence.expressions.Expression;
import org.eclipse.persistence.internal.descriptors.DescriptorIterator;
import org.eclipse.persistence.internal.helper.WriteLockManager;
import org.eclipse.persistence.internal.identitymaps.CacheId;
import org.eclipse.persistence.internal.identitymaps.CacheKey;
import org.eclipse.persistence.internal.identitymaps.IdentityMap;
import org.eclipse.persistence.internal.identitymaps.IdentityMapManager;
import org.eclipse.persistence.logging.SessionLog;
import org.eclipse.persistence.queries.InMemoryQueryIndirectionPolicy;
import org.eclipse.persistence.queries.ReadQuery;
import org.eclipse.persistence.sessions.DataRecord;
import org.eclipse.persistence.sessions.DatabaseRecord;
import org.eclipse.persistence.sessions.coordination.CommandManager;
import org.eclipse.persistence.sessions.coordination.MergeChangeSetCommand;
/**
* 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 IdentityMapAccessor implements org.eclipse.persistence.sessions.IdentityMapAccessor, java.io.Serializable {
/** This is the identity map manager for this accessor. It should only be accessed through the getter **/
protected IdentityMapManager identityMapManager = null;
protected AbstractSession session = null;
/**
* INTERNAL:
*/
public IdentityMapAccessor() {
}
/**
* INTERNAL:
* An IdentityMapAccessor sits between the session and the identityMapManager
* It needs references in both directions.
*/
public IdentityMapAccessor(AbstractSession session) {
this.session = session;
}
/**
* INTERNAL:
* An IdentityMapAccessor sits between the session and the identityMapManager
* It needs references in both directions.
*/
public IdentityMapAccessor(AbstractSession session, IdentityMapManager identityMapManager) {
this.session = session;
this.identityMapManager = 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(Object primarKey, Class javaClass, ClassDescriptor descriptor, boolean isCacheCheckComplete) {
return getIdentityMapManager().acquireDeferredLock(primarKey, javaClass, descriptor, isCacheCheckComplete);
}
/**
* INTERNAL:
* Lock the identity map for the object, this must be done when building objects.
* The return cacheKey should be used to release the lock.
*/
public CacheKey acquireLock(Object primarKey, Class javaClass, ClassDescriptor descriptor, boolean isCacheCheckComplete) {
return acquireLock(primarKey, javaClass, false, descriptor, isCacheCheckComplete);
}
/**
* 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.
*/
public CacheKey acquireLock(Object primaryKey, Class domainClass, boolean forMerge, ClassDescriptor descriptor, boolean isCacheCheckComplete) {
return getIdentityMapManager().acquireLock(primaryKey, domainClass, forMerge, descriptor, isCacheCheckComplete);
}
/**
* 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.
*/
public CacheKey acquireLockNoWait(Object primaryKey, Class domainClass, boolean forMerge, ClassDescriptor descriptor) {
return getIdentityMapManager().acquireLockNoWait(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.
*/
public CacheKey acquireLockWithWait(Object primaryKey, Class domainClass, boolean forMerge, ClassDescriptor descriptor, int wait) {
return getIdentityMapManager().acquireLockWithWait(primaryKey, domainClass, forMerge, descriptor, wait);
}
/**
* 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(Object primaryKey, Class domainClass, ClassDescriptor descriptor) {
return getIdentityMapManager().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(Object primaryKey, Class domainClass, ClassDescriptor descriptor) {
return getIdentityMapManager().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() {
return getIdentityMapManager().acquireWriteLock();
}
/**
* ADVANCED:
* Clear all the query caches
*/
@Override
public void clearQueryCache() {
getIdentityMapManager().clearQueryCache();
}
/**
* ADVANCED:
* Clear the query class associated with the passed-in read query
*/
@Override
public void clearQueryCache(ReadQuery query) {
getIdentityMapManager().clearQueryCache(query);
}
/**
* ADVANCED:
* Clear the query cache associated with the named query on the session
*/
@Override
public void clearQueryCache(String sessionQueryName) {
getIdentityMapManager().clearQueryCache((ReadQuery)session.getQuery(sessionQueryName));
}
/**
* ADVANCED:
* Clear the query cache associated with the named query on the descriptor for the given class
*/
@Override
public void clearQueryCache(String descriptorQueryName, Class queryClass) {
getIdentityMapManager().clearQueryCache((ReadQuery)session.getDescriptor(queryClass).getQueryManager().getQuery(descriptorQueryName));
}
/**
* ADVANCED:
* Return if their is an object for the primary key.
