/*
* 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.command;
import java.io.InputStream;
import org.apache.commons.io.IOUtils;
import org.apache.jackrabbit.mongomk.MongoConnection;
import org.apache.jackrabbit.mongomk.api.command.AbstractCommand;
import com.mongodb.BasicDBObject;
import com.mongodb.gridfs.GridFS;
import com.mongodb.gridfs.GridFSDBFile;
public class ReadBlobCommandMongo extends AbstractCommand<Integer> {
private final MongoConnection mongoConnection;
private final String blobId;
private final long blobOffset;
private final byte[] buffer;
private final int bufferOffset;
private final int length;
public ReadBlobCommandMongo(MongoConnection mongoConnection, String blobId, long blobOffset, byte[] buffer,
int bufferOffset, int length) {
this.mongoConnection = mongoConnection;
this.blobId = blobId;
this.blobOffset = blobOffset;
this.buffer = buffer;
this.bufferOffset = bufferOffset;
this.length = length;
}
@Override
public Integer execute() throws Exception {
return fetchBlobFromMongo();
}
// FIXME [Mete] This takes a long time, see MicroKernelIT#readBlob. See if
// it can be improved.
private int fetchBlobFromMongo() throws Exception {
GridFS gridFS = mongoConnection.getGridFS();
GridFSDBFile gridFile = gridFS.findOne(new BasicDBObject("md5", blobId));
long fileLength = gridFile.getLength();
long start = blobOffset;
long end = blobOffset + length;
if (end > fileLength) {
end = fileLength;
}
int totalBytes = -1;
if (start < end) {
InputStream is = gridFile.getInputStream();
IOUtils.skipFully(is, blobOffset);
totalBytes = is.read(buffer, bufferOffset, length);
is.close();
}
return totalBytes;
}
}