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package com.sun.ejb.containers.util.cache;
import com.sun.appserv.util.cache.CacheListener;
import com.sun.ejb.containers.EjbContainerUtilImpl;
import com.sun.ejb.spi.container.SFSBContainerCallback;
import com.sun.ejb.spi.container.StatefulEJBContext;
import com.sun.ejb.base.stats.StatefulSessionStoreMonitor;
import com.sun.ejb.monitoring.stats.EjbCacheStatsProviderDelegate;
import org.glassfish.ha.store.api.BackingStore;
import org.glassfish.ha.store.util.SimpleMetadata;
import org.glassfish.logging.annotation.LogMessageInfo;
import org.glassfish.ha.store.api.BackingStoreException;
import java.io.Serializable;
import java.util.*;
import java.util.logging.*;
public class LruSessionCache
extends LruEJBCache
implements EjbCacheStatsProviderDelegate
{
@LogMessageInfo(
message = "[{0}]: Exception in backingStore.remove([{1}])",
level = "WARNING")
private static final String EXCEPTION_BACKING_STORE_REMOVE = "AS-EJB-00002";
@LogMessageInfo(
message = "[{0}]: passivateEJB(), Exception caught ->",
level = "WARNING")
private static final String PASSIVATE_EJB_EXCEPTION_CAUGHT = "AS-EJB-00003";
@LogMessageInfo(
message = "[{0}]: Cannot load from BACKUPSTORE FOR Key: <[{1}]>",
level = "SEVERE",
cause = "Didn't find the data related with the given session key.",
action = "Check if the session bean already timed out.")
private static final String CANNOT_LOAD_FROM_BACKUP_STORE = "AS-EJB-00004";
@LogMessageInfo(
message = "[{0}]: Exception while loading from backup session: <[{1}]>",
level = "SEVERE",
cause = "Session store exception or deserialization exception happened.",
action = "Check error message and exception stack.")
private static final String EXCEPTION_LOADING_BACKUP_SESSION = "AS-EJB-00005";
@LogMessageInfo(
message = "[{0}]: Error while loading from backup session: <[{1}]>",
level = "SEVERE",
cause = "Session store error or deserialization error happened.",
action = "Check error message and exception stack.")
private static final String ERROR_LOADING_BACKUP_SESSION = "AS-EJB-00006";
@LogMessageInfo(
message = "[{0}]: Exception during backingStore.passivateSave([{1}])",
level = "WARNING")
private static final String EXCEPTION_DURING_PASSIVATE_SAVE = "AS-EJB-00007";
@LogMessageInfo(
message = "[{0}]: Iterator(), resetting head.lPrev",
level = "WARNING")
private static final String ITERATOR_RESETTING_HEAD_LPREV = "AS-EJB-00008";
@LogMessageInfo(
message = "[{0}]: Exiting TrimTimedoutBeans() because current cache state: [{1}]",
level = "WARNING")
private static final String EXITING_TRIM_TIMEDOUT_BEANS = "AS-EJB-00009";
@LogMessageInfo(
message = "[{0}]: TrimTimedoutBeans(), resetting head.lPrev",
level = "WARNING")
private static final String TRIM_TIMEDOUT_BEANS_RESETTING_HEAD_LPREV = "AS-EJB-00010";
@LogMessageInfo(
message = "[{0}]: Exiting TrimUnSortedTimedoutBeans() because current cache state: [{1}]",
level = "WARNING")
private static final String EXITING_TRIM_UNSORTED_TIMEDOUT_BEANS = "AS-EJB-00011";
@LogMessageInfo(
message = "Cannot find stateful session bean [{0}] in memory, and will not read it from disk because " +
"current stateful session bean passivation-capable value is false",
level = "INFO")
private static final String SFSB_NOT_FOUND_WHEN_PASSIVATION_DISABLED = "AS-EJB-00049";
protected int cacheIdleTimeoutInSeconds;
protected int removalTimeoutInSeconds;
protected Object loadCountLock = new Object();
protected int loadFromBackupCount;
protected boolean removeIfIdle = false;
private int numVictimsAccessed = 0;
protected SFSBContainerCallback container;
protected BackingStore backingStore;
private static final byte CACHE_ITEM_VALID = 0;
private static final byte CACHE_ITEM_LOADING = 1;
private static final byte CACHE_ITEM_REMOVED = 2;
protected String configData;
private static final int STATE_RUNNING = 0;
private static final int STATE_SHUTTING_DOWN = 1;
private static final int STATE_UNDEPLOYING = 2;
private static final int STATE_DESTROYED = 3;
private int currentCacheState = STATE_RUNNING;
protected int confMaxCacheSize = Integer.MAX_VALUE;
// TODO enable when enabling monitoring in SFSB container
// private StatefulSessionStoreMonitor sfsbStoreMonitor;
/**
* Destroys all references. This is the last method call of this object's
* life cycle.
