/*
* 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.mongomk.impl.action;
import org.apache.jackrabbit.mongomk.impl.MongoNodeStore;
import org.apache.jackrabbit.mongomk.impl.model.MongoCommit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;
import com.mongodb.QueryBuilder;
/**
* An action for fetching a commit. An exception is thrown if a commit with the
* revision id does not exist.
*/
public class FetchCommitAction extends BaseAction<MongoCommit> {
private static final Logger LOG = LoggerFactory.getLogger(FetchCommitAction.class);
private final long revisionId;
/**
* Constructs a new {@link FetchCommitAction}
*
* @param nodeStore Node store.
* @param revisionId Revision id.
*/
public FetchCommitAction(MongoNodeStore nodeStore, long revisionId) {
super(nodeStore);
this.revisionId = revisionId;
}
@Override
public MongoCommit execute() throws Exception {
MongoCommit commit = nodeStore.getFromCache(revisionId);
if (commit != null) {
return commit;
}
DBCollection commitCollection = nodeStore.getCommitCollection();
DBObject query = QueryBuilder.start(MongoCommit.KEY_FAILED).notEquals(Boolean.TRUE)
.and(MongoCommit.KEY_REVISION_ID).is(revisionId)
.get();
LOG.debug("Executing query: {}", query);
DBObject dbObject = commitCollection.findOne(query);
if (dbObject == null) {
throw new Exception(String.format("Commit with revision %d could not be found", revisionId));
}
commit = (MongoCommit)dbObject;
nodeStore.cache(commit);
return commit;
}
}