/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.jackrabbit.jcr2spi;
import java.util.Map;
import javax.jcr.Item;
import javax.jcr.RepositoryException;
import org.apache.commons.collections.map.LRUMap;
import org.apache.jackrabbit.jcr2spi.state.ItemState;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* <code>ItemCacheImpl</code>...
*/
public class ItemCacheImpl implements ItemCache {
private static Logger log = LoggerFactory.getLogger(ItemCacheImpl.class);
private final Map<ItemState, Item> cache;
@SuppressWarnings("unchecked")
ItemCacheImpl(int maxSize) {
cache = new LRUMap(maxSize);
}
//----------------------------------------------------------< ItemCache >---
/**
* @see ItemCache#getItem(ItemState)
*/
public Item getItem(ItemState state) {
return cache.get(state);
}
/**
* @see ItemCache#clear()
*/
public void clear() {
cache.clear();
}
//----------------------------------------------< ItemLifeCycleListener >---
/**
* @see ItemLifeCycleListener#itemCreated(Item)
*/
public void itemCreated(Item item) {
if (!(item instanceof ItemImpl)) {
String msg = "Incompatible Item object: " + ItemImpl.class.getName() + " expected.";
throw new IllegalArgumentException(msg);
}
if (log.isDebugEnabled()) {
log.debug("created item " + item);
}
// add instance to cache
cacheItem(((ItemImpl)item).getItemState(), item);
}
public void itemUpdated(Item item, boolean modified) {
if (!(item instanceof ItemImpl)) {
String msg = "Incompatible Item object: " + ItemImpl.class.getName() + " expected.";
throw new IllegalArgumentException(msg);
}
if (log.isDebugEnabled()) {
log.debug("update item " + item);
}
ItemState state = ((ItemImpl) item).getItemState();
// touch the corresponding cache entry
Item cacheEntry = getItem(state);
if (cacheEntry == null) {
// .. or add the item to the cache, if not present yet.
cacheItem(state, item);
}
}
/**
* @see ItemLifeCycleListener#itemDestroyed(Item)
*/
public void itemDestroyed(Item item) {
if (!(item instanceof ItemImpl)) {
String msg = "Incompatible Item object: " + ItemImpl.class.getName() + " expected.";
throw new IllegalArgumentException(msg);
}
if (log.isDebugEnabled()) {
log.debug("destroyed item " + item);
}
// we're no longer interested in this item
((ItemImpl)item).removeLifeCycleListener(this);
// remove instance from cache
evictItem(((ItemImpl)item).getItemState());
}
//-------------------------------------------------< item cache methods >---
/**
* Puts the reference of an item in the cache with
* the item's path as the key.
*
* @param item the item to cache
*/
private synchronized void cacheItem(ItemState state, Item item) {
if (cache.containsKey(state)) {
log.warn("overwriting cached item " + state);
}
if (log.isDebugEnabled()) {
log.debug("caching item " + state);
}
cache.put(state, item);
}
/**
* Removes a cache entry for a specific item.
*
* @param itemState state of the item to remove from the cache
*/
private synchronized void evictItem(ItemState itemState) {
if (log.isDebugEnabled()) {
log.debug("removing item " + itemState + " from cache");
}
cache.remove(itemState);
}
//--------------------------------------------------------==---< Object >---
/**
* Returns the the state of this instance in a human readable format.
*/
public String toString() {
StringBuilder builder = new StringBuilder();
for (Map.Entry<ItemState, Item> entry : cache.entrySet()) {
ItemState state = entry.getKey();
Item item = entry.getValue();
if (item.isNode()) {
builder.append("Node: ");
} else {
builder.append("Property: ");
}
if (item.isNew()) {
builder.append("new ");
} else if (item.isModified()) {
builder.append("modified ");
} else {
builder.append("- ");
}
String path;
try {
path = item.getPath();
} catch (RepositoryException e) {
path = "-";
}
builder.append(state + "\t" + path + " (" + item + ")\n");
}
return builder.toString();
}
}