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Ehcache is an open source, standards-based cache used to boost performance,
offload the database and simplify scalability. Ehcache is robust, proven and full-featured and
this has made it the most widely-used Java-based cache.
/**
* Copyright Terracotta, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.sf.ehcache.store;
import net.sf.ehcache.CacheException;
import net.sf.ehcache.Element;
import net.sf.ehcache.Status;
import net.sf.ehcache.concurrent.StripedReadWriteLock;
import net.sf.ehcache.concurrent.StripedReadWriteLockSync;
import net.sf.ehcache.config.CacheConfiguration;
import net.sf.ehcache.search.Attribute;
import net.sf.ehcache.search.Results;
import net.sf.ehcache.search.SearchException;
import net.sf.ehcache.search.attribute.AttributeExtractor;
import net.sf.ehcache.store.disk.DiskStore;
import net.sf.ehcache.terracotta.TerracottaNotRunningException;
import net.sf.ehcache.writer.CacheWriterManager;
import java.io.IOException;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import org.terracotta.context.annotations.ContextChild;
/**
* The one store to rule them all!
*
* @author Alex Snaps
*/
public class CacheStore implements Store {
private static final int DEFAULT_LOCK_STRIPE_COUNT = 128;
@ContextChild
private final CachingTier cachingTier;
@ContextChild
private final AuthoritativeTier authoritativeTier;
@Deprecated
private final StripedReadWriteLock masterLocks;
@Deprecated
private final CacheConfiguration cacheConfiguration;
private volatile Status status;
private final ReadWriteLock daLock = new ReentrantReadWriteLock();
/**
* Constructor :P
*
* @param cache the cache fronting the authority
* @param authority the authority fronted by the cache
*/
public CacheStore(final CachingTier cache, final AuthoritativeTier authority) {
this(cache, authority, null);
}
/**
* Constructor :P
*
* @param cache the cache fronting the authority
* @param authority the authority fronted by the cache
* @param cacheConfiguration OMFG! NOOOOOooooo.....
*/
@Deprecated
public CacheStore(final CachingTier cache, final AuthoritativeTier authority, CacheConfiguration cacheConfiguration) {
if (cache == null || authority == null) {
throw new NullPointerException();
}
this.cachingTier = cache;
this.cacheConfiguration = cacheConfiguration;
this.cachingTier.addListener(new CachingTier.Listener() {
@Override
public void evicted(final Object key, final Element value) {
authority.flush(value);
}
});
this.authoritativeTier = authority;
if (authority instanceof StripedReadWriteLockProvider) {
masterLocks = ((StripedReadWriteLockProvider)authority).createStripedReadWriteLock();
} else {
masterLocks = new StripedReadWriteLockSync(DEFAULT_LOCK_STRIPE_COUNT);
}
this.status = Status.STATUS_ALIVE;
}
@Override
public void addStoreListener(final StoreListener listener) {
authoritativeTier.addStoreListener(listener);
}
@Override
public void removeStoreListener(final StoreListener listener) {
authoritativeTier.removeStoreListener(listener);
}
@Override
public boolean put(final Element element) throws CacheException {
if (cachingTier.remove(element.getObjectKey()) != null || cachingTier.loadOnPut()) {
try {
final boolean[] hack = new boolean[1];
if (cachingTier.get(element.getObjectKey(), new Callable() {
@Override
public Element call() throws Exception {
final Lock lock = daLock.readLock();
lock.lock();
try {
hack[0] = authoritativeTier.putFaulted(element);
return element;
} finally {
lock.unlock();
}
}
}, false) == element) {
return hack[0];
}
} catch (Throwable e) {
cachingTier.remove(element.getObjectKey());
if (e instanceof RuntimeException) {
throw (RuntimeException)e;
}
throw new CacheException(e);
}
}
try {
return authoritativeTier.put(element);
} catch (RuntimeException e) {
authoritativeTier.flush(element);
throw e;
} finally {
cachingTier.remove(element.getObjectKey());
}
}
@Override
public void putAll(final Collection elements) throws CacheException {
for (Element element : elements) {
put(element);
}
}
@Override
