Re: [basex-talk] Feature request

Hi Johan,

I haven't come across this exception before. Maybe you can find out which value is bound to the LOCATION variable in your environment [1]?

Thanks in advance, Christian

[1] https://github.com/BaseXdb/basex/blob/master/basex-core/src/main/java/org/ba...

On Mon, Jan 26, 2015 at 4:17 PM, Johan Mörén johan.moren@gmail.com wrote:

We run the script that uses this functionality embedded in a java application. I noticed now that the first time the code runs after a cold start. This log message appears.

java.nio.file.FileSystemNotFoundException: Provider "wrap" not installed at java.nio.file.Paths.get(Paths.java:147) at org.basex.util.Prop.homePath(Prop.java:142) at org.basex.util.Prop.<clinit>(Prop.java:96) at org.basex.core.StaticOptions.<clinit>(StaticOptions.java:20) at org.basex.core.Context.<init>(Context.java:77) at org.basex.core.Context.<init>(Context.java:69) at se.kb.mimer.util.xquery.XQueryClient.extractPackageFilesData(XQueryClient.java:16) ....

The script still produces the expected output. I guess that this is a handled exception inside BaseX that get printed out to the log with INFO level. Am i right?

Regards, Johan

On Mon Jan 26 2015 at 2:24:41 PM Christian Grün christian.gruen@gmail.com wrote:

...

Hi Johan,

...

Just wanted to report back that it works really well.

Glad to hear it works.

...

It is about 50% slower than running the md5 command on the command line of my mac.

My final solution is close to the one you proposed [1]: I decided to use a little buffer as well, because it was faster than calling md.update() for each single byte.

Using nio channels gives us better performance:

String path = ...
RandomAccessFile raf = new RandomAccessFile(path, "r");
FileChannel ch = raf.getChannel();
ByteBuffer buf = ByteBuffer.allocate(IO.BLOCKSIZE);
final MessageDigest md = MessageDigest.getInstance("md5");
do {
  final int n = ch.read(buf);
  if(n == -1) break;
  md.update(buf.array(), 0, n);
  buf.flip();
} while(true);
System.out.println(Token.string(Token.hex(md.digest(), true)));

But I am not sure how smoothly this would integrate in our remaining streaming architecture, as we are also streaming main-memory objects. I'll keep it in mind, though.

Cheers, Christian

[1] https://github.com/BaseXdb/basex/blob/master/basex-core/src/main/java/org/ba...