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This is the ehcache core module. Pair it with other modules for added functionality.
/**
* Copyright 2003-2010 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.transaction;
import java.io.IOException;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import java.util.Set;
import net.sf.ehcache.CacheException;
import net.sf.ehcache.Element;
import net.sf.ehcache.Status;
import net.sf.ehcache.config.InvalidConfigurationException;
import net.sf.ehcache.search.Attribute;
import net.sf.ehcache.search.Result;
import net.sf.ehcache.search.Results;
import net.sf.ehcache.search.SearchException;
import net.sf.ehcache.search.attribute.AttributeExtractor;
import net.sf.ehcache.store.AbstractStore;
import net.sf.ehcache.store.Policy;
import net.sf.ehcache.store.Store;
import net.sf.ehcache.store.StoreQuery;
import net.sf.ehcache.store.TerracottaStore;
import net.sf.ehcache.store.compound.ReadWriteCopyStrategy;
import net.sf.ehcache.terracotta.TerracottaNotRunningException;
/**
* Abstract transactional store which provides implementation of all non-transactional methods
*
* @author Ludovic Orban
*/
public abstract class AbstractTransactionStore extends AbstractStore implements TerracottaStore {
/**
* The underlying store wrapped by this store
*/
protected final Store underlyingStore;
/**
* The copy strategy for this store
*/
protected final ReadWriteCopyStrategy copyStrategy;
/**
* Constructor
* @param underlyingStore the underlying store
*/
protected AbstractTransactionStore(Store underlyingStore, ReadWriteCopyStrategy copyStrategy) {
this.underlyingStore = underlyingStore;
this.copyStrategy = copyStrategy;
}
/**
* Copy element for read operation
*
* @param element
* @return copied element
*/
protected Element copyElementForRead(Element element) {
return copyStrategy.copyForRead(element);
}
/**
* Copy element for write operation
*
* @param element
* @return copied element
*/
protected Element copyElementForWrite(Element element) {
return copyStrategy.copyForWrite(element);
}
/**
* {@inheritDoc}
*/
@Override
public Results executeQuery(StoreQuery query) {
Results results = underlyingStore.executeQuery(query);
if (results instanceof TxSearchResults) {
// don't re-wrap needlessly
return results;
}
return new TxSearchResults(underlyingStore.executeQuery(query));
}
/* non-transactional methods */
/**
* {@inheritDoc}
*/
public int getInMemorySize() {
return underlyingStore.getInMemorySize();
}
/**
* {@inheritDoc}
*/
public int getOffHeapSize() {
return underlyingStore.getOffHeapSize();
}
/**
* {@inheritDoc}
*/
public int getOnDiskSize() {
return underlyingStore.getOnDiskSize();
}
/**
* {@inheritDoc}
*/
public long getInMemorySizeInBytes() {
return underlyingStore.getInMemorySizeInBytes();
}
/**
* {@inheritDoc}
*/
public long getOffHeapSizeInBytes() {
return underlyingStore.getOffHeapSizeInBytes();
}
/**
* {@inheritDoc}
*/
public long getOnDiskSizeInBytes() {
return underlyingStore.getOnDiskSizeInBytes();
}
/**
* {@inheritDoc}
*/
public boolean containsKeyOnDisk(Object key) {
return underlyingStore.containsKeyOnDisk(key);
}
/**
* {@inheritDoc}
*/
public boolean containsKeyOffHeap(Object key) {
return underlyingStore.containsKeyOffHeap(key);
}
/**
* {@inheritDoc}
*/
public boolean containsKeyInMemory(Object key) {
return underlyingStore.containsKeyInMemory(key);
}
/**
* {@inheritDoc}
*/
public void dispose() {
underlyingStore.dispose();
}
/**
* {@inheritDoc}
*/
public Status getStatus() {
return underlyingStore.getStatus();
}
/**
* {@inheritDoc}
*/
public void expireElements() {
underlyingStore.expireElements();
}
/**
* {@inheritDoc}
*/
public void flush() throws IOException {
underlyingStore.flush();
}
/**
* {@inheritDoc}
*/
public boolean bufferFull() {
return underlyingStore.bufferFull();
}
/**
* {@inheritDoc}
*/
