Most efficient way to create InputStream from OutputStream

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If you don’t want to copy all of the data into an in-memory buffer all at once then you’re going to have to have your code that uses the OutputStream (the producer) and the code that uses the InputStream (the consumer) either alternate in the same thread, or operate concurrently in two separate threads. Having them operate in the same thread is probably much more complicated that using two separate threads, is much more error prone (you’ll need to make sure that the consumer never blocks waiting for input, or you’ll effectively deadlock) and would necessitate having the producer and consumer running in the same loop which seems way too tightly coupled.

So use a second thread. It really isn’t that complicated. The page you linked to had reasonable example. Here’s a somewhat modernized version, which also closes the streams:

try (PipedInputStream in = new PipedInputStream()) {
    new Thread(() -> {
        try (PipedOutputStream out = new PipedOutputStream(in)) {
            writeDataToOutputStream(out);
        } catch (IOException iox) {
            // handle IOExceptions
        }
    }).start();
    processDataFromInputStream(in);
}

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