| /* |
| * 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.document.mongo; |
| |
| import java.util.function.Predicate; |
| |
| import com.google.common.collect.FluentIterable; |
| import com.google.common.io.Closer; |
| import com.mongodb.DBCollection; |
| import com.mongodb.DBCursor; |
| import org.apache.jackrabbit.oak.plugins.document.Collection; |
| import org.apache.jackrabbit.oak.plugins.document.Document; |
| import org.apache.jackrabbit.oak.plugins.document.NodeDocument; |
| import org.apache.jackrabbit.oak.plugins.document.cache.NodeDocumentCache; |
| import org.apache.jackrabbit.oak.plugins.document.util.CloseableIterable; |
| |
| import static com.google.common.base.Preconditions.checkState; |
| |
| public class MongoDocumentTraverser { |
| private final MongoDocumentStore mongoStore; |
| private boolean disableReadOnlyCheck; |
| |
| public MongoDocumentTraverser(MongoDocumentStore mongoStore) { |
| this.mongoStore = mongoStore; |
| } |
| |
| public <T extends Document> CloseableIterable<T> getAllDocuments(Collection<T> collection, Predicate<String> filter) { |
| if (!disableReadOnlyCheck) { |
| checkState(mongoStore.isReadOnly(), "Traverser can only be used with readOnly store"); |
| } |
| |
| DBCollection dbCollection = mongoStore.getDBCollection(collection); |
| Closer closer = Closer.create(); |
| |
| |
| DBCursor cursor = dbCollection.find(); |
| //TODO This may lead to reads being routed to secondary depending on MongoURI |
| //So caller must ensure that its safe to read from secondary |
| cursor.setReadPreference(mongoStore.getConfiguredReadPreference(collection)); |
| closer.register(cursor); |
| |
| @SuppressWarnings("Guava") |
| Iterable<T> result = FluentIterable.from(cursor) |
| .filter(o -> filter.test((String) o.get("_id"))) |
| .transform(o -> { |
| T doc = mongoStore.convertFromDBObject(collection, o); |
| //TODO Review the cache update approach where tracker has to track *all* docs |
| if (collection == Collection.NODES) { |
| NodeDocument nodeDoc = (NodeDocument) doc; |
| getNodeDocCache().put(nodeDoc); |
| } |
| return doc; |
| }); |
| return CloseableIterable.wrap(result, closer); |
| } |
| |
| /** |
| * For testing only |
| */ |
| void disableReadOnlyCheck() { |
| this.disableReadOnlyCheck = true; |
| } |
| |
| private NodeDocumentCache getNodeDocCache() { |
| return mongoStore.getNodeDocumentCache(); |
| } |
| } |