Examples with MultipartPartETag com.emc.object.s3.bean.MultipartPartETag used on opensource projects

Example 1 with MultipartPartETag

use of com.emc.object.s3.bean.MultipartPartETag in project pravega by pravega.

the class ExtendedS3Storage method doConcat.

/**
 * The concat is implemented using extended S3 implementation of multipart copy API. Please see here for
 * more detail on multipart copy:
 * http://docs.aws.amazon.com/AmazonS3/latest/dev/CopyingObjctsUsingLLJavaMPUapi.html
 *
 * The multipart copy is an atomic operation. We schedule two parts and commit them atomically using
 * completeMultiPartUpload call. Specifically, to concatenate, we are copying the target segment T and the
 * source segment S to T, so essentially we are doing T <- T + S.
 */
private Void doConcat(SegmentHandle targetHandle, long offset, String sourceSegment) throws StreamSegmentNotExistsException {
    Preconditions.checkArgument(!targetHandle.isReadOnly(), "target handle must not be read-only.");
    long traceId = LoggerHelpers.traceEnter(log, "concat", targetHandle.getSegmentName(), offset, sourceSegment);
    SortedSet<MultipartPartETag> partEtags = new TreeSet<>();
    String targetPath = config.getRoot() + targetHandle.getSegmentName();
    String uploadId = client.initiateMultipartUpload(config.getBucket(), targetPath);
    // check whether the target exists
    if (!doExists(targetHandle.getSegmentName())) {
        throw new StreamSegmentNotExistsException(targetHandle.getSegmentName());
    }
    // check whether the source is sealed
    SegmentProperties si = doGetStreamSegmentInfo(sourceSegment);
    Preconditions.checkState(si.isSealed(), "Cannot concat segment '%s' into '%s' because it is not sealed.", sourceSegment, targetHandle.getSegmentName());
    // Copy the first part
    CopyPartRequest copyRequest = new CopyPartRequest(config.getBucket(), targetPath, config.getBucket(), targetPath, uploadId, 1).withSourceRange(Range.fromOffsetLength(0, offset));
    CopyPartResult copyResult = client.copyPart(copyRequest);
    partEtags.add(new MultipartPartETag(copyResult.getPartNumber(), copyResult.getETag()));
    // Copy the second part
    S3ObjectMetadata metadataResult = client.getObjectMetadata(config.getBucket(), config.getRoot() + sourceSegment);
    // in bytes
    long objectSize = metadataResult.getContentLength();
    copyRequest = new CopyPartRequest(config.getBucket(), config.getRoot() + sourceSegment, config.getBucket(), targetPath, uploadId, 2).withSourceRange(Range.fromOffsetLength(0, objectSize));
    copyResult = client.copyPart(copyRequest);
    partEtags.add(new MultipartPartETag(copyResult.getPartNumber(), copyResult.getETag()));
    // Close the upload
    client.completeMultipartUpload(new CompleteMultipartUploadRequest(config.getBucket(), targetPath, uploadId).withParts(partEtags));
    client.deleteObject(config.getBucket(), config.getRoot() + sourceSegment);
    LoggerHelpers.traceLeave(log, "concat", traceId);
    return null;
}