Streams - what is it
So I have been using Streams. But, recently when I started thinking about it I really got confused as to what really streams are. I looked it up online but couldn't find my question answered. I really got confused, when we got the requirement of creating a file from HttpServletRequest.getInputStream() for certain conditions. Problem was that we already hit EOF on that stream by the time we are done reading that "condition" that tells us to write InputStream to a file. So we decided to use mark()/reset() and that's what is currently being used. That led me to thinking that probably Java is caching the data and it really is not true re-reading, but reading from cache when reset is called; If that's true then this defeats the purpose because this will just increase the size of JVM significantly.
Thinking about the above problem I got basic questions that I couldn't find it online:
1. What exactly are streams? Is Stream something on network or is it something that's part of the JVM that's trying to read the InputStream? I want to be sure of what the affect on JVM size is.
2. When I call mark/reset does it get cached inside the JVM or does it read from the stream again. Here when I say read from stream again, I am really thinking that stream is somwhere outside of JVM.
That led me to thinking that probably Java is caching the dataNo. The stream is caching the data. In this case the stream returned by HttpServletRequest.getInputStream(). The documentation for mark()/reset() makes it clear that not all streams can do that.
If that's true then this defeats the purpose because this will just increase the size of JVM significantly.Only if the specific stream supports mark() and reset(), and only within the marklimit you specified when you called mark().
1. What exactly are streams?An API for doing input and output.
Is Stream something on network or is it something that's part of the JVM that's trying to read the InputStream?It's an object in the JVM.
I want to be sure of what the affect on JVM size is.The effect is a cost of up to 'marklimit' bytes.
2. When I call mark/reset does it get cached inside the JVM or does it read from the stream again.It is cached inside the object.
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