public Policy getInMemoryEvictionPolicy() {
return underlyingStore.getInMemoryEvictionPolicy();
}
/**
* {@inheritDoc}
*/
public void setInMemoryEvictionPolicy(Policy policy) {
underlyingStore.setInMemoryEvictionPolicy(policy);
}
/**
* {@inheritDoc}
*/
public Object getInternalContext() {
return underlyingStore.getInternalContext();
}
/**
* {@inheritDoc}
*/
public Object getMBean() {
return underlyingStore.getMBean();
}
/**
* {@inheritDoc}
*/
@Override
public void setNodeCoherent(boolean coherent) {
if (!coherent) {
throw new InvalidConfigurationException("a transactional cache cannot be incoherent");
}
underlyingStore.setNodeCoherent(coherent);
}
/**
* {@inheritDoc}
*
* @see net.sf.ehcache.store.Store#isNodeCoherent()
*/
@Override
public boolean isNodeCoherent() {
return underlyingStore.isNodeCoherent();
}
/**
* {@inheritDoc}
*
* @see net.sf.ehcache.store.Store#isCacheCoherent()
*/
@Override
public boolean isCacheCoherent() {
return underlyingStore.isCacheCoherent();
}
/**
* {@inheritDoc}
*
* @see net.sf.ehcache.store.Store#isClusterCoherent()
*/
@Override
public boolean isClusterCoherent() {
return underlyingStore.isClusterCoherent();
}
/**
* {@inheritDoc}
* @throws InterruptedException
* @throws UnsupportedOperationException
* @throws TerracottaNotRunningException
*/
@Override
public void waitUntilClusterCoherent() throws TerracottaNotRunningException, UnsupportedOperationException, InterruptedException {
underlyingStore.waitUntilClusterCoherent();
}
/**
* {@inheritDoc}
*/
@Override
public void setAttributeExtractors(Map extractors) {
underlyingStore.setAttributeExtractors(extractors);
}
/**
* {@inheritDoc}
*/
@Override
public Attribute getSearchAttribute(String attributeName) throws CacheException {
return underlyingStore.getSearchAttribute(attributeName);
}
/* TerracottaStore methods */
/**
* {@inheritDoc}
*/
public Element unsafeGet(Object key) {
if (underlyingStore instanceof TerracottaStore) {
return ((TerracottaStore) underlyingStore).unsafeGet(key);
}
throw new CacheException("underlying store is not an instance of TerracottaStore");
}
/**
* {@inheritDoc}
*/
public Element unsafeGetQuiet(Object key) {
if (underlyingStore instanceof TerracottaStore) {
return ((TerracottaStore) underlyingStore).unsafeGetQuiet(key);
}
throw new CacheException("underlying store is not an instance of TerracottaStore");
}
/**
* {@inheritDoc}
*/
public Element unlockedGet(Object key) {
if (underlyingStore instanceof TerracottaStore) {
return ((TerracottaStore) underlyingStore).unlockedGet(key);
}
throw new CacheException("underlying store is not an instance of TerracottaStore");
}
/**
* {@inheritDoc}
*/
public Element unlockedGetQuiet(Object key) {
if (underlyingStore instanceof TerracottaStore) {
return ((TerracottaStore) underlyingStore).unlockedGetQuiet(key);
}
throw new CacheException("underlying store is not an instance of TerracottaStore");
}
/**
* {@inheritDoc}
*/
public Set getLocalKeys() {
if (underlyingStore instanceof TerracottaStore) {
return ((TerracottaStore) underlyingStore).getLocalKeys();
}
throw new CacheException("underlying store is not an instance of TerracottaStore");
}
/**
* Wrap search results so that Result.getValue() can use copy strategy
*
* @author teck
*/
private class TxSearchResults implements Results {
private final Results results;
TxSearchResults(Results results) {
this.results = results;
}
public void discard() {
results.discard();
}
public List all() throws SearchException {
return new TxResultsList(results.all());
}
public List range(int start, int count) throws SearchException, IndexOutOfBoundsException {
return new TxResultsList(results.range(start, count));
}
public int size() {
return results.size();
}
public boolean hasKeys() {
return results.hasKeys();
}
public boolean hasValues() {
return results.hasValues();
}
public boolean hasAttributes() {
