/**
* Copyright 2013 Netflix, Inc.
*
* Licensed 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 com.netflix.priam.aws;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.model.ListObjectsRequest;
import com.amazonaws.services.s3.model.ObjectListing;
import com.amazonaws.services.s3.model.S3ObjectSummary;
import com.google.common.collect.Lists;
import com.google.inject.Provider;
import com.netflix.priam.backup.AbstractBackupPath;
/**
* Iterator representing list of backup files available on S3
*/
public class S3FileIterator implements Iterator<AbstractBackupPath>
{
private static final Logger logger = LoggerFactory.getLogger(S3FileIterator.class);
private final Provider<AbstractBackupPath> pathProvider;
private final AmazonS3 s3Client;
private final Date start;
private final Date till;
private Iterator<AbstractBackupPath> iterator;
private ObjectListing objectListing;
public S3FileIterator(Provider<AbstractBackupPath> pathProvider, AmazonS3 s3Client, String path, Date start, Date till)
{
this.start = start;
this.till = till;
this.pathProvider = pathProvider;
ListObjectsRequest listReq = new ListObjectsRequest();
String[] paths = path.split(String.valueOf(S3BackupPath.PATH_SEP));
listReq.setBucketName(paths[0]);
listReq.setPrefix(pathProvider.get().remotePrefix(start, till, path));
this.s3Client = s3Client;
objectListing = s3Client.listObjects(listReq);
iterator = createIterator();
}
@Override
public boolean hasNext()
{
if (iterator.hasNext())
{
return true;
}
else
{
while(objectListing.isTruncated() && !iterator.hasNext())
{
objectListing = s3Client.listNextBatchOfObjects(objectListing);
iterator = createIterator();
}
}
return iterator.hasNext();
}
private Iterator<AbstractBackupPath> createIterator()
{
List<AbstractBackupPath> temp = Lists.newArrayList();
for (S3ObjectSummary summary : objectListing.getObjectSummaries())
{
AbstractBackupPath path = pathProvider.get();
path.parseRemote(summary.getKey());
logger.debug("New key " + summary.getKey() + " path = " + path.getRemotePath() + " " + start + " end: " + till + " my " + path.getTime() );
if ((path.getTime().after(start) && path.getTime().before(till)) || path.getTime().equals(start)){
temp.add(path);
logger.debug("Added key " + summary.getKey() );
}
}
return temp.iterator();
}
@Override
public AbstractBackupPath next()
{
return iterator.next();
}
@Override
public void remove()
{
throw new IllegalStateException();
}
}