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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.
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/**
 * 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 org.terracotta.modules.ehcache.store.nonstop;

import net.sf.ehcache.CacheException;
import net.sf.ehcache.Element;
import net.sf.ehcache.Status;
import net.sf.ehcache.config.CacheConfiguration;
import net.sf.ehcache.constructs.nonstop.NonStopCacheException;
import net.sf.ehcache.search.Attribute;
import net.sf.ehcache.search.Results;
import net.sf.ehcache.search.attribute.AttributeExtractor;
import net.sf.ehcache.store.ElementValueComparator;
import net.sf.ehcache.store.Policy;
import net.sf.ehcache.store.StoreListener;
import net.sf.ehcache.store.StoreQuery;
import net.sf.ehcache.store.TerracottaStore;
import net.sf.ehcache.writer.CacheWriterManager;
import net.sf.ehcache.writer.writebehind.WriteBehind;

import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * Implementation of {@link TerracottaStore} that throws {@link NonStopCacheException} for all operations.
 * 
 * @author Abhishek Sanoujam
 */
public final class ExceptionOnTimeoutStore implements TerracottaStore {

  /**
   * the singleton instance
   */
  private static final ExceptionOnTimeoutStore INSTANCE = new ExceptionOnTimeoutStore();

  /**
   * private constructor
   */
  private ExceptionOnTimeoutStore() {
    //
  }

  /**
   * returns the singleton instance
   */
  public static ExceptionOnTimeoutStore getInstance() {
    return INSTANCE;
  }

    /**
   * {@inheritDoc}.
   * 
   * Throws {@link NonStopCacheException}
   */
  @Override
  public Element get(final Object key) throws IllegalStateException, CacheException {
    throw new NonStopCacheException("get timed out");
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public Element getQuiet(final Object key) throws IllegalStateException, CacheException {
    throw new NonStopCacheException("getQuiet timed out");
  }

  /**
   * {@inheritDoc}
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public Map getAllQuiet(Collection keys) {
    throw new NonStopCacheException("getAllQuiet for '" + keys.size() + "' keys timed out");
  }