*
* This method is called during undeploy of ejb container.
*/
public void destroy() {
this.currentCacheState = STATE_DESTROYED;
this.container = null;
super.destroy();
}
public LruSessionCache(String cacheName,
SFSBContainerCallback container,
int cacheIdleTime, int removalTime) {
super();
super.setCacheName(cacheName);
this.container = container;
this.cacheIdleTimeoutInSeconds =
(cacheIdleTime <= 0) ? 0 : cacheIdleTime;
this.removalTimeoutInSeconds =
(removalTime <= 0) ? 0 : removalTime;
if (cacheIdleTimeoutInSeconds > 0) {
super.timeout = cacheIdleTimeoutInSeconds*1000L;
}
removeIfIdle = (removalTimeoutInSeconds > 0)
&& (removalTimeoutInSeconds <= cacheIdleTimeoutInSeconds);
}
public void setBackingStore(BackingStore store) {
this.backingStore = store;
}
public void setStatefulSessionStoreMonitor(
StatefulSessionStoreMonitor storeMonitor)
{
// this.sfsbStoreMonitor = storeMonitor;
}
/**
* trim the item from the cache and notify listeners
* @param item to be trimmed
*/
protected void trimItem(CacheItem item) {
LruCacheItem removed = (LruCacheItem) item;
if (removeIfIdle) {
StatefulEJBContext ctx = (StatefulEJBContext) item.getValue();
long idleThreshold =
System.currentTimeMillis() - removalTimeoutInSeconds*1000L;
if (ctx.getLastAccessTime() <= idleThreshold) {
container.passivateEJB(ctx);
return;
}
}
for (int i = 0; i < listeners.size(); i++) {
CacheListener listener = (CacheListener) listeners.get(i);
listener.trimEvent(removed.getKey(), removed.getValue());
}
}
protected void itemAccessed(CacheItem item) {
LruCacheItem lc = (LruCacheItem) item;
synchronized (this) {
if (lc.isTrimmed()) {
lc.setTrimmed(false);
numVictimsAccessed += 1;
CacheItem overflow = super.itemAdded(item);
if (overflow != null) {
trimItem(overflow);
}
} else {
super.itemAccessed(item);
}
}
}
public int getLoadFromBackupCount() {
return loadFromBackupCount;
}
protected void incrementLoadFromBackupCount() {
synchronized (loadCountLock) {
loadFromBackupCount++;
}
}
// return the EJB for the given instance key
//Called from StatefulSessionContainer
public StatefulEJBContext lookupEJB(Serializable sessionKey,
SFSBContainerCallback container, Object cookie)
{
int hashCode = hash(sessionKey);
int index = getIndex(hashCode);
CacheItem item = null;
LruSessionCacheItem newItem = null;
Object value = null;
synchronized (bucketLocks[index]) {
item = buckets[index];
for (; item != null; item = item.getNext()) {
if ( (hashCode == item.getHashCode()) &&
(item.getKey().equals(sessionKey)) )
{
value = item.getValue();
break;
}
}
// update the stats in line
if (value != null) {
itemAccessed(item);
}
}
if (value != null) {
incrementHitCount();
return (StatefulEJBContext) value;
}
incrementMissCount();
if (item != null) {
synchronized (item) {
LruSessionCacheItem lruItem = (LruSessionCacheItem) item;
if ((lruItem.getValue() == null) && (lruItem.cacheItemState == CACHE_ITEM_LOADING)) {
lruItem.waitCount++;
try { item.wait(); } catch (InterruptedException inEx) {}
}
return (StatefulEJBContext) item.getValue();
}
}
// don't try to lookup session store when passivation capable is false
if (!container.isPassivationCapable()) {
if (_logger.isLoggable(Level.INFO)) {
_logger.log(Level.INFO, SFSB_NOT_FOUND_WHEN_PASSIVATION_DISABLED);
}
return null;
}
//This is the thread that actually does the I/O
long activationStartTime = -1;
/*if (sfsbStoreMonitor.isMonitoringOn()) {
activationStartTime = System.currentTimeMillis();
}*/
try {
value = getStateFromStore(sessionKey, container);
newItem = new LruSessionCacheItem(hashCode, sessionKey,
value, -1, CACHE_ITEM_LOADING);
newItem.setNext( buckets[index] );
buckets[index] = newItem;
synchronized (buckets[index]) {
if (value == null) {
//Remove the temp cacheItem that we created.