*/
@Override
public boolean containsObjectInIdentityMap(Object object) {
return containsObjectInIdentityMap(getSession().getId(object), object.getClass());
}
/**
* ADVANCED:
* Return if their is an object for the primary key.
*/
@Override
public boolean containsObjectInIdentityMap(Object primaryKey, Class theClass) {
ClassDescriptor descriptor = getSession().getDescriptor(theClass);
return containsObjectInIdentityMap(primaryKey, theClass, descriptor);
}
/**
* INTERNAL:
* Return if their is an object for the primary key.
*/
public boolean containsObjectInIdentityMap(Object primaryKey, Class theClass, ClassDescriptor descriptor) {
return getIdentityMapManager().containsKey(primaryKey, theClass, descriptor);
}
/**
* ADVANCED:
* Return if their is an object for the row containing primary key and the class.
*/
@Override
public boolean containsObjectInIdentityMap(DataRecord rowContainingPrimaryKey, Class theClass) {
return containsObjectInIdentityMap(extractPrimaryKeyFromRow(rowContainingPrimaryKey, theClass), theClass);
}
/**
* INTERNAL:
* Extract primary key from a row.
*/
protected Object extractPrimaryKeyFromRow(DataRecord rowContainingPrimaryKey, Class theClass) {
return this.session.getDescriptor(theClass).getObjectBuilder().extractPrimaryKeyFromRow((AbstractRecord)rowContainingPrimaryKey, this.session);
}
/**
* INTERNAL:
* Retrieve the cache key for the given object from the identity maps.
* @param object the object to get the cache key for.
*/
public CacheKey getCacheKeyForObject(Object object, ClassDescriptor descriptor) {
return getCacheKeyForObject(getSession().keyFromObject(object, descriptor), object.getClass(), descriptor, false);
}
/**
* INTERNAL:
* This method is used to get a list of those classes with IdentityMaps in the Session.
*/
public Vector getClassesRegistered() {
return getIdentityMapManager().getClassesRegistered();
}
/**
* ADVANCED:
* Query the cache in-memory.
* If the expression is too complex an exception will be thrown.
*/
public Vector getAllFromIdentityMap(Expression selectionCriteria, Class theClass, DataRecord translationRow) throws QueryException {
return getAllFromIdentityMap(selectionCriteria, theClass, translationRow, InMemoryQueryIndirectionPolicy.SHOULD_THROW_INDIRECTION_EXCEPTION, true);
}
/**
* ADVANCED:
* Query the cache in-memory.
* If the expression is too complex an exception will be thrown.
*/
@Override
public Vector getAllFromIdentityMap(Expression selectionCriteria, Class theClass, DataRecord translationRow, InMemoryQueryIndirectionPolicy valueHolderPolicy) throws QueryException {
return getAllFromIdentityMap(selectionCriteria, theClass, translationRow, valueHolderPolicy, true);
}
/**
* ADVANCED:
* Query the cache in-memory.
* If the expression is too complex an exception will be thrown.
*/
@Override
public Vector getAllFromIdentityMap(Expression selectionCriteria, Class theClass, DataRecord translationRow, int valueHolderPolicy) throws QueryException {
return getAllFromIdentityMap(selectionCriteria, theClass, translationRow, valueHolderPolicy, true);
}
/**
* 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.
*/
@Override
public Vector getAllFromIdentityMap(Expression selectionCriteria, Class theClass, DataRecord translationRow, InMemoryQueryIndirectionPolicy valueHolderPolicy, boolean shouldReturnInvalidatedObjects) throws QueryException {
int policy = 0;
if (valueHolderPolicy != null) {
policy = valueHolderPolicy.getPolicy();
}
return getAllFromIdentityMap(selectionCriteria, theClass, translationRow, policy, shouldReturnInvalidatedObjects);
}
/**
* 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.
*/
@Override
public Vector getAllFromIdentityMap(Expression selectionCriteria, Class theClass, DataRecord translationRow, int valueHolderPolicy, boolean shouldReturnInvalidatedObjects) throws QueryException {
return getIdentityMapManager().getAllFromIdentityMap(selectionCriteria, theClass, translationRow, valueHolderPolicy, shouldReturnInvalidatedObjects);
}
/**
* ADVANCED:
* Using a list of Entity PK this method will attempt to bulk load the entire list from the cache.
* In certain circumstances this can have large performance improvements over loading each item individually.
* @param pkList List of Entity PKs to extract from the cache
* @param descriptor Descriptor type to be retrieved.
