Asked 10 years, 10 months ago. Active 1 year, 9 months ago. Viewed 66k times. What is the sense of buffer size in the constructor? BufferedReader Reader in, int size As i have written the program: import java. Improve this question. Add a comment. Active Oldest Votes. Improve this answer. Chin Let me know if that's sufficient. Isn't the size the number of characters buffered instead of bytes? Logcat says: Default buffer size used in BufferedReader constructor.
It would be better to be explicit if an 8k-char buffer is required. What is the right way? Using FileInputStream, doesn't buffer size directly influence the count of system calls to read from that file? So that if you are reading a huge file line by line, then it would make sense setting bufferSize to a higher value so that it makes less system calls..
Just thinking, I can't tell from the source code, wdyt? Show 1 more comment. Straight forward and clearcut info. The buffer actually never grows.
It is of constant size. It is used just as an intermediate in-memory storage when reading from a file. I'm lazy to explain more, so look at this: stackoverflow. Although the default size of usually is enough and suits well. Sign up or log in Sign up using Google. LordDoskias LordDoskias 3, 3 3 gold badges 26 26 silver badges 42 42 bronze badges. Add a comment. Active Oldest Votes. It sounds like you're reading from a network connection TCP?
Improve this answer. Hmz, good point. Using larger buffers will reduce the number of switches between Java code and native code and may have performance impact, independent of the network packet size.
Actually if you're using IPv6 you may also run into IPv6's jumbo frames and those are up to 4gb large not that you'd use such a large frame today; though keep in mind that jumbo frames in IPv4 aren't really a standard so I'm sure you may find larger frames there as well.
So I wouldn't hardcode it if that was really something to worry. I have experimented the buffer size in Android device in local network. And 8k is the worst. Jono Jono 9 9 silver badges 12 12 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.
It is important to know that while using Spring WebClient we do not need to deal with DataBuffers directly. We may however need to change DataBuffer capacity if we expect to transfer larger amount of data in one go.
For example, downloading file as a byte[] or using Mono publisher. We can reproduce this exception by transferring a large file with our byte[] example above. Also we know that Mono is a publisher that can emit zero or 1 events. Here, we are using DataBufferUtils to subscribe to the DataBuffer contents and write them to a file as a whole. When we run this to download a bigger file we get below exception. We can avoid DataBufferLimitException by increasing its capacity.
To do that we need to configure the default codecs on the WebClient during building. Here, we are building a WebClient with specifying DataBuffer size. Using that we will be able to download files up to 2MB in one go. Remember that, increasing DataBuffer size will increase its impact on your overall memory. We should only do so when we have specific requirements. The best way to download large files using WebClient it to download the file in chunks.
To do that we need to use Flux publisher that can emit zero to N events.
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