public boolean putWithWriter(final Element element, final CacheWriterManager writerManager) throws CacheException {
try {
return authoritativeTier.putWithWriter(element, writerManager);
} finally {
cachingTier.remove(element.getObjectKey());
}
}
@Override
public Element get(final Object key) {
if (key == null) {
return null;
}
return cachingTier.get(key, new Callable() {
@Override
public Element call() throws Exception {
final Lock lock = daLock.readLock();
lock.lock();
try {
return authoritativeTier.fault(key, true);
} finally {
lock.unlock();
}
}
}, true);
}
@Override
public Element getQuiet(final Object key) {
if (key == null) {
return null;
}
return cachingTier.get(key, new Callable() {
@Override
public Element call() throws Exception {
final Lock lock = daLock.readLock();
lock.lock();
try {
return authoritativeTier.fault(key, false);
} finally {
lock.unlock();
}
}
}, false);
}
@Override
public List getKeys() {
return authoritativeTier.getKeys();
}
@Override
public Element remove(final Object key) {
if (key == null) {
return null;
}
try {
return authoritativeTier.remove(key);
} finally {
cachingTier.remove(key);
}
}
@Override
public void removeAll(final Collection keys) {
for (Object key : keys) {
remove(key);
}
}
@Override
public Element removeWithWriter(final Object key, final CacheWriterManager writerManager) throws CacheException {
try {
return authoritativeTier.removeWithWriter(key, writerManager);
} finally {
cachingTier.remove(key);
}
}
@Override
public void removeAll() throws CacheException {
final Lock lock = daLock.writeLock();
lock.lock();
try {
authoritativeTier.removeAll();
} finally {
cachingTier.clear();
lock.unlock();
}
}
@Override
public Element putIfAbsent(final Element element) throws NullPointerException {
Element previous = null;
try {
previous = authoritativeTier.putIfAbsent(element);
} finally {
if (previous == null) {
cachingTier.remove(element.getObjectKey());
}
}
return previous;
}
@Override
public Element removeElement(final Element element, final ElementValueComparator comparator) throws NullPointerException {
final Element removedElement;
try {
removedElement = authoritativeTier.removeElement(element, comparator);
} finally {
cachingTier.remove(element.getObjectKey());
}
return removedElement;
}
@Override
public boolean replace(final Element old, final Element element, final ElementValueComparator comparator)
throws NullPointerException, IllegalArgumentException {
boolean replaced = true;
try {
replaced = authoritativeTier.replace(old, element, comparator);
} finally {
if (replaced) {
cachingTier.remove(element.getObjectKey());
}
}
return replaced;
}
@Override
public Element replace(final Element element) throws NullPointerException {
Element previous = null;
try {
previous = authoritativeTier.replace(element);
} catch (Throwable e) {
cachingTier.remove(previous.getObjectKey());
throwUp(e);
} finally {
if (previous != null) {
cachingTier.remove(previous.getObjectKey());
}
}
return previous;
}
private void throwUp(final Throwable e) {
if (e instanceof RuntimeException) {
throw ((RuntimeException)e);
} else if (e instanceof Error) {
throw ((Error)e);
}
throw new CacheException(e);
}
@Override
public synchronized void dispose() {
if (status == Status.STATUS_SHUTDOWN) {
return;
}
if (cacheConfiguration != null && cacheConfiguration.isClearOnFlush()) {
cachingTier.clear();
}
authoritativeTier.dispose();
status = Status.STATUS_SHUTDOWN;
}
@Override
public int getSize() {
return authoritativeTier.getSize();
}
@Override
public int getInMemorySize() {
return cachingTier.getInMemorySize() + authoritativeTier.getInMemorySize();
}
@Override
public int getOffHeapSize() {
return cachingTier.getOffHeapSize() + authoritativeTier.getOffHeapSize();
}
@Override
public int getOnDiskSize() {
// As of now... a cache will never hold anything on disk!
return authoritativeTier.getOnDiskSize();
}
@Override
public int getTerracottaClusteredSize() {
throw new UnsupportedOperationException("No such thing for non clustered stores!");
}
@Override
public long getInMemorySizeInBytes() {
// TODO delegate to pool accessors here ??