* @return Map of Entity PKs associated to the Entities that were retrieved
*/
public Map getAllFromIdentityMapWithEntityPK(Object[] pkList, ClassDescriptor descriptor){
return getIdentityMapManager().getAllFromIdentityMapWithEntityPK(pkList, descriptor, getSession());
}
/**
* ADVANCED:
* Using a list of Entity PK this method will attempt to bulk load the entire list from the cache.
* In certain circumstances this can have large performance improvements over loading each item individually.
* @param pkList List of Entity PKs to extract from the cache
* @param descriptor Descriptor type to be retrieved.
* @return Map of Entity PKs associated to the Entities that were retrieved
*/
public Map getAllCacheKeysFromIdentityMapWithEntityPK(Object[] pkList, ClassDescriptor descriptor){
return getIdentityMapManager().getAllCacheKeysFromIdentityMapWithEntityPK(pkList, descriptor, getSession());
}
/**
* ADVANCED:
* Return the object from the identity with primary and class of the given object.
*/
@Override
public Object getFromIdentityMap(Object object) {
return getFromIdentityMap(getSession().getId(object), object.getClass());
}
/**
* INTERNAL:
* Retrieve the cache key for the given object.
* @return CacheKey
*/
public CacheKey getCacheKeyForObject(Object object) {
return getCacheKeyForObject(getSession().getId(object), object.getClass(), getSession().getDescriptor(object.getClass()), false);
}
/**
* INTERNAL:
* Retrieve the cache key for the given identity information.
* @param primaryKey the primary key of the cache key to be retrieved.
* @param myClass the class of the cache key to be retrieved.
*/
public CacheKey getCacheKeyForObjectForLock(Object primaryKey, Class myClass, ClassDescriptor descriptor) {
return getIdentityMapManager().getCacheKeyForObjectForLock(primaryKey, myClass, descriptor);
}
/**
* INTERNAL:
* Retrieve the cache key for the given identity information.
* @param primaryKey the primary key of the cache key to be retrieved.
* @param myClass the class of the cache key to be retrieved.
*/
public CacheKey getCacheKeyForObject(Object primaryKey, Class myClass, ClassDescriptor descriptor, boolean forMerge) {
return getIdentityMapManager().getCacheKeyForObject(primaryKey, myClass, descriptor, forMerge);
}
/**
* ADVANCED:
* Return the object from the identity with the primary and class.
*/
@Override
public Object getFromIdentityMap(Object primaryKey, Class theClass) {
return getFromIdentityMap(primaryKey, theClass, true);
}
/**
* ADVANCED:
* Return the object from the identity with the primary and class.
*/
public Object getFromIdentityMap(Object primaryKey, Class theClass, ClassDescriptor descriptor) {
return getFromIdentityMap(primaryKey, null, theClass, true, descriptor);
}
/**
* ADVANCED:
* Return the object from the identity with the primary and class.
* Only return invalidated objects if requested.
*/
@Override
public Object getFromIdentityMap(Object primaryKey, Class theClass, boolean shouldReturnInvalidatedObjects) {
return getFromIdentityMap(primaryKey, null, theClass, shouldReturnInvalidatedObjects, getSession().getDescriptor(theClass));
}
/**
* INTERNAL:
* Return the object from the identity with the primary and class.
* Only return invalidated objects if requested.
*/
public Object getFromIdentityMap(Object primaryKey, Object object, Class theClass, boolean shouldReturnInvalidatedObjects, ClassDescriptor descriptor) {
return getIdentityMapManager().getFromIdentityMap(primaryKey, theClass, shouldReturnInvalidatedObjects, descriptor);
}
/**
* INTERNAL:
* Return the object from the local identity map with the primary and class.
* This avoids checking the parent cache for the unit of work.
*/
public Object getFromLocalIdentityMap(Object primaryKey, Class theClass, boolean shouldReturnInvalidatedObjects, ClassDescriptor descriptor) {
return getIdentityMapManager().getFromIdentityMap(primaryKey, theClass, shouldReturnInvalidatedObjects, descriptor);
}
/**
* INTERNAL:
* Return the object from the local identity map with the primary and class.
* This avoids checking the parent cache for the unit of work.
*/
public Object getFromLocalIdentityMapWithDeferredLock(Object primaryKey, Class theClass, boolean shouldReturnInvalidatedObjects, ClassDescriptor descriptor){
return getIdentityMapManager().getFromIdentityMapWithDeferredLock(primaryKey, theClass, shouldReturnInvalidatedObjects, descriptor);
}
/**
* ADVANCED:
* Return the object from the identity with the primary and class.