CacheItem prev = null;
for (CacheItem current = buckets[index]; current != null;
current = current.getNext())
{
if (current == newItem) {
if (prev == null) {
buckets[index] = current.getNext();
} else {
prev.setNext( current.getNext() );
}
current.setNext( null );
break;
}
prev = current;
}
} else {
container.activateEJB(sessionKey,
(StatefulEJBContext) value, cookie);
// sfsbStoreMonitor.incrementActivationCount(true);
CacheItem overflow = itemAdded(newItem);
incrementEntryCount();
// make sure we are are not crossing the threshold
if (overflow != null) {
trimItem(overflow);
}
}
} //end of sync
} catch (jakarta.ejb.EJBException ejbEx) {
//sfsbStoreMonitor.incrementActivationCount(false);
remove(sessionKey);
value = null;
} finally {
if (newItem != null) {
synchronized (newItem) {
newItem.cacheItemState = CACHE_ITEM_VALID;
if (newItem.waitCount > 0) {
newItem.notifyAll();
}
}
}
if (activationStartTime != -1) {
long timeSpent = System.currentTimeMillis()
- activationStartTime;
//sfsbStoreMonitor.setActivationTime(timeSpent);
}
}
return (StatefulEJBContext) value;
}
//Called from StatefulSessionContainer
//public void deleteEJB(Object sessionKey)
public Object remove(Object sessionKey) {
return remove(sessionKey, true);
}
public Object remove(Object sessionKey, boolean removeFromStore) {
int hashCode = hash(sessionKey);
int index = getIndex(hashCode);
CacheItem prev = null, item = null;
synchronized (bucketLocks[index]) {
for (item = buckets[index]; item != null; item = item.getNext()) {
if ((hashCode == item.getHashCode()) && sessionKey.equals(item.getKey())) {
if (prev == null) {
buckets[index] = item.getNext();
} else {
prev.setNext( item.getNext() );
}
item.setNext( null );
itemRemoved(item);
((LruSessionCacheItem) item).cacheItemState = CACHE_ITEM_REMOVED;
break;
}
prev = item;
}
//remove it from the BackingStore also
//In case it had been checkpointed
// remove it from BackingStore outside sync block
if (removeFromStore) {
try {
if (backingStore != null) {
backingStore.remove((Serializable) sessionKey);
}
} catch (BackingStoreException sfsbEx) {
_logger.log(Level.WARNING, EXCEPTION_BACKING_STORE_REMOVE, new Object[]{cacheName, sessionKey, sfsbEx});
}
}
}
if (item != null) {
decrementEntryCount();
incrementRemovalCount();
incrementHitCount();
} else {
incrementMissCount();
}
return null;
}
/**
* Called by StatefulSessionContainer before passivation to determine whether
* or not removal-timeout has elapsed for a cache item. If so, it will be
* directly removed instead of passivated. See issue 16188.