  /**
   * {@inheritDoc}
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public Map getAll(Collection keys) {
    throw new NonStopCacheException("getAll for '" + keys.size() + "' keys timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public List getKeys() throws IllegalStateException, CacheException {
    throw new NonStopCacheException("getKeys timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public boolean put(final Element element) throws IllegalArgumentException, IllegalStateException, CacheException {
    throw new NonStopCacheException("put timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public void putAll(final Collection elements) throws CacheException {
    throw new NonStopCacheException("putAll for " + elements.size() + " elements timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public Element remove(final Object key) throws IllegalStateException {
    throw new NonStopCacheException("remove timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public void removeAll(final Collection keys) throws IllegalStateException {
    throw new NonStopCacheException("removeAll for " + keys.size() + "  keys timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public void removeAll() throws IllegalStateException, CacheException {
    throw new NonStopCacheException("removeAll timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public void flush() throws IllegalStateException, CacheException {
    throw new NonStopCacheException("flush timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public Object getInternalContext() {
    throw new NonStopCacheException("getInternalContext timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public int getSize() throws IllegalStateException, CacheException {
    throw new NonStopCacheException("getSize timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public Element putIfAbsent(Element element) throws NullPointerException {
    throw new NonStopCacheException("putIfAbsent timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public Element replace(Element element) throws NullPointerException {
    throw new NonStopCacheException("replace timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public void addStoreListener(StoreListener listener) {
    throw new NonStopCacheException("addStoreListener timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public boolean bufferFull() {
    throw new NonStopCacheException("bufferFull timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public boolean containsKey(Object key) {
    throw new NonStopCacheException("containsKey timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public boolean containsKeyInMemory(Object key) {
    throw new NonStopCacheException("containsKeyInMemory timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public boolean containsKeyOffHeap(Object key) {
    throw new NonStopCacheException("containsKeyOffHeap timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public boolean containsKeyOnDisk(Object key) {
    throw new NonStopCacheException("containsKeyOnDisk timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public void dispose() {
    throw new NonStopCacheException("dispose timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public Results executeQuery(StoreQuery query) {
    throw new NonStopCacheException("executeQuery timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public void expireElements() {
    throw new NonStopCacheException("expireElements timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public Policy getInMemoryEvictionPolicy() {
    throw new NonStopCacheException("getInMemoryEvictionPolicy timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public int getInMemorySize() {
    throw new NonStopCacheException("getInMemorySize timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public long getInMemorySizeInBytes() {
    throw new NonStopCacheException("getInMemorySizeInBytes timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public Object getMBean() {
    throw new NonStopCacheException("getMBean timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public int getOffHeapSize() {
    throw new NonStopCacheException("getOffHeapSize timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public long getOffHeapSizeInBytes() {
    throw new NonStopCacheException("getOffHeapSizeInBytes timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public int getOnDiskSize() {
    throw new NonStopCacheException("getOnDiskSize timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public long getOnDiskSizeInBytes() {
    throw new NonStopCacheException("getOnDiskSizeInBytes timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public boolean hasAbortedSizeOf() {
    throw new NonStopCacheException("hasAbortedSizeOf timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public Status getStatus() {
    throw new NonStopCacheException("getStatus timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public int getTerracottaClusteredSize() {
    throw new NonStopCacheException("getTerracottaClusteredSize timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public boolean isCacheCoherent() {
    throw new NonStopCacheException("isCacheCoherent timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public boolean isClusterCoherent() {
    throw new NonStopCacheException("isClusterCoherent timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public boolean isNodeCoherent() {
    throw new NonStopCacheException("isNodeCoherent timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public boolean putWithWriter(Element element, CacheWriterManager writerManager) throws CacheException {
    throw new NonStopCacheException("putWithWriter timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public Element removeElement(Element element, ElementValueComparator comparator) throws NullPointerException {
    throw new NonStopCacheException("removeElement timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public void removeStoreListener(StoreListener listener) {
    throw new NonStopCacheException("removeStoreListener timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public Element removeWithWriter(Object key, CacheWriterManager writerManager) throws CacheException {
    throw new NonStopCacheException("removeWithWriter timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public boolean replace(Element old, Element element, ElementValueComparator comparator) throws NullPointerException,
      IllegalArgumentException {
    throw new NonStopCacheException("replace timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public void setAttributeExtractors(Map extractors) {
    throw new NonStopCacheException("setAttributeExtractors timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public void setInMemoryEvictionPolicy(Policy policy) {
    throw new NonStopCacheException("setInMemoryEvictionPolicy timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public void setNodeCoherent(boolean coherent) throws UnsupportedOperationException {
    throw new NonStopCacheException("setNodeCoherent timed out");
  }

  /**
   * {@inheritDoc}.
   * 

   * Throws {@link NonStopCacheException}
   */
  @Override
  public void waitUntilClusterCoherent() throws UnsupportedOperationException {
    throw new NonStopCacheException("waitUntilClusterCoherent timed out");
  }

  @Override
  public Set getSearchAttributes() {
    throw new NonStopCacheException("getSearchAttributes timed out");
  }

  /**
   * {@inheritDoc}.
   * 
   * Throws {@link NonStopCacheException}
   */
  @Override
  public  Attribute getSearchAttribute(String attributeName) {
    throw new NonStopCacheException("getSearchAttribute timed out");
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public Set getLocalKeys() {
    throw new NonStopCacheException("getLocalKeys() timed out");
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public CacheConfiguration.TransactionalMode getTransactionalMode() {
    throw new NonStopCacheException("getTransactionalMode() timed out");
  }

  /**
   * {@inheritDoc}
   */
  public Element unlockedGet(Object key) {
    throw new NonStopCacheException("unlockedGet() timed out");
  }

  /**
   * {@inheritDoc}
   */
  public Element unlockedGetQuiet(Object key) {
    throw new NonStopCacheException("unlockedGetQuiet() timed out");
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public Element unsafeGet(Object key) {
    throw new NonStopCacheException("unsafeGet() timed out");
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void quickClear() {
    throw new NonStopCacheException("quickClear() timed out");
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public int quickSize() {
    throw new NonStopCacheException("quickSize() timed out");
  }

  /**
   * {@inheritDoc}
   */
  public Element unsafeGetQuiet(Object key) {
    throw new NonStopCacheException("unsafeGetQuiet() timed out");
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void recalculateSize(Object key) {
    throw new UnsupportedOperationException();
  }

  @Override
  public WriteBehind createWriteBehind() {
    throw new UnsupportedOperationException();
  }

  @Override
  public void notifyCacheEventListenersChanged() {
    throw new NonStopCacheException("notifyCacheEventListenersChanged() timed out");
  }
}