*/
@Override
public Object getFromIdentityMap(DataRecord rowContainingPrimaryKey, Class theClass) {
return getFromIdentityMap(extractPrimaryKeyFromRow(rowContainingPrimaryKey, theClass), theClass);
}
/**
* ADVANCED:
* Return the object from the identity with the primary and class.
* Only return invalidated objects if requested.
*/
@Override
public Object getFromIdentityMap(DataRecord rowContainingPrimaryKey, Class theClass, boolean shouldReturnInvalidatedObjects) {
return getFromIdentityMap(extractPrimaryKeyFromRow(rowContainingPrimaryKey, theClass), theClass, shouldReturnInvalidatedObjects);
}
/**
* ADVANCED:
* 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.
*/
@Override
public Object getFromIdentityMap(Expression selectionCriteria, Class theClass, DataRecord translationRow) throws QueryException {
return getFromIdentityMap(selectionCriteria, theClass, translationRow, InMemoryQueryIndirectionPolicy.SHOULD_THROW_INDIRECTION_EXCEPTION);
}
/**
* ADVANCED:
* 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.
*/
@Override
public Object getFromIdentityMap(Expression selectionCriteria, Class theClass, DataRecord translationRow, InMemoryQueryIndirectionPolicy valueHolderPolicy) throws QueryException {
int policy = 0;
if (valueHolderPolicy != null) {
policy = valueHolderPolicy.getPolicy();
}
return getFromIdentityMap(selectionCriteria, theClass, translationRow, policy, false);
}
/**
* ADVANCED:
* 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.
*/
@Override
public Object getFromIdentityMap(Expression selectionCriteria, Class theClass, DataRecord translationRow, int valueHolderPolicy) throws QueryException {
return getFromIdentityMap(selectionCriteria, theClass, translationRow, valueHolderPolicy, false);
}
/**
* 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, DataRecord translationRow, int valueHolderPolicy, boolean conforming) {
return getFromIdentityMap(selectionCriteria, theClass, translationRow, valueHolderPolicy, conforming, true, getSession().getDescriptor(theClass));
}
/**
* 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, DataRecord translationRow, int valueHolderPolicy, boolean conforming, boolean shouldReturnInvalidatedObjects) {
return getFromIdentityMap(selectionCriteria, theClass, translationRow, valueHolderPolicy, conforming, shouldReturnInvalidatedObjects, getSession().getDescriptor(theClass));
}
/**
* 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, DataRecord translationRow, int valueHolderPolicy, boolean conforming, boolean shouldReturnInvalidatedObjects, ClassDescriptor descriptor) {
return getIdentityMapManager().getFromIdentityMap(selectionCriteria, theClass, translationRow, valueHolderPolicy, conforming, shouldReturnInvalidatedObjects, descriptor);
}
/**
* INTERNAL:
* Return the object from the identity with the primary and class.
*/
public Object getFromIdentityMapWithDeferredLock(Object primaryKey, Class theClass, ClassDescriptor descriptor) {
return getFromIdentityMapWithDeferredLock(primaryKey, theClass, true, descriptor);
}
/**
* INTERNAL:
* Return the object from the identity with the primary and class.
* Only return invalidated objects if requested
*/
public Object getFromIdentityMapWithDeferredLock(Object primaryKey, Class theClass, boolean shouldReturnInvalidatedObjects, ClassDescriptor descriptor) {
return getIdentityMapManager().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() {
if (session.hasBroker()) {
return getSession().getBroker().getIdentityMapAccessorInstance().getIdentityMapManager();
}
return identityMapManager;
}
/**
* INTERNAL: (public to allow test cases to check)
* Return the identity map for the class, if missing create a new one.
*/
public IdentityMap getIdentityMap(Class theClass) {
ClassDescriptor descriptor = getSession().getDescriptor(theClass);
if (descriptor == null) {
throw ValidationException.missingDescriptor(theClass.toString());
}
return getIdentityMap(descriptor);
}
/**
* INTERNAL:
* Get the identity map for the given class from the IdentityMapManager
*/
public IdentityMap getIdentityMap(ClassDescriptor descriptor) {
return getIdentityMap(descriptor, false);
}
/**
* INTERNAL:
* Get the identity map for the given class from the IdentityMapManager
*/
public IdentityMap getIdentityMap(ClassDescriptor descriptor, boolean returnNullIfMissing) {
return getIdentityMapManager().getIdentityMap(descriptor, returnNullIfMissing);
}
/**
* INTERNAL:
* Get the cached results associated with a query. Results are cached by the
* values of the parameters to the query so different parameters will have
* different cached results.
