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POIs there a way to detect if an incoming serialized object stream is GZIPOutputStream compressed or a simple ObjectOutputStream?
 

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    <p>I have a legacy system where servers get slowly updated over a period of weeks. The hierarchy is such:</p> <pre><code>1 2 3 4 5 1 is the client pc 2 is a master server 3 4 and 5 are servers across the country. </code></pre> <p>Currently all of these are sending POJO (plain old java objects) back and forth in an uncompressed format. Think OjbectOutputStream() etc.</p> <p>I'd like to compress the data being serialized over the wire but do it in such a way that only data being received from a query is compressed. The data being sent down is trivial (query filter data). </p> <p>Only client #1 and master server #2 are updated right away. Servers #3, #4 and #5 could be updated weeks or months apart from each other. I need a way for the server #2 to be able to detect whether the streams coming back from #3, #4 or #5 are compressed and deal with it accordingly (as they get upgraded).</p> <p>-EDIT- The solution must be unobtrusive for the servers #3, #4, and #5. These servers do not have the concept of resending the data if an exception occurs.</p> <p>Here is an example of code used by #2 to communicate with #3, #4, or #5:</p> <pre><code> // Set the content type to be application/x-java-serialized-object connection.setRequestProperty("Content-Type", "application/x-java-serialized-object"); setupHeaderAttributes(getHttpHeaders()); setupSessionCookies(getHttpHeaders()); // Load/add httpHeaders addHeadersToConnection(connection, getHttpHeaders()); // Write the serialized object as post data objectoutputstream = new ObjectOutputStream(connection.getOutputStream()); objectoutputstream.writeObject(obj); objectoutputstream.flush(); // Get ready to receive the reply. inputstream = connection.getInputStream(); setHttpStatus(connection.getResponseCode()); </code></pre> <p>Is this possible? Thank you for your time.</p> <p>-Dennis</p>
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