/*
* 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.oak.jcr.state;
import org.apache.commons.collections.map.LRUMap;
import org.apache.jackrabbit.oak.jcr.SessionContext;
import org.apache.jackrabbit.oak.jcr.SessionImpl;
import org.apache.jackrabbit.oak.jcr.configuration.RepositoryConfiguration;
import org.apache.jackrabbit.oak.jcr.state.ChangeTree.NodeDelta;
import org.apache.jackrabbit.oak.jcr.util.Path;
import org.apache.jackrabbit.oak.jcr.util.Unchecked;
import java.util.Map;
public class NodeStateProvider {
private final SessionContext<SessionImpl> sessionContext;
private final TransientSpace transientSpace;
private final Map<Path, TransientNodeState> cache;
public NodeStateProvider(SessionContext<SessionImpl> sessionContext, TransientSpace transientSpace) {
this.sessionContext = sessionContext;
this.transientSpace = transientSpace;
int cacheSize = 0;
try {
RepositoryConfiguration config =
sessionContext.getGlobalContext().getInstance(
RepositoryConfiguration.class);
cacheSize = config.getNodeStateCacheSize();
} catch (IllegalStateException ignore) {
// FIXME: Shouldn't use the context to pass around configuration
}
if (cacheSize <= 0) {
cache = null;
} else {
cache = Unchecked.cast(new LRUMap(cacheSize));
}
}
public TransientNodeState getNodeState(Path path) {
TransientNodeState state = cache == null ? null : cache.get(path);
if (state == null) {
NodeDelta delta = transientSpace.getNodeDelta(path);
if (delta == null) {
return null;
}
state = new TransientNodeState(sessionContext, delta);
if (cache != null) {
cache.put(path, state);
}
}
return state;
}
public void release(Path path) {
if (cache != null) {
cache.remove(path);
}
}
public void clear() {
if (cache != null) {
cache.clear();
}
}
//------------------------------------------< internal/private >---
TransientNodeState getNodeState(NodeDelta nodeDelta) {
Path path = nodeDelta.getPath();
TransientNodeState state = cache == null ? null : cache.get(path);
if (state == null) {
state = new TransientNodeState(sessionContext, nodeDelta);
if (cache != null) {
cache.put(path, state);
}
}
return state;
}
NodeDelta getNodeDelta(Path path) {
return transientSpace.getNodeDelta(path);
}
}