return cachingTier.getInMemorySizeInBytes() + authoritativeTier.getInMemorySizeInBytes();
}
@Override
public long getOffHeapSizeInBytes() {
// TODO delegate to pool accessors here ??
return cachingTier.getOffHeapSizeInBytes() + authoritativeTier.getOffHeapSizeInBytes();
}
@Override
public long getOnDiskSizeInBytes() {
// TODO delegate to pool accessors here ??
return cachingTier.getOnDiskSizeInBytes() + authoritativeTier.getOnDiskSizeInBytes();
}
@Override
public boolean hasAbortedSizeOf() {
// TODO delegate to pool accessors here ??
return authoritativeTier.hasAbortedSizeOf();
}
@Override
public Status getStatus() {
return status;
}
@Override
public boolean containsKey(final Object key) {
return authoritativeTier.containsKey(key);
}
@Override
@Deprecated
public boolean containsKeyOnDisk(final Object key) {
return authoritativeTier.containsKeyOnDisk(key);
}
@Override
@Deprecated
public boolean containsKeyOffHeap(final Object key) {
return authoritativeTier.containsKeyOffHeap(key);
}
@Override
@Deprecated
public boolean containsKeyInMemory(final Object key) {
return cachingTier.contains(key);
}
@Override
public void expireElements() {
authoritativeTier.expireElements();
}
@Override
public void flush() throws IOException {
if (authoritativeTier instanceof DiskStore && cacheConfiguration != null && cacheConfiguration.isClearOnFlush()) {
final Lock lock = daLock.writeLock();
lock.lock();
try {
cachingTier.clear();
((DiskStore)authoritativeTier).clearFaultedBit();
} finally {
lock.unlock();
}
} else {
authoritativeTier.flush();
}
}
@Override
public boolean bufferFull() {
return authoritativeTier.bufferFull();
}
@Override
public Policy getInMemoryEvictionPolicy() {
return cachingTier.getEvictionPolicy();
}
@Override
public void setInMemoryEvictionPolicy(final Policy policy) {
cachingTier.setEvictionPolicy(policy);
}
@Override
@Deprecated
public Object getInternalContext() {
return masterLocks;
}
@Override
public boolean isCacheCoherent() {
throw new UnsupportedOperationException("No such thing for non clustered stores!");
}
@Override
public boolean isClusterCoherent() throws TerracottaNotRunningException {
throw new UnsupportedOperationException("No such thing for non clustered stores!");
}
@Override
public boolean isNodeCoherent() throws TerracottaNotRunningException {
throw new UnsupportedOperationException("No such thing for non clustered stores!");
}
@Override
public void setNodeCoherent(final boolean coherent) throws UnsupportedOperationException, TerracottaNotRunningException {
throw new UnsupportedOperationException("No such thing for non clustered stores!");
}
@Override
public void waitUntilClusterCoherent() throws UnsupportedOperationException, TerracottaNotRunningException, InterruptedException {
throw new UnsupportedOperationException("No such thing for non clustered stores!");
}
@Override
public Object getMBean() {
return authoritativeTier.getMBean();
}
@Override
public void setAttributeExtractors(final Map extractors) {
authoritativeTier.setAttributeExtractors(extractors);
}
@Override
public Results executeQuery(final StoreQuery query) throws SearchException {
return authoritativeTier.executeQuery(query);
}
@Override
public Attribute getSearchAttribute(final String attributeName) {
return authoritativeTier.getSearchAttribute(attributeName);
}
@Override
public Set getSearchAttributes() {
return authoritativeTier.getSearchAttributes();
}
// TODO this is probably not optimum
@Override
public Map getAllQuiet(final Collection keys) {
final Map result = new HashMap();
for (Object key : keys) {
result.put(key, getQuiet(key));
}
return result;
}
// TODO this is probably not optimum
@Override
public Map getAll(final Collection keys) {
final Map result = new HashMap();
for (Object key : keys) {
result.put(key, get(key));
}
return result;
}
@Override
public void recalculateSize(final Object key) {
cachingTier.recalculateSize(key);
}
}
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