/*
* 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.plugins.observation2;
import static org.apache.jackrabbit.JcrConstants.JCR_SYSTEM;
import static org.apache.jackrabbit.oak.plugins.observation2.ObservationConstants.EVENTS;
import static org.apache.jackrabbit.oak.plugins.observation2.ObservationConstants.LISTENERS;
import static org.apache.jackrabbit.oak.plugins.observation2.ObservationConstants.REP_OBSERVATION;
import java.util.Set;
import java.util.concurrent.atomic.AtomicLong;
import com.google.common.collect.Sets;
import org.apache.jackrabbit.oak.plugins.nodetype.ReadOnlyNodeTypeManager;
import org.apache.jackrabbit.oak.plugins.observation2.EventQueueWriter.EventRecorder;
import org.apache.jackrabbit.oak.plugins.observation2.EventQueueWriter.ListenerSpec;
import org.apache.jackrabbit.oak.spi.commit.DefaultEditor;
import org.apache.jackrabbit.oak.spi.commit.Editor;
import org.apache.jackrabbit.oak.spi.commit.EditorProvider;
import org.apache.jackrabbit.oak.spi.commit.VisibleEditor;
import org.apache.jackrabbit.oak.spi.state.ChildNodeEntry;
import org.apache.jackrabbit.oak.spi.state.NodeBuilder;
import org.apache.jackrabbit.oak.spi.state.NodeState;
/**
* TODO document
*/
public class EventQueueWriterProvider implements EditorProvider {
public static final AtomicLong BUNDLE_ID = new AtomicLong();
@Override
public Editor getRootEditor(NodeState before, NodeState after, NodeBuilder builder) {
NodeBuilder queue = getEventQueue(builder);
if (queue == null) {
return DefaultEditor.INSTANCE;
}
Iterable<ListenerSpec> listenerSpecs = getListenerSpecs(after);
if (listenerSpecs == null) {
return DefaultEditor.INSTANCE;
}
EventRecorder eventRecorder = new EventRecorder(queue, listenerSpecs);
return VisibleEditor.wrap(new EventQueueWriter(eventRecorder, "/", after));
}
private static NodeBuilder getEventQueue(NodeBuilder builder) {
if (builder.hasChildNode(JCR_SYSTEM)) {
builder = builder.child(JCR_SYSTEM);
if (builder.hasChildNode(REP_OBSERVATION)) {
builder = builder.child(REP_OBSERVATION);
return builder.child(EVENTS).child(String.valueOf(BUNDLE_ID.getAndIncrement()));
}
}
return null;
}
private static Iterable<ListenerSpec> getListenerSpecs(NodeState after) {
NodeState listeners = after.getChildNode(JCR_SYSTEM)
.getChildNode(REP_OBSERVATION)
.getChildNode(LISTENERS);
ReadOnlyNodeTypeManager ntMgr = ReadOnlyNodeTypeManager.getInstance(after);
Set<ListenerSpec> specs = Sets.newHashSet();
for (ChildNodeEntry listener : listeners.getChildNodeEntries()) {
ListenerSpec spec = ListenerSpec.create(ntMgr, listener.getName(), listener.getNodeState());
if (spec != null) {
specs.add(spec);
}
}
return specs.isEmpty() ? null : specs;
}
}