Earlier, I asked a question https://stackguides.com/questions/35581090/can-i-use-resumable-upload-for-gae-blobstore-api about resumable uploading with Blobstire API. For myself, I decided that it is impossible to implement resumable uploading with Blobstire API. In this case i am trying to implement Google Cloud Storage with Java Client Library. At the moment I made the download my video file to bucket and serve video. My servlet look like in google example
@Override
public void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException {
GcsOutputChannel outputChannel =
gcsService.createOrReplace(getFileName(req), GcsFileOptions.getDefaultInstance());
copy(req.getInputStream(), Channels.newOutputStream(outputChannel));
}
private GcsFilename getFileName(HttpServletRequest req) {
String[] splits = req.getRequestURI().split("/", 4);
if (!splits[0].equals("") || !splits[1].equals("gcs")) {
throw new IllegalArgumentException("The URL is not formed as expected. " +
"Expecting /gcs/<bucket>/<object>");
}
return new GcsFilename(splits[2], splits[3]);
}
private void copy(InputStream input, OutputStream output) throws IOException {
try {
byte[] buffer = new byte[BUFFER_SIZE];
int bytesRead = input.read(buffer);
while (bytesRead != -1) {
output.write(buffer, 0, bytesRead);
bytesRead = input.read(buffer);
}
} finally {
input.close();
output.close();
}
}
Now I need to implement
- resumable upload (due to poor internet on mobile devices)
- uploading by chunck (due to limitation in size of one request with 32mb)
I realized, that serverside of resumable upload should be organized manually and my backend should be able to give me range of uploaded chunck and allow to continue booting in to OutputChannel.
The documentation for the GcsOutputChannel says:
This class is serializable, this allows for writing part of a file, serializing the GcsOutputChannel deserializing it, and continuing to write to the same file. The time for which a serialized instance is valid is limited and determined by the Google Cloud Storage service
I have not enough experience, so the question may be stupid: Please somebody tell me how to serialize my GcsOutputChannel? I do not understand where I can save the file containing the serialized object.
By the way, can anyone knows how long Google Cloud Storage service store that serialized object?