*/
public Object getQueryResult(ReadQuery query, List parameters, boolean checkExpiry) {
return getIdentityMapManager().getQueryResult(query, parameters, checkExpiry);
}
/**
* ADVANCED:
* Return the remaining life of this object. This method is associated with use of
* cache invalidation and returns the difference between the next expiry
* time of the object and its read time. The method will return 0 for invalidated objects.
*/
@Override
public long getRemainingValidTime(Object object) {
Object primaryKey = getSession().getId(object);
ClassDescriptor descriptor = getSession().getDescriptor(object);
CacheKey key = getCacheKeyForObjectForLock(primaryKey, object.getClass(), 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(Object primaryKey, Class theClass) {
return getIdentityMapManager().getWrapper(primaryKey, theClass);
}
/**
* INTERNAL:
* Returns the single write Lock manager for this session
*/
public WriteLockManager getWriteLockManager() {
return getIdentityMapManager().getWriteLockManager();
}
/**
* ADVANCED:
* Extract the write lock value from the identity map.
*/
@Override
public Object getWriteLockValue(Object object) {
return getWriteLockValue(getSession().getId(object), object.getClass());
}
/**
* ADVANCED:
* Extract the write lock value from the identity map.
*/
@Override
public Object getWriteLockValue(Object primaryKey, Class theClass) {
return getWriteLockValue(primaryKey, theClass, getSession().getDescriptor(theClass));
}
/**
* ADVANCED:
* Extract the write lock value from the identity map.
*/
public Object getWriteLockValue(Object primaryKey, Class theClass, ClassDescriptor descriptor) {
return getIdentityMapManager().getWriteLockValue(primaryKey, theClass, descriptor);
}
/**
* PUBLIC:
* Reset the entire object cache.
* 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.
* Extreme 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.
*/
@Override
public void initializeAllIdentityMaps() {
getSession().log(SessionLog.FINER, SessionLog.CACHE, "initialize_all_identitymaps");
getIdentityMapManager().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.
*/
@Override
public void initializeIdentityMap(Class theClass) {
getSession().log(SessionLog.FINER, SessionLog.CACHE, "initialize_identitymap", theClass);
getIdentityMapManager().initializeIdentityMap(theClass);
}
/**
* PUBLIC:
* Reset the entire local object cache.
* This throws away any objects that have been read in.
* Extreme 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.
*/
@Override
public void initializeIdentityMaps() {
getSession().log(SessionLog.FINER, SessionLog.CACHE, "initialize_identitymaps");
getIdentityMapManager().initializeIdentityMaps();
if (getSession().hasCommitManager()) {
getSession().getCommitManager().reinitialize();
}
}
/**
* ADVANCED:
* Set an object to be invalid in the cache.
* If the object does not exist in the cache, this method will return
* without any action.
*/
@Override
public void invalidateObject(Object object) {
invalidateObject(object, false);
}
/**
* ADVANCED:
* Set an object to be invalid in the cache.
* @param invalidateCluster if true the invalidation will be broadcast to each server in the cluster.
*/
@Override
public void invalidateObject(Object object, boolean invalidateCluster) {
invalidateObject(getSession().getId(object), object.getClass(), invalidateCluster);
}
/**
* ADVANCED:
* Set an object to be invalid in the cache.
* If the object does not exist in the cache, this method will return
* without any action.
*/
@Override
public void invalidateObject(Object primaryKey, Class theClass) {
invalidateObject(primaryKey, theClass, false);
}
/**
* ADVANCED:
* Set an object to be invalid in the cache.
* @param invalidateCluster if true the invalidation will be broadcast to each server in the cluster.
