A scenario, need to consume a rest webservice which provides a huge file as a stream output and vice versa need to handle the stream and directly write to a file rather memory. Service :
@RequestMapping(value = "downloadFile", method = RequestMethod.GET)
public StreamingResponseBody getSteamingFile(HttpServletResponse response) throws IOException {
response.setContentType("application/octet-stream");
InputStream inputStream = new FileInputStream(new File("data\\test_big.txt"));
return outputStream -> {
int nRead;
byte[] data = new byte[1024];
System.out.println("Writing some bytes..");
while ((nRead = inputStream.read(data, 0, data.length)) != -1) {
outputStream.write(data, 0, nRead);
}
System.out.println("Completed #####");
outputStream.flush();
outputStream.close();
response.flushBuffer();
};
}
Consumer Route:
.to("http4://localhost:8080/downloadFile")
.process(new Processor() {
public void process(Exchange exchange) throws Exception {
InputStream is = exchange.getIn().getBody(InputStream.class);
File ret = File.createTempFile("loadTest", "tmp");
FileOutputStream fos = new FileOutputStream(ret);
StreamUtils.copy(is, fos);
System.out.println("File Name "+ ret.getName());
is.close();
fos.flush();
fos.close();
}
});
256 JVM is going out of Memory when processing 300 MB which treats my route is not performing streaming to file.