return results.hasAttributes();
}
public boolean hasAggregators() {
return results.hasAggregators();
}
}
/**
* Wrap search results so that Result.getValue() can use copy strategy
*
* @author teck
*/
private class TxResultsList implements List {
private final List results;
TxResultsList(List results) {
this.results = results;
}
public int size() {
return results.size();
}
public boolean isEmpty() {
return results.isEmpty();
}
public boolean contains(Object o) {
return results.contains(unwrapIfNeeded(o));
}
public Iterator iterator() {
return new TxResultsIterator(results.iterator());
}
public Object[] toArray() {
return wrapResultArray(results.toArray());
}
public T[] toArray(T[] a) {
return wrapResultArray(results.toArray(a));
}
private T[] wrapResultArray(T[] array) {
for (int i = 0; i < array.length; i++) {
array[i] = (T) new TxResult((Result) array[i]);
}
return array;
}
public boolean add(Result o) {
throw new UnsupportedOperationException();
}
public boolean remove(Object o) {
throw new UnsupportedOperationException();
}
public boolean containsAll(Collection c) {
for (Object o : c) {
if (!contains(o)) {
return false;
}
}
return true;
}
public boolean addAll(Collection c) {
throw new UnsupportedOperationException();
}
public boolean addAll(int index, Collection c) {
throw new UnsupportedOperationException();
}
public boolean removeAll(Collection c) {
throw new UnsupportedOperationException();
}
public boolean retainAll(Collection c) {
throw new UnsupportedOperationException();
}
public void clear() {
throw new UnsupportedOperationException();
}
@Override
public boolean equals(Object o) {
if (o == this) {
return true;
}
if (o == null) {
return false;
}
if (o instanceof List) {
List other = (List) o;
if (size() != other.size()) {
return false;
}
Iterator thisIter = results.iterator();
Iterator otherIter = other.iterator();
while (thisIter.hasNext()) {
Object otherItem = unwrapIfNeeded(otherIter.next());
Object thisItem = thisIter.next();
if (otherItem == null && thisItem == null) {
continue;
}
if (otherItem != null && thisItem == null) {
return false;
}
if (thisItem != null && otherItem == null) {
return false;
}
if (!thisItem.equals(otherItem)) {
return false;
}
}
return true;
}
return false;
}
@Override
public int hashCode() {
return results.hashCode();
}
public Result get(int index) {
return new TxResult(results.get(index));
}
public Result set(int index, Result element) {
throw new UnsupportedOperationException();
}
public void add(int index, Result element) {
throw new UnsupportedOperationException();
}
public Result remove(int index) {
throw new UnsupportedOperationException();
}
public int indexOf(Object o) {
return results.indexOf(unwrapIfNeeded(o));
}
public int lastIndexOf(Object o) {
return results.lastIndexOf(unwrapIfNeeded(o));
}
public ListIterator listIterator() {
return new TxResultsListIterator(results.listIterator());
}
public ListIterator listIterator(int index) {
return new TxResultsListIterator(results.listIterator(index));
}
public List subList(int fromIndex, int toIndex) {
return new TxResultsList(results.subList(fromIndex, toIndex));
}
private Object unwrapIfNeeded(Object o) {
if (o instanceof TxResult) {
return ((TxResult) o).getUnderylingResult();
}
return o;
}
}
/**
* Wrap search results so that Result.getValue() can use copy strategy
*
* @author teck
*/
private class TxResult implements Result {
private final Result result;
TxResult(Result result) {
this.result = result;
}
Result getUnderylingResult() {
return result;
}
public Object getKey() throws SearchException {
return result.getKey();
}
public Object getValue() throws SearchException {
return copyElementForRead(new Element(result.getKey(), result.getValue())).getObjectValue();
}
public T getAttribute(Attribute attribute) throws SearchException {
return result.getAttribute(attribute);
}
public List