Example usage for com.amazonaws.services.s3.model GetObjectRequest setMatchingETagConstraints

Introduction

In this page you can find the example usage for com.amazonaws.services.s3.model GetObjectRequest setMatchingETagConstraints.

Prototype

public void setMatchingETagConstraints(List<String> eTagList) 

Source Link

Document

Sets the optional list of ETag constraints that when present must include a match for the object's current ETag in order for this request to be executed.

Usage

From source file:com.eucalyptus.objectstorage.providers.s3.S3ProviderClient.java

License:Open Source License

@Override
public GetObjectExtendedResponseType getObjectExtended(final GetObjectExtendedType request) throws S3Exception {
    User requestUser = getRequestUser(request);
    OsgInternalS3Client internalS3Client = null;

    Boolean getMetaData = request.getGetMetaData();
    Long byteRangeStart = request.getByteRangeStart();
    Long byteRangeEnd = request.getByteRangeEnd();
    Date ifModifiedSince = request.getIfModifiedSince();
    Date ifUnmodifiedSince = request.getIfUnmodifiedSince();
    String ifMatch = request.getIfMatch();
    String ifNoneMatch = request.getIfNoneMatch();

    GetObjectRequest getRequest = new GetObjectRequest(request.getBucket(), request.getKey());
    if (byteRangeStart == null) {
        byteRangeStart = 0L;//ww  w.ja  v a 2  s.com
    }
    if (byteRangeEnd != null) {
        getRequest.setRange(byteRangeStart, byteRangeEnd);
    }
    if (getMetaData != null) {
        //Get object metadata
    }
    if (ifModifiedSince != null) {
        getRequest.setModifiedSinceConstraint(ifModifiedSince);
    }
    if (ifUnmodifiedSince != null) {
        getRequest.setUnmodifiedSinceConstraint(ifUnmodifiedSince);
    }
    if (ifMatch != null) {
        List matchList = new ArrayList();
        matchList.add(ifMatch);
        getRequest.setMatchingETagConstraints(matchList);
    }
    if (ifNoneMatch != null) {
        List nonMatchList = new ArrayList();
        nonMatchList.add(ifNoneMatch);
        getRequest.setNonmatchingETagConstraints(nonMatchList);
    }
    try {
        internalS3Client = getS3Client(requestUser);
        AmazonS3Client s3Client = internalS3Client.getS3Client();
        S3Object response = s3Client.getObject(getRequest);

        GetObjectExtendedResponseType reply = request.getReply();
        populateResponseMetadata(reply, response.getObjectMetadata());
        reply.setDataInputStream(response.getObjectContent());
        reply.setByteRangeStart(request.getByteRangeStart());
        reply.setByteRangeEnd(request.getByteRangeEnd());
        return reply;
    } catch (AmazonServiceException e) {
        LOG.debug("Error from backend", e);
        throw S3ExceptionMapper.fromAWSJavaSDK(e);
    }
}

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From source file:com.smoketurner.pipeline.application.core.AmazonS3Downloader.java

License:Apache License

/**
 * Retrieves a file from S3//w  ww  . j  a v  a 2  s.c  om
 *
 * @param record
 *            S3 event notification record to download
 * @return S3 object
 * @throws AmazonS3ConstraintException
 *             if the etag constraints weren't met
 * @throws AmazonS3ZeroSizeException
 *             if the file size of the object is zero
 */
public S3Object fetch(@Nonnull final S3EventNotificationRecord record)
        throws AmazonS3ConstraintException, AmazonS3ZeroSizeException {
    final AmazonS3Object object = converter.convert(Objects.requireNonNull(record));

    final GetObjectRequest request = new GetObjectRequest(object.getBucketName(), object.getKey());
    object.getVersionId().ifPresent(request::setVersionId);
    object.getETag().ifPresent(etag -> request.setMatchingETagConstraints(Collections.singletonList(etag)));

    LOGGER.debug("Fetching key: {}/{}", object.getBucketName(), object.getKey());

    final S3Object download;
    try {
        download = s3.getObject(request);
    } catch (AmazonServiceException e) {
        LOGGER.error("Service error while fetching object from S3", e);
        throw e;
    } catch (AmazonClientException e) {
        LOGGER.error("Client error while fetching object from S3", e);
        throw e;
    }

    if (download == null) {
        LOGGER.error("eTag from object did not match for key: {}/{}", object.getBucketName(), object.getKey());
        throw new AmazonS3ConstraintException(object.getKey());
    }

    final long contentLength = download.getObjectMetadata().getContentLength();
    if (contentLength < 1) {
        try {
            download.close();
        } catch (IOException e) {
            LOGGER.error(String.format("Failed to close S3 stream for key: %s/%s", download.getBucketName(),
                    download.getKey()), e);
        }

        LOGGER.debug("Object size is zero for key: {}/{}", download.getBucketName(), download.getKey());
        throw new AmazonS3ZeroSizeException(object.getKey());
    }

    LOGGER.debug("Streaming key ({} bytes): {}/{}", contentLength, download.getBucketName(), download.getKey());

    return download;
}

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