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POWrite files from multiple rest requests
 

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  1. POWrite files from multiple rest requests
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    <p>I have a rest service written to receive a file and save it.</p> <p>The problem is that when I receive more than 2 requests, the files are not written only the last request is taken into consideration and written.</p> <p>Here is my code:</p> <pre><code>@POST @RequestMapping(value = "/media/{mediaName}/{mediaType}") @Produces(MediaType.APPLICATION_OCTET_STREAM) @ResponseBody public String updateResourceLocally(@FormDataParam("rawData") InputStream rawData, @PathVariable("mediaName") String mediaName, @PathVariable("mediaType") String mediaType) { logger.info("Entering updateResourceLocally for " + jobId + "; for media type: " + mediaType); final String storeDir = "/tmp/test/" + mediaName + ("/"); final String finalExtension = mediaType; final InputStream finalRawData = rawData; // new Thread(new Runnable() { // public void run() { // writeToFile(finalRawData, storeDir, finalExtension); // } // }).start(); writeToFile(finalRawData, storeDir, finalExtension); // int poolSize = 100; // ExecutorService executor = Executors.newFixedThreadPool(poolSize); // executor.execute(new Runnable() { // @Override // public void run() { // writeToFile(rawData, storeDir, finalExtension); // } // }); logger.info("File uploaded to : " + storeDir); return "Success 200"; } </code></pre> <p>I tried to put the writeToFile into threads, but still no success. Here is what writeToFile does</p> <pre><code>public synchronized void writeToFile(InputStream rawData, String uploadedFileLocation, String extension) { StringBuilder finalFileName = null; String currentIncrement = ""; String fileName = "raw"; try { File file = new File(uploadedFileLocation); if (!file.exists()) { file.mkdirs(); } while (true) { finalFileName = new StringBuilder(fileName); if (!currentIncrement.equals("")) { finalFileName.append("_").append(currentIncrement).append(extension); } File f = new File(uploadedFileLocation + finalFileName); if (f.exists()) { if (currentIncrement.equals("")) { currentIncrement = "1"; } else { currentIncrement = (Integer.parseInt(currentIncrement) + 1) + ""; } } else { break; } } int read = 0; byte[] bytes = new byte[1024]; OutputStream out = new FileOutputStream(new File(uploadedFileLocation + finalFileName)); while ((read = rawData.read(bytes)) != -1) { out.write(bytes, 0, read); } out.flush(); out.close(); } catch (IOException e) { throw new RuntimeException(e.getMessage()); } } </code></pre> <p>The writeToFile creates a folder and writes a file, if the file already exists, it appends 1 and then increments the 1 accordingly and writes the file, so I would get raw.zip, raw-1.zip, etc.</p> <p>I think the inputstream bytes are being lost, am I correct in my assumption?</p> <p>NOTE: I do not have a UI client, I am using Poster a Firefox extension.</p> <p>Update: What I am trying to achieve here is very simple</p> <ol> <li>I receive number of requests with files attached</li> <li>I need to save them. If the mediaName and mediaType are the same, then I need to append something to the filename and save it in the same location</li> <li>If they are different I do not have a problem</li> </ol> <p>The problem I am facing with the current code is that, when I post multiple time to the same URL, I have file-names created according to what I want, but the file content is not right, they vary depending on when the request came in and only the last POST's request is written properly.</p> <p>Eg. I have a zip file of size 250MB, when I post 5 time, the 1st four will have random sizes and the 5th will have the complete 250MB, but the previous four should also have the same content.</p>
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    1. USVivek
    1. USVivek
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    1. COWhy do your writeToFile function is *synchronized* ?
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      1. USStephane Lallemagne
    2. COAnd what do you want to do ? Can parallel requests write into the same file, or each request writes into a different file ?
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      1. USStephane Lallemagne
    3. CO1. Synchronized was when I was trying out multiple options, just creped into the post 2. The parallel requests are not writing into the same file, if the file already exists a new file is created with -'whatevernumber'
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      1. USVivek
 

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