c3.ops.priam.aws.S3FileIterator.java Source code

Introduction

Here is the source code for c3.ops.priam.aws.S3FileIterator.java

Source

/**
 * 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 c3.ops.priam.aws;

import c3.ops.priam.backup.AbstractBackupPath;
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 org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Date;
import java.util.Iterator;
import java.util.List;

/**
 * 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();
    }
}