*/
public boolean eligibleForRemovalFromCache(StatefulEJBContext ctx, Serializable sessionKey) {
if (removeIfIdle) {
long idleThreshold = System.currentTimeMillis()
- removalTimeoutInSeconds * 1000L;
if (ctx.getLastAccessTime() <= idleThreshold) {
if (_logger.isLoggable(Level.FINE)) {
_logger.log(Level.FINE, cacheName
+ ": Removing session "
+ " instead of passivating for key: " + sessionKey);
}
return true;
}
}
return false;
}
// Called by Cache implementation thru container, on Recycler's thread
// The container has already acquired the lock on the StatefulEJBContext
public boolean passivateEJB(StatefulEJBContext ctx, Serializable sessionKey)
throws java.io.NotSerializableException
{
try {
int hashCode = hash(sessionKey);
int index = getIndex(hashCode);
CacheItem prev = null, item = null;
synchronized (bucketLocks[index]) {
for (item = buckets[index]; item != null; item = item.getNext()) {
if (item.getValue() == ctx) {
LruCacheItem lruSCItem = (LruCacheItem) item;
if (!lruSCItem.isTrimmed()) {
//Was accessed just after marked for passivation
if(_logger.isLoggable(Level.FINE)) {
_logger.log(Level.FINE, cacheName + ": session accessed after marked for passivation: " + sessionKey);
}
return false;
}
break;
}
prev = item;
}
if (item == null) {
//Could have been removed
return true; //???????
}
}
// we don't do passivation when passivation is disabled, but we still need remove the trimmed
// bean from cache
if (container.isPassivationCapable() && !saveStateToStore(sessionKey, ctx)) {
return false;
}
synchronized (bucketLocks[index]) {
prev = null;
for (item = buckets[index]; item != null; item = item.getNext()) {
if (item.getValue() == ctx) {
LruCacheItem lruSCItem = (LruCacheItem) item;
if (!lruSCItem.isTrimmed()) {
//Was accessed just after marked for passivation
return false;
}
if (prev == null) {
buckets[index] = item.getNext();
} else {
prev.setNext( item.getNext() );
}
item.setNext( null );
break;
}
prev = item;
}
}
if (item != null) {
decrementEntryCount();
incrementRemovalCount();
}
return true;
} catch (java.io.NotSerializableException notSerEx) {
_logger.log(Level.FINE, "", notSerEx);
throw notSerEx;
} catch (Exception ex) {
_logger.log(Level.WARNING, PASSIVATE_EJB_EXCEPTION_CAUGHT, new Object[]{cacheName, ex});
_logger.log(Level.FINE, "", ex);
}
return false;
} //passivateEJB
private Object getStateFromStore(Serializable sessionKey, SFSBContainerCallback container) {
Object object = null;
try {
SimpleMetadata beanState = null;
if (backingStore != null) {
beanState = backingStore.load(sessionKey, null);
}
byte[] data = (beanState != null)
? beanState.getState()
: null;
if ( data == null ) {
if(_logger.isLoggable(Level.SEVERE)) {
_logger.log(Level.SEVERE, CANNOT_LOAD_FROM_BACKUP_STORE, new Object[]{cacheName, sessionKey});
}
} else {
//sfsbStoreMonitor.setActivationSize(data.length);
incrementLoadFromBackupCount();
object = container.deserializeData(data);
}
} catch ( Exception ex ) {
_logger.log(Level.SEVERE, EXCEPTION_LOADING_BACKUP_SESSION, new Object[]{cacheName, sessionKey, ex});
} catch ( Error ex ) {
_logger.log(Level.SEVERE, ERROR_LOADING_BACKUP_SESSION, new Object[]{cacheName, sessionKey, ex});
}
return object;
}
private boolean saveStateToStore(Serializable sessionKey, StatefulEJBContext ctx)
throws java.io.NotSerializableException, java.io.IOException
{
byte[] data = container.serializeContext(ctx);
//If we are here then we were able to serialize the object successfully
boolean status = false;
if (data != null) {
SimpleMetadata beanState = new SimpleMetadata(
ctx.getVersion(), ctx.getLastAccessTime(), removalTimeoutInSeconds*1000L, data);
//Note: Don't increment the version here because
// this is called on an async thread and the client
// already has the correct version
beanState.setVersion(ctx.getVersion());
try {
if(backingStore != null) {
backingStore.save(sessionKey, beanState, !ctx.existsInStore());
// sfsbStoreMonitor.setPassivationSize(data.length);
status = true;
}
} catch (BackingStoreException sfsbEx) {
_logger.log(Level.WARNING, EXCEPTION_DURING_PASSIVATE_SAVE, new Object[]{cacheName, sessionKey, sfsbEx});
}
}
return status;
}
private void trimSelectedVictims(ArrayList victims) {
int sz = victims.size();
synchronized (this) {
trimCount += sz;
}
CacheItem item = null;
for (int i=0; i valueList = new ArrayList();
synchronized (this) {
LruCacheItem item = tail;
while (item != null) {
StatefulEJBContext ctx = (StatefulEJBContext) item.getValue();
if (ctx != null) {
item.setTrimmed(true);
valueList.add(ctx);
}
// Ensure that for head the lPrev is null
if ((item == head) && (item.getLPrev() != null)) {
_logger.log(Level.WARNING, ITERATOR_RESETTING_HEAD_LPREV, cacheName);
item.setLPrev(null);
}
// traverse to the previous one
item = item.getLPrev();
}
}
for (StatefulEJBContext ctx : valueList) {
container.passivateEJB(ctx);
}
}
/**
* trim the timedOut entries from the cache.