*/
@Override
public void invalidateObject(Object primaryKey, Class theClass, boolean invalidateCluster) {
if (primaryKey == null) {
return;
}
ClassDescriptor descriptor = getSession().getDescriptor(theClass);
//forward the call to getCacheKeyForObject locally in case subclasses overload
CacheKey key = getCacheKeyForObjectForLock(primaryKey, theClass, descriptor);
if (key != null) {
key.setInvalidationState(CacheKey.CACHE_KEY_INVALID);
}
if (invalidateCluster) {
CommandManager rcm = getSession().getCommandManager();
if (rcm != null) {
UnitOfWorkChangeSet changeSet = new UnitOfWorkChangeSet(getSession());
ObjectChangeSet objectChangeSet = new ObjectChangeSet(primaryKey, descriptor, null, changeSet, false);
objectChangeSet.setSynchronizationType(ClassDescriptor.INVALIDATE_CHANGED_OBJECTS);
changeSet.getAllChangeSets().put(objectChangeSet, objectChangeSet);
MergeChangeSetCommand command = new MergeChangeSetCommand();
command.setChangeSet(changeSet);
rcm.propagateCommand(command);
}
}
if (session.getProject().allowExtendedCacheLogging()) {
session.log(SessionLog.FINEST, SessionLog.CACHE, "cache_item_invalidation", new Object[] {theClass, primaryKey, Thread.currentThread().getId(), Thread.currentThread().getName()});
}
}
/**
* ADVANCED:
* Set an object to be invalid in the cache.
* If the object does not exist in the cache, this method will return
* without any action.
*/
@Override
public void invalidateObject(DataRecord rowContainingPrimaryKey, Class theClass) {
invalidateObject(rowContainingPrimaryKey, theClass, false);
}
/**
* ADVANCED:
* Set an object to be invalid in the cache.
* @param invalidateCluster if true the invalidation will be broadcast to each server in the cluster.
*/
@Override
public void invalidateObject(DataRecord rowContainingPrimaryKey, Class theClass, boolean invalidateCluster) {
invalidateObject(extractPrimaryKeyFromRow(rowContainingPrimaryKey, theClass), theClass, invalidateCluster);
}
/**
* ADVANCED:
* Set all of the objects from the given Expression to be invalid in the cache.
*/
@Override
public void invalidateObjects(Expression selectionCriteria) {
invalidateObjects(selectionCriteria, selectionCriteria.getBuilder().getQueryClass(), new DatabaseRecord(0), true);
}
/**
* ADVANCED:
* Queries the cache in-memory with the passed in criteria and invalidates matching Objects.
* If the expression is too complex either all or none object of theClass invalidated (depending on shouldInvalidateOnException value).
* @param selectionCriteria Expression selecting the Objects to be returned
* @param theClass Class to be considered
* @param translationRow Record
* @param shouldInvalidateOnException boolean indicates weather to invalidate the object if conform threw exception.
*/
@Override
public void invalidateObjects(Expression selectionCriteria, Class theClass, DataRecord translationRow, boolean shouldInvalidateOnException) {
getIdentityMapManager().invalidateObjects(selectionCriteria, theClass, translationRow, shouldInvalidateOnException);
}
/**
* ADVANCED:
* Set all of the objects in the given collection to be invalid in the cache.
* This method will take no action for any objects in the collection that do not exist in the cache.
*/
@Override
public void invalidateObjects(Collection collection) {
invalidateObjects(collection, false);
}
/**
* ADVANCED:
* Set all of the objects in the given collection to be invalid in the cache.
* @param invalidateCluster if true the invalidation will be broadcast to each server in the cluster.
*/
@Override
public void invalidateObjects(Collection collection, boolean invalidateCluster) {
Iterator iterator = collection.iterator();
while (iterator.hasNext()) {
invalidateObject(iterator.next(), invalidateCluster);
}
}
/**
* ADVANCED:
* Set all of the objects of a specific class to be invalid in the cache.
* Will set the recurseAndInvalidateToParentRoot flag on inheritance to true.
*/
@Override
public void invalidateClass(Class myClass) {
invalidateClass(myClass, true);
}
/**
* ADVANCED:
* Set all of the objects of a specific class to be invalid in the cache.
* User can set the recurse flag to false if they do not want to invalidate
* all the classes within an inheritance tree and instead invalidate the subtree rooted at myClass.
* @param myClass - the class where we start invalidation
* @param recurseAndInvalidateToParentRoot - default is true where we invalidate
* up the inheritance tree to the root descriptor
*/
@Override
public void invalidateClass(Class myClass, boolean recurseAndInvalidateToParentRoot) {
//forward the call to getIdentityMap locally in case subclasses overload
IdentityMap identityMap = this.getIdentityMap(myClass); // will always return the root IdentityMap
//bug 227430: Deadlock in IdentityMapAccessor.
//removed synchronization that would result in deadlock
//no need to synchronize as changes to identity map will not aversely affect this code
//bug 275724: IdentityMapAccessor.invalidateClass() should not check ReadLock when invalidating
Enumeration keys = identityMap.keys(false); // do not check readlock
while (keys.hasMoreElements()) {
CacheKey key = keys.nextElement();
Object obj = key.getObject();
// 312503: When recurse is false we also invalidate all assignable implementing subclasses of [obj]
if (recurseAndInvalidateToParentRoot || ((obj != null) && (null != myClass) && myClass.isAssignableFrom(obj.getClass()))) {
key.setInvalidationState(CacheKey.CACHE_KEY_INVALID);
}
}
invalidateQueryCache(myClass);
if (session.getProject().allowExtendedCacheLogging()) {
session.log(SessionLog.FINEST, SessionLog.CACHE, "cache_class_invalidation", new Object[] {myClass, Thread.currentThread().getId(), Thread.currentThread().getName()});
}
}
/**
* Invalidate/remove any results for the class from the query cache.
* This is used to invalidate the query cache on any change.
*/
@Override
public void invalidateQueryCache(Class classThatChanged) {
getIdentityMapManager().invalidateQueryCache(classThatChanged);
}
/**
* ADVANCED:
* Set all of the objects from all identity maps to be invalid in the cache.
*/
@Override
public void invalidateAll() {
Iterator identiyMapClasses = getIdentityMapManager().getIdentityMapClasses();
while (identiyMapClasses.hasNext()) {
invalidateClass((Class) identiyMapClasses.next());
}
}
/**
* ADVANCED:
* Return if this object is valid in the cache.
*/
@Override
public boolean isValid(Object object) {
return isValid(getSession().getId(object), object.getClass());
}
/**
* ADVANCED:
* Return if this object is valid in the cache.
*/
@Override
public boolean isValid(Object primaryKey, Class theClass) {
ClassDescriptor descriptor = getSession().getDescriptor(theClass);
//forward the call to getCacheKeyForObject locally in case subclasses overload
CacheKey key = getCacheKeyForObjectForLock(primaryKey, theClass, descriptor);
if (key == null) {
throw QueryException.classPkDoesNotExistInCache(theClass, primaryKey);
}
return !descriptor.getCacheInvalidationPolicy().isInvalidated(key);
}
/**
* ADVANCED:
* Return if this object is valid in the cache.
*/
@Override
public boolean isValid(DataRecord rowContainingPrimaryKey, Class theClass) {
return isValid(extractPrimaryKeyFromRow(rowContainingPrimaryKey, theClass), theClass);
}
/**
* 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.
*/
@Override
public void printIdentityMap(Class businessClass) {
if (getSession().shouldLog(SessionLog.SEVERE, SessionLog.CACHE)) {
getIdentityMapManager().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.
*/
@Override
public void printIdentityMaps() {
if (getSession().shouldLog(SessionLog.SEVERE, SessionLog.CACHE)) {
getIdentityMapManager().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.
*/
@Override
public void printIdentityMapLocks() {
if (getSession().shouldLog(SessionLog.SEVERE, SessionLog.CACHE)) {
getIdentityMapManager().printLocks();
}
}
/**
* ADVANCED:
* Register the object with the cache.
* The object must always be registered with its version number if optimistic locking is used.
*/
@Override
public Object putInIdentityMap(Object object) {
return putInIdentityMap(object, getSession().getId(object));
}
/**
* ADVANCED:
* Register the object with the cache.
* The object must always be registered with its version number if optimistic locking is used.
*/
@Override
public Object putInIdentityMap(Object object, Object key) {
return putInIdentityMap(object, key, null);
}
/**
* ADVANCED:
* Register the object with the cache.
* The object must always be registered with its version number if optimistic locking is used.
*/
@Override
public Object putInIdentityMap(Object object, Object key, Object writeLockValue) {
return putInIdentityMap(object, key, writeLockValue, 0);
}
/**
* ADVANCED:
* Register the object with the cache.
* 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.
*/
@Override
public Object putInIdentityMap(Object object, Object key, Object writeLockValue, long readTime) {
ClassDescriptor descriptor = getSession().getDescriptor(object);
return putInIdentityMap(object, key, writeLockValue, readTime, descriptor);
}
/**
* ADVANCED:
* Register the object with the cache.
* 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 Object putInIdentityMap(Object object, Object key, Object writeLockValue, long readTime, ClassDescriptor descriptor) {
CacheKey cacheKey = internalPutInIdentityMap(object, key, writeLockValue, readTime, descriptor);
if (cacheKey == null) {
return null;
}
return cacheKey.getObject();
}
/**
* INTERNAL:
* Set the results for a query.
* Query results are cached based on the parameter values provided to the query
* different parameter values access different caches.