* This call is to be scheduled by a thread managed by the container.
* In this case a sorted LRU list exists based on access time and this
* list is scanned
*/
public void trimTimedoutItems(int maxTrimCount) {
int count = 0;
LruCacheItem item;
long currentTime = System.currentTimeMillis();
long idleThresholdTime = currentTime - cacheIdleTimeoutInSeconds*1000L;
ArrayList victimList = new ArrayList();
synchronized (this) {
if(_logger.isLoggable(Level.FINE)) {
_logger.log(Level.FINE,
"[" + cacheName + "]: TrimTimedoutBeans started...");
}
if (tail == null) { // No LRU list exists
if(_logger.isLoggable(Level.FINE)) {
_logger.log(Level.FINE,
"[" + cacheName + "]: TrimTimedoutBeans "
+ " finished after removing 0 idle beans");
}
head = null;
return;
}
// traverse LRU list and collect victims into the victimList
item = tail;
while (true) {
if (currentCacheState != STATE_RUNNING) {
_logger.log(Level.WARNING, EXITING_TRIM_TIMEDOUT_BEANS, new Object[]{cacheName, currentCacheState});
break;
}
StatefulEJBContext ctx = (StatefulEJBContext) item.getValue();
if (ctx != null) {
// if we found a valid item, add it to the list
if ((ctx.getLastAccessTime() <= idleThresholdTime) &&
ctx.canBePassivated()) {
item.setTrimmed(true);
victimList.add(item);
} else {
break;
}
}
//Ensure that for head the lPrev is null
if( (item == head) && (item.getLPrev() != null) ) {
_logger.log(Level.WARNING, TRIM_TIMEDOUT_BEANS_RESETTING_HEAD_LPREV, cacheName);
item.setLPrev(null);
}
// traverse to the previous one
item = item.getLPrev();
if (item == null) {
break;
}
//for the last item that was picked up as a victim disconnect
//it from the list
item.getLNext().setLPrev(null);
item.getLNext().setLNext(null);
item.setLNext(null);
}
if (item == tail) {
// no items were selected for trimming
if(_logger.isLoggable(Level.FINE)) {
_logger.log(Level.FINE,
"[" + cacheName + "]: TrimTimedoutBeans "
+ " finished after removing 0 idle beans");
}
return;
}
// there is at least one item selected for trimming
if (item == null)
head = null;
tail = item;
count = victimList.size();
listSize -= count;
trimCount += count;
}
// trim the items from the BaseCache
for (int idx = 0;idx < count; idx++) {
trimItem((LruCacheItem) victimList.get(idx));
}
if(_logger.isLoggable(Level.FINE)) {
_logger.log(Level.FINE,
"[" + cacheName + "]: TrimTimedoutBeans "
+ " finished after removing " + count + " idle beans");
}
}
/**
* This method picks idle items from a cache which does not have a sorted
* LRU list
* NRU cache at light loads and FIFO caches do not maintain a LRU list and
* hence they have to scan the entire cache and select victims
**/
public void trimUnSortedTimedoutItems(int maxCount) {
int maxIndex = buckets.length;
long idleThreshold = System.currentTimeMillis() - timeout;
ArrayList victims = new ArrayList();
int sz = 0;
int totalSize = 0;
if(_logger.isLoggable(Level.FINE)) {
_logger.log(Level.FINE,
"[" + cacheName + "]: TrimUnsortedTimedoutBeans started...");
}
// Go through each bucket in the cache and if there are entries in that
// bucket scan them and select victims
for (int index = 0; index < maxIndex ; index++) {
if (buckets[index] != null) {
synchronized (bucketLocks[index]) {