*/
public void putQueryResult(ReadQuery query, List parameters, Object results) {
getIdentityMapManager().putQueryResult(query, parameters, results);
}
/**
* Index the cache key by the index values.
*/
public void putCacheKeyByIndex(CacheIndex index, CacheId indexValues, CacheKey cacheKey, ClassDescriptor descriptor) {
getIdentityMapManager().putCacheKeyByIndex(index, indexValues, cacheKey, descriptor);
}
/**
* Return the cache key for the cache index or null if not found.
*/
public CacheKey getCacheKeyByIndex(CacheIndex index, CacheId indexValues, boolean shouldCheckExpiry, ClassDescriptor descriptor) {
return getIdentityMapManager().getCacheKeyByIndex(index, indexValues, shouldCheckExpiry, descriptor);
}
/**
* INTERNAL:
* Register the object with the cache.
* 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.
* Return the cache-key.
*/
public CacheKey internalPutInIdentityMap(Object object, Object key, Object writeLockValue, long readTime, ClassDescriptor descriptor) {
return getIdentityMapManager().putInIdentityMap(object, 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() {
getIdentityMapManager().releaseWriteLock();
}
/**
* ADVANCED:
* Remove the object from the object cache.
* Caution should be used when calling to avoid violating object identity.
* The application should only call this is it knows that no references to the object exist.
*/
@Override
public Object removeFromIdentityMap(Object object) {
Class theClass = object.getClass();
return removeFromIdentityMap(getSession().getId(object), theClass, getSession().getDescriptor(theClass), object);
}
/**
* ADVANCED:
* Remove the object from the object cache.
*/
@Override
public Object removeFromIdentityMap(Object key, Class theClass) {
ClassDescriptor descriptor = getSession().getDescriptor(theClass);
if (descriptor == null){
return null;
}
return removeFromIdentityMap(key, theClass, descriptor, null);
}
/**
* INTERNAL:
* Remove the object from the object cache.
*/
public Object removeFromIdentityMap(Object key, Class theClass, ClassDescriptor descriptor, Object object) {
return getIdentityMapManager().removeFromIdentityMap(key, theClass, descriptor, object);
}
/**
* 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(Object primaryKey, Class theClass, Object wrapper) {
getIdentityMapManager().setWrapper(primaryKey, theClass, wrapper);
}
/**
* ADVANCED:
* Update the write lock value in the cache.
*/
@Override
public void updateWriteLockValue(Object object, Object writeLockValue) {
updateWriteLockValue(getSession().getId(object), object.getClass(), writeLockValue);
}
/**
* ADVANCED:
* Update the write lock value in the cache.
*/
@Override
public void updateWriteLockValue(Object primaryKey, Class theClass, Object writeLockValue) {
getIdentityMapManager().setWriteLockValue(primaryKey, theClass, writeLockValue);
}
/**
* INTERNAL:
* This can be used to help debugging an object identity problem.
* An object identity problem is when an object in the cache references an object not in the cache.
* This method will validate that all cached objects are in a correct state.
*/
@Override
public void validateCache() {
//pass certain calls to this in order to allow subclasses to implement own behavior
getSession().log(SessionLog.FINER, SessionLog.CACHE, "validate_cache");
// This define an inner class for process the iteration operation, don't be scared, its just an inner class.
DescriptorIterator iterator = new DescriptorIterator() {
@Override
public void iterate(Object object) {
if (!containsObjectInIdentityMap(IdentityMapAccessor.this.session.getDescriptor(object.getClass()).getObjectBuilder().extractPrimaryKeyFromObject(object, IdentityMapAccessor.this.getSession()), object.getClass())) {
IdentityMapAccessor.this.session.log(SessionLog.FINEST, SessionLog.CACHE, "stack_of_visited_objects_that_refer_to_the_corrupt_object", getVisitedStack());
IdentityMapAccessor.this.session.log(SessionLog.FINER, SessionLog.CACHE, "corrupt_object_referenced_through_mapping", getCurrentMapping());
IdentityMapAccessor.this.session.log(SessionLog.FINER, SessionLog.CACHE, "corrupt_object", object);
}
}
};
iterator.setSession(getSession());
Iterator descriptors = getSession().getDescriptors().values().iterator();
while (descriptors.hasNext()) {
ClassDescriptor descriptor = descriptors.next();
IdentityMap cache = getIdentityMap(descriptor, true);
if (cache != null) {
for (Enumeration mapEnum = cache.elements(); mapEnum.hasMoreElements();) {
iterator.startIterationOn(mapEnum.nextElement());
}
}
}
}
}