for (CacheItem item = buckets[index]; item != null;
item = item.getNext()) {
StatefulEJBContext ctx =
(StatefulEJBContext) item.getValue();
//Note ctx can be null if bean is in BEING_REFRESHED state
if ((ctx != null) &&
(ctx.getLastAccessTime() <= idleThreshold) &&
ctx.canBePassivated()) {
LruCacheItem litem = (LruCacheItem)item;
synchronized (this) {
if (currentCacheState != STATE_RUNNING) {
_logger.log(Level.WARNING, EXITING_TRIM_UNSORTED_TIMEDOUT_BEANS,
new Object[]{cacheName, currentCacheState});
break;
}
if (!litem.isTrimmed()) {
itemRemoved(litem);
litem.setTrimmed(true);
victims.add(litem);
}
}
}
}
}
// Check and see if we have collected enough victims
// to start a cleaner task
sz = victims.size();
if (sz >= container.getPassivationBatchCount()) {
trimSelectedVictims(victims);
totalSize += sz;
victims.clear();
}
}
}
sz = victims.size();
if (sz > 0) {
trimSelectedVictims(victims);
totalSize += sz;
}
if(_logger.isLoggable(Level.FINE)) {
_logger.log(Level.FINE, "[" + cacheName + "]: TrimUnsortedTimedoutBeans "
+ " finished after removing " + totalSize + " idle beans");
}
}
public int getNumVictimsAccessed() {
return numVictimsAccessed;
}
protected CacheItem createItem(int hashCode, Object sessionKey,
Object value, int size)
{
return new LruSessionCacheItem(hashCode, sessionKey, value, size);
}
//*Class for LruSessionCacheItem
protected static class LruSessionCacheItem
extends LruCacheItem
{
protected byte waitCount;
protected byte cacheItemState = CACHE_ITEM_VALID;
protected LruSessionCacheItem(int hashCode, Object key, Object value,
int size)
{
super(hashCode, key, value, size);
this.cacheItemState = CACHE_ITEM_VALID;
}
protected LruSessionCacheItem(int hashCode, Object key, Object value,
int size, byte state)
{
super(hashCode, key, value, size);
this.cacheItemState = state;
}
}
public void setConfigData(String configData) {
this.configData = configData;
}
//Implementation of EjbCacheStatsProviderDelegate
public void appendStats(StringBuilder sbuf) {
sbuf.append("[Cache: ")
.append("Size=").append(entryCount).append("; ")
.append("HitCount=").append(hitCount).append("; ")
.append("MissCount=").append(missCount).append("; ")
.append("Passivations=").append(getNumPassivations()).append("; ");
if (configData != null) {
sbuf.append(configData);
}
sbuf.append("]");
}
public int getCacheHits() {
return hitCount;
}
public int getCacheMisses() {
return missCount;
}
public int getNumBeansInCache() {
return entryCount;
}
public int getNumExpiredSessionsRemoved() {
/*return (sfsbStoreMonitor == null)
? 0 : sfsbStoreMonitor.getNumExpiredSessionsRemoved(); */
return 0;
}
public int getNumPassivationErrors() {
/* return (sfsbStoreMonitor == null)
? 0 : sfsbStoreMonitor.getNumPassivationErrors(); */
return 0;
}
public int getNumPassivations() {
/* return (sfsbStoreMonitor == null)
? 0 : sfsbStoreMonitor.getNumPassivations(); */
return 0;
}
public int getNumPassivationSuccess() {
/*return (sfsbStoreMonitor == null)
? 0 : sfsbStoreMonitor.getNumPassivationSuccess(); */
return 0;
}
public void setMaxCacheSize(int val) {
this.confMaxCacheSize = val;
}
public int getMaxCacheSize() {
return confMaxCacheSize;
}
}
